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El genoma del lagarto anole verde y un análisis comparativo con aves y mamíferos
Jessica Alföldi1, Federica Di Palma, Manfred Grabherr
1Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA. jalfoldi@broadinstitute.org
Nature
|September 2, 2011
Resumen
La primera secuencia del genoma de un reptil no aviar, el lagarto anole verde (Anolis carolinensis), revela características genómicas únicas y la rápida evolución de las proteínas del huevo amniótico. Esto proporciona información sobre la adaptación terrestre de los vertebrados.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- La genómica es la genómica.
- La genómica comparada es una genómica comparada.
Sus antecedentes:
- El huevo amniótico permitió la colonización de vertebrados terrestres, una innovación evolutiva clave.
- Las secuencias del genoma existen para los mamíferos y las aves, pero no para los reptiles no aviares, lo que limita los estudios genómicos comparativos.
Objetivo del estudio:
- Para secuenciar el genoma del lagarto anole verde norteamericano (Anolis carolinensis).
- Proporcionar un recurso genómico para los reptiles no aviares.
- Investigar la historia evolutiva y las características genómicas de los reptiles.
Principales métodos:
- Secuenciación del genoma completo de Anolis carolinensis.
- Análisis genómico comparativo con otros amniotas (mamíferos, aves).
- Análisis filogenético de lagartos anole.
Principales resultados:
- Los microcromosomas de Anolis carolinensis muestran sintenia con el pollo, pero difieren en GC y contenido de repetición.
- El genoma de la lagartija contiene elementos móviles jóvenes y diversos, superando a otros amniotas.
- El cromosoma X de Anolis carolinensis fue identificado y secuenciado.
- Las proteínas del huevo amniótico exhiben una evolución significativamente más rápida que otras proteínas.
Conclusiones:
- El genoma de Anolis carolinensis presenta características únicas, incluyendo un contenido homogéneo de GC y elementos móviles altamente activos.
- El análisis comparativo pone de relieve distintas trayectorias evolutivas entre los amniotas.
- El estudio ilumina los fundamentos genómicos de la adaptación de los vertebrados a la tierra y la evolución de las estrategias reproductivas.
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