<?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>1900-9607</journal-id>
<journal-title><![CDATA[CES Medicina Veterinaria y Zootecnia]]></journal-title>
<abbrev-journal-title><![CDATA[Ces. Med. Vet. Zootec.]]></abbrev-journal-title>
<issn>1900-9607</issn>
<publisher>
<publisher-name><![CDATA[Universidad CES]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1900-96072016000300008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Marek Disease Virus: molecular approach to the virus and host immune response]]></article-title>
<article-title xml:lang="es"><![CDATA[Virus de la Enfermedad de Marek: aproximación molecular al virus y respuesta inmune del hospedero]]></article-title>
<article-title xml:lang="pt"><![CDATA[Vírus da doença de Marek: abordagem molecular do vírus e a resposta imune do hospedeiro]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopera Toro]]></surname>
<given-names><![CDATA[Pablo Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Lecompte]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia  ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Prince Edward Island  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>11</volume>
<numero>3</numero>
<fpage>71</fpage>
<lpage>85</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1900-96072016000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1900-96072016000300008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1900-96072016000300008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Marek's disease virus affects dramatically the production of broiler chicken, hens breeding and commercial due to lost causes for carcass condemnation, presence of tumors and high mortality. Give them us derivatives by the VEM they affect significant economic losses in the poultry industry worldwide and impact the comprehensive management of poultry health and health in general. The genetic and molecular characteristics of the VEM highlight the diversity of the genome in each of the 3 serotypes of the virus; genes involved in pathogenicity, evasion of the immune response and replication strategies are consistent with the difficulty of their infection control. Viral latency and the pump of the immune response of the host, particularly the control of type I interferons, are the mechanism to help the perpetuation in the poultry and thus hamper their effective environmental control. All those conditions have allowed that the virus evolves to forms more virulent that with the use of the vaccines current does not provide a protection adequate against these; for this reason, it is necessary to reconsider current vaccination plans to improve the immune response of active type, particularly involving cell type, to control his evasion and control on the immune system.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El virus de la enfermedad de Marek afecta dramaticamente la producción de pollo de engorde, gallinas comerciales y reproductoras debido a las perdidas causas por decomisos en mataderos, presencia de tumores y alta mortalidad. Las daños derivados por el VEM repercuten en pérdidas económicas significativas en la industria avícola mundial e impactan el manejo integral de la sanidad y salud avícola en general. Las características genéticas y moleculares del VEM resaltan la diversidad genómica en cada uno de los tres serotipos del virus; genes involucrados en sus estrategias de replicación, patogenicidad y evasión de la respuesta inmune son consistentes con la dificultad del control de su infección. La latencia viral y la evación de la respuesta inmune del hospedero, particularmente el control de interferones tipo I, son los mecanismo que ayudan a la perpetuacion en las granjas avicolas y por ende dificultan su efectivo control medio ambiental. Todas esas condiciones han permitido que el virus evolucione a formas más virulentas que con el uso de las vacunas actuales no proporcionen una protección adecuada contra estas; por eso, se hace necesario replantear los planes actuales de vacunación para mejorar la respuesta inmune de tipo activo, involucrando particularmente la de tipo celular, para controlar su evasion y control sobre el sistema inmune.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O vírus da doença de Marek afeta drasticamente a produçã o de frango de engorda, galinhas poedeiras comerciais e reproduçã o devido a eles causas perdidas por convulsões em matadouros, presença de tumores e alta mortalidade. Dar-lhes nos derivados pelo VEM que afectem perdas económicas significativas na indústria avícola em todo o mundo e afetar o gerenciamento abrangente de saúde das aves e saúde em geral. As características genéticas e moleculares do VEM destacam a diversidade do genoma em cada um dos 3 sorotipos do vírus; genes envolvidos em suas estratégias de replicaçã o, patogenicidade e evasã o da resposta imune sã o consistentes com a dificuldade do controle de sua infecçã o. Latência viral e a bomba da resposta imune do hospedeiro, especialmente o controle de interferons do tipo I, sã o o mecanismo para ajudar a perpetuaçã o em aves de capoeira e, assim, dificultar o seu controle ambiental eficaz. Todas essas condições permitiram que o vírus evolui para formas mais virulentas que com o uso das vacinas atuais nã o fornece uma proteçã o adequada contra estes; por isso, é necessário faz-los repensar corrente de planos de vacinaçã o para melhorar o imune resposta do tipo ativo, envolvendo particularmente o de célula do tipo, para controlar sua evasã o e controle sobre o imunológico do sistema.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Gallid Herpesvirus 2]]></kwd>
