<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572013000400013</article-id>
<article-id pub-id-type="doi">10.7705/biomedica.v33i4.1489</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Asociación y efectos de interacción en los genes AGT , AGTR1 , ACE , ADRB2 , DRD1 , ADD1, ADD2, ATP2B1, TBXA2R y PTGS2 sobre la hipertensión en la población antioqueña]]></article-title>
<article-title xml:lang="en"><![CDATA[Association and interaction of AGT, AGTR1, ACE, ADRB2, DRD1, ADD1, ADD2, ATP2B1, TBXA2R and PTGS2 genes on the risk of hypertension in Antioquian population]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia]]></surname>
<given-names><![CDATA[Diana María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Naranjo]]></surname>
<given-names><![CDATA[Carlos Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parra]]></surname>
<given-names><![CDATA[María Victoria]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Caro]]></surname>
<given-names><![CDATA[María Antonieta]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia]]></surname>
<given-names><![CDATA[Ana Victoria]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jaramillo]]></surname>
<given-names><![CDATA[Carlos José]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bedoya]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Grupo de Genética Molecular ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Hospital Universitario San Vicente de Paúl ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2013</year>
</pub-date>
<volume>33</volume>
<numero>4</numero>
<fpage>598</fpage>
<lpage>614</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572013000400013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572013000400013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572013000400013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción. La hipertensión arterial es una enfermedad multifactorial influenciada por componentes genéticos y ambientales, cuya prevalencia varía entre grupos étnicos. Se han llevado a cabo numerosos estudios en genes de sistemas reguladores de la presión arterial, como el sistema renina-angiotensinaaldosterona, el sistema nervioso simpático, los factores endoteliales, y el balance de sodio, mostrando resultados incongruentes entre poblaciones. Objetivos. Evaluar el efecto de variantes en los genes AGT , AGTR1 , ACE , ADRB2 , DRD1 , ADD1 , ADD2 , ATP2B1 , TBXA2R y PTGS2 y del componente ancestral individual, sobre la hipertensión arterial y las cifras de presión arterial en una muestra de población antioqueña. Materiales y métodos. Se genotipificaron 107 casos y 253 controles para 12 variantes en los genes AGT , AGTR1 , ACE , ADRB2 , DRD1 , ADD1 , ADD2 , ATP2B1 , TBXA2R y PTGS2 , y para 20 marcadores informativos de ascendencia. Se evaluó la asociación de los polimorfismos y sus interacciones, y de la composición genética ancestral con hipertensión y cifras de presión arterial. Resultados. Los genes ADD2 , rs4852706 (OR=3,0; p=0,023); DRD1 , rs686 (OR=0,38; p=0,012) y ADRB2 , rs1042718 (OR=10,0; p=0,008); y combinaciones genotípicas de DRD1 con AGTR1 ; de AGT con ADD1 ; y de ADD1 con ATP2B1 y PTGS2 , se asociaron con hipertensión arterial. El componente ancestral amerindio se asoció con disminución en la presión arterial diastólica. Conclusiones. Variantes en los genes ADD2 , DRD1 , ADRB2 , AGTR1 , AGT , ADD1 , ATP2B1 y PTGS2 , individualmente o en su interacción, se encuentran asociadas con hipertensión. El componente ancestral amerindio tiene un efecto sobre las cifras de presión arterial.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction: Hypertension is a multifactorial disease influenced by genetic and environmental components, with its prevalence varying across ethnic groups. Manifold studies on blood pressure regulatory system genes have been carried out -such as the renin-angiotensin-aldosterone system, the sympathetic nervous system, endothelial factor, and sodium balance-, but the results yielded were inconsistent among populations. Objectives: To evaluate the effect of both variants in genes AGT, AGTR1, ACE, ADRB2, DRD1, ADD1, ADD2, ATP2B1, TBXA2R PTGS2, and the result of the individual ancestry component on hypertension and blood pressure levels among population in Antioquia. Methods and materials: 107 cases and 253 controls were genotyped for 12 variants on genes AGT, AGTR1, ACE, ADRB2, DRD1, ADD1, ADD2, ATP2B1, TBXA2R y PTGS2, and for 20 ancestry informative markers. The association of polymorphisms and their interactions, and the association of ancestral genetic composition with hypertension and blood pressure levels were examined. Results: Genes ADD2, rs4852706 (OR=3.0; p=0.023); DRD1, rs686 (OR=0.38; p=0.012) and ADRB2, rs1042718 (OR=10.0; p=0.008); as well as genotypic combinations of DRD1 and AGTR1; AGT and ADD1; and ADD1 to ATP2B1 and PTGS2 were associated to hypertension. The Amerindian ancestry component was associated to some decrease in diastolic blood pressure. Conclusion: Variants on genes ADD2, DRD1, ADRB2, AGTR1, AGT, ADD1, ATP2B1 and PTGS2 individually or interacting, are associated to hypertension. The Amerindian ancestry component has an effect on blood pressure.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hipertensión]]></kwd>
<kwd lng="es"><![CDATA[epístasis genética]]></kwd>
<kwd lng="es"><![CDATA[herencia multifactorial]]></kwd>
<kwd lng="es"><![CDATA[estudios de asociación genética]]></kwd>
<kwd lng="es"><![CDATA[genotipo]]></kwd>
<kwd lng="es"><![CDATA[polimorfismo de nucleótido simple]]></kwd>
<kwd lng="en"><![CDATA[Hypertension]]></kwd>
<kwd lng="en"><![CDATA[epistasis]]></kwd>
<kwd lng="en"><![CDATA[genetic]]></kwd>
<kwd lng="en"><![CDATA[multifactorial inheritance]]></kwd>
<kwd lng="en"><![CDATA[genetic association studies]]></kwd>
<kwd lng="en"><![CDATA[genotype]]></kwd>
<kwd lng="en"><![CDATA[polymorphism, single nucleotide]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p>doi: <a href="http://dx.doi.org/10.7705/biomedica.v33i4.1489" target="_blank">http://dx.doi.org/10.7705/biomedica.v33i4.1489</a> </p>     <p>ART&Iacute;CULO ORIGINAL</p>     <p><font size="4">    <center><b>Asociaci&oacute;n y efectos de interacci&oacute;n en los genes <i>AGT </i>, <i>AGTR1 </i>, <i>ACE </i>, <i>ADRB2 </i>, <i>DRD1 </i>, <i>ADD1</i>, <i>ADD2</i>, <i>ATP2B1</i>, <i>TBXA2R </i>y <i>PTGS2 </i>sobre la hipertensi&oacute;n en la poblaci&oacute;n antioque&ntilde;a </b></center></font></p>     <p>    <center>Diana Mar&iacute;a Valencia <sup>1</sup>, Carlos Andr&eacute;s Naranjo <sup>1</sup>, Mar&iacute;a Victoria Parra <sup>1</sup>, Mar&iacute;a Antonieta Caro <sup>1</sup>, Ana Victoria Valencia <sup>1</sup>, Carlos Jos&eacute; Jaramillo <sup>2</sup>, Gabriel Bedoya <sup>1</sup></center></p>     <p><sup>1</sup> Grupo de Gen&eacute;tica Molecular, Universidad de Antioquia, Medell&iacute;n, Colombia </p>     <p><sup>2</sup> Hospital Universitario San Vicente de Pa&uacute;l, Universidad de Antioquia, Medell&iacute;n, Colombia </p>     <p>El trabajo se llev&oacute; a cabo en el Laboratorio de Gen&eacute;tica Molecular de la Universidad de Antioquia.</p>      ]]></body>
