<?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>0122-9354</journal-id>
<journal-title><![CDATA[Revista de Medicina Veterinaria]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Med. Vet.]]></abbrev-journal-title>
<issn>0122-9354</issn>
<publisher>
<publisher-name><![CDATA[Universidad de La Salle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-93542013000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Características, ventajas y desventajas de la hibridización in situ para la identificación de agentes patógenos]]></article-title>
<article-title xml:lang="en"><![CDATA[Features, Advantages and Disadvantages of in situ Hybridization to Identify Pathogenic Agents]]></article-title>
<article-title xml:lang="pt"><![CDATA[Características, vantagens e desvantagens da hibridização in situ para identificar agentes patogênicos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Franco Mesa]]></surname>
<given-names><![CDATA[Martha Lilia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de La Salle  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2013</year>
</pub-date>
<numero>25</numero>
<fpage>63</fpage>
<lpage>78</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-93542013000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-93542013000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-93542013000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La citogenética molecular y los métodos de hibridización in situ (HIS) han revolucionado la comprensión de la estructura, función, organización y evolución de los genes y el genoma, además de permitir identificar la presencia y expresión de agentes patógenos dentro de las células afectadas. La HIS es una técnica que combina la biología molecular y las técnicas de histoquímica para estudiar la expresión de genes en secciones de tejido y preparados citológicos, de tal manera que el ADN o el ARN puedan localizarse rápidamente en una célula específica. La HIS localiza la secuencia específica de un gen in situ y visualiza el producto de la expresión de dicho gen preservando al tiempo la integridad de la célula dentro del tejido que la rodea, lo cual permite dictar interpretaciones anatómicas significativas. Esta técnica es el resultado de una reacción en la cual una sonda marcada se une a una secuencia de ácido nucleico complementarias entre sí. Los métodos de HIS son aplicables en investigación clínica y en patología diagnóstica, siendo muy utilizados para buscar expresión de genes cromosomales o para detectar la presencia de bacterias o virus en tejidos infectados, ya que permiten diferenciar los agentes contaminantes de los verdaderos agentes patógenos en un proceso infeccioso.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Molecular cytogenetics and in situ hybridization (ISH) methods have revolutionized the understanding of the structure, function, organization and evolution of genes and genomes, and allow identifying the presence and expression of pathogens within the affected cells. ISH is a technique that combines molecular biology and histochemical techniques to study gene expression in tissue sections and cytological preparations, so that the DNA or RNA can be quickly located in a specific cell. ISH locates the specific sequence of an in situ gene and displays the result of the expression of said gene while preserving the integrity of the cell in the surrounding tissue, which allows for significant anatomical interpretations. This technique is the result of a reaction in which a labeled probe binds to a nucleic acid sequence, which is complementary. ISH methods are applicable in clinical research and diagnostic pathology, being widely used to search for chromosomal gene expression or to detect the presence of bacteria or viruses in infected tissues, as it makes it possible to differentiate pollutants from real pathogens in an infectious process.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A citogenética molecular e os métodos de hibridização in situ (HIS) têm revolucionado a compreensão da estrutura, função, organização e evolução dos genes e o genoma, além de que permite identificar a presença e expressão de agentes patógenos dentro das células afetadas. A HIS é uma técnica que combina a biologia molecular e as técnicas de histoquímica para estudar a expressão de genes em seções de tecido e preparos citológicos, de tal modo que o ADN ou o ARN possam localizar-se rapidamente em uma célula específica. A HIS localiza a sequência específica de um gene in situ e visualiza o produto da expressão deste gene preservando ao mesmo tempo a integridade da célula dentro do tecido que a rodeia, o que permite ditar interpretações anatômicas significativas. Esta técnica é o resultado de uma reação na qual uma sonda marcada se une a uma sequência de ácido nucleico complementares entre si. Os métodos de HIS são aplicáveis em pesquisa clínica e em patologia diagnóstica, sendo muito utilizados para buscar expressão de genes cromossômicos ou para detectar a presença de bactérias ou vírus em tecidos infectados, já que permite diferenciar os agentes contaminantes dos verdadeiros agentes patogênicos em um processo infeccioso.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ADN]]></kwd>
