{"id":707,"date":"2026-07-09T18:06:31","date_gmt":"2026-07-09T16:06:31","guid":{"rendered":"https:\/\/kleefstrasyndrome.com\/?p=707"},"modified":"2026-08-21T06:15:03","modified_gmt":"2026-08-21T04:15:03","slug":"estudio-vincula-ehmt2-a-un-nuevo-trastorno-similar-a-kleefstra","status":"publish","type":"post","link":"https:\/\/kleefstrasyndrome.com\/es\/study-links-ehmt2-new-kleefstra-like-disorder\/","title":{"rendered":"Nueva estudio vincula el gen EHMT2 con el trastorno de tipo Kleefstra"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Un equipo internacional de investigaci\u00f3n relacion\u00f3 variantes del gen <em>EHMT2<\/em> con un raro trastorno del neurodesarrollo que presenta importantes similitudes con el s\u00edndrome de Kleefstra. El trabajo, que fue publicado en el <em>Nature Communications<\/em> el 1 de julio de 2026, describe siete nuevas variantes gen\u00e9ticas (de novo), es decir, cambios que no se detectaron en los padres, en personas con hallazgos cl\u00ednicos y moleculares similares.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Los autores sugieren la denominaci\u00f3n \u00abs\u00edndrome de Kleefstra autos\u00f3mico dominante relacionado con EHMT2\u00bb. Para evitar confusiones, es m\u00e1s preciso hablar de <strong>s\u00edndrome de tipo Kleefstra relacionado con el gen EHMT2<\/strong>. Se trata de un trastorno cong\u00e9nito reci\u00e9n descrito y no de una sustituci\u00f3n o revisi\u00f3n del diagn\u00f3stico establecido del s\u00edndrome de Kleefstra tipo 1, el cual est\u00e1 relacionado con <em>EHMT1<\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El hallazgo puede tener importancia diagn\u00f3stica para algunas personas que presentan un cuadro similar al de Kleefstra, pero no se ha encontrado una explicaci\u00f3n en el <em>EHMT1<\/em>. Sin embargo, no constituye un estudio terap\u00e9utico. No se prob\u00f3 ning\u00fan f\u00e1rmaco, terapia g\u00e9nica o de ARN en humanos, no se realiz\u00f3 ning\u00fan ensayo cl\u00ednico aleatorizado y no surgi\u00f3 ninguna intervenci\u00f3n disponible para las familias.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfPor qu\u00e9 el EHMT2 se relaciona biol\u00f3gicamente con el EHMT1?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La relaci\u00f3n entre los dos genes no es sintom\u00e1tica. El <em>EHMT1<\/em> da las instrucciones para la producci\u00f3n de la prote\u00edna GLP, mientras que el <em>EHMT2<\/em> codifica la prote\u00edna G9a. Las dos prote\u00ednas trabajan juntas en un complejo que participa en la regulaci\u00f3n epigen\u00e9tica: ayuda a controlar qu\u00e9 genes son m\u00e1s o menos activos, sin cambiar la secuencia de las \u00abletras\u00bb del ADN.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El complejo GLP\/G9a coloca marcas qu\u00edmicas reguladoras en las histonas, las prote\u00ednas alrededor de las cuales se organiza el ADN. De este modo, afecta a la estructura de la cromatina y al acceso a los genes durante el desarrollo. El nuevo estudio sostiene que la alteraci\u00f3n del lado G9a\/EHMT2 de este mecanismo com\u00fan puede dar lugar a un cuadro cl\u00ednico y molecular similar al del trastorno por GLP\/EHMT1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En el s\u00edndrome de Kleefstra tipo 1, el mecanismo fundamental m\u00e1s frecuente es la <strong>deficiencia de una copia funcional de EHMT1<\/strong>de las dos copias del gen, una se ha eliminado o inactivado y la otra no es suficiente para el desarrollo normal. Los investigadores proponen un mecanismo diferente para las variantes espec\u00edficas del <em>EHMT2<\/em>. Las prote\u00ednas G9a modificadas parec\u00edan permanecer estructuralmente estables, pero no pod\u00edan realizar correctamente su actividad de metiltransferasa.