<kwd lng="en"><![CDATA[Immune system]]></kwd>
<kwd lng="en"><![CDATA[Interferon type 1]]></kwd>
<kwd lng="en"><![CDATA[Marek's disease]]></kwd>
<kwd lng="en"><![CDATA[Viral latency]]></kwd>
<kwd lng="en"><![CDATA[Virulence]]></kwd>
<kwd lng="es"><![CDATA[Gallid Herpesvirus 2]]></kwd>
<kwd lng="es"><![CDATA[Sistema inmune]]></kwd>
<kwd lng="es"><![CDATA[Interferón tipo 1]]></kwd>
<kwd lng="es"><![CDATA[Enfermedad de Marek]]></kwd>
<kwd lng="es"><![CDATA[Latencia viral]]></kwd>
<kwd lng="es"><![CDATA[Virulencia (Recurso: MeSH)]]></kwd>
<kwd lng="pt"><![CDATA[Gallid Herpesvírus 2 sistema imune]]></kwd>
<kwd lng="pt"><![CDATA[interferã o tipo 1]]></kwd>
<kwd lng="pt"><![CDATA[doença de Marek]]></kwd>
<kwd lng="pt"><![CDATA[a latência virai]]></kwd>
<kwd lng="pt"><![CDATA[virulencia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p>Art&iacute;culo de revisi&oacute;n</p>     <p align="center"><font size="4"><b>Marek Disease Virus: molecular approach to the virus and host immune response</b></font></p>     <p align="center"><font size="3"><b><I>Virus de la Enfermedad de Marek: aproximaci&oacute;n molecular al virus y respuesta inmune del hospedero</I></b></font></p>     <p align="center"><font size="3"><b><I>V&iacute;rus da doen&ccedil;a de Marek: abordagem molecular do v&iacute;rus e a resposta imune do hospedeiro</I></b></font></p>     <p align="center">Pablo Andr&eacute;s Lopera Toro<sup>1</sup> MV, cPhD CvLAC, Juan Carlos Rodr&iacute;guez-Lecompte<sup>2</sup> PhD CvLAC</p>     <p>Para citar este art&iacute;culo: GLopera Toro PA, Rodr&iacute;guez-Lecompte JC. Virus de la Enfermedad de Marek: aproximaci&oacute;n molecular al virus y respuesta inmune del hospedero. Rev. CES Med. Zootec. 2016; Vol 11 (3): 71-85.</p>     <p><Sup>1* </Sup>Estudiante Doctorado en Ciencias Animales. Universidad de Antioquia, Facultad de Ciencias Agrarias, Medell&iacute;n, Colombia <a href="mailto:bloandreslopera@gmail.com">pabloandreslopera@gmail.com</a>    <br> <Sup>2 </Sup>Profesor Asociado en Inmunolog&iacute;a y Patolog&iacute;a Av&iacute;ar. Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, P.E.I.</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><I>(Recibido: 16 de julio de 2015. Aceptado: 27 de septiembre de 2016.)</I></p> <hr>     <p><b>Abstract</b></p>     <p>Marek's disease virus affects dramatically the production of broiler chicken, hens breeding and commercial due to lost causes for carcass condemnation, presence of tumors and high mortality. Give them us derivatives by the VEM they affect significant economic losses in the poultry industry worldwide and impact the comprehensive management of poultry health and health in general. The genetic and molecular characteristics of the VEM highlight the diversity of the genome in each of the 3 serotypes of the virus; genes involved in pathogenicity, evasion of the immune response and replication strategies are consistent with the difficulty of their infection control. Viral latency and the pump of the immune response of the host, particularly the control of type I interferons, are the mechanism to help the perpetuation in the poultry and thus hamper their effective environmental control. All those conditions have allowed that the virus evolves to forms more virulent that with the use of the vaccines current does not provide a protection adequate against these; for this reason, it is necessary to reconsider current vaccination plans to improve the immune response of active type, particularly involving cell type, to control his evasion and control on the immune system.</p>     <p><b>Keywords</b>: <I>Gallid Herpesvirus 2, Immune system, Interferon type 1, Marek's disease, Viral latency, Virulence..</I></p>  <hr>     <p><b>Resumen</b></p>     <p>El virus de la enfermedad de Marek afecta dramaticamente la producci&oacute;n de pollo de engorde, gallinas comerciales y reproductoras debido a las perdidas causas por decomisos en mataderos, presencia de tumores y alta mortalidad. Las da&ntilde;os derivados por el VEM repercuten en p&eacute;rdidas econ&oacute;micas significativas en la industria av&iacute;cola mundial e impactan el manejo integral de la sanidad y salud av&iacute;cola en general. Las caracter&iacute;sticas gen&eacute;ticas y moleculares del VEM resaltan la diversidad gen&oacute;mica en cada uno de los tres serotipos del virus; genes involucrados en sus estrategias de replicaci&oacute;n, patogenicidad y evasi&oacute;n de la respuesta inmune son consistentes con la dificultad del control de su infecci&oacute;n. La latencia viral y la evaci&oacute;n de la respuesta inmune del hospedero, particularmente el control de interferones tipo I, son los mecanismo que ayudan a la perpetuacion en las granjas avicolas y por ende dificultan su efectivo control medio ambiental. Todas esas condiciones han permitido que el virus evolucione a formas m&aacute;s virulentas que con el uso de las vacunas actuales no proporcionen una protecci&oacute;n adecuada contra estas; por eso, se hace necesario replantear los planes actuales de vacunaci&oacute;n para mejorar la respuesta inmune de tipo activo, involucrando particularmente la de tipo celular, para controlar su evasion y control sobre el sistema inmune.