<?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>1657-9550</journal-id>
<journal-title><![CDATA[Biosalud]]></journal-title>
<abbrev-journal-title><![CDATA[Biosalud]]></abbrev-journal-title>
<issn>1657-9550</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Caldas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1657-95502009000100017</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[POSIBLE IMPLICACIÓN DEL GEN RNASEH1 EN LA ETIOLOGÍA DE DIABETES MELLITUS TIPO 1]]></article-title>
<article-title xml:lang="en"><![CDATA[POSSIBLE IMPLICATION OF THE RNASEH1 GENE IN THE ETIOLOGY OF TYPE 1 DIABETES MELLITUS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Astrid Jannet]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Balthazar]]></surname>
<given-names><![CDATA[Vital]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uribe]]></surname>
<given-names><![CDATA[Federico]]></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="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfaro]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pineda-Trujillo]]></surname>
<given-names><![CDATA[Nicolás]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Pediatría]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Medicina Interna]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Antioquia Instituto de Biología Corporación de Patologías Tropicales]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<volume>8</volume>
<numero>1</numero>
<fpage>143</fpage>
<lpage>152</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1657-95502009000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1657-95502009000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1657-95502009000100017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las enfermedades complejas se caracterizan porque presentan varios genes además de factores ambientales implicados en su etiología. Las bases genéticas de la diabetes mellitus tipo 1 (T1D) supone un efecto mayor del complejo HLA que interactúa con otros genes y con el ambiente. Mucho se ha descrito acerca de la posible participación de las infecciones virales como desencadenadores de T1D. En esta revisión exploramos los posibles mecanismos por los cuales el gen RNASEH1 podría estar participando en la etiología de T1D, a partir de una infección viral. El gen RNASEH1 se localiza en la región cromosómica 2p25, la cual ha sido recientemente implicada por nosotros en la susceptibilidad a T1D. Este gen ha sido implicado en la enfermedad mediante análisis genético. Acá pretendemos dar sentido biológico a los datos genéticos. Considerando que la enfermedad es multifactorial, este planteamiento no excluye la participación de otros genes u otros factores ambientales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Complex disorders are characterized by presenting many genes and other environmental factors implicated in their etiology. The genetic bases of type 1 diabetes mellitus (T1D) suppose a major effect of the HLA complex which interacts with other genes and the environment. Much has been written about the possible implication of viral infections as triggers of T1D. This review explores the mechanisms by which the RNASEH1 gene could be involved in the etiology of T1D, due to a viral infection. The RNASEH1 gene is located in chromosome 2p25, which has been recently implicated in the susceptibility to T1D by the authors, through genetic analysis. This text hopes to establish a biological context for the genetic data. Taking into account that this is a multifactorial disease, this approach does not exclude the eventual participation of other genes or environmental factors.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[diabetes tipo 1]]></kwd>
<kwd lng="es"><![CDATA[susceptibilidad genética]]></kwd>