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Los resultados de laboratorio sugieren una posible <strong>acci\u00f3n negativa predominante<\/strong>. En pocas palabras, la prote\u00edna modificada puede interferir en la funci\u00f3n del complejo normal, a pesar de que tambi\u00e9n existe una copia no afectada del mismo. <em>EHMT2<\/em>. Esto difiere de la simple producci\u00f3n de una menor cantidad de prote\u00edna y no significa que los dos trastornos gen\u00e9ticos sean id\u00e9nticos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Combinaci\u00f3n de datos gen\u00e9ticos, moleculares y precl\u00ednicos<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La fuerza del trabajo radica en que no se bas\u00f3 \u00fanicamente en la b\u00fasqueda de variantes raras. Los investigadores combinaron la gen\u00e9tica cl\u00ednica con el an\u00e1lisis de patrones caracter\u00edsticos de metilaci\u00f3n del ADN, modificaciones de histonas y expresi\u00f3n g\u00e9nica. Se inform\u00f3 que estos patrones moleculares eran similares a los observados en el s\u00edndrome de Kleefstra tipo 1, lo que ofrece niveles de evidencia diferentes pero convergentes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La firma epigen\u00e9tica, es decir, un patr\u00f3n de laboratorio caracter\u00edstico de metilaci\u00f3n del ADN, puede ayudar a evaluar la importancia de una variante gen\u00e9tica. No constituye por s\u00ed sola un s\u00edntoma, pron\u00f3stico o indicaci\u00f3n de respuesta a un tratamiento. Del mismo modo, la similitud en los patrones de expresi\u00f3n g\u00e9nica indica una posible alteraci\u00f3n de v\u00edas biol\u00f3gicas comunes, pero no demuestra que el curso y todas las manifestaciones de ambas condiciones vayan a ser id\u00e9nticos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Los investigadores tambi\u00e9n examinaron en el laboratorio si las prote\u00ednas G9a modificadas conservaban su funci\u00f3n enzim\u00e1tica normal. Concluyeron que eran catal\u00edticamente deficientes, probablemente debido a interacciones alteradas con la histona H3 o con el donante molecular de metilo que utilizan las metiltransferasas. Se trata de un hallazgo bioqu\u00edmico y no de una prueba de metilaci\u00f3n rutinaria ni de un objetivo terap\u00e9utico ya validado en pacientes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un nivel adicional de apoyo provino de ratones que portaban una variante <em>EHMT2<\/em> proveniente de un paciente. Los animales mostraron retraso en el crecimiento, diferencias en el cr\u00e1neo y las caracter\u00edsticas faciales, as\u00ed como comportamiento anormal. El modelo refuerza la estimaci\u00f3n de que la variante puede afectar el desarrollo en un organismo vivo. Sin embargo, un rat\u00f3n no reproduce toda la condici\u00f3n humana y estos hallazgos no predicen si un tratamiento futuro ser\u00eda eficaz o seguro para los humanos.<\/p>\n\n\n\n<div class=\"wp-block-group family-meaning\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">Qu\u00e9 significa para las familias<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Para una persona con una variante pat\u00f3gena confirmada del <em>EHMT1<\/em> o mediante deleci\u00f3n de la regi\u00f3n 9q34.3 que incluye el <em>EHMT1<\/em>, la nueva publicaci\u00f3n no cambia el diagn\u00f3stico del s\u00edndrome de Kleefstra tipo 1. No implica un cambio en los tratamientos, en el seguimiento cl\u00ednico, en los medicamentos, en el programa educativo o en las intervenciones de apoyo. El cuidado sigue necesitando la personalizaci\u00f3n por parte de los equipos m\u00e9dicos tratantes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para familias en las que existe un cuadro de tipo Kleefstra sin hallazgo diagn\u00f3stico en el <em>EHMT1<\/em>, el <em>EHMT2<\/em> constituye ahora un gen que puede ser evaluado por el equipo de gen\u00e9tica cl\u00ednica, especialmente cuando un an\u00e1lisis gen\u00f3mico m\u00e1s amplio ha identificado una variante rara. Un resultado en un informe gen\u00e9tico no es autom\u00e1ticamente pat\u00f3geno. Se requiere la clasificaci\u00f3n por un laboratorio acreditado, la correlaci\u00f3n con el cuadro cl\u00ednico y, cuando est\u00e9 indicado, el an\u00e1lisis de los padres. \u00abAutos\u00f3mico dominante\u00bb no significa aqu\u00ed que un progenitor fuera obligatoriamente portador o tuviera s\u00edntomas, ya que las variantes se informaron como de novo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La contribuci\u00f3n directa m\u00e1s importante del estudio es que ampl\u00eda la comprensi\u00f3n de la red GLP\/G9a y ofrece nuevas herramientas para la investigaci\u00f3n, como firmas moleculares y un modelo animal. Se necesitar\u00e1n futuros grupos de pacientes m\u00e1s grandes para esclarecer el espectro cl\u00ednico completo, la historia natural y las posibles diferencias con el s\u00edndrome de Kleefstra de tipo 1.