</p>     <p><b>Palabras clave</b>: <I>Gallid Herpesvirus 2, Sistema inmune, Interfer&oacute;n tipo 1, Enfermedad de Marek, Latencia viral, Virulencia (Recurso: MeSH).</I></p>  <hr>     <p><b>Resumo</b></p>     <p>O v&iacute;rus da doen&ccedil;a de Marek afeta drasticamente a produ&ccedil;&atilde; o de frango de engorda, galinhas poedeiras comerciais e reprodu&ccedil;&atilde; o devido a eles causas perdidas por convuls&otilde;es em matadouros, presen&ccedil;a de tumores e alta mortalidade. Dar-lhes nos derivados pelo VEM que afectem perdas econ&oacute;micas significativas na ind&uacute;stria av&iacute;cola em todo o mundo e afetar o gerenciamento abrangente de sa&uacute;de das aves e sa&uacute;de em geral. As caracter&iacute;sticas gen&eacute;ticas e moleculares do VEM destacam a diversidade do genoma em cada um dos 3 sorotipos do v&iacute;rus; genes envolvidos em suas estrat&eacute;gias de replica&ccedil;&atilde; o, patogenicidade e evas&atilde; o da resposta imune s&atilde; o consistentes com a dificuldade do controle de sua infec&ccedil;&atilde; o. Lat&ecirc;ncia viral e a bomba da resposta imune do hospedeiro, especialmente o controle de interferons do tipo I, s&atilde; o o mecanismo para ajudar a perpetua&ccedil;&atilde; o em aves de capoeira e, assim, dificultar o seu controle ambiental eficaz. Todas essas condi&ccedil;&otilde;es permitiram que o v&iacute;rus evolui para formas mais virulentas que com o uso das vacinas atuais n&atilde; o fornece uma prote&ccedil;&atilde; o adequada contra estes; por isso, &eacute; necess&aacute;rio faz-los repensar corrente de planos de vacina&ccedil;&atilde; o para melhorar o imune resposta do tipo ativo, envolvendo particularmente o de c&eacute;lula do tipo, para controlar sua evas&atilde; o e controle sobre o imunol&oacute;gico do sistema.</p>     <p><b>Palavras-chave</b>: <I>Gallid Herpesv&iacute;rus 2 sistema imune, interfer&atilde; o tipo 1, doen&ccedil;a de Marek, a lat&ecirc;ncia virai, virulencia.</I></p> <hr>      ]]></body>
<body><![CDATA[<p><b>Introducci&oacute;n </b></p>     <p>El virus de la Enfermedad de Marek (VEM) es uno de los agentes infecciosos aviares con mayor impacto en la producci&oacute;n de pollo de engorde y gallina ponedora, la Enfermedad de Marek (EM) es causada por este agente y tiene gran importancia en muchos pa&iacute;ses ya que se pueden presentar decomisos y mortalidad que afectan la econom&iacute;a de la industria av&iacute;cola 30</p>     <p>Las caracter&iacute;sticas gen&eacute;ticas y moleculares del VEM han sido evaluadas y documentadas   a trav&eacute;s publicaciones cient&iacute;ficas, las cuales reportan en consenso la diversidad   gen&eacute;tica que poseen cada uno de los serotipos del virus, las caracter&iacute;sticas   gen&eacute;ticas hacen que este virus tenga singulares estrategias en su replicaci&oacute;n, las   cuales afectan considerablemente la respuesta inmune del ave a la infecci&oacute;n y la   efectividad en controlar su infecci&oacute;n y diseminaci&oacute;n debido principalmente a la producci&oacute;n   de interferones que act&uacute;an directamente sobre la respuesta inmune innata   contra el virus 29, 30. Esto permite que el virus evolucione en el tiempo evitando su   exposici&oacute;n al sistema inmune, impidiendo su eliminaci&oacute;n del hospedero e incrementado   su patog&eacute;nesis 46, 50.</p>     <p>El objetivo de esta revisi&oacute;n es dar a conocer las diferentes caracter&iacute;sticas moleculares del virus de la enfermedad de Marek y cu&aacute;les son los genes implicados en la patog&eacute;nesis.  </p>     <p><strong>Herpesvirus</strong></p>     <p>Los herpesvirus pertenecen a la familia Herpesvirinae y est&aacute;n divididos en subfamilias   (alfa) a-herpesviridae, (beta) &beta;-herpesviridae y (gamma) ?-herpesviridae, tienen   la habilidad de establecer una infecci&oacute;n permanente en su hospedero y son ubicuos   en humanos y animales 1, 31, 41.  </p>     <p>Poseen la capacidad de generar infecciones asintom&aacute;ticas en individuos sanos, sin   embargo cuando se presenta la infecci&oacute;n cl&iacute;nica pueden causar enfermedad significativa   comprometiendo varios sistemas org&aacute;nicos de las aves y en principal instancia   el sistema inmune de las aves infectadas 1, 29.  </p>     <p>Los herpesvirus se han encontrado a trav&eacute;s del tiempo durante la coevoluci&oacute;n con   los mam&iacute;feros y han adquirido numerosos genes que codifican prote&iacute;nas con una   funci&oacute;n importante en la evasi&oacute;n de las v&iacute;as de la respuesta inmune, tal como la   activaci&oacute;n de la infecci&oacute;n por largo tiempo (latencia viral) dentro de las c&eacute;lulas del   hospedero, y la expresi&oacute;n de citoquinas quimiot&aacute;cticas capaces de activar mecanismos   con los cuales pueden infectar los linfocitos T cuando son llamados a cumplir   funciones propias de defensa en un &oacute;rgano en particular 1, 51.  </p>     <p><strong>Virus de la Enfermedad de Marek y clasificaci&oacute;n patot&iacute;pica  </strong></p>     <p>El VEM tiene propiedades linfotr&oacute;picas similares a las de los Gammaherpesvirus 2,   sin embargo, su estructura molecular y organizaci&oacute;n gen&oacute;mica son similares a los   de los Alfaherpesvirus 3, 41.  </p>     ]]></body>