<kwd lng="es"><![CDATA[gen RNASEH1]]></kwd>
<kwd lng="es"><![CDATA[factores ambientales]]></kwd>
<kwd lng="en"><![CDATA[type 1 diabetes]]></kwd>
<kwd lng="en"><![CDATA[genetic susceptibility]]></kwd>
<kwd lng="en"><![CDATA[RNASEH1 gene]]></kwd>
<kwd lng="en"><![CDATA[environmental factors]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">          <p align="center"><font size="4"><b>POSIBLE IMPLICACI&Oacute;N DEL GEN <i>RNASEH1</i> EN LA ETIOLOG&Iacute;A DE DIABETES MELLITUS TIPO 1<a href="#*">*</a></b></font></p>          <p align="center"><font size="3"><b>POSSIBLE IMPLICATION OF THE <i>RNASEH1</i> GENE IN THE ETIOLOGY OF TYPE 1 DIABETES MELLITUS</b></font></p>        <p>&nbsp;</p>          <p><b>Astrid Jannet Rodr&iacute;guez<sup>1</sup>, Javier Guti&eacute;rrez<sup>1</sup>, Vital Balthazar<sup>1</sup>, Federico Uribe<sup>2</sup>, Gabriel Bedoya<sup>3</sup>, Juan Manuel Alfaro<sup>1</sup> y Nicol&aacute;s Pineda-Trujillo<sup>1</sup></b></p>          <p><i>1 Grupo Mapeo Gen&eacute;tico. Departamento de Pediatr&iacute;a, Facultad de Medicina, Universidad de Antioquia. Medell&iacute;n (Colombia). Autor de correspondencia: Nicol&aacute;s Pineda-Trujilllo. M.Sc, Ph.D. E-mail: <a href="mailto:nicolas.pineda@medicina.udea.edu.co">nicolas.pineda@medicina.udea.edu.co</a>.    <br>   2 Endocrinolog&iacute;a y Metabolismo, Departamento de Medicina Interna, Facultad de Medicina, Universidad de Antioquia. Medell&iacute;n (Colombia).    <br> 3 Grupo Gen&eacute;tica Molecular -GENMOL- Corporaci&oacute;n de Patolog&iacute;as Tropicales, Instituto de Biolog&iacute;a, Universidad de Antioquia. Medell&iacute;n (Colombia).</i></p>     <p><a name="*">*</a> Este trabajo fue realizado gracias a la financiaci&oacute;n de Colciencias y la Universidad de Antioquia. Proyectos: "Evaluaci&oacute;n de genes conocidos y desconocidos en una regi&oacute;n cromos&oacute;mica segregando con Diabetes Mellitus tipo C&oacute;digo: 111534319156; "Evaluaci&oacute;n autoinmune y asociaci&oacute;n del gen TPO en cien tr&iacute;os familiares Antioque&ntilde;os con Diabetes Mellitus tipo 1" C&oacute;digo: 8704-2449.</p>     <p>Recibido: septiembre 22 de 2009 - Aceptado: octubre 30 de 2009</p> <hr size="1" />          ]]></body>
<body><![CDATA[<p>&nbsp;</p>          <p><b>RESUMEN</b></p>          <p>Las enfermedades complejas se caracterizan   porque presentan varios genes adem&aacute;s de   factores ambientales implicados en su etiolog&iacute;a.   Las bases gen&eacute;ticas de la diabetes mellitus tipo   1 (T1D) supone un efecto mayor del complejo   HLA que interact&uacute;a con otros genes y con el   ambiente. Mucho se ha descrito acerca de la   posible participaci&oacute;n de las infecciones virales   como desencadenadores de T1D. En esta   revisi&oacute;n exploramos los posibles mecanismos   por los cuales el gen <i>RNASEH1</i> podr&iacute;a estar   participando en la etiolog&iacute;a de T1D, a partir de   una infecci&oacute;n viral.   El gen <i>RNASEH1</i> se localiza en la regi&oacute;n   cromos&oacute;mica 2p25, la cual ha sido recientemente   implicada por nosotros en la susceptibilidad   a T1D. Este gen ha sido implicado en la   enfermedad mediante an&aacute;lisis gen&eacute;tico. Ac&aacute;   pretendemos dar sentido biol&oacute;gico a los datos   gen&eacute;ticos. Considerando que la enfermedad es   multifactorial, este planteamiento no excluye   la participaci&oacute;n de otros genes u otros factores ambientales.</p>          <p><i>PALABRAS CLAVE</i>: diabetes tipo 1, susceptibilidad gen&eacute;tica, gen <i>RNASEH1</i>, factores ambientales.