{"id":7250,"date":"2026-11-07T02:34:27","date_gmt":"2026-11-07T07:34:27","guid":{"rendered":"https:\/\/canasanta.ca\/?p=7250"},"modified":"2026-11-07T02:34:27","modified_gmt":"2026-11-07T07:34:27","slug":"debilidad-genetica-tankirasa-tnks2-cancer","status":"publish","type":"post","link":"https:\/\/canasanta.ca\/en\/ciencia\/debilidad-genetica-tankirasa-tnks2-cancer\/","title":{"rendered":"ENCUENTRAN UNA DEBILIDAD OCULTA EN CIERTOS C\u00c1NCERES"},"content":{"rendered":"

Una debilidad gen\u00e9tica que aparece durante la evoluci\u00f3n de algunos tumores podr\u00eda convertirse en una v\u00eda para atacarlos sin perjudicar de la misma manera a las c\u00e9lulas sanas. Investigadores de Weill Cornell Medicine<\/strong>, en Estados Unidos, han identificado una dependencia molecular que permite ensayar una estrategia m\u00e1s selectiva contra ciertos c\u00e1nceres. Los resultados fueron publicados el 2 de noviembre de 2026<\/strong> en la revista Nature Chemical Biology<\/em>.<\/p>\n

El trabajo no anuncia una cura ni un medicamento disponible para pacientes. Se trata de una investigaci\u00f3n precl\u00ednica que combina gen\u00e9tica tumoral y qu\u00edmica medicinal. Su inter\u00e9s reside en un problema que durante d\u00e9cadas ha frustrado a los especialistas: c\u00f3mo bloquear se\u00f1ales que alimentan el c\u00e1ncer cuando esas mismas se\u00f1ales tambi\u00e9n son necesarias para el funcionamiento normal del organismo.<\/p>\n

Una de esas se\u00f1ales pertenece a la v\u00eda WNT<\/strong>, una red de comunicaci\u00f3n celular fundamental para el desarrollo y la renovaci\u00f3n de tejidos. Su actividad descontrolada favorece el crecimiento de numerosos tumores, especialmente los colorrectales. Sin embargo, interrumpirla indiscriminadamente puede causar efectos indeseados porque las c\u00e9lulas saludables tambi\u00e9n dependen de ella.<\/p>\n

UNA V\u00cdA QUE TAMBI\u00c9N NECESITAN LAS C\u00c9LULAS SANAS<\/h2>\n

El equipo dirigido por Lukas Dow<\/strong> examin\u00f3 dos enzimas emparentadas, TNKS1<\/strong> y TNKS2<\/strong>, conocidas como tankirasas. Ambas ayudan a sostener la se\u00f1alizaci\u00f3n WNT y, en muchas circunstancias, pueden compensarse mutuamente. Esa redundancia resulta decisiva para entender la oportunidad terap\u00e9utica.<\/p>\n

Al estudiar c\u00e9lulas cancerosas, los cient\u00edficos observaron que algunas hab\u00edan perdido el gen de TNKS1 como consecuencia de grandes deleciones de ADN. La p\u00e9rdida no las eliminaba, porque TNKS2 continuaba realizando funciones similares. Pero las dejaba dependiendo de la segunda enzima de una forma que no necesariamente comparten las c\u00e9lulas normales.<\/p>\n

Esta situaci\u00f3n constituye una vulnerabilidad selectiva: si se bloquea TNKS2 en un tumor que ya carece de TNKS1, la se\u00f1alizaci\u00f3n de crecimiento puede debilitarse. Una c\u00e9lula sana que conserva ambas enzimas dispone, en cambio, de una alternativa funcional. La hip\u00f3tesis es atractiva porque aprovecha una diferencia gen\u00e9tica del c\u00e1ncer en lugar de atacar indiscriminadamente un proceso biol\u00f3gico.<\/p>\n

\"Cient\u00edfica
An\u00e1lisis molecular en un laboratorio. Fotograf\u00eda de contexto: CDC\/Unsplash; no corresponde al experimento descrito.<\/figcaption><\/figure>\n

