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A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
Published on: August 11, 2010
La evolución divergente de genes duplicados conduce a incompatibilidades genéticas dentro de A. thaliana
David Bikard1, Dhaval Patel, Claire Le Metté
1Genetics and Plant Breeding, INRA, SGAP UR254, F-78026 Versailles, France.
Science (New York, N.Y.)
|January 31, 2009
Resumen
Las interacciones genéticas en Arabidopsis thaliana causan letalidad embrionaria debido a la evolución divergente en genes duplicados. Esto pone de relieve cómo la duplicación y pérdida de genes pueden impulsar las incompatibilidades genéticas y la especiación entre especies.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- Genética La genética.
- La ciencia de las plantas es la ciencia de las plantas.
Sus antecedentes:
- Las barreras poszigóticas son cruciales para la especiación.
- Las incompatibilidades genéticas pueden surgir de las interacciones del locus.
- Los cruces interespecíficos pueden verse obstaculizados por tales incompatibilidades.
Objetivo del estudio:
- Investigar las interacciones epistáticas que causan la letalidad embrionaria en Arabidopsis thaliana.
- Determinar el papel de la evolución divergente en parálogos de genes duplicados esenciales.
- Comprender la contribución de la duplicación genética y la extinción a las incompatibilidades genéticas.
Principales métodos:
- Experimentos de cruzamiento entre cepas de Arabidopsis thaliana.
- Análisis de las interacciones epistáticas entre localizaciones específicas.
- Examen de las trayectorias evolutivas de parálogos genéticos.
Principales resultados:
- Interacciones epistáticas identificadas que controlan la letalidad embrionaria recesiva en cruces de Arabidopsis.
- La evolución divergente de parálogos de un gen duplicado esencial explica estas incompatibilidades.
- Las copias funcionales del gen no están ubicadas de manera consistente en diferentes accesos, lo que lleva a la heterogeneidad.
Conclusiones:
- La duplicación genética y la extinción son factores importantes de las incompatibilidades genéticas.
- Estos mecanismos evolutivos pasivos contribuyen a la incompatibilidad generalizada entre las cepas.
- Tales incompatibilidades pueden representar una fuente fundamental de especiación en diversos taxones.
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The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
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