</p>  <hr size="1" />     <p>&nbsp;</p>          <p><b>ABSTRACT</b></p>          <p>Complex disorders are characterized by   presenting many genes and other environmental   factors implicated in their etiology. The genetic   bases of type 1 diabetes mellitus (T1D) suppose a   major effect of the HLA complex which interacts   with other genes and the environment. Much   has been written about the possible implication   of viral infections as triggers of T1D. This   review explores the mechanisms by which the   <i>RNASEH1</i> gene could be involved in the etiology   of T1D, due to a viral infection. The <i>RNASEH1</i>   gene is located in chromosome 2p25, which has   been recently implicated in the susceptibility to   T1D by the authors, through genetic analysis. This text hopes to establish a biological context   for the genetic data. Taking into account that this   is a multifactorial disease, this approach does   not exclude the eventual participation of other genes or environmental factors.</p>     <p><i>KEY WORDS</i>: type 1 diabetes, genetic susceptibility, <i>RNASEH1</i> gene, environmental factors.</p> <hr size="1" />               <p>&nbsp;</p>          <p><b>POSIBLE IMPLICACI&Oacute;N DEL GEN <i>RNASEH1</i> EN LA ETIOLOG&Iacute;A DE DIABETES MELLITUS TIPO 1</b></p>     ]]></body>
<body><![CDATA[<p>La diabetes mellitus tipo 1 (T1D) es un desorden   heterog&eacute;neo con etiolog&iacute;a multifactorial.   Para su susceptibilidad intervienen tanto   factores ambientales como gen&eacute;ticos. Adem&aacute;s   es importante la interacci&oacute;n que pueda   presentarse entre cada uno de estos factores de   susceptibilidad. La participaci&oacute;n de los genes se   ha documentado ampliamente como polig&eacute;nica   (<a href="#1">1</a>, <a href="#2">2</a>). Dentro de estos, la regi&oacute;n HLA ha sido   descrita como el mayor factor gen&eacute;tico de riesgo/   protecci&oacute;n a la enfermedad (<a href="#3">3</a>, <a href="#4">4</a>). No obstante,   existen otros genes fuera de HLA que tambi&eacute;n   aportan riesgo/protecci&oacute;n para la enfermedad.   Recientemente, en Antioquia, hemos identificado   un nuevo locus gen&eacute;tico asociado con la   susceptibilidad a T1D, el cual se localiza en la   regi&oacute;n cromos&oacute;mica 2p25 (<a href="#5">5</a>, <a href="#6">6</a>). En este locus   se encuentran aproximadamente veinte genes,   entre los que se destacan funcionalmente TPO   y <i>RNASEH1</i>, como posiblemente relacionados   con la susceptibilidad a T1D. En este art&iacute;culo   describiremos los posibles mecanismos por   los cuales <i>RNASEH1</i> estar&iacute;a implicado en la   etiolog&iacute;a de T1D. Actualmente est&aacute; en proceso   el an&aacute;lisis gen&eacute;tico tendiente a verificar la   presumible asociaci&oacute;n de este gen con la etiolog&iacute;a de la enfermedad.</p>     <p>&nbsp;</p>     <p><i><b>RNASEH1</b></i></p>     <p>El gen <i>RNASEH1</i> humano denominado   ribonucleasa H1, fue reportado y mapeado   inicialmente en la regi&oacute;n cromos&oacute;mica 17p11.2,   a trav&eacute;s de ensayos de hibridizaci&oacute;n <i>in situ</i>   (Fluorescent <i>in situ</i> hybridization, FISH) en   1998 (<a href="#7">7</a>). Sin embargo, la secuencia reportada   para este locus, al ser traducida a una secuencia   aminoac&iacute;dica, resulta en una prote&iacute;na no   funcional, adem&aacute;s de no coincidir con la secuencia   del cDNA (DNA copia) identificada y clonada   para el mismo gen por otros investigadores   (<a href="#8">8</a>). De esta forma en 2002, Anneloor <i>et al</i>.,   dilucidaron la verdadera posici&oacute;n del gen en   la regi&oacute;n 2p25, concluyendo adem&aacute;s que los   genes reportados y mapeados en el cromosoma   17, y otro en el cromosoma 1, por ellos mismos,   corresponden a pseudogenes de la prote&iacute;na ribonucleasa H1 (<a href="#9">9</a>).