<kwd lng="es"><![CDATA[ARN]]></kwd>
<kwd lng="es"><![CDATA[hibridización in situ]]></kwd>
<kwd lng="es"><![CDATA[sondas]]></kwd>
<kwd lng="en"><![CDATA[DNA]]></kwd>
<kwd lng="en"><![CDATA[RNA in situ hybridization]]></kwd>
<kwd lng="en"><![CDATA[probes]]></kwd>
<kwd lng="pt"><![CDATA[ADN]]></kwd>
<kwd lng="pt"><![CDATA[ARN]]></kwd>
<kwd lng="pt"><![CDATA[hibridização in situ]]></kwd>
<kwd lng="pt"><![CDATA[sondas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font face="verdana" size="2">      <br>    <p align="center"><font size="4"><b>Caracter&iacute;sticas, ventajas y desventajas    <br> de la hibridizaci&oacute;n <i>in situ </i>para la identificaci&oacute;n    <br> de agentes pat&oacute;genos</b></font></p>      <p align="justify">Martha Lilia Franco Mesa<a name="nota1"></a><a href="#nota_1"><sup>1</sup></a>       <p align="justify"><sup><a name="nota_1"></a><a href="#nota1">1</a></sup> M&eacute;dica veterinaria, Universidad de La Salle, Bogot&aacute;, Colombia. MSc (C) en Salud Animal, Universidad Nacional de Colombia. Investigadora del Grupo de Patobiolog&iacute;a Veterinaria, Universidad Nacional de Colombia. Subgerente del Centro Especializado de Diagn&oacute;stico Veterinario-Microvet.    <br> <a href="mailto:marthafra@hotmail.com">marthafra@hotmail.com</a></p>      <p align="justify"><b>Recibido</b>: 10 de diciembre de 2012. <b>Aceptado</b>: 19 de marzo de 2013</p>  <hr>  <font size="3">     <br>    ]]></body>
<body><![CDATA[<p align="justify"><b>Resumen</b></p></font>      <p align="justify">La citogen&eacute;tica molecular y los m&eacute;todos de hibridizaci&oacute;n <i>in situ </i>(HIS) han revolucionado la comprensi&oacute;n de la estructura, funci&oacute;n, organizaci&oacute;n y evoluci&oacute;n de los genes y el genoma, adem&aacute;s de permitir identificar la presencia y expresi&oacute;n de agentes pat&oacute;genos dentro de las c&eacute;lulas afectadas. La HIS es una t&eacute;cnica que combina la biolog&iacute;a molecular y las t&eacute;cnicas de histoqu&iacute;mica para estudiar la expresi&oacute;n de genes en secciones de tejido y preparados citol&oacute;gicos, de tal manera que el ADN o el ARN puedan localizarse r&aacute;pidamente en una c&eacute;lula espec&iacute;fica. La HIS localiza la secuencia espec&iacute;fica de un gen <i>in situ </i>y visualiza el producto de la expresi&oacute;n de dicho gen preservando al tiempo la integridad de la c&eacute;lula dentro del tejido que la rodea, lo cual permite dictar interpretaciones anat&oacute;micas significativas. Esta t&eacute;cnica es el resultado de una reacci&oacute;n en la cual una sonda marcada se une a una secuencia de &aacute;cido nucleico complementarias entre s&iacute;. Los m&eacute;todos de HIS son aplicables en investigaci&oacute;n cl&iacute;nica y en patolog&iacute;a diagn&oacute;stica, siendo muy utilizados para buscar expresi&oacute;n de genes cromosomales o para detectar la presencia de bacterias o virus en tejidos infectados, ya que permiten diferenciar los agentes contaminantes de los verdaderos agentes pat&oacute;genos en un proceso infeccioso.</p>      <p align="justify"><b>Palabras clave: </b>ADN, ARN, hibridizaci&oacute;n <i>in situ, </i>sondas.</p>  <hr>      <br>    <p align="center"><font size="3"><b>Features, Advantages and Disadvantages of in situ    <br> Hybridization to Identify Pathogenic Agents</b></font></p>  <font size="3">     <p align="justify"><b>Abstract</b></p></font>      <p align="justify">Molecular cytogenetics and <i>in situ </i>hybridization (ISH) methods have revolutionized the understanding of the structure, function, organization and evolution of genes and genomes, and allow identifying the presence and expression of pathogens within the affected cells. ISH is a technique that combines molecular biology and histochemical techniques to study gene expression in tissue sections and cytological preparations, so that the DNA or RNA can be quickly located in a specific cell. ISH locates the specific sequence of an <i>in situ </i>gene and displays the result of the expression of said gene while preserving the integrity of the cell in the surrounding tissue, which allows for significant anatomical interpretations. This technique is the result of a reaction in which a labeled probe binds to a nucleic acid sequence, which is complementary. ISH methods are applicable in clinical research and diagnostic pathology, being widely used to search for chromosomal gene expression or to detect the presence of bacteria or viruses in infected tissues, as it makes it possible to differentiate pollutants from real pathogens in an infectious process</p>      <p align="justify"><b>Keywords: </b>DNA, RNA <i>in situ </i>hybridization, probes.