<body><![CDATA[<p><b>Contribuci&oacute;n de los autores: </b></p>     <p>Diana Mar&iacute;a Valencia, Carlos Andr&eacute;s Naranjo y Mar&iacute;a Antonieta Caro obtuvieron los pacientes y realizaron la genotipificaci&oacute;n.</p>      <p>Diana Mar&iacute;a Valencia, Mar&iacute;a Victoria Parra, Ana Victoria Valencia, Carlos Jos&eacute; Jaramillo y Gabriel Bedoya analizaron los resultados y elaboraron el manuscrito.</p>      <p>Carlos Jos&eacute; Jaramillo y Gabriel Bedoya gestionaron la financiaci&oacute;n.</p>      <p>Recibido: 05/12/12; aceptado:16/06/13 </p> <hr size="1">     <p><b>Introducci&oacute;n. </b>La hipertensi&oacute;n arterial es una enfermedad multifactorial influenciada por componentes gen&eacute;ticos y ambientales, cuya prevalencia var&iacute;a entre grupos &eacute;tnicos. Se han llevado a cabo numerosos estudios en genes de sistemas reguladores de la presi&oacute;n arterial, como el sistema renina-angiotensinaaldosterona, el sistema nervioso simp&aacute;tico, los factores endoteliales, y el balance de sodio, mostrando resultados incongruentes entre poblaciones.</p>     <p><b>Objetivos. </b>Evaluar el efecto de variantes en los genes <i>AGT </i>, <i>AGTR1 </i>, <i>ACE </i>, <i>ADRB2 </i>, <i>DRD1 </i>, <i>ADD1 </i>, <i>ADD2 </i>, <i>ATP2B1 </i>, <i>TBXA2R </i>y <i>PTGS2 </i>y del componente ancestral individual, sobre la hipertensi&oacute;n arterial y las cifras de presi&oacute;n arterial en una muestra de poblaci&oacute;n antioque&ntilde;a.</p>     <p><b>Materiales y m&eacute;todos. </b>Se genotipificaron 107 casos y 253 controles para 12 variantes en los genes <font size="2" face="verdana"><i>AGT </i>, <i>AGTR1 </i>, <i>ACE </i>, <i>ADRB2 </i>, <i>DRD1 </i>, <i>ADD1 </i>, <i>ADD2 </i>, <i>ATP2B1 </i>, <i>TBXA2R </i>y <i>PTGS2 </i>, y para 20 marcadores informativos de ascendencia. </font>Se evalu&oacute; la asociaci&oacute;n de los polimorfismos y sus interacciones, y de la composici&oacute;n gen&eacute;tica ancestral con hipertensi&oacute;n y cifras de presi&oacute;n arterial.</p> </font><font face="verdana" size="2">     <p><b>Resultados. </b>Los genes <i>ADD2 </i>, rs4852706 (OR=3,0; p=0,023); <i>DRD1 </i>, rs686 (OR=0,38; p=0,012) y <i>ADRB2 </i>, rs1042718 (OR=10,0; p=0,008); y combinaciones genot&iacute;picas de <i>DRD1 </i>con <i>AGTR1 </i>; de <i>AGT </i>con <i>ADD1 </i>; y de <i>ADD1 </i>con <i>ATP2B1 </i>y <i>PTGS2 </i>, se asociaron con hipertensi&oacute;n arterial. El componente ancestral amerindio se asoci&oacute; con disminuci&oacute;n en la presi&oacute;n arterial diast&oacute;lica.</p>     <p><b>Conclusiones. </b>Variantes en los genes <i>ADD2 </i>, <i>DRD1 </i>, <i>ADRB2 </i>, <i>AGTR1 </i>, <i>AGT </i>, <i>ADD1 </i>, <i>ATP2B1 </i>y <i>PTGS2 </i>, individualmente o en su interacci&oacute;n, se encuentran asociadas con hipertensi&oacute;n. El componente ancestral amerindio tiene un efecto sobre las cifras de presi&oacute;n arterial.</p>     ]]></body>
<body><![CDATA[<p><b>Palabras clave: </b>hipertensi&oacute;n, ep&iacute;stasis gen&eacute;tica, herencia multifactorial, estudios de asociaci&oacute;n gen&eacute;tica, genotipo, polimorfismo de nucle&oacute;tido simple.</p>     <p>doi: <a href="http://dx.doi.org/10.7705/biomedica.v33i4.1489" target="_blank">http://dx.doi.org/10.7705/biomedica.v33i4.1489</a></p> <hr size="1">     <p><font size="3"><b>Association and interaction of </b><b><i>AGT, AGTR1, ACE, ADRB2, DRD1, ADD1, ADD2, ATP2B1, TBXA2R </i></b><b>and </b><b><i>PTGS2 </i></b><b>genes on the risk of hypertension in Antioquian population </b></font></p>     <p><b>Introduction: </b>Hypertension is a multifactorial disease influenced by genetic and environmental components, with its prevalence varying across ethnic groups. Manifold studies on blood pressure regulatory system genes have been carried out —such as the renin-angiotensin-aldosterone system, the sympathetic nervous system, endothelial factor, and sodium balance—, but the results yielded were inconsistent among populations.</p>     <p><b>Objectives: </b>To evaluate the effect of both variants in genes AGT, AGTR1, ACE, ADRB2, DRD1, ADD1, ADD2, ATP2B1, TBXA2R PTGS2, and the result of the individual ancestry component on hypertension and blood pressure levels among population in Antioquia.</p>     <p><b>Methods and materials: </b>107 cases and 253 controls were genotyped for 12 variants on genes AGT, AGTR1, ACE, ADRB2, DRD1, ADD1, ADD2, ATP2B1, TBXA2R y PTGS2, and for 20 ancestry informative markers. The association of polymorphisms and their interactions, and the association of ancestral genetic composition with hypertension and blood pressure levels were examined.</p>     <p><b>Results: </b>Genes ADD2, rs4852706 (OR=3.0; p=0.023); DRD1, rs686 (OR=0.38; p=0.012) and ADRB2, rs1042718 (OR=10.0; p=0.008); as well as genotypic combinations of DRD1 and AGTR1; AGT and ADD1; and ADD1 to ATP2B1 and PTGS2 were associated to hypertension. The Amerindian ancestry component was associated to some decrease in diastolic blood pressure.</p>     <p><b>Conclusion: </b>Variants on genes ADD2, DRD1, ADRB2, AGTR1, AGT, ADD1, ATP2B1 and PTGS2 individually or interacting, are associated to hypertension. The Amerindian ancestry component has an effect on blood pressure.</p>     <p><b>Key words: </b>Hypertension; epistasis, genetic; multifactorial inheritance, genetic association studies, genotype; polymorphism, single nucleotide.</p>     <p>doi: <a href="http://dx.doi.org/10.7705/biomedica.v33i4.1489" target="_blank">http://dx.doi.org/10.7705/biomedica.v33i4.1489 </a></p> <hr size="1">     ]]></body>
<body><![CDATA[<p>La hipertensi&oacute;n arterial es un importante problema de salud p&uacute;blica a nivel mundial debido a su alta prevalencia y a su impacto sobre el riesgo cardiovascular (1-3). Se estima que el 25 % de la poblaci&oacute;n adulta en el mundo presenta hipertensi&oacute;n arterial (4,5), aunque esta cifra var&iacute;a entre las diferentes poblaciones continentales. En Estados Unidos se calcula que uno de cada tres adultos la padece, siendo mayor la prevalencia y seriedad de su presentaci&oacute;n en afroamericanos y, menor, en poblaciones hispanas (5-8). Asimismo, se ha reportado que su prevalencia es menor en las poblaciones amerindias (9-11). La mayor propensi&oacute;n a desarrollar hipertensi&oacute;n en afroamericanos se ha explicado por la presencia de variantes gen&eacute;ticas ancestrales que influencian la retenci&oacute;n de sal y agua, y el tono arterial, las cuales tienen una mayor frecuencia en la poblaci&oacute;n ancestral africana que en otras. As&iacute;, la hipertensi&oacute;n ser&iacute;a el resultado de las condiciones ambientales modernas interactuando con la propensi&oacute;n gen&eacute;tica ancestral (12).</p>     <p>La influencia del componente gen&eacute;tico sobre los niveles de presi&oacute;n arterial se ha documentado en estudios en gemelos, estudios de adopci&oacute;n y estudios en familias (13), en los cuales se ha podido observar una mayor concordancia en los valores de presi&oacute;n arterial entre gemelos monocigotos que entre dicigotos, as&iacute; como una mayor similitud de esta dentro de las familias que entre ellas (14,15). La herencia de los niveles de presi&oacute;n arterial se ha estimado en 30 a 60 % (13).</p>     <p>Entre 5 y 10 % de los casos de hipertensi&oacute;n arterial presentan formas monog&eacute;nicas de trastornos que conllevan a una hipertensi&oacute;n secundaria, como son la enfermedad renal o suprarrenal (16), y condiciones que afectan las arterias, el coraz&oacute;n o el sistema endocrino. Adem&aacute;s, puede ocurrir durante el embarazo o ser inducida por f&aacute;rmacos (16-18). Sin embargo, para la forma com&uacute;n de la enfermedad, conocida como hipertensi&oacute;n arterial esencial, presente en 90 a 95 % de los casos, no se tiene claridad de los mecanismos gen&eacute;ticos involucrados en su desarrollo (17).