<body><![CDATA[<p>El VEM tambi&eacute;n llamado Gallid Herpesvirus tipo 2 (GaHV-2) posee tres serotipos que   se diferencian por su genoma, 1) las cepas del serotipo 1 son oncog&eacute;nicas infecta   pollos y gallinas tales como la GA Md11y Md5; 2) el serotipo 2 infecta pollos y gallinas   y la cepa m&aacute;s conocida es la SB-1 y 3) el serotipo 3 Herpesvirus de Pavo (HVT),   infecta pavos. Los serotipos 2 y 3 son no oncog&eacute;nicos y no tienen capacidad patog&eacute;nica   alta como el serotipo 1 3, 35, 49, 61.  </p>     <p>Las cepas del serotipo 1 del VEM tienen la habilidad para inducir lesiones linfoproliferativas   en nervios, h&iacute;gado, ri&ntilde;&oacute;n, bazo, sistema reproductivo, coraz&oacute;n, piel y proventr&iacute;culo14.   Estas lesiones est&aacute;n influenciadas por la presencia de infiltrado linfocitario   lo que ha demostrado que a medida que la cepa se hace m&aacute;s virulenta el   infiltrado linfocitario es mayor lo que puede conducir a la atrofia del timo y la bursa;   esta caracter&iacute;stica ha servido para prever que todas estas cepas han tenido una   evoluci&oacute;n continua en el tiempo para cambiar su virulencia 30, 50, 54, 61, lo que sugiere   que los tres serotipos pueden desarrollar r&aacute;pidamente caracter&iacute;sticas biol&oacute;gicas y   moleculares alteradas, indicando que pueden existir mutaciones espont&aacute;neas en su   genoma 15, 16, 17.</p>     <p> Los cambios en la virulencia en las cepas del VEM han sido reconocidos desde 1970   y siguen progresando hasta ahora gracias a una serie de estudios sobre factores   relacionados al virus y al hospedero 14.</p>     <p>La virulencia se ha relacionado &iacute;ntimamente con la clasificaci&oacute;n patot&iacute;pica, en la cual se designan cuatro tipos de virus relacionados como medio (mVEM), virulento (vVEM), muy virulento (vvVEM) y muy virulento plus (vv+VEM), actualmente se sospecha de la presencia de patotipos que exceden la virulencia de vv+VEM y se ha informado por lo menos de una de esas cepas, la 584A 2, 18, 32, 36.</p>     <p><strong>Caracter&iacute;sticas gen&oacute;micas y prote&oacute;micas del virus de la enfermedad de Marek</strong></p>     <p>El genoma del VEM est&aacute; compuesto por una doble cadena de ADN, en su estructura   posee regiones &uacute;nicas largas (UL) y regiones &uacute;nicas cortas (US), rodeadas por regiones   invertidas repetidas largas y cortas. La longitud del genoma de cada uno de los   serotipos var&iacute;a, siendo el serotipo 1 el m&aacute;s largo 3.  </p>     <p>En la secuencia de eventos desde la entrada del virus a la c&eacute;lula hasta su salida,   describiremos los genes que est&aacute;n involucrados en estos procesos:  </p>     <p>El gen LORF4 (UL1) tiene un importante papel en la entrada del virus a la c&eacute;lula,   ya que codifica para la formaci&oacute;n de glicoprote&iacute;nas de superficie: la interacci&oacute;n del   virus con la c&eacute;lula permite que se una el complejo glicoprote&iacute;na L (gL) con la glicoprote&iacute;na   H (gH) del virus para la interacci&oacute;n con los receptores nectina 1 de la c&eacute;lula   hospedera 4, 45.  </p>     <p>Luego de la entrada del virus a la c&eacute;lula, este debe de realizar un recorrido por su   interior para llegar al n&uacute;cleo en donde se replica, pasando por el citoplasma a trav&eacute;s   de la uni&oacute;n con el citoesqueleto para luego introducir su genoma por el poro nuclear   para unirse episomalmente al genoma del hospedero, all&iacute; comienza el proceso de   transcripci&oacute;n, en estos mecanismos no son muy conocidos los genes virales que   intervienen en el transporte intracelular del virus.  </p>     <p>Despu&eacute;s del proceso de transcripci&oacute;n de genes del virus comienza la formaci&oacute;n de   prote&iacute;nas que ayudan en la transformaci&oacute;n lo que permite el desarrollo de tumores   linfoides en las aves; los genes UL39, y UL41 tienen actividad transcripcional en la   fase temprana de la infecci&oacute;n5. Se reconoce claramente a Meq como un gen importante   por su actividad oncog&eacute;nica, un hom&oacute;logo de oncogenes fos y jun, expresados   durante la infecci&oacute;n latente y cumplen un papel importante en la transformaci&oacute;n de   c&eacute;lulas T 5, 6, 51.  </p>     ]]></body>