</p>  <hr>      <br>    ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b>Caracter&iacute;sticas, vantagens e desvantagens da hibridiza&ccedil;&atilde;o    <br> <i>in situ </i>para identificar agentes patog&ecirc;nicos</b></font></p>  <font size="3">     <p align="justify"><b>Resumo</b></p></font>      <p align="justify">A citogen&eacute;tica molecular e os m&eacute;todos de hibridiza&ccedil;&atilde;o <i>in situ </i>(HIS) t&ecirc;m revolucionado a compreens&atilde;o da estrutura, fun&ccedil;&atilde;o, organiza&ccedil;&atilde;o e evolu&ccedil;&atilde;o dos genes e o genoma, al&eacute;m de que permite identificar a presen&ccedil;a e express&atilde;o de agentes pat&oacute;genos dentro das c&eacute;lulas afetadas. A HIS &eacute; uma t&eacute;cnica que combina a biologia molecular e as t&eacute;cnicas de histoqu&iacute;mica para estudar a express&atilde;o de genes em se&ccedil;&otilde;es de tecido e preparos citol&oacute;gicos, de tal modo que o ADN ou o ARN possam localizar-se rapidamente em uma c&eacute;lula espec&iacute;fica. A HIS localiza a sequ&ecirc;ncia espec&iacute;fica de um gene <i>in situ </i>e visualiza o produto da express&atilde;o deste gene preservando ao mesmo tempo a integridade da c&eacute;lula dentro do tecido que a rodeia, o que permite ditar interpreta&ccedil;&otilde;es anat&ocirc;micas significativas. Esta t&eacute;cnica &eacute; o resultado de uma rea&ccedil;&atilde;o na qual uma sonda marcada se une a uma sequ&ecirc;ncia de &aacute;cido nucleico complementares entre si. Os m&eacute;todos de HIS s&atilde;o aplic&aacute;veis em pesquisa cl&iacute;nica e em patologia diagn&oacute;stica, sendo muito utilizados para buscar express&atilde;o de genes cromoss&ocirc;micos ou para detectar a presen&ccedil;a de bact&eacute;rias ou v&iacute;rus em tecidos infectados, j&aacute; que permite diferenciar os agentes contaminantes dos verdadeiros agentes patog&ecirc;nicos em um processo infeccioso.</p>      <p align="justify"><b>Palavras chave: </b>ADN, ARN, hibridiza&ccedil;&atilde;o <i>in situ, </i>sondas.</p>  <hr>  <font size="3">     <br>    <p align="justify"><b>INTRODUCCI&Oacute;N</b></p></font>      <p align="justify">La hibridizaci&oacute;n <i>in situ </i>(HIS) se realiz&oacute; por primera vez en 1969 usando ARN 28S o ADN radiomarcado, que hibridiza preparados citol&oacute;gicos de oocitos de <i>Xenopus </i>y fuera detectado por medio de microautorradiograf&iacute;a; esta t&eacute;cnica permiti&oacute; desde ese momento examinar secuencias de &aacute;cidos nucleicos dentro de las c&eacute;lulas sin alterar su morfolog&iacute;a o la integridad de sus componentes. A trav&eacute;s de los a&ntilde;os la t&eacute;cnica ha sido modificada para estudios de evoluci&oacute;n cromosomal, estudios moleculares de tumores y leucemias, y estudios citogen&eacute;ticos en una gran variedad de especies. En 1988 se dise&ntilde;&oacute; la primera sonda para la detecci&oacute;n microsc&oacute;pica de bacterias; recientemente el desarrollo de sondas noisot&oacute;picas ha generado una gran expansi&oacute;n en el uso de HIS para diagn&oacute;stico cl&iacute;nico que permite identificar la expresi&oacute;n de genes oncol&oacute;gicos y la presencia de agentes pat&oacute;genos infecciosos como virus, bacterias, hongos y par&aacute;sitos (1, 2).</p>      <p align="justify">La hibridizaci&oacute;n involucra el apareamiento de hebras complementarias de &aacute;cidos nucleicos (ADN o ARN). Esta reacci&oacute;n es reversible y las hebras h&iacute;bridas pueden ser separadas mediante tratamientos con calor o sustancias alcalinas para interrumpir los puentes de hidr&oacute;geno que se forman entre las bases nitrogenadas complementarias. Esta es una de las herramientas m&aacute;s importantes en el an&aacute;lisis molecular; si se adiciona un marcador a una de las hebras de &aacute;cido nucleico, puede ser utilizada como sonda para el an&aacute;lisis de HIS, que permite la visualizaci&oacute;n de las se&ntilde;ales hibridizadas por medio de m&eacute;todos isotr&oacute;picos o colorim&eacute;tricos. La principal ventaja de los m&eacute;todos de HIS incluye la especificidad por c&eacute;lulas individuales en un tejido heterog&eacute;neo o una poblaci&oacute;n celular, y su alta sensibilidad para determinar la expresi&oacute;n, incluso a bajo nivel, de un gen espec&iacute;fico en c&eacute;lulas o en mapeo gen&eacute;tico cromosomal. La sensibilidad de HIS no depende tanto de la especie animal sino del tipo de tejido que se va a investigar, teniendo en cuenta su obtenci&oacute;n, fijaci&oacute;n y tratamiento (1-5).</p>      <p align="justify">Este art&iacute;culo de revisi&oacute;n se enfoca en las bases generales de la t&eacute;cnica de HIS y muestra las ventajas y desventajas de su uso para la identificaci&oacute;n de agentes pat&oacute;genos en diagn&oacute;stico cl&iacute;nico o en investigaci&oacute;n veterinaria.</p>  <font size="3">     ]]></body>