</p>     <p>Actualmente se sabe que su causa etiol&oacute;gica es multifactorial, que resulta del efecto e interacci&oacute;n de m&uacute;ltiples genes que intervienen en la regulaci&oacute;n de la presi&oacute;n arterial y de factores de riesgo ambientales, entre los que se encuentran la obesidad (19, 20), el consumo de sal (21,22), el sedentarismo(23), el estr&eacute;s (24), la edad, el sexo y la composici&oacute;n gen&eacute;tica ancestral (12,25,26). Los principales sistemas fisiol&oacute;gicos que se encuentran involucrados en el control de la presi&oacute;n arterial son el sistema renina-angiotensina-aldosterona, el endotelio vascular, la transducci&oacute;n de se&ntilde;ales por v&iacute;a del sistema nervioso y las prote&iacute;nas del citoesqueleto, que se encargan del mantenimiento del flujo sangu&iacute;neo (presi&oacute;n sangu&iacute;nea y volumen de fluidos extracelulares en el cuerpo), mediaci&oacute;n de reacciones de vasodilataci&oacute;n-vasoconstricci&oacute;n y la regulaci&oacute;n de la concentraci&oacute;n de sales (27-44).</p>     <p>Se han llevado a cabo numerosos estudios gen&eacute;ticos sobre estos sistemas; sin embargo, los resultados han sido incongruentes entre poblaciones, lo que evidencia la heterogeneidad de la hipertensi&oacute;n arterial en su etiolog&iacute;a gen&eacute;tica en las poblaciones continentales (45-58).</p>     <p>Las poblaciones latinoamericanas, como la colombiana, son el resultado de la mezcla reciente entre tres poblaciones: europea, nativa americana y africana (59,60) en diferentes porcentajes de acuerdo con la regi&oacute;n. Esto hace que, en estudios de casos y controles, se pueda presentar estratificaci&oacute;n entre los grupos, lo que puede generar resultados err&oacute;neos de asociaci&oacute;n; por lo tanto, para los estudios de asociaci&oacute;n en genes candidatos en poblaciones mezcladas, es necesario el uso de marcadores gen&eacute;ticos informativos de ascendencia (61-63) que permitan calcular la composici&oacute;n ancestral individual, y hacer uso de esta en la correcci&oacute;n de los an&aacute;lisis de asociaci&oacute;n.</p>     <p>Este trabajo se hizo con el fin de evaluar el efecto independiente de alelos y genotipos en variantes en los genes de angiotensin&oacute;geno ( <i>AGT </i>), receptor de angiotensina II de tipo 1 ( <i>AGTR1 </i>), enzima convertidora de angiotensina ( <i>ACE </i>), receptor ß 2 adren&eacute;rgico ( <i>ADRB2 </i>), receptor de dopamina de tipo 1 ( <i>DRD1 </i>), aduccinas a y ß ( <i>ADD1, ADD2 </i>), ATPasa de Ca2+ de membrana plasm&aacute;tica 1 ( <i>ATP2B1 </i>), receptor de tromboxano A2 ( <i>TBXA2R </i>) y sintasa de prostaglandina 2 ( <i>PTGS2 </i>); adem&aacute;s del efecto de la interacci&oacute;n entre los polimorfismos sobre los niveles de presi&oacute;n arterial y la propensi&oacute;n a hipertensi&oacute;n arterial en una muestra de poblaci&oacute;n antioque&ntilde;a, incluyendo en los modelos, adem&aacute;s de los factores de riesgo tradicionales, la composici&oacute;n gen&eacute;tica ancestral individual como un factor que puede modificar estas asociaciones.</p>     <p><b>Materiales y m&eacute;todos </b></p>     <p><b><i>Poblaci&oacute;n de estudio </i></b></p>     <p>Para el estudio se recolect&oacute; una muestra total de 360 individuos residentes en el municipio de Medell&iacute;n, Antioquia, de los cuales, 107 fueron individuos con diagn&oacute;stico de hipertensi&oacute;n arterial esencial, seg&uacute;n los criterios establecidos por la <i>American Heart Association </i>(64), y 253 fueron personas sin antecedentes personales de hipertensi&oacute;n. Tanto los casos como los controles fueron captados en grupos de recreaci&oacute;n del adulto mayor de la Alcald&iacute;a de Medell&iacute;n en las diferentes comunas de la ciudad, empleados de la IPS Universidad de Antioquia y del Museo Universitario de la Universidad de Antioquia.</p>     ]]></body>
<body><![CDATA[<p>Los grupos fueron conformados por personas de ambos sexos mayores de 18 a&ntilde;os, residentes en Medell&iacute;n. Se excluyeron quienes tuvieran diagn&oacute;stico de hipertensi&oacute;n arterial secundaria. A todos los participantes se les hizo una encuesta general que incluy&oacute; informaci&oacute;n sociodemogr&aacute;fica (sexo, edad, estrato socioecon&oacute;mico), antropom&eacute;trica (peso, talla, &iacute;ndice de masa corporal), cl&iacute;nica (consumo de f&aacute;rmacos, enfermedades actuales, antecedentes personales y familiares de enfermedades) y del estilo de vida relevantes a la enfermedad (frecuencia de ejercicio f&iacute;sico); adem&aacute;s, se aplic&oacute; una encuesta de origen en la cual se especific&oacute; para cada participante el origen de padres, abuelos y bisabuelos.</p>     <p><b><i>Mediciones antropom&eacute;tricas y de presi&oacute;n arterial </i></b></p>     <p>El peso en kilogramos fue determinado con una balanza, con la menor cantidad de ropa posible y sin calzado. La talla, en cent&iacute;metros, se estableci&oacute; usando el tall&iacute;metro. Con los datos de peso y talla se calcul&oacute; el &iacute;ndice de masa corporal (IMC): peso (kg)/talla (m 2 ).</p>     <p>A cada persona se le tomaron tres medidas de tensi&oacute;n arterial en d&iacute;as diferentes. La tensi&oacute;n arterial se midi&oacute; con un esfigmoman&oacute;metro de mercurio calibrado, teniendo en cuenta los siguientes criterios, seg&uacute;n las gu&iacute;as de la <i>American Heart </i><i>Association </i>(64): m&iacute;nimo cinco minutos de reposo antes de tomar la medici&oacute;n; sentado, brazo derecho descubierto y apoyado al nivel del coraz&oacute;n, no haber ingerido bebidas con contenido de cafe&iacute;na, ni haber fumado treinta minutos antes de la toma de presi&oacute;n arterial, no haber hecho ejercicio antes del examen, estar lo m&aacute;s relajado posible y haber evacuado la vejiga antes del procedimiento.</p>     <p><b><i>Muestras biol&oacute;gicas y genotipificaci&oacute;n </i></b></p>     <p>Para las pruebas gen&eacute;ticas, se tom&oacute; una muestra de sangre perif&eacute;rica. El ADN gen&oacute;mico se extrajo de leucocitos por el m&eacute;todo de fenol-cloroformo (65).</p>     <p>Se amplificaron 12 polimorfismos en los genes: angiotensin&oacute;geno ( <i>AGT </i>), receptor de angiotensina II tipo 1 ( <i>AGTR1 </i>), enzima convertidora de angiotensina ( <i>ACE </i>), receptor ß 2 adren&eacute;rgico ( <i>ADRB2 </i>), receptor de dopamina tipo 1 ( <i>DRD1 </i>), aduccinas a y ß ( <i>ADD1 </i>, <i>ADD2 </i>), ATPasa de Ca2+ de membrana plasm&aacute;tica 1 ( <i>ATP2B1 </i>), receptor de tromboxano A2 ( <i>TBXA2R </i>) y sintasa de prostaglandina 2 ( <i>PTGS2 </i>). La amplificaci&oacute;n de los marcadores se hizo por medio de la reacci&oacute;n en cadena de la polimerasa (PCR). De las 12 variantes, 11 fueron cambios en el polimorfismo de un solo nucle&oacute;tido ( <i>Single Nucleotide </i><i>Polymorphism </i>, <i>SNP) </i>y la discriminaci&oacute;n al&eacute;lica se hizo con la digesti&oacute;n de enzimas espec&iacute;ficas de restricci&oacute;n ( <i>Specific Restriction Fragment Length </i><i>Polymorphism, </i>RFLP). Uno de los polimorfismos localizado en el gen <i>ACE </i>corresponde a la presencia o ausencia de una inserci&oacute;n de tipo Alu de 288 pb en el intr&oacute;n 16; el tama&ntilde;o al&eacute;lico se determin&oacute; mediante electroforesis en geles de agarosa al 2 %, te&ntilde;idos con bromuro de etidio.</p>     <p>Las variantes evaluadas, la secuencia de los cebadores para la amplificaci&oacute;n y la enzima de restricci&oacute;n utilizada, se muestran en el <a href="#cuadro">cuadro 1</a>.</p>     <p>    <center>   <a name="cuadro1"><img src="img/revistas/bio/v33n4/v33n4a13t1.gif"></a>     </center></p>     ]]></body>