</p>     <p>El gen <i>RNASEH1</i> posee una secuencia   nucleot&iacute;dica de aproximadamente 10 kbp   estructurada en 8 exones, que codifica para un   prote&iacute;na de 286 &oacute; 260 residuos, resultantes de   posibles eventos de "splicing" alternativo. La   predicci&oacute;n proteica muestra que posee un motivo   RNAasa H en el C terminal y otro conservado en   el N terminal que en otras RNAsas eucari&oacute;ticas   ha sido implicado con la uni&oacute;n de dsRNA (RNA   de doble cadena) e h&iacute;bridos de RNA-DNA. La   prote&iacute;na ribonucleasa H1 presenta una expresi&oacute;n ubicua y constante en tejidos de rat&oacute;n (<a href="#9">9</a>).</p>     <p>&nbsp;</p>     <p><b>ACTIVIDAD FISIOL&Oacute;GICA</b></p>     <p>Las RNAsas en general, son nucleasas que   catalizan la hidr&oacute;lisis de RNA en componentes   m&aacute;s peque&ntilde;os y se pueden dividir en   endorribonucleasas y exorribonucleasas. La   funci&oacute;n m&aacute;s importante, reportada hasta el   momento de la RNAsa H, es remover los   iniciadores de RNA de los fragmentos de   Okazaki durante la s&iacute;ntesis de la cadena rezagada en la duplicaci&oacute;n del DNA (<a href="#10">10</a>), a   trav&eacute;s del reconocimiento del h&iacute;brido RNADNA   (<a href="#11">11</a>). Tambi&eacute;n podr&iacute;a estar participando   en procesos importantes durante el crecimiento   celular ya que la deleci&oacute;n de dicho gen en   organismos unicelulares disminuye la tasa de   crecimiento sin efectos letales (<a href="#12">12</a>). Por otro   lado, ratones "knockout" mueren durante la   embriog&eacute;nesis debido a que poseen una falla   en la replicaci&oacute;n del DNA mitocondrial (<a href="#13">13</a>).   Otros reportes indican que est&aacute; involucrada   en el procesamiento de bucles (loops) R para   la modulaci&oacute;n de la iniciaci&oacute;n de la replicaci&oacute;n   y la restauraci&oacute;n de la topolog&iacute;a del DNA   (<a href="#14">14</a>) en diferentes organismos incluyendo   <i>Escherichia coli</i> (<a href="#15">15</a>). Varias de estas actividades   pueden realizarse en ausencia completa de   las ribonucleasas H en humanos, siendo   reemplazadas por las subunidades catal&iacute;ticas   de la polimerasa I o por otras prote&iacute;nas. Es as&iacute;   como se sugiere un papel alternativo en el que s&iacute; es indispensable, pero que a&uacute;n no se conoce (<a href="#16">16</a>).</p>     <p>En los virus, el dominio RNAsa H que se   encuentra en la transcriptasa reversa (RT) puede   introducir espacios o "gaps" cerca del extremo   5' de la hebra molde de RNA despu&eacute;s de que   ha sido copiada al h&iacute;brido RNA-DNA. Esto   crea nuevos cebadores o "primers" con grupos   3' hidroxilo libres para la DNA polimerasa   viral. En la medida en que la DNA polimerasa   viral copia el molde de DNA, puede en una   reacci&oacute;n simult&aacute;nea remover cualquier RNA   viral remanente a trav&eacute;s de su actividad RNAsa,   dando como resultado un DNA de doble   cadena (<a href="#17">17</a>). As&iacute;, cualquier mutaci&oacute;n en dicho   dominio inhibe completamente la RT (<a href="#18">18</a>). De   ah&iacute; la motivaci&oacute;n en el estudio de esta prote&iacute;na   en virus, especialmente en VIH (virus de   inmunodeficiencia humana), ya que representa   un blanco muy atractivo para el desarrollo de nuevas drogas antivirales (<a href="#19">19</a>).</p>     <p>El dominio RNAsa H de muchas de las RT v&iacute;ricas,   puede unirse no s&oacute;lo a h&iacute;bridos DNA-RNA sino   tambi&eacute;n a d&iacute;meros RNA-RNA (<a href="#20">20</a>). Esta uni&oacute;n   permite tambi&eacute;n la degradaci&oacute;n de una de las   hebras de RNA (<a href="#20">20</a>, <a href="#21">21</a>), presuntamente por   el mismo mecanismo utilizado despu&eacute;s del   reconocimiento de heterod&iacute;meros de &aacute;cidos nucleicos (<a href="#21">11</a>).</p>     ]]></body>