<body><![CDATA[<p>Meq tambi&eacute;n puede bloquear la apoptosis de las c&eacute;lulas latentemente infectadas   y es transactivador de la expresi&oacute;n g&eacute;nica dependiendo de sus compa&ntilde;eros de dimerizaci&oacute;n   y sitios de uni&oacute;n del genoma del VEM 6. Otros genes virales colaboran   con el mantenimiento y difusi&oacute;n del VEM, es el caso de v-TR 7; as&iacute; como UL14 puede   funcionar en la replicaci&oacute;n del virus y la transformaci&oacute;n celular y la formaci&oacute;n de   tumores 8.  </p>     <p>En la latencia del VEM participan diferentes genes para inducir este proceso, los transcriptos   asociados a latencia (LATs) que se asignan en antisentido al gen ICP4 9, 51. La   pp38 es una fosfoprote&iacute;na que se expresa en c&eacute;lulas l&iacute;ticamente infectadas y c&eacute;lulas   tumorales, est&aacute; implicada en la reactivaci&oacute;n de la latencia viral5, 51. Otro gen implicado   en la reactivaci&oacute;n de la latencia es el gen de la ribonucle&oacute;tido reductasa (RR) el cual   tambi&eacute;n es necesario en la patog&eacute;nesis viral10, 51.</p>     <p>El gen ICP22 ha sido descrito como transactivador y desempe&ntilde;a un papel en la regulaci&oacute;n   g&eacute;nica post-transcripcional inhibiendo el Splicing del virus y la c&eacute;lula hospedera 11.</p>     <p>Los genes asociados con par&aacute;lisis transitoria (TP) podr&iacute;an desempe&ntilde;ar un papel   crucial en la inducci&oacute;n de lesiones patol&oacute;gicas que se encuentran en los tejidos nerviosos   de las aves; el gen UL44 o glicoprote&iacute;na (gC) y UL13, son esenciales para la   transmisi&oacute;n horizontal 4, 5.  </p>     <p>El gen US3 codifica para una prote&iacute;na quinasa de serina/therionine y el gen UL49.5,   codifica una prote&iacute;na de envoltura/tegumento no glicosilada, ambos implicados en   la regulaci&oacute;n del Complejo Mayor de Histocompatibilidad - MHC clase I 5. El VEM   posee un gen el cual codifica una interleucina viral, la vIL8 es una quimocina CXC   implicada en la infecci&oacute;n citol&iacute;tica temprana y atracci&oacute;n celular, estos genes pueden   estar involucrados en la modulaci&oacute;n de la replicaci&oacute;n viral o respuesta inmune del   hospedero 13, 34, 43.  </p>     <p><strong>Patog&eacute;nesis de la Enfermedad de Marek  </strong></p>     <p>El ingreso al hospedero se realiza por inhalaci&oacute;n del virus, el cual se encuentra   presente en su forma libre de c&eacute;lulas en la descamaci&oacute;n de la piel y en el fol&iacute;culo   plumoso de las aves infectadas 20, 29.  </p>     <p>Una vez en el interior del ave (<a href="#f1">Figura 1</a>), el virus es transportado a los pulmones y   es capturado por los macr&oacute;fagos alveolares, transportado y transferido a linfocitos   B, posteriormente por mecanismos de presentaci&oacute;n antig&eacute;nica es transferido a los   linfocitos T, en donde comienza a replicarse y puede comenzar la transformaci&oacute;n de   las c&eacute;lulas 20, 31, 39.  </p>     <p>En los linfocitos T, el VEM puede permanecer en estado de latencia por tiempo indeterminado   hasta que ocurran cambios celulares que permitan al virus reactivar el   proceso de replicaci&oacute;n y su ciclo patog&eacute;nico 20, 51.  </p>     <p>Para que el virus entre a las c&eacute;lulas es necesario que interact&uacute;e con RabIIA la cual   pertenece a la familia de las Rab GTPasas que son mediadoras en la formaci&oacute;n de   ves&iacute;culas, tr&aacute;fico y fusi&oacute;n del virus con la membrana de la c&eacute;lula, esto permite el   transporte intracelular del VEM 20, luego la replicaci&oacute;n y al final de la cual, es excretado   en las c&eacute;lulas del fol&iacute;culo plumoso 21, permiti&eacute;ndole a el virus permanecer por   largos periodos tiempo en el ambiente bien sea en el polvo o la exfoliaci&oacute;n epitelial   (caspa) que se encuentra en los galpones y llegar eventualmente a transmitirse de   una parvada a otra dentro de las granjas.  </p>     ]]></body>
<body><![CDATA[<p>Signos cl&iacute;nicos de la Enfermedad de Marek  </p>     <p>La enfermedad de Marek comprende inmunosupresi&oacute;n, par&aacute;lisis, debilidad cr&oacute;nica   desarrollo de linfomas y ceguera, los s&iacute;ntomas var&iacute;an en severidad seg&uacute;n la cepa   del virus, el genotipo del ave y el estatus vacunal, en algunas ocasiones puede haber   muerte de las aves susceptibles o de las que no son vacunadas 61, los signos cl&iacute;nicos   caracter&iacute;sticos son polineuritis y par&aacute;lisis de las alas o las patas, inmunosupresi&oacute;n   por la colonizaci&oacute;n del virus en &oacute;rganos linfoides tales como bursa de Fabricio, timo   y bazo lo cual impide que haya una buena respuesta a la vacunaci&oacute;n contra diferentes   agentes infecciosos, pueden presentar problemas oculares debido al da&ntilde;o que   se presenta en el iris (iridociclitis) y la enfermedad neopl&aacute;sica visceral 17, 19, 29.