<body><![CDATA[<br>    <p align="justify"><b>SONDAS</b></p></font>      <p align="justify">Una sonda es un &aacute;cido nucleico (ADN o ARN) cuya secuencia de nucle&oacute;tidos es complementaria a la del &aacute;cido nucleico de inter&eacute;s (6). Cualquier fuente de ADN o ARN puede ser utilizada para obtener sondas de HIS. La HIS de ADN aporta informaci&oacute;n acerca de la organizaci&oacute;n, localizaci&oacute;n, distribuci&oacute;n, n&uacute;mero de copias, cambios evolutivos y mezclas con otras secuencias de &aacute;cidos nucleicos, mientras que la HIS de ARN aporta informaci&oacute;n acerca de la localizaci&oacute;n y el grado de expresi&oacute;n de un gen en particular (7). Se deben tener en cuenta varios factores para elegir las sondas de HIS, entre ellos se tienen la especificidad y sensibilidad, facilidad en la penetraci&oacute;n de los tejidos, estabilidad de los h&iacute;bridos y repetitividad de la t&eacute;cnica (8).</p>  <font size="3">     <br>    <p align="justify"><b>TIPOS DE SONDAS</b></p></font>  <font size="3">     <p><b>Sondas ADN</b></p></font>      <p align="justify">Las sondas de ADN pueden generarse por: a) vectores de clonaci&oacute;n, en donde los clones tienen una porci&oacute;n del ADN de un organismo determinado; b) amplificaci&oacute;n de secuencias espec&iacute;ficas de ADN mediante una reacci&oacute;n en cadena de la polimerasa (PCR) utilizando un ADN molde y los <i>primers </i>o cebadores apropiados, y c) a partir de ADN gen&oacute;mico aislado del n&uacute;cleo de un organismo; estas sondas se utilizan en investigaci&oacute;n viral, bacteriana o gen&oacute;mica (1, 2, 7, 9-15).</p>  <font size="3">     <p align="justify"><b>Sondas ARN</b></p></font>      <p align="justify">Las ribosondas se obtienen mediante un proceso de transcripci&oacute;n <i>in vitro </i>a partir de un ADN molde linear que incorpora nucle&oacute;tidos marcados. Son de una sola hebra y m&aacute;s susceptibles a la degradaci&oacute;n por acci&oacute;n de ARNsas; sin embargo, las sondas ARNc tienen la ventaja de tener h&iacute;bridos ARN-ARN m&aacute;s estables que los ADN-ADN o los ADN-ARN (7, 12, 16-20).</p>  <font size="3">     <p align="justify"><b>Sondas de oligonucle&oacute;tidos</b></p></font>      ]]></body>
<body><![CDATA[<p align="justify">Las sondas de oligonucle&oacute;tidos est&aacute;n compuestas por 20 a 50 bases que pueden ser generadas con un sintetizador de ADN autom&aacute;tico. Estas sondas penetran las c&eacute;lulas m&aacute;s r&aacute;pidamente y generan excelentes se&ntilde;ales de hibridizaci&oacute;n (10, 21-27).</p>  <font size="3">     <br>    <p align="justify"><b>MARCADORES Y DETECCI&Oacute;N DE LA SEÑAL</b></p></font>      <p align="justify">Para la HIS los nucle&oacute;tidos en las sondas tienen que ser modificados o marcados para que se hagan evidentes despu&eacute;s del proceso de hibridizaci&oacute;n con el material gen&eacute;tico de inter&eacute;s (1, 7).</p>  <font size="3">     <p align="justify"><b>Marcadores radiois&oacute;topos</b></p></font>      <p align="justify">Es la forma m&aacute;s tradicional de HIS por ser la m&aacute;s sensible; las desventajas de estas sondas incluyen una vida media corta, peligro biol&oacute;gico, y el hecho de que toman un largo tiempo en el proceso para obtener resultados (1, 7, 27-30).</p>  <font size="3">     <p align="justify"><b>Marcadores noisot&oacute;picos</b></p></font>      <p align="justify">Las ventajas de este m&eacute;todo son una mayor estabilidad de las sondas marcadas, resultados r&aacute;pidos y una mejor resoluci&oacute;n. Las sustancias m&aacute;s utilizadas en los protocolos de HIS son la biotina (vitamina H) para marcar la sonda y su afinidad con la avidina o la estreptavidina para detectar los sitios de hibridizaci&oacute;n; tambi&eacute;n se utilizan com&uacute;nmente la digoxigenina (un esteroide de la <i>Digitalis purpurea) </i>y la fluoresce&iacute;na (FITC), que son muy f&aacute;ciles de detectar en los tejidos (1, 2, 7, 8, 31-34). Las sondas marcadas con digoxigenina tienen una mayor sensibilidad y menos marcaci&oacute;n inespec&iacute;fica de fondo que las biotiniladas, adem&aacute;s no existe en los tejidos animales (2, 35, 36). Las sondas noisot&oacute;picas se consideran menos sensibles que las radiactivas por lo que los resultados de hibridizaci&oacute;n son dif&iacute;ciles de cuantificar (1).</p>  <font size="3">     <br>    <p align="justify"><b>SEVERIDAD</b></p></font>      ]]></body>
<body><![CDATA[<p align="justify">La hibridizaci&oacute;n entre la sonda marcada y el ADN o ARN blanco se consigue mediante puentes de hidr&oacute;geno e interacciones hidrof&oacute;bicas en equilibrio. La homolog&iacute;a entre la sonda (&aacute;cido nucleico marcado) y el blanco (por ejemplo, ADN cromosomal o ARN celular) que se requiere para que se forme una mol&eacute;cula h&iacute;brida (doble h&eacute;lice) y se mantenga estable se calcula utilizando la temperatura de fusi&oacute;n T<sub>m</sub>, del ADN o del ARN, que hace referencia al punto en el cual el 50% de las dobles cadenas de &aacute;cido nucleico se separan; es decir, la temperatura en la cual las mol&eacute;culas de doble cadena y de una sola hebra son equivalentemente estables. La HIS generalmente se lleva a cabo en un rango entre 70% (baja severidad) hasta 90% (alta severidad) (1, 7) y se ve afectada por varios factores como la concentraci&oacute;n de cationes monovalentes, formamida, naturaleza de la sonda y el blanco, pH, longitud de los fragmentos de la sonda y el contenido de guanina y citocina (1, 2, 7, 37, 38).