<body><![CDATA[<p>Se presume que el mecanismo por el cual   la RNAsa H reconoce el dsRNA es a trav&eacute;s   de la interacci&oacute;n de una de las hebras con   amino&aacute;cidos positivamente cargados presentes   en una de las regiones estructurales de la   prote&iacute;na denominado "Protrucci&oacute;n B&aacute;sica".   Sin embargo, un estudio realizado en 1995 (<a href="#22">22</a>),   demostr&oacute; que en <i>Saccharomyces cerevisiae</i>, son las   repeticiones R1 y R2 (<a href="#fig1">Figura 1</a>) de la prote&iacute;na,   las que se unen espec&iacute;ficamente a dsRNA, en   vez del dominio RNAsa H. Todos los estudios   anteriores coinciden en la modulaci&oacute;n de dicha   actividad por las concentraciones de los iones Mg<sup>+2</sup> y Mn<sup>+2</sup>.</p>     <p align="center"><img src="img/revistas/biosa/v8n1/v8n1a17fig1.gif"><a name="fig1"></a></p>     <p>A partir de la actividad catal&iacute;tica de las RNAsas   H1 hasta el momento estudiadas en otros   organismos, pueden extrapolarse posibles   papeles de la misma prote&iacute;na en humanos,   llevando a proponer v&iacute;as hipot&eacute;ticas que   podr&iacute;an desencadenar el desarrollo de ciertas enfermedades, como la diabetes tipo 1 (T1D).</p>     <p>&nbsp;</p>     <p><b>DIABETES TIPO 1 E INFECCIONES VIRALES</b></p>     <p>La T1D es una enfermedad causada por la   destrucci&oacute;n autoinmune selectiva de las   c&eacute;lulas &beta; productoras de insulina en los islotes   pancre&aacute;ticos de Langerhans (<a href="#23">23</a>). Sin embargo,   el mecanismo que lleva a la manifestaci&oacute;n de la   autoinmunidad cl&iacute;nica es a&uacute;n desconocido. T1D   es un desorden polig&eacute;nico con una concordancia   entre gemelos monocigotos &le;50% (<a href="#24">24</a>). Tales   niveles de concordancia permiten sugerir   que otros factores tales como epigen&eacute;ticos o   medioambientales pueden estar implicados   (<a href="#25">25</a>). As&iacute;, la manifestaci&oacute;n de la T1D puede ser la   consecuencia de una compleja interacci&oacute;n entre factores ambientales y gen&eacute;ticos.</p>     <p>Los virus son los primeros candidatos en   considerarse un factor de riesgo medioambiental   ya que inducen una fuerte respuesta inmune   y pueden infectar el p&aacute;ncreas y las c&eacute;lulas &beta;   llevando a una inflamaci&oacute;n local (<a href="#2">2</a>). El aumento   en la incidencia en el inicio de T1D aguda   durante las estaciones, con un pico en el oto&ntilde;o   reportado hace aproximadamente 80 a&ntilde;os (<a href="#26">26</a>)   coincide con la afirmaci&oacute;n de que enfermedades   con incidencias estacionarias son generalmente   causadas por infecciones virales. Tambi&eacute;n   hay algunos datos de infecciones virales que   preceden o coinciden con el inicio de T1D, al   igual que reportes de virus aislados de tejido   pancre&aacute;tico de pacientes con diabetes aguda y de   inducci&oacute;n de diabetes en animales susceptibles por infecciones con tales aislados (<a href="#27">27</a>).</p>     <p>Hasta la fecha, varios virus humanos han sido   asociados con diabetes tipo 1 humana. Estos   incluyen coxsackie B virus (<a href="#28">28</a>, <a href="#29">29</a>), virus de   la rub&eacute;ola (<a href="#30">30</a>, <a href="#31">31</a>), virus de la parotiditis (<a href="#32">32</a>),   citomegalovirus (<a href="#33">33</a>, <a href="#34">34</a>), Epstein-Bar (<a href="#35">35</a>) y   Varicela Zoster (<a href="#36">36</a>). En animales, incluyendo   ratones, ratas, hamsters, ovejas, cerdos y   primates no humanos, se han asociado nueve virus con el desarrollo de diabetes tipo 1.