</p> <h3>     <p align="center"><a name="f1"></a><img src="img/revistas/cmvz/v11n3/v11n3a08f1.jpg" ></h3>     <p>1. En los estadios iniciales de la infecci&oacute;n el VEM hace un tr&aacute;nsito no replicativo en macr&oacute;fagos y linfocitos B en tejido linfoide (Bolsa de Fabricio, Timo, Tejido linfoide asociado a las mucosas (MALT); 2. Se genera una reacci&oacute;n inflamatoria con la migraci&oacute;n de linfocitos T, los cuales son la c&eacute;lula blanco del VEM; 3. Las prote&iacute;nas virales estructurales gH/gL, gB, gC y gD interact&uacute;an con receptores celulares de nectina 1, lipid raft y HSPG facilitando la infecci&oacute;n; 4. La c&aacute;pside viral migra hasta los poros nucleares donde libera el &aacute;cido nucleico viral (ADN) hacia el n&uacute;cleo celular; 5. La replicaci&oacute;n viral nuclear puede activar bien sea la v&iacute;a Jack/Stat o fosfoproteinkinasa que estimula la producci&oacute;n de transcriptos de genes anti-apopt&oacute;ticos que favorecen la transformaci&oacute;n de las c&eacute;lulas T CD4; 6. La presencia del ADN viral alrededor del n&uacute;cleo (Episomal) es la forma t&iacute;pica de presencia continua del virus en la c&eacute;lula infectada conocida como latencia; esto le permite al virus reactivarse en condiciones de estr&eacute;s celular y generar nuevos viriones infecciosos que infectaran m&aacute;s c&eacute;lulas 39, 48, 51.</p>     <p><strong>Vacunaci&oacute;n contra el virus de la Enfermedad de Marek</strong></p>     <p> Desde 1970 se han implementado planes de vacunaci&oacute;n para controlar la enfermedad,   los m&eacute;todos utilizados para la inmunizaci&oacute;n de las aves se basan en la aplicaci&oacute;n   de la vacuna in ovo al d&iacute;a 18 del periodo embrionario o por v&iacute;a subcut&aacute;nea al   primer d&iacute;a de nacidas, actualmente se tienen varios esquemas de vacunaci&oacute;n dependiendo   de la condici&oacute;n geogr&aacute;fica y epidemiol&oacute;gica de la enfermedad, la vacuna   Rispens o CVI988 es la m&aacute;s efectiva contra VEM muy virulento (vv) y muy virulento   + (vv+), la vacunaci&oacute;n de aves con HVT o SB-1 tambi&eacute;n previene la EM, pero es menos   efectivo contra cepas vv y vv+ 16, 17, 22, 31, 42. La infecci&oacute;n de linfocitos B y T por los   virus vacunales interfiere con los procesos de infecci&oacute;n de VEM virulentos lo que   contribuye con un efecto protector. Otro componente ben&eacute;fico de las vacunas es la   interferencia con la infecci&oacute;n de cepas virulentas en el Epitelio del Fol&iacute;culo Plumoso   de las aves lo que resulta en una disminuci&oacute;n en la transmisi&oacute;n del virus 61. Los diferentes   manejos de las vacunas tales como la disminuci&oacute;n de la dosis a aplicar, la   diluci&oacute;n de la vacuna y la mezcla con antibi&oacute;ticos pueden determinar un efecto poco   protectivo de la vacuna en las aves 38, 17, 23.</p>     <p><strong>Respuesta inmune frente a la infecci&oacute;n por el VEM </strong></p>     <p>Los mecanismos de inmunidad celular y humoral que genera la vacunaci&oacute;n con la   cepa HVT contra VEM se manifiestan principalmente por la reducci&oacute;n de los niveles   de infecci&oacute;n latente, potencian los efectos de las c&eacute;lulas asesinas naturales (NK)   para destruir linfocitos B infectados con virus, ayudan en la producci&oacute;n de interfer&oacute;n   gamma por las NK o macr&oacute;fagos lo que genera una actividad antiviral y la producci&oacute;n   de linfocitos T citot&oacute;xicos ant&iacute;geno espec&iacute;ficos, lo que ayuda en el desarrollo   de la respuesta inmune de memoria de tipo celular, adem&aacute;s de ayudar a eliminar   c&eacute;lulas infectadas con MDV en un periodo de 3-7 d&iacute;as despu&eacute;s de la vacunaci&oacute;n 21, 37. </p>     <p>Los macr&oacute;fagos activados pueden transportar el VEM desde el sitio de infecci&oacute;n en   los pulmones a &oacute;rganos linfoides primarios y secundarios 9, los macr&oacute;fagos inhiben   la replicaci&oacute;n viral a trav&eacute;s de la producci&oacute;n de &oacute;xido n&iacute;trico (NO) lo que consecuentemente   ayuda al control viral y la reducci&oacute;n de los tumores producidos en la EM; la   respuesta de los macr&oacute;fagos es mediada o potenciada por el factor de crecimiento   mieloc&iacute;tico de las gallinas que permite incrementar la tasa de diferenciaci&oacute;n de   monocitos a macr&oacute;fagos en tejidos y el aumentar en n&uacute;mero de granulocitos (heter&oacute;filos   en aves), lo que resulta en un aumento de los procesos inflamatorios de   resoluci&oacute;n contra pat&oacute;genos mediante la fagocitosis y producci&oacute;n de NO 9, 25 </p>     <p>Las citoquinas que se forman en las c&eacute;lulas por el est&iacute;mulo e interacci&oacute;n entre c&eacute;lulas   inmunes y la presencia del virus, en primera instancia son los interferones de   tipo 1 (INF-1), IFN- ?, IFN-a e IFN- &beta;y act&uacute;an como potentes reguladores del sistema   inmune innato a trav&eacute;s del potenciamiento de las c&eacute;lulas NK citot&oacute;xicas 24 </p>     ]]></body>
<body><![CDATA[<p>Las c&eacute;lulas NK son la primera l&iacute;nea de defensa del sistema inmune innato y adquirido   para eliminar c&eacute;lulas infectadas por el virus; despu&eacute;s del reconocimiento   mediante receptores de superficie de cambios en el CMH I o del reconocimiento de   ant&iacute;genos virales mediante anticuerpos unidos a sus receptores en las NKs, estas   inician un proceso citot&oacute;xico; las c&eacute;lulas NK poseen enzimas tipo serinas y otras   proteasas que inducen la formaci&oacute;n de poros en la membrana celular y activan un   proceso enzim&aacute;tico l&iacute;tico (por medio de las perforinas y granzinas) que destruyen   c&eacute;lulas infectadas mediante apoptosis. Este proceso es importante en la respuesta   inmune de las aves ante la infecci&oacute;n con cepas muy virulentas del virus de la enfermedad de Marek 25.