</p>  <font size="3">     <br>    <p align="justify"><b>PREPARACI&Oacute;N Y FIJACI&Oacute;N DE TEJIDOS</b></p></font>      <p align="justify">La HIS es aplicable en c&eacute;lulas (frotis, centrifugados), secciones de tejidos (congelados, embebidos en parafina, semidelgados, en cortes ultradelgados de pl&aacute;stico) y en montajes de embriones frescos o de archivo (1, 2, 7). El material embebido en parafina presenta una excelente preservaci&oacute;n en la estructura de los tejidos y permite un estudio morfol&oacute;gico tridimensional del mismo, adem&aacute;s se pueden tomar varias muestras al tiempo para utilizar diferentes coloraciones y tipos de sonda (2, 7, 9, 21, 36, 39, 40). La fijaci&oacute;n ideal para HIS debe preservar tanto el ARN como el ADN y la morfolog&iacute;a de los tejidos, adem&aacute;s debe permitir la penetraci&oacute;n de las sondas. Por regla general la fijaci&oacute;n no debe ser superior a 24 horas, incluso 15 a 60 min son suficientes para secciones de tejido delgadas (1, 2, 7, 37). Hay varios pasos que se deben seguir antes de la hibridizaci&oacute;n para aumentar su eficiencia y eliminar la marcaci&oacute;n no espec&iacute;fica de fondo. Estos son (<a href="img/revistas/rmv/n25/n25a06f01.jpg" target="_blank">figura 1</a>):</p>      <p align="justify"><i>Tratamientos con proteasas. </i>El tratamiento con proteasas y en especial la proteinasa K es el paso m&aacute;s importante para incrementar la disponibilidad de los &aacute;cidos nucleicos de inter&eacute;s, especialmente en el caso de tejidos embebidos en parafina tratados con sondas noisot&oacute;picas, adem&aacute;s ayudan a remover prote&iacute;nas que incrementan marcaciones de fondo indeseables (2, 7, 41, 42).</p>      <p align="justify"><i>Detergentes o &aacute;cidos. </i>La hidr&oacute;lisis con &aacute;cidos d&eacute;biles y una incubaci&oacute;n en una soluci&oacute;n con detergentes aumentan el acceso de la sonda a las secuencias del &aacute;cido nucleico blanco (7, 43).</p>      <p align="justify"><i>Pretratamiento con microondas. </i>Esta t&eacute;cnica incrementa la sensibilidad de la HIS, es especialmente &uacute;til para tejidos de archivo embebidos en parafina (21, 39, 41-43).</p>      <p align="justify"><i>Tratamientos de acetilaci&oacute;n. </i>La acetilaci&oacute;n de los tejidos reduce la uni&oacute;n electrost&aacute;tica de la sonda a los tejidos mediante la acetilaci&oacute;n de los grupos aminos con cargas positivas y previene la uni&oacute;n inespec&iacute;fica de la sonda a las l&aacute;minas cargadas positivamente o cubiertas con poly-L-lysina (1, 2, 7).</p>  <font size="3">     <br>    <p align="justify"><b>FIJACI&Oacute;N DE LOS TEJIDOS</b></p></font>      ]]></body>
<body><![CDATA[<p align="justify">La marcaci&oacute;n de los &aacute;cidos nucleicos celulares por medio de HIS requiere una muy buena preservaci&oacute;n de las mol&eacute;culas blanco dentro del tejido permitiendo al mismo tiempo un m&aacute;ximo acceso de la sonda a las secuencias espec&iacute;ficas que se buscan dentro de las c&eacute;lulas individuales; sin embargo, este proceso dificulta el acceso de la sonda al &aacute;cido nucleico, especialmente si el proceso de fijaci&oacute;n es prolongado (21, 39, 44, 45). Es necesario evaluar los mecanismos de acci&oacute;n as&iacute; como las ventajas y desventajas de cada producto para elegir el apropiado de acuerdo al uso que se le va a dar a un tejido en particular.</p>  <font size="3">     <p align="justify"><b>Formaldeh&iacute;do</b></p></font>      <p align="justify">La formalina bufferada al 10 % es el fijador m&aacute;s utilizado ya que preserva un gran rango de tejidos y sus componentes; no obstante, se ha probado que incluso un tratamiento corto con este fijador reduce significativamente la solubilidad del ADN o ARN (21, 39, 45-48). El formaldeh&iacute;do inicia la desnaturalizaci&oacute;n del &aacute;cido nucleico creando sitios para la interacci&oacute;n qu&iacute;mica y estableciendo as&iacute; alteraciones y uniones eslabonadas que pueden da&ntilde;ar el &aacute;cido nucleico y hacerlo inaccesible, particularmente si se realiza a temperatura ambiente. Hay que recordar que si el tiempo de fijaci&oacute;n es prolongado mayores ser&aacute;n los efectos adversos sobre el ADN tisular; en general, se recomienda una duraci&oacute;n de 3 a 6 horas usando formalina buferada al 10% fr&iacute;a (4 &deg;C) (46, 49, 50).</p>  <font size="3">     <p align="justify"><b>Glutaraldeh&iacute;do</b></p></font>      <p align="justify">Al igual que el formaldeh&iacute;do forma enlaces eslabonados entre prote&iacute;nas para proteger la integridad de los tejidos; es generalmente usado para microscop&iacute;a electr&oacute;nica ya que su baja penetraci&oacute;n y necesidad de renovaci&oacute;n constante lo limitan como fijador biol&oacute;gico. Sin embargo, se ha demostrado que el glutaraldeh&iacute;do a pH 7,0 tiene una mejor preservaci&oacute;n del ADN de alto peso molecular que la formalina bufferada al 10 % (48).