</p>     <p>En ratones se han asociado con el desarrollo   de T1D los virus de la Encefalomiocarditis   (EMC) (<a href="#37">37</a>, <a href="#38">38</a>), los mengovirus (<a href="#39">39</a>), los reovirus   (<a href="#40">40</a>) y algunos retrovirus; Coxsackie B virus,   particularmente B4, en ratones (<a href="#41">41</a>-<a href="#43">43</a>) y primates   no humanos (<a href="#44">44</a>); virus de la rub&eacute;ola en hamsters   y conejos (<a href="#30">30</a>, <a href="#45">45</a>); virus de enfermedad mucosodiarreica   viral bovina en cabras (<a href="#46">46</a>), y KRV (Virus Kilham de la rata) en ratas (<a href="#47">47</a>, <a href="#48">48</a>)</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><b>VIRUS Y RNAsas</b></p>     <p>Como se mencion&oacute; anteriormente, numerosos   virus han sido asociados con el desarrollo   de T1D, sin embargo el virus humano m&aacute;s   estudiado a este respecto ha sido el virus   Coxsackie B (<a href="#29">29</a>). El virus Coxsackie B es un virus   perteneciente a la familia de los Picornaviridae   del g&eacute;nero <i>Enterovirus</i>. Poseen un genoma RNA   de cadena sencilla de aproximadamente 7,4 kb   que act&uacute;a directamente como un mRNA en c&eacute;lulas infectadas (<a href="#42">42</a>).</p>     <p>Se han detectado miembros de la familia   CV (Coxsackie virus) en tejido pancre&aacute;tico,   incluyendo c&eacute;lulas &beta;, de pacientes con T1D   (diabetes tipo 1) (<a href="#49">49</a>). CV infecta c&eacute;lulas &beta; <i>in vitro</i>, llevando frecuentemente a su destrucci&oacute;n y   disfunci&oacute;n (50). Para defenderse de los dram&aacute;ticos   efectos de CV, las c&eacute;lulas &beta; pancre&aacute;ticas secretan   IFN en los estadios tempranos de la infecci&oacute;n,   y s&oacute;lo de esta manera pueden sobrevivir (<a href="#51">51</a>).   Diferentes tipos de IFN pueden activar las   c&eacute;lulas NK ("natural killers"), macr&oacute;fagos y   c&eacute;lulas T (<a href="#52">52</a>). Por otro lado, los IFNs act&uacute;an en   una forma auto, para y endocrina, potenciando   la transici&oacute;n de c&eacute;lulas no infectadas a un estado   antiviral, y a uno apopt&oacute;tico en c&eacute;lulas ya infectadas con el fin de reducir la permisividad   de las c&eacute;lulas a la infecci&oacute;n (<a href="#53">53</a>). Este objetivo es   com&uacute;nmente llevado a cabo por la expresi&oacute;n de   prote&iacute;nas que exhiben actividades intracelulares   antivirales. Por ejemplo, la RNAsa L degrada   RNA hospedero y viral. Esta endonucleasa   es activada por 2,5-oligoadelinato (2,5A), que   es a su vez sintetizado por una familia de   enzimas denominadas 2-5A sintetasas (2,5AS)   (<a href="#54">54</a>). Las 2,5AS son activadas s&oacute;lo en presencia   de intermediarios de dsRNA virales. De esta   manera cuando es activada esta v&iacute;a los &aacute;cidos   nucleicos del virus comienzan a ser degradados por la RNAsa L (<a href="#55">55</a>).</p>     <p>Estudios sobre la importancia de las RNAsas   durante infecciones de CV concluyen que el IFN   previene la replicaci&oacute;n de CVB4 en los islotes del   p&aacute;ncreas, pero falla cuando los islotes carecen   de RNAsas, as&iacute; un da&ntilde;o o una inadecuada   expresi&oacute;n de RNAsas podr&iacute;a contribuir al desencadenamiento de T1D (<a href="#fig2">Figura 2</a>) (<a href="#56">56</a>).</p>     <p align="center"><img src="img/revistas/biosa/v8n1/v8n1a17fig2.gif"><a name="fig2"></a></p>     <p>&nbsp;</p>     <p><b>RNAsa H1 Y DIABETES MELLITUS TIPO 1</b></p>     <p>Como se dijo anteriormente, RNAsa H1 se une   a h&iacute;bridos RNA-DNA, y por la homolog&iacute;a que   presenta con dominios RNAsa H de prote&iacute;nas   v&iacute;ricas, podr&iacute;a eventualmente unirse a motivos   dsRNA. Tales motivos nucleot&iacute;dicos se presentan   en la c&eacute;lula durante la infecci&oacute;n por virus   RNA, entre los que se cuentan virus coxsackie,   encefalomiocarditis, mengovirus, retrovirus,   rub&eacute;ola, etc. Todos ellos, presuntamente involucrados en el desarrollo de T1D (<a href="#57">57</a>).