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La base de datos humana sigue siendo muy peque\u00f1a. La publicaci\u00f3n informa de siete variantes de novo y a\u00fan no permite estimaciones fiables sobre la frecuencia de caracter\u00edsticas individuales o sobre el pron\u00f3stico. Tambi\u00e9n es probable que se hayan identificado principalmente personas que llegaron a centros gen\u00e9ticos y de investigaci\u00f3n especializados, mientras que los casos m\u00e1s leves o at\u00edpicos pueden no haber sido reconocidos. Adem\u00e1s, la versi\u00f3n disponible est\u00e1 caracterizada por el editor como un manuscrito no editado definitivamente, por lo que su redacci\u00f3n y presentaci\u00f3n podr\u00edan actualizarse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En total, el trabajo ofrece un fuerte indicio inicial de que la p\u00e9rdida de la funci\u00f3n normal de G9a a trav\u00e9s de variantes espec\u00edficas del <em>EHMT2<\/em> puede causar un trastorno estrechamente relacionado con el de Kleefstra. Es un avance sustancial para el diagn\u00f3stico y la biolog\u00eda de la enfermedad, pero no una prueba de que intervenir en la metilaci\u00f3n de las histonas vaya a mejorar los s\u00edntomas. <\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-group study-source\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">Fuentes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.nature.com\/articles\/s41467-026-74987-w\" target=\"_blank\" rel=\"noopener noreferrer\">Variantes de *de novo* en EHMT2 causan un s\u00edndrome de Kleefstra autos\u00f3mico dominante relacionado con EHMT2 mediante la p\u00e9rdida de actividad de metiltransferase G9a | Nature Communications<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ncbi.nlm.nih.gov\/books\/NBK47079\/\" target=\"_blank\" rel=\"noopener noreferrer\">S\u00edndrome de Kleefstra \u2013 GeneReviews\u00ae \u2013 NCBI Bookshelf<\/a><\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Los investigadores identificaron siete nuevas variantes de EHMT2 en personas con caracter\u00edsticas cl\u00ednicas y moleculares similares al s\u00edndrome de Kleefstra tipo 1. El descubrimiento puede ayudar a investigar algunos casos inexplicables, pero no cambia el diagn\u00f3stico o la atenci\u00f3n de las personas con un trastorno confirmado de EHMT1.<\/p>","protected":false},"author":1,"featured_media":2466,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[9],"tags":[36,50,52,51,37,53],"class_list":["post-707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research","tag-ehmt1","tag-ehmt2","tag-epigenetics","tag-genetics","tag-kleefstra-syndrome","tag-rare-disease-research"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u039d\u03ad\u03b1 \u03bc\u03b5\u03bb\u03ad\u03c4\u03b7 \u03c3\u03c5\u03bd\u03b4\u03ad\u03b5\u03b9 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content=\"6 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/kleefstrasyndrome.com\\\/study-links-ehmt2-new-kleefstra-like-disorder\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/kleefstrasyndrome.com\\\/study-links-ehmt2-new-kleefstra-like-disorder\\\/\"},\"author\":{\"name\":\"\u039a\u03b1\u03c4\u03b5\u03c1\u03af\u03bd\u03b1 \u03a4\u03b6\u03b7\u03bc\u03bf\u03cd\u03c1\u03c4\u03b1\",\"@id\":\"https:\\\/\\\/kleefstrasyndrome.com\\\/#\\\/schema\\\/person\\\/4724902d3b1788b33671617de24a26b0\"},\"headline\":\"\u039d\u03ad\u03b1 \u03bc\u03b5\u03bb\u03ad\u03c4\u03b7 \u03c3\u03c5\u03bd\u03b4\u03ad\u03b5\u03b9 \u03c4\u03bf \u03b3\u03bf\u03bd\u03af\u03b4\u03b9\u03bf EHMT2 \u03bc\u03b5 \u03b4\u03b9\u03b1\u03c4\u03b1\u03c1\u03b1\u03c7\u03ae \u03c4\u03cd\u03c0\u03bf\u03c5 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