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Transferencia genética horizontal masiva en rotiferos bdelloideos
Eugene A Gladyshev1, Matthew Meselson, Irina R Arkhipova
1Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
Science (New York, N.Y.)
|May 31, 2008
Resumen
Los rotiferos bdelloides exhiben una extensa transferencia horizontal de genes, incorporando genes de bacterias, hongos y plantas. Estos genes extraños, que se encuentran en las regiones teloméricas, son funcionales e integrados en el genoma rotifer, impulsando la innovación evolutiva.
Área de la Ciencia:
- La genómica es la genómica.
- Biología evolutiva Biología evolutiva.
- Zoología Zoología Zoología.
Sus antecedentes:
- La transferencia horizontal de genes (HGT) es rara en los metazoos, por lo general vinculada a la simbiosis o el parasitismo.
- Los rotiferos bdelloides son un grupo único de micro-animales conocidos por su reproducción asexual y resiliencia.
Objetivo del estudio:
- Para investigar la extensión y el origen de los genes extraños en bdelloid rotifers.
- Comprender la integración funcional y las implicaciones evolutivas de HGT en este linaje.
Principales métodos:
- Análisis bioinformático de genomas bdelloides para identificar genes de origen no rotífero.
- Genómica comparativa para determinar la ubicación de los genes e identificar elementos genéticos móviles.
- Análisis de expresión génica y ensayos funcionales para genes extraños seleccionados.
Principales resultados:
- Los rotiferos bdelloides poseen numerosos genes adquiridos de bacterias, hongos y plantas, principalmente ubicados en regiones teloméricas.
- Estos genes extraños a menudo están asociados con elementos genéticos móviles y varían en integridad, con algunos intactos y transcritos.
- Un gen derivado de una bacteria se expresó con éxito en Escherichia coli, produciendo una enzima activa, lo que demuestra una asimilación funcional.
Conclusiones:
- La transferencia horizontal de genes es un factor significativo en la evolución del rotifer bdelloide, contribuyendo con nuevo material genético.
- La integración funcional de los genes exógenos sugiere un mecanismo evolutivo único en los bdelloides.
- Las regiones teloméricas pueden servir como puntos de acceso para la captura de genes y la integración en genomas bdelloides.
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