</p>     <p>Durante el ciclo de replicaci&oacute;n de los virus   RNA, la maquinaria de replicaci&oacute;n debe generar   hebras de RNA positivas que constituyen los   mRNA virales. Durante este proceso se forman   ssRNA (RNA de cadena sencilla) los cuales   forman estructuras terciarias para protegerse   de la acci&oacute;n de enzimas exonucleasas. Sin   embargo, esos motivos nucleot&iacute;dicos pensados   como ssRNA podr&iacute;an ser reconocidos de esta   forma como dsRNA en los tallos inmediatos a   los bucles formados dentro de la estructura del RNA, por la RNAsa H1.</p>     <p>Durante el ciclo de los virus tambi&eacute;n se   encuentra una etapa de integraci&oacute;n en la que es   necesario que se formen h&iacute;bridos RNA-DNA.   Estos &uacute;ltimos se unen con mayor afinidad a la   prote&iacute;na en cuesti&oacute;n como lo indican muchos   de los estudios realizados hasta el momento.   As&iacute;, tenemos dos presuntos substratos de la   RNAsa H1, que podr&iacute;an estar iniciando una   respuesta autoinmune descontrolada al estar   ella participando en una v&iacute;a similar a la del   sistema 2,5A/RNAsa L, a&uacute;n no conocida en la   respuesta antiviral. Bajo condiciones normales   se podr&iacute;a presumir que durante una infecci&oacute;n   viral, la respuesta antiviral dentro de la c&eacute;lula   hu&eacute;sped se activa y con ella la RNAsa H1.   Esta prote&iacute;na detectar&iacute;a motivos nucleot&iacute;dicos   ssRNA o h&iacute;bridos RNA-DNA que se encuentran   en la c&eacute;lula en concentraciones an&oacute;malas,   degrad&aacute;ndolos e inhibiendo la replicaci&oacute;n del   virus y su posterior encapsulaci&oacute;n. Este es un   mecanismo utilizado por la c&eacute;lula para impedir la   infecci&oacute;n de c&eacute;lulas vecinas, que posteriormente   terminar&aacute; en un proceso de apoptosis (<a href="#59">59</a>). Sin   embargo, cuando la RNAsa H1 no es activa,   por diferentes eventos mutacionales, los ssRNA   y los h&iacute;bridos RNA-DNA no se degradar&iacute;an   con la misma eficiencia con la que lo har&iacute;an   en presencia de una RNAsa H1 normal, as&iacute; los   niveles de estos motivos nucleot&iacute;dicos aumentan   y son detectados por receptores TLR 3, 4 y 5   que activar&iacute;an la respuesta inmune llevando a   un proceso de inflamaci&oacute;n, y posteriormente   desarrollando una fuerte respuesta autoinmune   que terminar&iacute;a destruyendo las c&eacute;lulas del   tejido infectado. Por otro lado, el progreso de la   misma infecci&oacute;n y la destrucci&oacute;n de las c&eacute;lulas   por estar frente a una respuesta antiviral d&eacute;bil,   har&iacute;a que el tejido se destruyera, generando   los mismos efectos que se presentaron durante   la respuesta autoinmune, pero esta vez por la infecci&oacute;n misma.</p>     ]]></body>
<body><![CDATA[<p>La experiencia nos habla de genes insospechados   con grandes efectos en varias enfermedades   complejas (<a href="#56">56</a>) y podr&iacute;amos estar frente a   uno de ellos. No podemos olvidarnos de las   intricadas redes g&eacute;nicas implicadas en todos   los procesos fisiol&oacute;gicos y todos los factores   tanto gen&eacute;ticos como ambientales que pueden   estar influenciando la expresi&oacute;n de un rasgo y   que podr&iacute;an pasar desapercibidas por no ser lo suficientemente obvias.</p>     <p>&nbsp;</p>     <p><b>REFERENCIAS</b></p>     <!-- ref --><p><a name="1">1</a>. Kyvik KO, Green A, Beck-Nielsen H. Concordance rates of insulin dependent diabetes mellitus: a   population based study of young Danish twins. 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