</p>  <font size="3">     <p align="justify"><b>Etanol y metanol</b></p></font>      <p align="justify">Los fijadores que no generan enlaces eslabonados son mejores que los aldeh&iacute;dos para preservar &aacute;cidos nucleicos, el etanol y el metanol al 100 % no generan cambios qu&iacute;micos, son de bajo peso molecular y penetran r&aacute;pidamente en los tejidos, lo cual contribuye a una fijaci&oacute;n uniforme y una m&iacute;nima p&eacute;rdida de los componentes tisulares (48).</p>  <font size="3">     <br>    <p align="justify"><b>HIBRIDIZACI&Oacute;N</b></p></font>      <p align="justify">La hibridizaci&oacute;n propiamente dicha consiste en la uni&oacute;n de la sonda con la diana.</p>  <font size="3">     ]]></body>
<body><![CDATA[<p align="justify"><b>Prehibridizaci&oacute;n</b></p></font>      <p align="justify">Para la HIS el material es prehibridizado incub&aacute;ndolo en un <i>buffer </i>de hibridizaci&oacute;n (que no contenga la sonda) durante una o dos horas a la temperatura de hibridizaci&oacute;n, con el fin de asegurar la penetraci&oacute;n del tejido y bloquear los sitios de uni&oacute;n inespec&iacute;ficos. La ventaja de este paso es que disminuye la marcaci&oacute;n inespec&iacute;fica y la desventaja es que disminuye la sensibilidad de la t&eacute;cnica (2, 7).</p>  <font size="3">     <p align="justify"><b>Hibridizaci&oacute;n</b></p></font>      <p align="justify">Al <i>buffer </i>de prehibridizaci&oacute;n se le adiciona la sonda marcada y se incuban las l&aacute;minas en c&aacute;mara h&uacute;meda para lograr la hibridizaci&oacute;n del &aacute;cido nucleico deseado con la sonda marcada. Para obtener un acoplamiento &oacute;ptimo entre la sonda y la diana se precisan alrededor de una a dos horas para sondas biotiniladas o conjugadas con fluorocromos y hasta doce horas para sondas conjugadas con digoxigenina (51-53).</p>  <font size="3">     <p align="justify"><b>Lavados poshibridizaci&oacute;n</b></p></font>      <p align="justify">Los lavados despu&eacute;s de la hibridizaci&oacute;n remueven la sonda que no se uni&oacute; o que tiene uniones d&eacute;biles con el ADN molde o con la mezcla de hibridizaci&oacute;n; generalmente, los lavados se realizan con la misma severidad de la hibridizaci&oacute;n. Cuando se utilizan oligonucle&oacute;tidos los lavados deben ser suaves, ya que estas sondas son cortas y hay que asegurarse de que permanezcan hibridizadas al blanco (1, 2, 7, 37).</p>  <font size="3">     <p align="justify"><b>Detecci&oacute;n colorim&eacute;trica de los sitios de hibridizaci&oacute;n</b></p></font>      <p align="justify">La detecci&oacute;n de los sitios de hibridizaci&oacute;n es una parte importante de la HIS, ya que permite la visualizaci&oacute;n de los h&iacute;bridos formados entre la sonda y el blanco. Para la detecci&oacute;n de los sitios de hibridizaci&oacute;n ARN o ADN en c&eacute;lulas, tejidos o embriones se prefieren sistemas cromog&eacute;nicos mediados por enzimas que generan precipitados colorim&eacute;tricos insolubles. Anticuerpos (o avidina), conjugados a una enzima, pueden unirse a la sonda marcada ya hibridizada, y luego incubarse con un sustrato cromog&eacute;nico adecuado para la enzima. Com&uacute;nmente la enzima es la fosfatasa alcalina (PA) y se conjuga a la (estrepto) avidina, antidigoxigenina o antifluoresce&iacute;na; y el sistema de detecci&oacute;n que se usa es el NBT/BCIP (4-Nitroazul tetrazolio cloruro y 5-bromo-4-cloro-3-indoil-fosfato). Dependiendo de la abundancia del blanco que se quiere detectar la reacci&oacute;n se deja por unos minutos, horas o incluso d&iacute;as (2, 7, 54-56).</p>  <font size="3">     <p align="justify"><b>Contraste, montaje y evaluaci&oacute;n</b></p></font>      <p align="justify">Se pueden utilizar muchos protocolos de coloraci&oacute;n para identificar y contrastar los componentes celulares contra el precipitado catalizado por la enzima (p. ej. azul de toluidina, hematoxilina, eosina, verde metilo, <i>nuclear fast red, </i>safranina y giemsa). Como regla general la coloraci&oacute;n debe ser d&eacute;bil y contrastar con la se&ntilde;al de HIS. Los montajes basados en xilol pueden inducir formaci&oacute;n de cristales de NBT/BCIP, por esto se recomienda el uso de soluciones acuosas a base de glicerol, sin embargo se debe recordar que este no es un montaje permanente (2, 7, 37). La evaluaci&oacute;n y el an&aacute;lisis de las l&aacute;minas dependen de cada experimento y del m&eacute;todo de marcaci&oacute;n utilizado. La HIS puede ser evaluada por medio de microscop&iacute;a de luz, microscop&iacute;a electr&oacute;nica de transmisi&oacute;n o de barrido, epifluorescencia, microscop&iacute;a confocal, etc. (1, 19, 57, 58) (<a href="#f2">figura 2</a>).</p>      ]]></body>