UNA MOL\u00c9CULA QUE DISTINGUE DOS ENZIMAS<\/h2>\n

Para probarla, los investigadores utilizaron primero herramientas gen\u00e9ticas capaces de reducir espec\u00edficamente la actividad de TNKS2. Despu\u00e9s emprendieron una tarea qu\u00edmica mucho m\u00e1s dif\u00edcil: desarrollar una mol\u00e9cula que distinguiera entre dos prote\u00ednas cuyos centros activos son extraordinariamente parecidos.<\/p>\n

Con ayuda de especialistas en modelizaci\u00f3n y dise\u00f1o de compuestos, obtuvieron un inhibidor experimental que mostr\u00f3 una preferencia aproximada de 30 veces por TNKS2<\/strong> frente a TNKS1. En cultivos celulares, el compuesto fren\u00f3 el crecimiento de c\u00e9lulas tumorales con p\u00e9rdida parcial o completa de TNKS1, mientras que las c\u00e9lulas que conservaban niveles normales de esa enzima no mostraron el mismo efecto.<\/p>\n

El resultado aporta una demostraci\u00f3n inicial del mecanismo, pero no establece todav\u00eda su eficacia ni su seguridad en seres humanos. Los experimentos descritos corresponden a una etapa temprana del desarrollo farmacol\u00f3gico, y un compuesto prometedor en laboratorio puede fracasar posteriormente por problemas de distribuci\u00f3n, toxicidad o falta de actividad en organismos completos.<\/p>\n

Los autores buscan ahora mol\u00e9culas de nueva generaci\u00f3n con mejores propiedades farmacol\u00f3gicas. Los modelos estructurales detallados de ambas enzimas podr\u00edan facilitar esa optimizaci\u00f3n y ayudar a confirmar que la selectividad se mantiene en condiciones biol\u00f3gicas m\u00e1s complejas.<\/p>\n

<\/div>\n

DEL LABORATORIO A LOS PACIENTES<\/h2>\n

La investigaci\u00f3n tambi\u00e9n invita a mirar las p\u00e9rdidas de material gen\u00e9tico de los tumores de otra manera. Habitualmente se estudian las mutaciones que activan genes promotores del c\u00e1ncer; aqu\u00ed, en cambio, la ausencia de un gen puede revelar una dependencia inesperada y, con ella, un posible punto d\u00e9bil.<\/p>\n

Queda por determinar qu\u00e9 pacientes presentar\u00edan esa combinaci\u00f3n molecular, c\u00f3mo identificarla mediante pruebas tumorales y si el bloqueo de TNKS2 ser\u00eda tolerable a largo plazo. Solo despu\u00e9s de estudios precl\u00ednicos completos y ensayos cl\u00ednicos podr\u00eda hablarse de una opci\u00f3n terap\u00e9utica real.<\/p>\n

Por ahora, la aportaci\u00f3n m\u00e1s s\u00f3lida es conceptual y experimental: una alteraci\u00f3n gen\u00e9tica que ayuda al tumor a sobrevivir puede hacerlo, al mismo tiempo, m\u00e1s vulnerable a una intervenci\u00f3n dise\u00f1ada con precisi\u00f3n<\/strong>. La medicina oncol\u00f3gica busca justamente ese equilibrio entre atacar el c\u00e1ncer y preservar los tejidos que lo rodean.<\/p>","protected":false},"excerpt":{"rendered":"

Investigadores identifican una vulnerabilidad gen\u00e9tica que permitir\u00eda atacar ciertos tumores con mayor precisi\u00f3n. Estudio precl\u00ednico publicado el 2 de noviembre.<\/p>","protected":false},"author":284226809,"featured_media":7248,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_wpcom_ai_launchpad_first_post":false,"_jetpack_hide_featured_image":false,"_jetpack_featured_image_duplicate_dismissed":0,"_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":[33205457,3213],"tags":[33206011,33205939,33207182],"class_list":["post-7250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-al-dia","category-ciencia","tag-cancer","tag-investigacion-medica","tag-oncologia-de-precision"],"acf":[],"yoast_head":"\nENCUENTRAN UNA DEBILIDAD OCULTA EN CIERTOS C\u00c1NCERES - Ca\u00f1asanta<\/title>\n<meta name=\"description\" content=\"Un estudio de Weill Cornell identifica una debilidad gen\u00e9tica de ciertos tumores y ensaya un inhibidor selectivo de TNKS2. 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