{"id":343791,"date":"2026-07-24T02:27:38","date_gmt":"2026-07-24T02:27:38","guid":{"rendered":"http:\/\/6a627243455df89e5b7d61a5"},"modified":"2026-07-24T02:27:38","modified_gmt":"2026-07-24T02:27:38","slug":"descubren-una-forma-contagiosa-de-cancer-de-piel-en-los-peces-de-un-lago-de-norteamerica","status":"publish","type":"post","link":"https:\/\/sarmiento24h.com\/?p=343791","title":{"rendered":"Descubren una forma contagiosa de c\u00e1ncer de piel en los peces de un lago de Norteam\u00e9rica"},"content":{"rendered":"<p>La idea de que el c\u00e1ncer pudiera comportarse como una enfermedad contagiosa puede parecer absurda. En humanos, el c\u00e1ncer no se puede transmitir entre una persona y otra, como el covid o la infecci\u00f3n por VIH. Sin embargo, la naturaleza todav\u00eda est\u00e1 llena de sorpresas. En casos excepcionales, las propias c\u00e9lulas cancerosas pueden pasar de un individuo a otro y continuar multiplic\u00e1ndose en un nuevo hu\u00e9sped. Este extra\u00f1o fen\u00f3meno ha sido detectado en animales como perros, demonios de Tasmania y algunas especies de moluscos, y parece que podemos agregar uno m\u00e1s a ese exclusivo club: el pez gato.<\/p>\n<p>Un equipo internacional de investigadores ha identificado un melanoma transmisible en el pez gato marr\u00f3n (<em>Ameiurus nebulosus<\/em>), el primer caso documentado en peces y tambi\u00e9n el primero registrado en un ecosistema de agua dulce. Sus hallazgos fueron reportados este mes en la revista <a href=\"https:\/\/www.nature.com\/articles\/s41586-026-10828-6\"><em>Nature<\/em><\/a>.<\/p>\n<hr>\n<div class=\"ContentCardEmbedWrapper-hkvhYu kMYDit content-card-embed content-card-embed--stacked\" data-testid=\"ContentCardEmbedWrapper\" readability=\"22.313513513514\">\n<div class=\"ContentCardEmbedImage-bqahne fjmzkP content-card-embed__image\" data-testid=\"ContentCardEmbedImage\"><span class=\"SpanWrapper-kFnjvc eKnjjD responsive-asset\"><picture class=\"ResponsiveImagePicture-jKunQM gjCCFj responsive-image\"><img decoding=\"async\" alt=\"Collage de melanoma \" loading=\"lazy\" class=\"ResponsiveImageContainer-dkeESL cQPiWi responsive-image__image\" srcset=\"https:\/\/media.es.wired.com\/photos\/6a5fc1ab874b87707b9ee983\/master\/w_120,c_limit\/WR-VacunaMelanoma.jpg 120w, https:\/\/media.es.wired.com\/photos\/6a5fc1ab874b87707b9ee983\/master\/w_240,c_limit\/WR-VacunaMelanoma.jpg 240w, https:\/\/media.es.wired.com\/photos\/6a5fc1ab874b87707b9ee983\/master\/w_320,c_limit\/WR-VacunaMelanoma.jpg 320w, https:\/\/media.es.wired.com\/photos\/6a5fc1ab874b87707b9ee983\/master\/w_640,c_limit\/WR-VacunaMelanoma.jpg 640w\" sizes=\"100vw\" src=\"https:\/\/media.es.wired.com\/photos\/6a5fc1ab874b87707b9ee983\/master\/w_775%2Cc_limit\/WR-VacunaMelanoma.jpg\"><\/picture><\/span><\/div>\n<div class=\"ContentCardEmbedInfo-buyHWH gWLOee\" readability=\"23.708108108108\">\n<div class=\"BaseText-fEwdHD ContentCardEmbedHed-kDKGDs iUENtL dlHXUJ content-card-embed__hed\" data-testid=\"ContentCardEmbedHed\"><a class=\"BaseLink-haTOKm ContentCardEmbedHedLink-iBZsco ILkR hhUFQU content-card-embed__hed-link link\" href=\"https:\/\/es.wired.com\/articulos\/una-vacuna-contra-el-cancer-de-piel-podria-estar-cerca\" data-testid=\"ContentCardEmbedHedLink\">Una vacuna contra el c\u00e1ncer de piel podr\u00eda estar cerca<\/a><\/div>\n<p>La vacuna personalizada de ARNm podr\u00eda ayudar a prevenir la recurrencia del melanoma, el tipo m\u00e1s peligroso de c\u00e1ncer de piel.