<body><![CDATA[<p align="center"><a name="f2"></a><img src="img/revistas/rmv/n25/n25a06f02.jpg"></p>  <font size="3">     <br>    <p align="justify"><b>APLICACIONES DE LA HIBRIDIZACI&Oacute;N <i>IN SITU</i></b></p></font>      <p align="justify">Los m&eacute;todos de HIS son aplicables en tejidos vivos o fijados y procesados de biopsias o material de necropsia, y han demostrado ser preferibles a otras t&eacute;cnicas convencionales como la reacci&oacute;n en cadena de la polimerasa (PCR), inmunohistoqu&iacute;mica o cultivos bacterianos para el diagn&oacute;stico y la identificaci&oacute;n de agentes pat&oacute;genos (<a href="img/revistas/rmv/n25/n25a06t01.jpg" target="_blank">tabla 1</a>). En el caso de la PCR ambas t&eacute;cnicas tienen buena sensibilidad y especificidad; sin embargo, la PCR no permite identificar los microorganismos dentro del tejido lo cual limita su aplicabilidad en investigaci&oacute;n y en oncolog&iacute;a, donde se prefiere tener la ubicaci&oacute;n exacta de las c&eacute;lulas cancer&iacute;genas para un mejor tratamiento y un pron&oacute;stico m&aacute;s certero. La inmunohistoqu&iacute;mica, por su parte, permite identificar la mol&eacute;cula blanco dentro de los tejidos, pero tiene una sensibilidad m&aacute;s baja que HIS y una alta incidencia de marcaci&oacute;n inespec&iacute;fica que puede generar resultados enga&ntilde;osos; por &uacute;ltimo, los cultivos bacterianos son poco sensibles, se contaminan f&aacute;cilmente y toman varios d&iacute;as e incluso semanas para mostrar un resultado; a pesar de ser una de las t&eacute;cnicas m&aacute;s utilizadas en el diagn&oacute;stico de agentes infecciosos como bacterias u hongos, es una de las menos confiables (1, 7, 37, 59, 60). A continuaci&oacute;n se muestran algunas de las aplicaciones de HIS en el diagn&oacute;stico de agentes pat&oacute;genos.</p>  <font size="3">     <p align="justify"><b>Virus</b></p></font>      <p align="justify">En el campo de las enfermedades infecciosas la HIS ha sido muy utilizada para detectar la presencia de virus o definir la extensi&oacute;n de la infecci&oacute;n sist&eacute;mica en secciones histol&oacute;gicas o preparados citol&oacute;gicos. Anteriormente se sospechaba la presencia de un virus durante un proceso patol&oacute;gico por los s&iacute;ntomas o por efectos citop&aacute;ticos observados en l&aacute;minas histopatol&oacute;gicas, sin embargo, con esta t&eacute;cnica ahora es posible ver y confirmar la presencia de estos pat&oacute;genos en tejidos o preparados citol&oacute;gicos; ha sido especialmente usada en humanos para el diagn&oacute;stico de cytomegalovirus (CMV), papilomavirus (HPV), Eipsten-Barr virus (EBV) y herpes virus (HPV) entre otros. Para este &uacute;ltimo, HIS no solo permite identificar la presencia del virus sino tambi&eacute;n diferenciar si es un subtipo de alto o bajo riesgo (1, 6).</p>  <font size="3">     <p align="justify"><b>Bacterias</b></p></font>      <p align="justify">La HIS se ha usado para estudiar fisiolog&iacute;a bacteriana, enumerar bacterias viables y examinar biofilms (61-64). En medicina veterinaria se ha aplicado para estudiar bacterias como <i>Streptococcus suis </i>en cerdos (65), <i>Chlamydia trachomatis </i>en cerdos y ratones (66), <i>Campylobacter </i>spp. (25) <i>Haemophilus somnus </i>(67), <i>Streptococcus agalactiae, Streptococcus uberis, Arcanobacterium pyogenes </i>(68), <i>Actinobacillus pleuropneumoniae </i>(69) y <i>Listeria </i>spp. (70), <i>P. multocida </i>(12, 71, 72). En el caso del <i>Bacillus Calmette-Gu&eacute;rin </i>involucrado en el c&aacute;ncer de vejiga, la HIS, y m&aacute;s espec&iacute;ficamente FISH (Fluorescent <i>in situ </i>hybridization), no solo ayuda para el diagn&oacute;stico de la enfermedad activa, sino que ayuda a identificar pacientes en riesgo de recurrencia del tumor, mientras se llevan a cabo las inmunoterapias que permiten a combatir este tipo de c&aacute;ncer (73).</p>  <font size="3">     <p align="justify"><b>Hongos</b></p></font>      <p align="justify">La identificaci&oacute;n de hongos y levaduras en l&aacute;minas histopatol&oacute;gicas o preparados citol&oacute;gicos se basa en las caracter&iacute;sticas morfol&oacute;gicas de los organismos presentes, sin embargo, este tipo de estructuras tiende a tener una baja densidad con morfolog&iacute;as similares y se sobreponen unas a otras, es por esto que los diagn&oacute;sticos se limitan a &quot;morfolog&iacute;a consistente con... &quot;; HIS permite un excelente y r&aacute;pido m&eacute;todo diagn&oacute;stico que con certeza identifica el tipo de hongo presente en una muestra determinada sin tener que esperar m&aacute;s de un mes como en el caso de los cultivos (1).</p>  <font size="3">     ]]></body>