<body><![CDATA[<p>La secuencia de nucle&oacute;tidos alrededor de cada SNP seleccionado, se tom&oacute; de la base de datos del genoma humano del <i>National Center for </i><i>Biotechnology Information </i>, disponible en <a href="http://ncbi.nlm.nih.gov" target="_blank">http://ncbi.nlm.nih.gov</a>. Para el dise&ntilde;o de los iniciadores y la determinaci&oacute;n de las condiciones de amplificaci&oacute;n, se utiliz&oacute; el <i>software </i>PRIMER3plus (http://www.bioinformatics.nl/cgi-bin/primer3plus/primer3plus.cgi). Las enzimas de restricci&oacute;n para cada polimorfismo se seleccionaron empleando el <i>software </i>NEBcutter, versi&oacute;n 2.0, disponible en http://tools.neb.com/NEBcutter2/. Los fragmentos digeridos se visualizaron en geles de agarosa te&ntilde;idos con bromuro de etidio y se emplearon marcadores de peso molecular adecuados para los tama&ntilde;os al&eacute;licos esperados.</p>     <p>Para el an&aacute;lisis de mezcla, se utiliz&oacute; un grupo de 20 marcadores informativos de ascendencia ( <i>Ancestry </i>- <i>Informative Marker, </i>AIM) ubicados en cromosomas autos&oacute;micos y con alto poder informativo (d&gt;45 %) entre las poblaciones ancestrales de la poblaci&oacute;n antioque&ntilde;a (amerindia, africana y europea) (<a href="#cuadro2">cuadro 2</a>). Los valores delta promedio entre poblaciones para este panel son de 0,51 (amerindio-africano); 0,46 (africanoauropeo), y 0,41 entre amerindio y auropeo. Nueve de estos marcadores se genotipificaron utilizando el m&eacute;todo de PCR-RFLP (<a href="#cuadro3">cuadro 3</a>); los tama&ntilde;os al&eacute;licos se resolvieron en geles de agarosa. Los 11 AIM restantes son de tipo inserci&oacute;n/deleci&oacute;n, denominados MID ( <i>Marker Insertion Deletion </i>), tomados de la base de datos de <i>Marshfield-Human </i><i>Insertion/Deletion Polymorphisms </i>, disponible en <a href="http://www.marshfieldclinic.org/mgs/pages/default.aspx?page=didp" target="_blank">http://www.marshfieldclinic.org/mgs/pages/default.aspx?page=didp</a> y fueron tipificados directamente por diferencias de tama&ntilde;o en geles de agarosa te&ntilde;idos con bromuro de etidio. Para la determinaci&oacute;n de los fragmentos se utilizaron marcadores de peso molecular. La lectura de los genotipos fue hecha por dos personas independientemente, sin previo conocimiento del grupo al que pertenec&iacute;an las muestras.</p>     <p>    <center>   <a name="cuadro2"><img src="img/revistas/bio/v33n4/v33n4a13t2.gif"></a>     </center></p> 	    <p>    <center>   <a name="cuadro3"><img src="img/revistas/bio/v33n4/v33n4a13t3.gif"></a>     </center></p>     <p><b><i>An&aacute;lisis estad&iacute;stico </i></b></p>     <p>Se hizo la descripci&oacute;n de las variables para toda la muestra y en los grupos de casos y controles, as&iacute; como las diferencias entre estos grupos. Para evaluar la asociaci&oacute;n de las variables categ&oacute;ricas (estrato socioecon&oacute;mico y sexo) con el estatus de afecci&oacute;n, se practicaron pruebas de ji al cuadrado ( ? 2 ) de independencia. Se hicieron comparaciones de promedios o medianas, entre los grupos de casos y controles para las variables continuas, como edad, IMC, y proporciones de mezcla individual, seg&uacute;n se cumpliera el supuesto de normalidad de los datos. Las variables que presentaron diferencias significativas entre casos y controles, se consideraron en an&aacute;lisis posteriores como posibles variables de confusi&oacute;n de las asociaciones con los marcadores gen&eacute;ticos. Estos an&aacute;lisis se hicieron con el paquete estad&iacute;stico SPSS ( <i>Statistical Package for the Social Sciences </i>), versi&oacute;n 15.1; en todos los casos se utiliz&oacute; un nivel de significancia de 0,05.</p>     <p>El c&aacute;lculo de las frecuencias al&eacute;licas, genot&iacute;picas y el equilibrio Hardy-Weinberg para los grupos de casos y controles, se llev&oacute; a cabo utilizando el programa PLINK Versi&oacute;n 1.07 disponible en <a href="http://pngu.mgh.harvard.edu/~purcell/plink/index.shtml" target="_blank">http://pngu.mgh.harvard.edu/~purcell/plink/index.shtml</a>.</p>     <p>Se utiliz&oacute; el programa ADMIXMAP, versi&oacute;n 3.8, para calcular la composici&oacute;n gen&eacute;tica ancestral (europea, amerindia y africana) para cada individuo, as&iacute; como para la poblaci&oacute;n total, la de casos y la de controles. ADMIXMAP, versi&oacute;n 3.8, es un programa que emplea aproximaciones cl&aacute;sicas y bayesianas para modelar la mezcla individual, haciendo uso de la informaci&oacute;n aportada por los genotipos para los AIM en la poblaci&oacute;n h&iacute;brida en estudio, as&iacute; como de la informaci&oacute;n <i>a priori </i>sobre la frecuencia de estos marcadores en las poblaciones parentales (66,67). Los &iacute;ndices de ascendencia individuales europeo, africano y amerindio obtenidos, se usaron como posibles variables de confusi&oacute;n, por los cuales las asociaciones fueron corregidas.</p>     ]]></body>
<body><![CDATA[<p>Asimismo, se prob&oacute; el grado de diferenciaci&oacute;n gen&eacute;tica entre los grupos mediante el c&aacute;lculo del &iacute;ndice de fijaci&oacute;n de Wright F ST para los AIM, para lo cual se emple&oacute; el programa ARLEQUIN 2.000.</p>     <p>Se evalu&oacute; la asociaci&oacute;n entre la presencia de hipertensi&oacute;n arterial esencial con los polimorfismos estudiados; se calcularon las razones de momios ( <i>odds ratio </i>, OR) con intervalos de confianza del 95 %. Adem&aacute;s, se construyeron modelos multivariados de regresi&oacute;n log&iacute;stica binaria, incluyendo en el modelo las covariables edad, IMC, sexo e &iacute;ndice individual de ascendencia. Para la evaluaci&oacute;n de asociaci&oacute;n al&eacute;lica, se utiliz&oacute; el programa PLINK, versi&oacute;n 1.07, y el paquete SNPassoc del programa R, versi&oacute;n 2.6.1, para la evaluaci&oacute;n de asociaciones genot&iacute;picas; estas &uacute;ltimas se hicieron mediante an&aacute;lisis de regresi&oacute;n log&iacute;stica para los modelos de herencia dominante, recesivo, sobredominante y aditivo. El mejor modelo gen&eacute;tico para explicar la asociaci&oacute;n se seleccion&oacute; usando el criterio de informaci&oacute;n de Akaike (68,69).</p>     <p>Para el an&aacute;lisis de asociaci&oacute;n entre la proporci&oacute;n de mezcla gen&eacute;tica e hipertensi&oacute;n arterial, se emplearon modelos de regresi&oacute;n lineal multivariado, en los cuales se incluyeron como covariables la edad, el sexo, el IMC y el estrato socioecon&oacute;mico. Fue necesario transformar los valores de los componentes ancestrales a valores z, dado que estos no presentaron una distribuci&oacute;n normal.</p>     <p>Para evaluar el efecto del componente ancestral sobre los niveles de presi&oacute;n arterial diast&oacute;lica y sist&oacute;lica, se calcularon los coeficientes de correlaci&oacute;n. Este an&aacute;lisis se hizo en la poblaci&oacute;n total. Se eval&uacute;o la asociaci&oacute;n de los genes con los niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica mediante ANOVA no param&eacute;trica de Kruskal Wallis. Se construyeron modelos multivariados de regresi&oacute;n lineal, con el fin de ajustar la asociaci&oacute;n de los genotipos con los niveles presi&oacute;n arterial diast&oacute;lica y sist&oacute;lica, por las variables edad, sexo, IMC e &iacute;ndice de ascendencia; cada &iacute;ndice de ascendencia se evalu&oacute; por separado. Los valores de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica se transformaron previamente a valores z con el fin de cumplir con el supuesto del modelo de regresi&oacute;n lineal. Adem&aacute;s, se exploraron los posibles efectos de interacci&oacute;n entre pares de polimorfismos mediante an&aacute;lisis de regresi&oacute;n log&iacute;stica, incluyendo los t&eacute;rminos de interacci&oacute;n con las variables de confusi&oacute;n identificadas previamente. Los resultados de estos modelos se evaluaron con modelos de permutaci&oacute;n, debido a que se encontraron intervalos de confianza amplios para el OR. Estos an&aacute;lisis se hicieron con el <i>software </i>SPSS, versi&oacute;n 15.1.