{"id":1822,"date":"2022-08-14T08:46:19","date_gmt":"2022-08-14T08:46:19","guid":{"rendered":"https:\/\/neuropediatoolbox.org\/?p=1822"},"modified":"2023-12-29T18:36:12","modified_gmt":"2023-12-29T18:36:12","slug":"evaluacion-de-las-variantes-de-significado-incierto-vsi","status":"publish","type":"post","link":"https:\/\/neuropediatoolkit.org\/en\/evaluacion-de-las-variantes-de-significado-incierto-vsi\/","title":{"rendered":"Protocolo de reevaluaci\u00f3n y reclasificaci\u00f3n de las variantes de significado incierto (VSI)."},"content":{"rendered":"\n<p>Los resultados de un estudio gen\u00e9tico no son definitivos, y en el caso de las variantes de significado incierto, es necesario proseguir las investigaciones para esclarecer su significado. <\/p>\n\n\n\n<div id=\"wp-block-themeisle-blocks-accordion-84d52a0a\" class=\"wp-block-themeisle-blocks-accordion exclusive\">\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>Revisa en profundidad el fenotipo de tu paciente (deep phenotyping). <\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<ul class=\"wp-block-list\">\n<li>Los fenotipos de las enfermedades gen\u00e9ticas en la edad pedi\u00e1trica, pueden cambiar con el tiempo, por lo que el seguimiento cl\u00ednico puede aportar informaci\u00f3n relevante en el futuro que permita reclasificar la variante. <\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dado que las interpretaciones de patogenicidad de los laboratorios de gen\u00e9tica utilizan sistemas de codificaci\u00f3n estandarizada del fenotipo, puede ser de utilidad utilizar los<a href=\"http:\/\/neuropediatoolkit.org\/human-phenotype-ontology\/\"> t\u00e9rminos HPO<\/a> para su descripci\u00f3n, y as\u00ed proporcionar m\u00e1s informaci\u00f3n al genetista para su an\u00e1lisis. <\/li>\n<\/ul>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>Realiza un estudio de segregaci\u00f3n familiar.<\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<p>El estudio de segregaci\u00f3n familiar puede dar lugar a varios resultados posibles: <\/p>\n\n\n\n<div id=\"wp-block-themeisle-blocks-accordion-d6cbc4d7\" class=\"wp-block-themeisle-blocks-accordion exclusive\">\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>El estudio parental confirma que la variante es de novo.<\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<p>En el caso de que los familiares sean asintom\u00e1ticos, la detecci\u00f3n de una variante de novo (con confirmaci\u00f3n bioqu\u00edmica de la parentalidad que permita excluir la posibilidad de una paternidad falsamente atribuida) en un gen de herencia autos\u00f3mico dominante o ligada al X, que haya sido previamente involucrado en un fenotipo similar, refuerza su patogenicidad. No obstante, es necesario recordar que todas las personas son portadoras de alrededor de 80-100 mutaciones de novo en su genoma, de las cuales 1-2 pueden encontrarse potencialmente en el exoma. <\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>El estudio parental confirma que la variante es heredada de un progenitor asintom\u00e1tico.<\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<p>En algunas circustancias, demostrar que la variante ha sido heredada de un progenitor asintom\u00e1tico puede reforzar su benignidad. No obstante, hay que interpretar con cautela esta informaci\u00f3n, especialmente en genes de herencia autos\u00f3mico dominante que presenten penetrancia variable, en cuyo caso, esta informaci\u00f3n no modificar\u00eda la clasificaci\u00f3n de patogenicidad. <\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>El estudio parental confirma que la variante segrega con el fenotipo en la familia. <\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<p>En la pr\u00e1ctica resulta dif\u00edcil demostrar que el hallazgo no se ha producido por casualidad si s\u00f3lo disponemos del estudio de los padres, a no ser que dispongamos de un pedigree de gran tama\u00f1o y hayamos podido estudiar a m\u00faltiples miembros de la familia en varias generaciones, tanto afectados como no afectados. <\/p>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>El estudio parental confirma que la variante se encuentra en trans de una variante patog\u00e9nica previamente identificada.