</p>     <p> La producci&oacute;n de CXCL14 y RANTES se expresan en c&eacute;lulas tumorales de la EM,   est&aacute;s interleucinas son reguladas en cerebro, bazo y pulmones despu&eacute;s de la infecci&oacute;n   con VEM 9. Adicionalmente, cuando hay infecci&oacute;n por cepas del VEM del   serotipo 1, en sangre se presenta un bloqueo en la inducci&oacute;n de la transcripci&oacute;n   de genes de INF al primer d&iacute;a post infecci&oacute;n generando una inmunosupresi&oacute;n relacionada   con la oncogenicidad viral 20. </p>     <p>La respuesta de CD8+ (CTL) contra varias glicoprote&iacute;nas de envoltura tiene un papel   importante en el control de la infecci&oacute;n del VEM, el fenotipo CTL expresado en   aves es determinado por la expresi&oacute;n de CD3+ CD4- CD8+ TCRaß1 igual al fenotipo   expresado por c&eacute;lulas citot&oacute;xicas cuando hay inducci&oacute;n por cepas vacunales no oncog&eacute;nicas   de VEM; este tipo de respuesta CTL tambi&eacute;n tiene un papel importante en   la resistencia gen&eacute;tica a EM ya que puede ser expresada fenot&iacute;picamente en aves   resistentes a la enfermedad debido a la reasociaci&oacute;n gen&eacute;tica al momento de formar   las c&eacute;lulas espec&iacute;ficas en la inmunidad adquirida24, 33. </p>     <p>Ha sido reconocido que la respuesta inmune de las aves contra el VEM es m&aacute;s fuerte contra cepas vacunales atenuadas del serotipo 1, que contra cepas de campo, lo que demuestra las diferencias antig&eacute;nicas del virus 10.</p>     <p> Adem&aacute;s de la respuesta por parte de las CD4+ ayudantes (Th2) que reconocen los   p&eacute;ptidos en la superficie de las c&eacute;lulas B a trav&eacute;s del CMH II, las c&eacute;lulas CD8+ citot&oacute;xicas   act&uacute;an bien sea en c&eacute;lulas infectadas con virus o c&eacute;lulas tumorales; es de   resaltar que el VEM es estrictamente asociado a c&eacute;lulas y la respuesta mediada por   anticuerpos no es considerada como la m&aacute;s importante comparada con la mediada   por c&eacute;lulas Th 25.  </p>     <p>En la respuesta inmune contra el VEM tambi&eacute;n se producen en el bazo, cerebro y   sangre citoquinas de tipo Th1(IL-2, INF- ?, IL-12, IL-15, IL-16 e IL-18) y de tipo Th2 (IL- 3, IL-4, IL-13 y Factor de Crecimiento Transformante &beta;) que pueden ser reconocidas   en la fase citol&iacute;tica temprana, latente y citol&iacute;tica tard&iacute;a y ayudan a modificar el desarrollo   tumoral en gallinas infectadas con cepas oncog&eacute;nicas altamente virulentas   del VEM 9.</p>     <p> Existe una correlaci&oacute;n positiva entre la replicaci&oacute;n del VEM en la mucosa respiratoria   y la expresi&oacute;n de TLRs lo que lleva a pensar que ciertos PAMPs derivados de la   infecci&oacute;n por VEM interact&uacute;an con los patrones de receptores reconocimiento presentes   en las en gallinas infectadas 24.</p>     <p> <strong>Genes asociados con la susceptibilidad y resistencia a la enfermedad</strong></p>     <p>Son muchos los genes de las aves de los cuales se especula que est&aacute;n relacionados   con la respuesta inmune e involucrados en la resistencia o la susceptibilidad frente   al VEM, todos son sobre-expresados durante el proceso de replicaci&oacute;n viral al interior   de la c&eacute;lula y pueden inducir la formaci&oacute;n de prote&iacute;nas que ayudan al cambio   morfol&oacute;gico de la c&eacute;lula 40, 58 (<a href="#f2">Figura 2</a>),</p> <h3>     <p align="center"><a name="f2"></a><img src="img/revistas/cmvz/v11n3/v11n3a08f2.jpg"></h3>     ]]></body>
<body><![CDATA[<p>Uno de los mayores efectos que tienen los genes asociados al virus es la de producir factores quimot&aacute;cticos de c&eacute;lulas T para poder infectarlas permitiendo que se presente la enfermedad tumoral en las aves; algunos de los genes involucrados en la resistencia al VEM son la hormona de crecimiento (GH), ant&iacute;geno 2 de c&eacute;lulas madre (SCA2) o precursor de ant&iacute;geno de Linfocito (LY6E), cadena B del complejo mayor de histocompatibilidad por medio de la reducci&oacute;n de la expresi&oacute;n de las glicoprote&iacute;nas del CMH B clase I (BLB o CD74), CD79B durante la replicaci&oacute;n l&iacute;tica viral como mecanismo de la evasi&oacute;n de la respuesta inmune, esta reducci&oacute;n en la expresi&oacute;n de las mol&eacute;culas en la superficie celular no se presenta durante la latencia, sin embargo una expresi&oacute;n gen&oacute;mica m&iacute;nima viral y la integraci&oacute;n a los tel&oacute;meros de la c&eacute;lula hospedera son suficientes para la evasi&oacute;n de la respuesta inmune 27, 47, 61. </p>     <p>Durante el proceso de defensa del hospedero contra el virus para permitir que el   sistema inmune del ave pueda montar una respuesta efectiva genes como CTLA4, Interfer&oacute;n   de tipo 1 (IFNA), Interfer&oacute;n tipo 2 (IFNG), interleucinas y receptores de interleucinas   (IL-6, IL-8, IL-13R2A e IL18)59, 60, quimoquinas proinflamatoria (CCLi7, CCL12,   CCLi6, CCLi3, CCL17 y CCL19), respuesta factor regulatorio de interfer&oacute;n (IRF1, IFIH,   IFIT-Like), &oacute;xido n&iacute;trico sintetasa inducible (NOS2A), Prote&iacute;na espec&iacute;fica de quiescencia   (P20K), proteasa proinflamatoria granzina A (GZMA), receptor TLR3, TLR1B,   TLR15 y TLR21, Lisozimas (LYG2), avidina (AVD), IRG1, MDV1, genes mitocondriales   que codifican fosfoenolpiruvato carboxiquinasa, NADH deshidrogenasa subunidad   4, concavalina A, factor de mantenimiento de la latencia (LMF) act&uacute;an durante el   proceso de defensa contra el virus y los efectos citop&aacute;ticos sobre las c&eacute;lulas hospederas 19, 56, 58.