</p>     <p><b><i>Consideraciones &eacute;ticas </i></b></p>     <p>El protocolo del estudio y el formato de consentimiento informado fueron aprobados por el Comit&eacute; de &Eacute;tica de la Sede de Investigaci&oacute;n Universitaria de la Universidad de Antioquia. Todos los participantes leyeron y comprendieron el documento informativo y luego firmaron el consentimiento informado.</p>     <p><b>Resultados </b></p>     <p><b><i>Poblaci&oacute;n de estudio </i></b></p>     <p>Las caracter&iacute;sticas sociodemogr&aacute;ficas de la poblaci&oacute;n y la comparaci&oacute;n entre los grupos para variables antropom&eacute;tricas y niveles de presi&oacute;n arterial, se presentan en el <a href="#cuadro4">cuadro 4</a>. Se encontraron diferencias significativas para edad, IMC y sexo, entre los grupos de casos y controles. Se encontr&oacute; mayor edad (p=0,01), mayor IMC (p=0,01) y mayor porcentaje de hombres (p=0,01) en el grupo de controles que en el de casos. Como era de esperarse, las medidas de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica fueron mayores en casos que en controles.</p>      <p>    ]]></body>
<body><![CDATA[<center>   <a name="cuadro4"><img src="img/revistas/bio/v33n4/v33n4a13t4.gif"></a>     </center></p>     <p><b><i>Marcadores informativos de ascendencia </i></b></p>     <p>Todos los AIM estuvieron en equilibrio Hardy- Weinberg en la poblaci&oacute;n total y en el grupo de casos. Se observan peque&ntilde;as desviaciones de estas frecuencias dentro del grupo de controles para los marcadores FY-null, MID1358 y Sb19.3; sin embargo, la significancia de la prueba no permanece luego de la correcci&oacute;n de Bonferroni, donde el umbral de significancia corregido es de 0,0025.</p>     <p>Los promedios de ascendencia amerindia, africana y europea para la poblaci&oacute;n total, fueron de 24,2&plusmn;7,6 %, 10,6&plusmn;6,9 % y 65,2&plusmn;8,9 %, respectivamente. No hubo diferencias significativas entre los grupos de casos y controles.</p>     <p><b><i>Pruebas de estructuraci&oacute;n de poblaci&oacute;n </i></b></p>     <p>No se encontraron indicios de estructuraci&oacute;n de poblaci&oacute;n entre los grupos de casos y controles, medidos mediante del &iacute;ndice de fijaci&oacute;n de Wright F ST a partir de los 20 AIM evaluados (F ST =0,0004).</p>     <p><b><i>Variantes en los genes candidatos </i></b></p>     <p>Los genotipos para los marcadores en genes candidatos se distribuyeron de acuerdo con lo esperado bajo el modelo de equilibrio Hardy- Weinberg en la poblaci&oacute;n total. Sin embargo, se observ&oacute; una leve desviaci&oacute;n de la expectativa seg&uacute;n este modelo para el marcador rs686 en el gen <i>DRD1 </i>, pero s&oacute;lo en el grupo de casos; la significancia se pierde al hacer la correcci&oacute;n por m&uacute;ltiples pruebas.</p>     <p><b><i>An&aacute;lisis de asociaci&oacute;n de los genes candidatos con hipertensi&oacute;n arterial </i></b></p>     <p>En el an&aacute;lisis de asociaci&oacute;n al&eacute;lica de cada SNP en los genes candidatos con hipertensi&oacute;n arterial, se encontr&oacute; asociaci&oacute;n entre el alelo C del polimorfismo rs4852706 en el gen <i>ADD2 </i>, con un OR de 1,5 (p=0,031) y para el alelo T del polimorfismo rs624833 en el gen <i>ADD1 </i>con un OR de 1,5 (p=0,037) (<a href="#cuadro5">cuadro 5</a>). Al ajustar por edad, sexo e IMC, se conserv&oacute; la asociaci&oacute;n con la variante rs4852706 del gen <i>ADD2 </i>, donde el alelo C es el que confiere riesgo para la hipertensi&oacute;n con un OR de 2,0 (p=0,013), pero se perdi&oacute; la asociaci&oacute;n identificada con el rs624833 en <i>ADD1 </i> (<a href="#cuadro5">cuadro 5</a>), lo cual indica que esta asociaci&oacute;n se deb&iacute;a realmente al efecto de alguno de los factores de confusi&oacute;n por los cuales se corrigi&oacute;. No se observ&oacute; modificaci&oacute;n significativa en la asociaci&oacute;n al incluir cada uno de los componentes ancestrales por separado como covariables. En ninguno de los casos se conserva la asociaci&oacute;n despu&eacute;s de hacer la correcci&oacute;n por m&uacute;ltiples pruebas, la cual arroj&oacute; un umbral de significancia de 0,0045. Este fue calculado como 0,05/11, ya que se observ&oacute; que los marcadores en el gen <i>ATP2B1 </i>(rs2681472 y rs17249754) se encuentran en desequilibrio de ligamiento en la poblaci&oacute;n analizada (D&acute;=0,832).</p>     ]]></body>
<body><![CDATA[<p>    <center>   <a name="cuadro5"><img src="img/revistas/bio/v33n4/v33n4a13t5.gif"></a>     </center></p>     <p>Al evaluar la asociaci&oacute;n genot&iacute;pica ajustando por las covariables IMC, edad y sexo, e incluyendo cada uno de los componentes ancestrales por separado, se observ&oacute; asociaci&oacute;n genot&iacute;pica con tres de los SNP: nuevamente como en la asociaci&oacute;n al&eacute;lica el marcador rs4852706 en el gen <i>ADD2 </i>, donde se encontr&oacute; que los genotipos CC-CT confieren tres veces el riesgo de presentar hipertensi&oacute;n arterial en relaci&oacute;n con el genotipo TT (modelo dominante, OR=3,0; IC 95% 1,1-8,3; p=0,023). Para el rs1042718 en <i>ADR </i>ß <i>2 </i>se observ&oacute; un riesgo de 10 veces para hipertensi&oacute;n arterial para los genotipos CC-AC con respecto al homocigoto AA (modelo dominante, OR=10,0; IC 95% 1,5-100,0; p=0,008); y, finalmente, el genotipo heterocigoto AG para el rs686 en <i>DRD1 </i>se encontr&oacute; como un genotipo protector, relacionado con una disminuci&oacute;n en la propensi&oacute;n a hipertensi&oacute;n arterial del 62 %, comparado con los genotipos homocig&oacute;ticos (modelo sobredominante, OR=0,38; IC 95% 0,16-0,82; p=0,012) (<a href="#cuadro6">cuadro 6</a>). Luego de incluir uno a uno los componentes ancestrales, no se observ&oacute; modificaci&oacute;n significativa en las asociaciones encontradas. Las asociaciones no se conservan significativas luego de hacer el ajuste por Bonferroni, el cual arroj&oacute; un valor de significancia de 0,001.</p>     <p>    <center>   <a name="cuadro6"><img src="img/revistas/bio/v33n4/v33n4a13t6.gif"></a>     </center></p>     <p>Mediante an&aacute;lisis de regresi&oacute;n log&iacute;stica binaria, se evaluaron los efectos de interacci&oacute;n entre los polimorfismos, y su asociaci&oacute;n con hipertensi&oacute;n arterial, al incluir y evaluar la significancia de los t&eacute;rminos de interacci&oacute;n construidos por pares de marcadores. En todos los modelos se ajust&oacute; por edad, sexo, IMC y composici&oacute;n ancestral. Al probar todas las posibles combinaciones por pares de marcadores, fueron significativas cinco interacciones; tres de ellas involucran el marcador rs686 del gen <i>DRD1 </i>, este presenta efectos de interacci&oacute;n sobre el riesgo para hipertensi&oacute;n arterial con las variantes rs4762 ( <i>AGT </i>), rs5186 ( <i>AGTR1 </i>) y rs624833 ( <i>ADD1 </i>). La variante rs624833 ( <i>ADD1 </i>), adem&aacute;s de modificar el efecto de rs686, tambi&eacute;n lo hizo con las variantes rs2681472 del gen <i>ATP2B1 </i>, y 2066826 en el gen <i>PTGS2 </i>(<a href="#cuadro7">cuadro 7</a>). La naturaleza de las interacciones encontradas es sin&eacute;rgica, potenciando el riesgo sobre la enfermedad, en el caso de <i>DRD1 </i>- <i>AGT </i>(OR=17,5; p=0,008) y <i>ADD1 </i>con <i>PTGS2 </i>(OR=31,2; p=0,031); y antag&oacute;nicas, contrarrestando el riesgo que aportan las variantes si actuaran de manera independiente una de la otra; en el caso de las interacciones <i>DRD1 </i>- <i>AGTR1 </i>(OR=0,05; p=0,03); <i>DRD1 </i>- <i>ADD1 </i>(OR=0,04; p=0,008) y <i>ATP2B1 </i>- <i>ADD1 </i>(OR=0,04; p=0,016) (<a href="#figura1">figura 1</a>).</p>     <p>    <center>   <a name="cuadro7"><img src="img/revistas/bio/v33n4/v33n4a13t7.gif"></a>     </center></p> 	 	    <p>    <center>   <a name="figura1"><img src="img/revistas/bio/v33n4/v33n4a13i1.jpg"></a>     </center></p>     ]]></body>