<\/p>\n<\/div>\n<\/div>\n<hr>\n<h2>Ni virus ni bacterias, sino un c\u00e1ncer contagioso<\/h2>\n<p>La historia comenz\u00f3 en 2012, cuando pescadores y bi\u00f3logos detectaron un n\u00famero inusualmente alto de bagres con lesiones negras en el lago Memphremagog, un cuerpo de agua compartido por Vermont (Estados Unidos) y Quebec (Canad\u00e1). Estudios previos revelaron que aquellas manchas eran <a href=\"https:\/\/es.wired.com\/articulos\/la-nueva-batalla-contra-el-melanoma-comienza-antes-del-diagnostico\">melanomas malignos<\/a>, y que entre el 23 y el 37% de los ejemplares examinados presentaban estos tumores, una incidencia inusualmente elevada para esta especie.<\/p>\n<p>\u201cAquello fue sorprendente\u201d, dijo Julie Dragon, investigadora de la Universidad de Vermont y coautora principal del estudio. \u201cQuer\u00edamos saber c\u00f3mo es que un pez que vive en el fondo del lago estaba contrayendo un c\u00e1ncer que asociamos con la exposici\u00f3n excesiva al sol\u201d.<\/p>\n<p>En un principio se pens\u00f3 que la causa podr\u00eda ser alguna sustancia t\u00f3xica o un pat\u00f3geno vinculado a la contaminaci\u00f3n. Una sospecha era que las inundaciones provocadas por la tormenta tropical Irene en 2011 hubieran deteriorado la calidad del agua con el arrastre de contaminantes ambientales. Tambi\u00e9n preocupaba la salud del lago porque abastece de agua potable a m\u00e1s de 175,000 personas. Sin embargo, los primeros an\u00e1lisis gen\u00e9ticos comenzaron a apuntar en un direcci\u00f3n ins\u00f3lita.<\/p>\n<p>Fue entonces que los investigadores se preguntaron si los tumores descend\u00edan de un \u00fanico c\u00e1ncer original que hab\u00eda aprendido a transmitirse entre individuos, en lugar de aparecer de manera independiente en cada pez.<\/p>\n<p>Para poner a prueba esta peculiar idea, el equipo secuenci\u00f3 los genomas completos de tumores y tejidos sanos de peces afectados, adem\u00e1s de comparar esos datos con ejemplares sanos procedentes de distintas poblaciones.<\/p>\n<p>Los resultados indicaron que las c\u00e9lulas tumorales de distintos peces estaban mucho m\u00e1s emparentadas entre s\u00ed que con los animales en los que se desarrollaban. En otras palabras, los tumores compart\u00edan una identidad gen\u00e9tica propia, distinta de la de sus hu\u00e9spedes. Adem\u00e1s, cientos de miles de variantes gen\u00e9ticas aparec\u00edan repetidamente en los tumores, pero estaban ausentes en los tejidos sanos de los mismos peces.<\/p>\n<p>Ese patr\u00f3n ser\u00eda pr\u00e1cticamente imposible si cada melanoma hubiera surgido de manera independiente. A modo de comparaci\u00f3n, los investigadores analizaron cientos de melanomas humanos y comprobaron que casi todas sus mutaciones son exclusivas de cada paciente. En contraste, la mayor\u00eda de las mutaciones presentes en los tumores de estos peces aparec\u00eda compartida por numerosos individuos, una se\u00f1al caracter\u00edstica de un c\u00e1ncer clonal transmisible.<\/p>\n<figure data-testid=\"IframeEmbed\" class=\"IframeEmbedWrapper-sc-fixZhC fJBrNq iframe-embed\"><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>La idea de que el c\u00e1ncer pudiera&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":343792,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[46],"tags":[],"class_list":["post-343791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tecnologia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - 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