<body><![CDATA[<p align="justify"><b>Par&aacute;sitos</b></p></font>      <p align="justify">Hay algunos par&aacute;sitos que son dif&iacute;ciles de identificar en preparados citol&oacute;gicos o en muestras coproparasitol&oacute;gicas, es por esto que la t&eacute;cnica de HIS ha sido muy &uacute;til en el diagn&oacute;stico y estudio microbiol&oacute;gico de par&aacute;sitos como helmintos y trem&aacute;todos (1, 7), mycoplasmas (74), hemopar&aacute;sitos como la <i>Haemobartonella felis </i>en anemia infecciosa felina (15) o la <i>Babesia gibsoni </i>(33), y protozoarios como microsporidios, tripanosomas, plasmodios, trichomonas (1, 75).</p>  <font size="3">     <br>    <p align="justify"><b>VENTAJAS Y DESVENTAJAS</b></p></font>      <p align="justify">La HIS es una prueba mucho m&aacute;s sensible que otras (6, 67, 76), la principal ventaja de esta t&eacute;cnica se basa en la especificidad por c&eacute;lulas individuales manteniendo la morfolog&iacute;a del tejido, lo cual la convierte en un procedimiento ideal para investigaci&oacute;n; por otro lado, la HIS de ADN aporta informaci&oacute;n acerca de la organizaci&oacute;n, localizaci&oacute;n, distribuci&oacute;n, n&uacute;mero de copias, cambios evolutivos y mezclas con otras secuencias de &aacute;cidos nucleicos (76), mientras que la HIS del ARN aporta informaci&oacute;n acerca de la localizaci&oacute;n y el grado de expresi&oacute;n de un gen en particular (7, 12, 16, 26, 34, 37, 77-82). Sin embargo, es una t&eacute;cnica costosa que requiere de espacio, infraestructura y equipos adecuados para el trabajo con biolog&iacute;a molecular, el personal debe ser capacitado y entrenado para realizar esta t&eacute;cnica y el tiempo de estandarizaci&oacute;n puede ser prolongado (1, 81, 83).</p>  <hr>  <font size="3">     <br>    <p align="justify"><b>REFERENCIAS</b></p></font>      <!-- ref --><p align="justify">1.&nbsp;Lloyd RV. Introduction to Molecular Methods. En: Morphology Methods. Cell and Molecular Biology Techniques. New Jersey: Humana Press; 2001. p. 1-10.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000100&pid=S0122-9354201300010000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">2.&nbsp;Morel G, Cavalier A. In situ hybridization in light microscopy. 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RNA-based diagnosis in a multicellular specimen by whole mount in situ hybridization using an RNA-specific probe. Accepted Manuscript. Bioorg Med Chem &#91;Internet&#93;, 2012. Disponible en: <a href="http://dx.doi.org/10.1016/).bmc.2012.08.028" target="_blank">http://dx.doi.org/10.1016/).bmc.2012.08.028</a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000138&pid=S0122-9354201300010000600020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify">21.&nbsp;Oliver KR, Heavens RP, Sirinathsinghji DJ. Quantitative comparison of pretreatment regimens used to sensitize in situ hybridization using oligonucleotide probes on paraffin-embedded brain tissue. J Histochem Cytochem. 1997; 45: 1707-1713.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000139&pid=S0122-9354201300010000600021&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">22.&nbsp;Lloyd RV, Cano M, Chandler WF, Barkan AL, Horvath E, Kovacs K. Human growth hormone and prolactine secreting pituitary adenomas analysed by in situ hybridization. Am J Pathol. 1989; 134: 605-613.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000141&pid=S0122-9354201300010000600022&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
<body><![CDATA[<!-- ref --><p align="justify">23.&nbsp;Pagani A, Cerrato, Bussolati G. Nonspecific in situ hybridization reaction in neuroendocrin cells and tumors of the gastrointestinal tract using oligonucleotide probes. Diagn Mol Pathol. 1993; 2: 125-130.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000143&pid=S0122-9354201300010000600023&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">24.&nbsp;Stahl WL, Eakin TJ, Baskin DG. Selection of oligonucleotide probes for detection of mRNA isoforms. J Histochem Cytochem. 1993; 41: 1735-1740.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000145&pid=S0122-9354201300010000600024&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">25.&nbsp;Lehtola M, Loades C, Keevil W. Advantages of peptide nucleic acid oligonucleotides for sensitive site directed 16S rRNA fluorescence in situ hybridization (FISH) detection of Campylobacter jejuni, Campylobacter coli and Campylobacter lari. J Microbiol Meth. 2005; 62: 211-219.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000147&pid=S0122-9354201300010000600025&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">26.&nbsp;Kornreich B, Craven M, McDonough S, Nydam D, Scorza V, Assarasakorn S, et &aacute;l. Fluorescence in-situ hybridization for the identification of bacterial species in archival heart valve sections of canine bacterial endocarditis. J Comp Path. 2012; 146: 298-307.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000149&pid=S0122-9354201300010000600026&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      <!-- ref --><p align="justify">27.&nbsp;Dagerlind A, Friberg K, Bean AJ Hokfelt T. Sensitive detection using unfixed tissues: combined radioactive and nonradioactive in situ hybridization histochemistry. Histochemistry. 1992; 98: 39-43.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000151&pid=S0122-9354201300010000600027&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
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