<body><![CDATA[<p>Los resultados de estas interacciones se evaluaron mediante modelos de permutaci&oacute;n, esto debido a los amplios intervalos de confianza observados para los OR. Se encontr&oacute; que, para las interacciones entre los pares de marcadores rs624833 ( <i>ADD1 </i>) y rs686 ( <i>DRD1 </i>), y entre rs2066826 ( <i>PTGS2 </i>) y rs624833 ( <i>ADD1 </i>), fueron suficientes siete permutaciones en ambos casos para encontrar convergencia entre los coeficientes de regresi&oacute;n; en el caso de el programa empleado (SPSS) las permutaciones se detienen (la estimaci&oacute;n finaliza) cuando las estimaciones de dichos par&aacute;metros han cambiado en menos de 0,001. Adem&aacute;s, se observ&oacute; que el valor de -2 Log de la verosimilitud disminuy&oacute; de 300,8 a 148,9 para la interacci&oacute;n entre rs624833 ( <i>ADD1 </i>) y rs686 ( <i>DRD1 </i>), despu&eacute;s de incluir todas las covariables (sexo, edad, IMC y componente gen&eacute;tico ancestral); y de 303,7 a 154,3, para la interacci&oacute;n entre rs2066826 ( <i>PTGS2 </i>) y rs624833 ( <i>ADD1 </i>), luego de incluir todas las covariables (sexo, edad, IMC y componente gen&eacute;tico ancestral). De manera contraria, para las interacciones por pares de marcadores restantes <i>AGT </i>rs4762 x <i>DRD1 </i>rs686; <i>AGTR1 </i>rs5186 x <i>DRD1 </i>rs686; y <i>ATP2B1 </i>rs2681472 x <i>ADD1 </i>rs624833, no fue posible encontrar convergencia entre las estimaciones de los coeficientes de regresi&oacute;n despu&eacute;s de llegar al n&uacute;mero m&aacute;ximo de iteraciones que permiti&oacute; el programa empleado (700 iteraciones); es decir, que las estimaciones de los par&aacute;metros fueron diferentes en un valor mayor a 0,001, por lo cual no pudieron ser estimadas por el programa.</p>     <p><b><i>An&aacute;lisis de asociaci&oacute;n de los genes candidatos con niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica </i></b></p>     <p>Al evaluar el efecto de los genotipos en los genes candidatos sobre los niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica mediante ANOVA no param&eacute;trica, no se encontraron diferencias significativas por genotipo para ninguno de los polimorfismos (46). Posteriormente, se incluyeron las covariables edad, sexo, IMC, edad e &iacute;ndices de ascendencia en un modelo multivariado de regresi&oacute;n lineal; ninguno de los marcadores en los genes candidatos presentaron una relaci&oacute;n con presi&oacute;n arterial sist&oacute;lica o diast&oacute;lica. Los modelos muestran una relaci&oacute;n directa del IMC con los niveles de presi&oacute;n arterial sist&oacute;lica; un incremento de una unidad en el IMC incrementa en 0,048 y 0,047 desviaciones est&aacute;ndar los niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica, respectivamente. De igual manera, la edad se relaciona directamente con los niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica; un incremento en un a&ntilde;o de edad responde por el incremento en 0,027 y 0,019 desviaciones est&aacute;ndar de los niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica, de manera respectiva. Se observ&oacute; que la proporci&oacute;n de mezcla gen&eacute;tica amerindia es un factor protector independiente del IMC, la edad y el sexo; el incremento en el &iacute;ndice de ascendencia amerindia reduce en 1,5 desviaciones est&aacute;ndar la presi&oacute;n arterial diast&oacute;lica; la relaci&oacute;n de la ascendencia amerindia con los niveles de presi&oacute;n arterial sist&oacute;lica no son significativos; sin embargo, se observa la misma tendencia que para la presi&oacute;n arterial diast&oacute;lica.</p>     <p><b><i>An&aacute;lisis de asociaci&oacute;n entre composici&oacute;n </i></b><b><i>ancestral e hipertensi&oacute;n arterial </i></b></p>     <p>Para el an&aacute;lisis de asociaci&oacute;n entre los componentes ancestrales y la hipertensi&oacute;n arterial se emple&oacute; un modelo de regresi&oacute;n lineal multivariado, incluyendo las covariables sexo, edad, IMC y estrato socioecon&oacute;mico; ninguno de los componentes ancestrales mostr&oacute; asociaci&oacute;n con hipertensi&oacute;n arterial. Sin embargo, los modelos muestran una asociaci&oacute;n del &iacute;ndice de ascendencia africana con el IMC; por cada desviaci&oacute;n est&aacute;ndar que aumenta la proporci&oacute;n de mezcla africana, se observa un aumento de 0,035 unidades en el IMC.</p>     <p><b><i>Asociaci&oacute;n entre composici&oacute;n ancestral y niveles de presi&oacute;n arterial sist&oacute;lica y diast&oacute;lica </i></b></p>     <p>Se estim&oacute; la correlaci&oacute;n entre cada componente ancestral y los niveles de presi&oacute;n arterial, tanto para presi&oacute;n arterial sist&oacute;lica como para la diast&oacute;lica (46). Se observ&oacute; una correlaci&oacute;n inversa y significativa entre el porcentaje de mezcla amerindia con los niveles de presi&oacute;n arterial sist&oacute;lica; por cada incremento en el grado de mezcla ancestral amerindia, la presi&oacute;n arterial diast&oacute;lica disminuy&oacute; en 0,12 mm Hg. Para la presi&oacute;n arterial sist&oacute;lica se observ&oacute; una tendencia en el mismo sentido, pero no es significativa (<a href="#cuadro8">cuadro 8</a>).</p>     <p>    <center>   <a name="cuadro8"><img src="img/revistas/bio/v33n4/v33n4a13t8.gif"></a>     </center></p>     <p><b>Discusi&oacute;n </b></p>     ]]></body>
<body><![CDATA[<p>En este estudio identificamos efectos principales de polimorfismos en los genes <i>DRD1 </i>, <i>ADD2 </i>y <i>ADRB2 </i>sobre el riesgo a hipertensi&oacute;n arterial despu&eacute;s de ajustar por las variables de confusi&oacute;n edad, sexo, IMC y composici&oacute;n gen&eacute;tica ancestral. Se encontr&oacute; que las personas portadoras del alelo C del polimorfismo rs4852706 en el gen de la ß -aduccina ( <i>ADD2 </i>), tienen un riesgo 2,0 veces (OR=2,02; p=0,013) el de las personas que no lo portan, de presentar hipertensi&oacute;n arterial. De la misma manera, se encontr&oacute; que las personas que presentan los genotipos CC y CT para este mismo marcador, tienen una propensi&oacute;n a desarrollar hipertensi&oacute;n arterial de 3,0 veces el riesgo de las personas homocigotas T/T. Hasta el momento, no hay estudios reportados que eval&uacute;en el efecto que tiene la variante rs4852706 del gen <i>ADD2 </i>sobre la propensi&oacute;n a la hipertensi&oacute;n arterial. Sin embargo, otra variante ubicada en el mismo intr&oacute;n se ha asociado previamente con variaci&oacute;n en los valores de presi&oacute;n arterial en poblaci&oacute;n cauc&aacute;sica (70,71). Esto puede indicar que en esta regi&oacute;n existen una o m&aacute;s variantes en desequilibrio de ligamiento (DL) con las asociadas que aportan al riesgo de hipertensi&oacute;n, o que la variante rs4852706 se encuentra en DL con la asociada previamente en la poblaci&oacute;n cauc&aacute;sica. Adem&aacute;s, se han reportado estudios en los que se han evaluado otras variantes en el gen <i>ADD2 </i>que han mostrado estar asociadas con hipertensi&oacute;n arterial o rasgos hemodin&aacute;micos relacionados en poblaciones europeas (72), aunque las asociaciones no han sido constantes en otras poblaciones (72-74).