</p>     <p> El virus de la enfermedad de Marek entra a la c&eacute;lula y es transportado al n&uacute;cleo   en donde el genoma viral se une al genoma celular en las zonas episomales de los   cromosomas (pasos 1, 2 ,3 y 4) 5. Representa la transcripci&oacute;n del DNA viral, 6. Representa   los genes virales gC, 132 bp, pp38, pp14, Meq, ICP4, vIL-8, LAT y vTR, estos   genes est&aacute;n involucrados en los cambios morfol&oacute;gicos de los linfocitos T, la oncog&eacute;nesis viral y la latencia viral</p>     <p> La hip&oacute;tesis por la cual algunos de los genes activados generan resistencia a la   EM en las aves se debe a: 1) la expresi&oacute;n de los genes puede causar p&eacute;rdida de la   capacidad receptor del VEM para unirse a las c&eacute;lulas; 2) Las c&eacute;lulas NK ayudan a   eliminar las c&eacute;lulas infectadas, 3) afectar el ciclo de vida del virus y 4) prevenir la   transformaci&oacute;n de c&eacute;lulas infectadas 24, 25, 28. </p>     <p>Los genes asociados a susceptibilidad a la EM tales como: IgG-H, Beta defensinas   (AvBD1, AvBD2 y AvBD4), genes de matriz de metaloprote&iacute;nas (MMP2, MMP7   y MMP13), lectinas y colectinas (CLEC3B, COLEC10 y COLEC12), receptores de   quimoquinas (CCR6), mol&eacute;culas de adhesi&oacute;n AMIGO2, mol&eacute;culas de superficie   de c&eacute;lulas dendr&iacute;ticas &#91;TIM4 (mol&eacute;cula estimuladora de c&eacute;lulas Th2)&#93;, Col&aacute;geno   tipo XII (COLI2A1 y SLC40A1), reguladores de apoptosis, genes involucrados en   la formaci&oacute;n y mantenimiento de uniones apretadas requeridas para el contacto   c&eacute;lula-c&eacute;lula24 afectan v&iacute;as de se&ntilde;alizaci&oacute;n de la respuesta inmune innata para   tales como: Interacci&oacute;n citoquina-receptor, receptores TLRs, v&iacute;as de se&ntilde;alizaci&oacute;n   JAK-STAT como mecanismo de evasi&oacute;n de la respuesta inmune y una mejor   capacidad del virus para causar lesiones, las l&iacute;neas de aves con mayor susceptibilidad   al VEM son las l&iacute;neas de aves provenientes directamente de los cruces   realizados con la estirpe Leghonr 28. </p>     <p>La mayor asociaci&oacute;n entre la resistencia gen&eacute;tica a la enfermedad est&aacute; dada por la expresi&oacute;n del complejo mayor de histocompatibilidad (CMH); donde las gallinas con los haplotipos B1, B4, B5, B12, B13, B15 y B19 del CMH son altamente susceptibles a los tumores 52 gallinas con haplotipos B6 y B14 tienen moderada resistencia a VEM y las aves con haplotipos B2, BQ y B21 del CMH son muy resistentes 26, 50, 58.&nbsp;</p>     <p><strong>Conclusi&oacute;n</strong> </p>     <p>El VEM tiene gran importancia en la industria av&iacute;cola debido a que no solamente presenta enfermedad cl&iacute;nica en las aves, si no que repercute en la susceptibilidad de las aves a la presentaci&oacute;n de enfermedad por otros agentes infecciosos debido a la inmunodepresi&oacute;n inducida por el virus; la infecci&oacute;n del virus a las c&eacute;lulas del sistema inmune afecta tanto su n&uacute;mero como su capacidad de responder a los ant&iacute;genos circundantes. Adicional a su condici&oacute;n de latencia en el hu&eacute;sped, el mecanismo de la modificaci&oacute;n/mutaci&oacute;n del genoma del VEM resalta su patog&eacute;nesis, garantiz&aacute;ndole su replicaci&oacute;n, excreci&oacute;n y diseminaci&oacute;n entre los lotes de aves.</p>     <p>En la replicaci&oacute;n del virus intervienen componentes celulares que hacen que el virus   cambie sus caracter&iacute;sticas de patogenicidad y adquiera mecanismos que garantizan   su supervivencia por mucho tiempo en el hospedero, es el caso de la latencia   para poder reactivarse en virus necesita en momentos de cambios intracelulares y   causar enfermedad cl&iacute;nica, mecanismo que hace importante a este agente, debido   a que no se ha controlado esta capacidad del virus para permanecer en la c&eacute;lula y   causar da&ntilde;os  </p>     <p>El VEM ha llevado a que se estudie ampliamente durante el desarrollo de las diferentes   l&iacute;neas gen&eacute;ticas, ya que estas tienen caracter&iacute;sticas que las pueden hacer   susceptibles o resistentes al agente y no pueden desarrollar una respuesta productiva   para evitar los signos cl&iacute;nicos y las p&eacute;rdidas econ&oacute;micas que genera la enfermedad   en el mundo, por esto se han creado muchos grupos en el mundo dedicados   a investigar sobre las diversas caracter&iacute;sticas gen&oacute;micas del virus y como las aves   pueden responder de manera m&aacute;s eficaz y entender mejor la respuesta adaptativa   del sistema inmune frente al agente.</p> <hr>     ]]></body>
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