<\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<p>En el caso de que el gen involucrado sea de herencia autos\u00f3mico recesiva, y hayamos encontrado dos variantes gen\u00e9ticas, pero s\u00f3lo una de ellas pueda clasificarse como patog\u00e9nica o probablemente patog\u00e9nica, puede ser de utilidad realizar un estudio familiar, dando 2 resultados posibles: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cada variante ha sido heredada de un progenitor (y por lo tanto, se encuentran en trans en el caso \u00edndice), siendo compatibles con una herencia autos\u00f3mico recesiva. <\/li>\n\n\n\n<li>Ambas variantes han sido heredadas del mismo progenitor (y se encuentren en cis, es decir, en el mismo alelo, en el caso \u00edndice), en cuyo caso las variantes encontradas no ser\u00edan responsables de un patr\u00f3n de herencia autos\u00f3mico recesivo.  <\/li>\n<\/ul>\n<\/div><\/details>\n<\/div>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>Estudios bioqu\u00edmicos, estudios funcionales y estudios de <a href=\"http:\/\/neuropediatoolkit.org\/episign\/\">expresi\u00f3n de RNA<\/a>. <\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<ul class=\"wp-block-list\">\n<li>En caso de que el gen identificado disponga de un biomarcador, como en el caso de los errores cong\u00e9nitos del metabolismo, pueden realizarse <a href=\"http:\/\/neuropediatoolkit.org\/vademecum-metabolicum\/\">investigaciones bioqu\u00edmicas dirigidas<\/a>, como un estudio enzim\u00e1tico, para demostrar que la variante identificada produce repercusi\u00f3n in vivo.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>En caso de que esto no sea posible, y se sospeche que la localizaci\u00f3n de la variante puede condicionar consecuencias sobre el splicing o la <a href=\"http:\/\/neuropediatoolkit.org\/episign\/\">expresi\u00f3n del RNA<\/a>, pueden realizarse estudios de secuenciaci\u00f3n del RNA para confirmarlo. <\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>En los centros que dispongan de grupos de investigaci\u00f3n b\u00e1sicos o est\u00e9n en contacto con estos, pueden realizarse estudios funcionales sobre organismos biosimilares, knock-outs o otras t\u00e9cnicas experimentales.  <\/li>\n<\/ul>\n<\/div><\/details>\n\n\n\n<details class=\"wp-block-themeisle-blocks-accordion-item\"><summary class=\"wp-block-themeisle-blocks-accordion-item__title\"><div>Reanaliza las bases de datos peri\u00f3dicamente. <\/div><\/summary><div class=\"wp-block-themeisle-blocks-accordion-item__content\">\n<p>El proceso de clasificaci\u00f3n de las variantes gen\u00e9ticas es din\u00e1mico, y depende de la informaci\u00f3n disponible en el momento del an\u00e1lisis, pero se est\u00e1 produciendo una acumulaci\u00f3n vertiginosa de informaci\u00f3n que puede condicionar un cambio de interpretaci\u00f3n si se realiza un rean\u00e1lisis tras un per\u00edodo de tiempo. Se estima que un 10% de las variantes de significado incierto pueden ser reclasificadas en el rean\u00e1lisis tras 2 a\u00f1os y pasar a ser patog\u00e9nicas o probablemente patog\u00e9nicas. <\/p>\n\n\n\n<p>Existen varias <a href=\"http:\/\/neuropediatoolkit.org\/clingen\/\">herramientas para revisar la actual clasificaci\u00f3n<\/a> de una VSI en funci\u00f3n de los datos actualizados. <\/p>\n\n\n\n<p>La probabilidad tampoco es igual en funci\u00f3n de la clasificaci\u00f3n previa de patogenicidad: <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" src=\"http:\/\/neuropediaclinic.com\/wp-content\/uploads\/2022\/09\/image-25.png\" alt=\"\" class=\"wp-image-2200\" width=\"536\" height=\"366\" srcset=\"https:\/\/neuropediatoolkit.org\/wp-content\/uploads\/2022\/09\/image-25.png 850w, https:\/\/neuropediatoolkit.org\/wp-content\/uploads\/2022\/09\/image-25-300x205.png 300w, 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A Standardized DNA Variant Scoring System for Pathogenicity Assessments in Mendelian Disorders. Human Mutation [Internet]. 2016 [cited 2022 Sept 22];37(1):127\u201334. 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[cited 2022 Sept 22]. 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