</p>     <p>Por otro lado, se encontr&oacute; asociaci&oacute;n estad&iacute;sticamente significativa entre el marcador rs1042718 en el gen del receptor ß -adren&eacute;rgico 2 y la hipertensi&oacute;n arterial, con el cual se observa que las personas portadoras de los genotipos CC y AC presentan 10 veces el riesgo de quienes portan el genotipo AA. Sin embargo, su intervalo de confianza es bastante amplio, lo cual puede deberse a la frecuencia tan baja del genotipo de referencia (AA) en esta muestra.</p>     <p>Hongyan Wu, <i>et al </i>., han descrito resultados similares, quienes encontraron asociaci&oacute;n significativa entre el alelo C del polimorfismo rs1042718 con hipertensi&oacute;n esencial en poblaci&oacute;n asi&aacute;tica (75). El an&aacute;lisis se hizo en dos poblaciones chinas consideradas gen&eacute;ticamente aisladas y s&oacute;lo se encontr&oacute; asociaci&oacute;n para una de ellas, lo cual sugiere una clara heterogeneidad gen&eacute;tica para la variaci&oacute;n en el gen <i>ADRB2 </i>relacionado con hipertensi&oacute;n esencial, aun entre poblaciones cercanamente relacionadas (75,76).</p>     <p>A pesar de estas evidencias a favor de la asociaci&oacute;n entre el gen <i>ADRB2 </i>y la hipertensi&oacute;n o presi&oacute;n arterial, otros estudios han fallado al replicar dicha asociaci&oacute;n en poblaci&oacute;n cauc&aacute;sica (77,78) y en afroamericanos (79). En el estudio de Aristiz&aacute;bal, <i>et al </i>., en poblaci&oacute;n antioque&ntilde;a, se evalu&oacute; la asociaci&oacute;n entre 9 polimorfismos en <i>ADRB2 </i>y la presi&oacute;n arterial elevada, sin encontrarse asociaci&oacute;n con ninguno de los SNP (47). No obstante, uno de los marcadores evaluados, el polimorfismo Arg16Gly que ha sido asociado con la propensi&oacute;n al desarrollar hipertensi&oacute;n arterial en otras poblaciones y cuyo alelo de riesgo Gly16 presenta una gran frecuencia en poblaciones latinas (80,81), se asoci&oacute; con alteraciones hemodin&aacute;micas relacionadas con el gasto cardiaco en individuos homocigotos en dicho estudio (47).</p>     <p>El polimorfismo evaluado en el presente estudio, rs686 en el gen del receptor de dopamina 1, <i>DRD1 </i>, se encontr&oacute; asociado con hipertensi&oacute;n arterial; la condici&oacute;n heterocigota A/G se relaciona con una reducci&oacute;n del 62 % en el riesgo de presentar hipertensi&oacute;n arterial, en comparaci&oacute;n con las personas portadoras de los genotipos homocigotos AA y GG. Aunque en varios estudios se ha demostrado asociaci&oacute;n del gen <i>DRD1 </i>con hipertensi&oacute;n arterial y fenotipos relacionados (51,82,83), no se ha reportado en la literatura asociaci&oacute;n espec&iacute;ficamente del polimorfismo rs686 con hipertensi&oacute;n arterial. Se eligi&oacute; evaluar la asociaci&oacute;n con este polimorfismo debido a su influencia comprobada, en los niveles de este receptor de dopamina. Se demostr&oacute; que el polimorfismo se encuentra en el sitio de uni&oacute;n del microARN miR-504, localizado en la regi&oacute;n 3&acute;UTR del gen. El polimorfismo rs686 reside en la parte del 3&acute;UTR complementaria a la secuencia de uni&oacute;n del miR-504; la adecuada complementariedad es cr&iacute;tica en la funci&oacute;n de uni&oacute;n del microARN ; el cambio de A a G, reduce la uni&oacute;n del microARN y, por lo tanto, la eficiencia en el expresi&oacute;n del receptor de dopamina(84) este microARN act&uacute;a sobrerregulando la expresi&oacute;n del gen, de tal manera que habr&aacute; una mayor expresi&oacute;n de los receptores DRD1 en los individuos portadores del alelo A. Los efectos de la dopamina mediados por los receptores D1 (DRD1) se han asociado con la regulaci&oacute;n de la presi&oacute;n arterial por medio de la estimulaci&oacute;n de la diuresis y natriuresis, y del aumento de la vasodilataci&oacute;n (85,86). La activaci&oacute;n de DRD1 por la dopamina responde por el 50 % de la excreci&oacute;n de sodio en condiciones basales (87); por ello, la deficiencia intrarrenal de dopamina puede llevar a hipertensi&oacute;n (88). Adem&aacute;s, la secuencia que codifica el miR-504 se encuentra en el cromosoma X; por lo tanto, la modulaci&oacute;n de la expresi&oacute;n de estos receptores por parte de este microARN puede jugar un papel importante en la influencia del sexo sobre el riesgo de hipertensi&oacute;n.</p>     <p>Es posible que en este estudio no se encontrara una asociaci&oacute;n independiente significativa de las variantes rs2066826, rs4762, rs2863769, rs5186, rs624833, rs2681472, rs17249754 y rs4340, debido al tama&ntilde;o de la muestra, lo cual le confiere un bajo poder (64 % para detectar variantes con un OR de 1,5), o a la heterogeneidad gen&eacute;tica de la hipertensi&oacute;n arterial. Sin embargo, el efecto que algunas de estas variantes tienen sobre la propensi&oacute;n a la hipertensi&oacute;n arterial se pudo evidenciar al evaluar efectos de interacci&oacute;n por pares de genes. Se encontr&oacute; una clara evidencia de interacci&oacute;n g&eacute;nica entre las combinaciones <i>DRD1 </i>- <i>AGT </i>, <i>DRD1 </i>- <i>AGTR1 </i>, <i>ADD1 </i>- <i>DRD1 </i>, <i>PTGS2 </i>- <i>ADD1 </i>y <i>ATP2B1 </i>- <i>ADD1 </i>. Los efectos de interacci&oacute;n entre los genes <i>DRD1 </i>- <i>AGT </i>y <i>DRD1 </i>- <i>AGTR1 </i>, son coherentes con hallazgos previos que reportan la existencia de interacci&oacute;n funcional entre los genes del sistema RAAS y el sistema dopamin&eacute;rgico.</p>     <p>La dopamina renal es uno de los principales reguladores de la excreci&oacute;n de sodio renal con efectos natriur&eacute;ticos y diur&eacute;ticos (37). En forma similar a la dopamina, los p&eacute;ptidos del sistema renina-angiotensina-aldosterona RAS, contribuyen de manera importante a la regulaci&oacute;n de la homeostasis del sodio por medio de los receptores AGTR1 y AGTR2, por lo cual se han llevado a cabo varios estudios con el fin de comprender la relaci&oacute;n existente entre el sistema dopamin&eacute;rgico y el sistema RAAS, encontr&aacute;ndose que existe una interacci&oacute;n entre estos factores (87,89). Se ha mostrado que, al envejecer, una exagerada funci&oacute;n de los receptores renales AGTR1 est&aacute; asociada con una disminuci&oacute;n en la funci&oacute;n del receptor DRD1 y con niveles elevados de presi&oacute;n arterial en modelos de rat&oacute;n (90). Adem&aacute;s, el efecto natriur&eacute;tico de <i>DRD1 </i>es potenciado durante el bloqueo de los receptores AGTR1 (91); y la dopamina, por medio de sus acciones en los receptores DRD1, disminuye la expresi&oacute;n del <i>AGTR1 </i>y los sitios de uni&oacute;n de la angiotensina II en las c&eacute;lulas del t&uacute;bulo proximal renal (92,93).</p>     <p>Por otro lado, la interacci&oacute;n fisiol&oacute;gica entre <i>DRD1 </i>y <i>ADD1 </i>se ha reportado previamente en la literatura cient&iacute;fica. La uni&oacute;n de la dopamina a DRD1 lleva a una inhibici&oacute;n de la reabsorci&oacute;n de sodio, al promover la internalizaci&oacute;n de las Na+/K+ATPasas; este mecanismo requiere la formaci&oacute;n de ves&iacute;culas revestidas de clatrina, para lo cual la participaci&oacute;n de las prote&iacute;nas de citoesqueleto aduccinas es clave (94). Se ha observado que en presencia de mutaciones en <i>ADD1 </i>no se no lleva a cabo la endocitosis de las Na+/K+ ATPasas, a pesar del est&iacute;mulo por la dopamina, y por lo tanto, no se produce la inhibici&oacute;n esperada de la reabsorci&oacute;n de Na+ (39,94).