{"id":7125,"date":"2026-11-06T04:47:19","date_gmt":"2026-11-06T09:47:19","guid":{"rendered":"https:\/\/canasanta.ca\/?p=7125"},"modified":"2026-11-06T04:47:19","modified_gmt":"2026-11-06T09:47:19","slug":"hibrido-cabra-ibice-genetica-evolucion","status":"publish","type":"post","link":"https:\/\/canasanta.ca\/en\/ciencia\/hibrido-cabra-ibice-genetica-evolucion\/","title":{"rendered":"UN CRUCE IMPOSIBLE REESCRIBE LA HISTORIA DE LAS CABRAS"},"content":{"rendered":"

Una investigaci\u00f3n gen\u00e9tica publicada el 4 de noviembre de 2026 en Communications Biology<\/em> demuestra que la frontera reproductiva entre las cabras dom\u00e9sticas y ciertos \u00edbices salvajes no es tan r\u00edgida como se pensaba. El trabajo identifica un h\u00edbrido y descendientes de un cruce posterior, adem\u00e1s de se\u00f1ales gen\u00f3micas que obligan a revisar c\u00f3mo se interpreta el parentesco entre especies.<\/p>\n

EL H\u00cdBRIDO QUE CAMBIA LA PREGUNTA<\/h2>\n

The team led by Ne\u017ea Pogorevc<\/strong>, junto con Maulik Upadhyay<\/strong> y Ivica Medugorac<\/strong>, examin\u00f3 secuencias gen\u00f3micas completas de 164 animales del g\u00e9nero Capra<\/em><\/strong>, entre ellos 36 cuyos genomas fueron generados para este trabajo. La muestra permiti\u00f3 comparar cabras dom\u00e9sticas con parientes silvestres y buscar rastros de cruces entre linajes.<\/p>\n

Los cient\u00edficos confirmaron gen\u00e9ticamente la existencia de un h\u00edbrido entre cabra e \u00edbice y detectaron dos descendientes de retrocruzamiento<\/strong>. Este \u00faltimo t\u00e9rmino designa el apareamiento de un h\u00edbrido con uno de los linajes parentales. El resultado proporciona evidencia de que al menos un macho h\u00edbrido de primera generaci\u00f3n fue f\u00e9rtil. No significa que todos los cruces posibles entre esas especies produzcan descendencia viable.<\/p>\n

HUELLAS ANTERIORES A LA DOMESTICACI\u00d3N<\/h2>\n

La investigaci\u00f3n tambi\u00e9n compar\u00f3 la cabra dom\u00e9stica (Capra hircus<\/em>), su antepasado silvestre, el bezoar (Capra aegagrus<\/em>), y tres especies de \u00edbice: Capra ibex<\/em>, Capra pyrenaica<\/em> y Capra sibirica<\/em>. El objetivo era distinguir qu\u00e9 fragmentos de ADN compartido pod\u00edan proceder de cruces antiguos y cu\u00e1les ten\u00edan explicaciones evolutivas diferentes.<\/p>\n

Los autores identificaron ocho regiones candidatas<\/strong> con variantes gen\u00e9ticas compartidas compatibles con una transferencia antigua de material hereditario, anterior a la domesticaci\u00f3n. Entre los genes de esas regiones aparecen funciones relacionadas con el olfato y la inmunidad. Sin embargo, la presencia de genes con esas funciones no demuestra por s\u00ed sola que los cruces hayan mejorado el olfato o las defensas de los animales.<\/p>\n

Una parte importante del hallazgo es precisamente la cautela: los an\u00e1lisis sugieren que muchas variantes compartidas son m\u00e1s antiguas que la domesticaci\u00f3n, pero no permiten atribuir autom\u00e1ticamente cada coincidencia gen\u00e9tica a un episodio de hibridaci\u00f3n.<\/p>\n

\"\u00cdbice
\u00cdbice alpino. Fotograf\u00eda de contexto: Rafael Peier \/ Unsplash.<\/figcaption><\/figure>\n

UNA TRAMPA EN LA LECTURA DEL ADN<\/h2>\n

Cuando dos especies conservan secuencias semejantes, la explicaci\u00f3n intuitiva puede ser que se cruzaron y mezclaron sus genes. Los bi\u00f3logos llaman introgresi\u00f3n<\/em> a la incorporaci\u00f3n de material gen\u00e9tico de una poblaci\u00f3n o especie en otra mediante hibridaci\u00f3n y cruces posteriores. Pero existe otro mecanismo que puede producir patrones parecidos: la selecci\u00f3n equilibradora<\/strong>.<\/p>\n

Este tipo de selecci\u00f3n natural puede mantener distintas variantes gen\u00e9ticas durante periodos prolongados, incluso a trav\u00e9s de la separaci\u00f3n de linajes. As\u00ed, una coincidencia entre cabras e \u00edbices puede reflejar una herencia ancestral conservada, no necesariamente un intercambio reciente de genes. Los autores encontraron se\u00f1ales compatibles con esa explicaci\u00f3n alternativa en algunas regiones.<\/p>\n

La distinci\u00f3n importa mucho m\u00e1s all\u00e1 de las cabras. Los estudios gen\u00f3micos de animales salvajes, especies dom\u00e9sticas y poblaciones humanas suelen reconstruir migraciones, mezclas y adaptaciones a partir de fragmentos compartidos de ADN. Confundir una variante ancestral persistente con una transferencia gen\u00e9tica posterior puede alterar la historia evolutiva que se intenta reconstruir.<\/p>\n

LO QUE REVELA Y LO QUE TODAV\u00cdA NO<\/h2>\n

El estudio ofrece una prueba concreta de que la reproducci\u00f3n entre cabras e \u00edbices puede producir descendencia f\u00e9rtil en determinadas circunstancias<\/strong>. Tambi\u00e9n muestra que el pasado gen\u00e9tico del g\u00e9nero Capra<\/em> es m\u00e1s complejo que una separaci\u00f3n limpia entre animales domesticados y sus parientes de monta\u00f1a.<\/p>\n

No demuestra, en cambio, que la hibridaci\u00f3n sea habitual en todas las poblaciones actuales ni que cada regi\u00f3n gen\u00e9tica compartida haya pasado de una especie a otra por cruzamiento. Las ocho regiones identificadas son candidatas sujetas a interpretaci\u00f3n, y el propio trabajo destaca la necesidad de separar la introgresi\u00f3n de otros procesos evolutivos.<\/p>\n

El resultado ampl\u00eda la comprensi\u00f3n de c\u00f3mo surgen y se mantienen las diferencias entre especies. La evoluci\u00f3n no siempre avanza como un \u00e1rbol de ramas aisladas: a veces conserva rasgos muy antiguos y, en ocasiones, permite que esas ramas vuelvan a encontrarse.<\/p>","protected":false},"excerpt":{"rendered":"

Un estudio de 164 genomas confirma un h\u00edbrido f\u00e9rtil entre cabras e \u00edbices y revela por qu\u00e9 el ADN compartido no siempre demuestra cruces antiguos.<\/p>","protected":false},"author":284226809,"featured_media":7123,"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":[33208655,33208656,33208654],"class_list":["post-7125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-al-dia","category-ciencia","tag-ibice","tag-genetica-evolutiva","tag-hibridacion"],"acf":[],"yoast_head":"\nUN 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