</p>     <p>Asimismo, la interacci&oacute;n entre <i>ADD1 </i>y <i>ATP2B1 </i>corresponde con observaciones de que la ATPasas de calcio de membrana plasm&aacute;tica (ATP2Bs), adem&aacute;s de participar en la regulaci&oacute;n de la concentraci&oacute;n de calcio intracelular en el coraz&oacute;n y los vasos, son mol&eacute;culas implicadas en la modulaci&oacute;n de las v&iacute;as de transducci&oacute;n de se&ntilde;ales dependientes de calcio. De este modo, se ha observado interacci&oacute;n funcional de las ATP2Bs con prote&iacute;nas dependientes de la calmodulina como las sintasas de &oacute;xido n&iacute;trico endotelial, (eNOS) y neuronal (nNOS), y la cinasa de serina dependiente de calcio (CASK), entre otras (43,44,94,95). Por lo anterior, es posible que esta enzima se encuentre tambi&eacute;n modulando la funci&oacute;n de las aduccinas, ya que estas prote&iacute;nas dependen de la acci&oacute;n de la calmodulina (39).</p>     <p>De manera similar, los efectos de COX2 (PTGS2) se encuentran relacionados con la regulaci&oacute;n de la presi&oacute;n arterial, participando principalmente en la s&iacute;ntesis de la prostaciclina PGI2, un importante vasodilatador, antiagregante plaquetario y estimulador de la diuresis (96,97). Aunque no se ha reportado interacci&oacute;n de PTGS2 con aduccinas, nuestro hallazgo es coincide con reportes previos que han mostrado que la expresi&oacute;n renal de PTGS2 se incrementa en condiciones que llevan a un aumento en la reabsorci&oacute;n de sodio (98,99). Por lo tanto, una asociaci&oacute;n fisiol&oacute;gica de las prote&iacute;nas de citoesqueleto aduccinas involucradas en la regulaci&oacute;n de la concentraci&oacute;n renal de sodio, con PTGS2, es posible.</p>     ]]></body>
<body><![CDATA[<p>Sin embargo, al realizar modelos de permutaci&oacute;n para las interacciones observadas, quedaron validados los coeficientes de regresi&oacute;n y, por lo tanto, los OR obtenidos para las interacciones entre los polimorfismos rs624833 ( <i>ADD1 </i>) y rs686 ( <i>DRD1 </i>), y entre rs2066826 ( <i>PTGS2 </i>) y rs624833 ( <i>ADD1 </i>); pero no as&iacute; para las interacciones entre rs4762 ( <i>AGT </i>) y rs686 ( <i>DRD1 </i>) o rs5186 ( <i>AGTR1 </i>) y rs686 ( <i>DRD1 </i>), ni para rs2681472 ( <i>ATP2B1 </i>) y rs624833 ( <i>ADD1 </i>), al hacer el n&uacute;mero m&aacute;ximo de permutaciones que el programa permiti&oacute; (700 iteraciones). Por tal raz&oacute;n, estudios posteriores que cuenten con un tama&ntilde;o de muestra mayor podr&iacute;an permitir una mejor claridad, al menos desde el punto de vista estad&iacute;stico, de las relaciones epist&aacute;ticas que pueden existir entre estos genes.</p>     <p>Por otro lado, se observ&oacute; un efecto del componente gen&eacute;tico ancestral amerindio, sobre la reducci&oacute;n en los niveles de presi&oacute;n arterial diast&oacute;lica; sin embargo, no se encontr&oacute; asociaci&oacute;n entre el componente ancestral africano y la hipertensi&oacute;n arterial. En numerosos estudios se han demostrado que la prevalencia de la hipertensi&oacute;n arterial es bastante mayor en poblaci&oacute;n afroamericana, comparada con otros grupos &eacute;tnicos (5,6), y que la ascendencia africana se presenta como factor de riesgo para hipertensi&oacute;n (6,100,101). No obstante, la falla de nuestro estudio para encontrar un efecto del componente ancestral africano sobre la hipertensi&oacute;n arterial, puede explicarse porque la poblaci&oacute;n antioque&ntilde;a estudiada presenta un bajo componente gen&eacute;tico ancestral africano (10 %), lo cual sumado al modesto tama&ntilde;o de muestra, dificulta encontrar asociaci&oacute;n con el rasgo en estudio.</p>     <p>Aunque la ascendencia amerindia se ha descrito como un factor de riesgo cardiovascular, se ha observado que la prevalencia de hipertensi&oacute;n arterial es menor en poblaciones amerindias (9,10), y, por lo tanto, tambi&eacute;n el riesgo para estas poblaciones. As&iacute;, el riesgo cardiovascular que aporta el componente ancestral amerindio, est&aacute; relacionado con la mayor prevalencia observada de diabetes mellitus II en poblaciones ind&iacute;genas americanas, que en poblaciones con mayor porcentaje de ascendencia europea (102,103). La baja prevalencia de hipertensi&oacute;n arterial observada en poblaciones amerindias, como los ind&iacute;genas pima mejicanos, puede en parte explicarse por la menor actividad simp&aacute;tica, acompa&ntilde;ada de una menor respuesta beta-adren&eacute;rgica, observada en estos individuos en comparaci&oacute;n con poblaci&oacute;n cauc&aacute;sica; estos mecanismos pueden contribuir al menor riesgo que presentan estas poblaciones de desarrollar hipertensi&oacute;n arterial. Al igual que lo reportado en nuestro estudio, en un trabajo en Per&uacute;, se encontr&oacute; que los niveles de presi&oacute;n arterial son menores en individuos de ascendencia ind&iacute;gena, que en poblaci&oacute;n europea (10,104). Estos resultados son similares a los obtenidos en un estudio de Kosoy, <i>et al </i>. (105), en el cual se evalu&oacute; la relaci&oacute;n entre composici&oacute;n ancestral e hipertensi&oacute;n, usando las medidas de la presi&oacute;n arterial y mezcla individual, encontr&aacute;ndose una asociaci&oacute;n del componente ancestral amerindio como factor protector para hipertensi&oacute;n arterial (105).</p>     <p>Nuestros hallazgos aportan al conocimiento de los complejos mecanismos implicados en el desarrollo de hipertensi&oacute;n arterial. Sin embargo, la principal limitaci&oacute;n del estudio es el reducido tama&ntilde;o de la muestra, lo cual hace que el estudio presente un modesto poder para detectar variantes con efectos peque&ntilde;os (del 64 % para variantes con un OR de 1,5). Por lo tanto, es muy probable que en este estudio no se est&eacute;n detectando asociaciones de factores de riesgo moderados. Aunque, como ya fue observado, el efecto de algunos polimorfismos pudo ser detectado cuando se hicieron los an&aacute;lisis de interacciones entre los genes de las v&iacute;as reguladoras estudiadas, donde fueron evidentes los efectos de interacci&oacute;n g&eacute;nica sobre la etiolog&iacute;a de la hipertensi&oacute;n arterial esencial en poblaci&oacute;n antioque&ntilde;a. Igualmente, pudo observarse el efecto del componente ancestral amerindio como factor protector para el desarrollo de hipertensi&oacute;n arterial en esta muestra de poblaci&oacute;n.</p>      <p>    <center></center><b>Agradecimientos </b></center></p>     <p>Agradecemos el apoyo institucional de la Universidad de Antioquia y del Hospital Universitario San Vicente de Pa&uacute;l, Laboratorio Cl&iacute;nico IPS Universitaria, a todas las personas que amablemente colaboraron con la donaci&oacute;n de sus muestras y con su informaci&oacute;n, y al proyecto de sostenibilidad CODI UDEA 2013-2014.</p>      <p>    <center><b>Conflicto de intereses </b></center></p>     <p>Los autores declaran que no existe conflicto de intereses y que no hubo injerencia externa en el desarrollo de esta investigaci&oacute;n.</p>      ]]></body>
<body><![CDATA[<p>    <center><b>Financiaci&oacute;n </b></center></p>     <p>El estudio fue financiado por COLCIENCIAS (proyecto No. 111545921593) </p>      <p>Correspondencia: </p>     <p>Diana Mar&iacute;a Valencia, Laboratorio de Gen&eacute;tica Molecular, Universidad de Antioquia, Sede de Investigaci&oacute;n Universitaria, Calle 62 N&ordm; 52-59, torre 2, laboratorio 430, Medell&iacute;n, Colombia.</p>     <p>Tel&eacute;fono: (574) 219 6467; fax (574) 219 6469 <a href="mailto:dianav12@gmail.com">dianav12@gmail.com</a> </p>      <p>    <center><b>Referencias </b></center></p>     <!-- ref --><p>1. <b>De Souza F, Muxfeldt ES, Salles GF. </b>Prognostic factors in resistant hypertension: Implications for cardiovascular risk stratification and therapeutic management. 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