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Origen y propagación de genes de novo en las poblaciones de Drosophila melanogaster
Li Zhao1, Perot Saelao, Corbin D Jones
1Department of Evolution and Ecology, University of California, Davis, CA 95616, USA.
Science (New York, N.Y.)
|January 25, 2014
Resumen
Nuevos genes, llamados genes de novo, pueden originarse de ADN no genético. Los investigadores encontraron estos nuevos genes expresados por los testículos en las moscas de la fruta, lo que demuestra que la selección natural impulsa su propagación y revela el dinamismo del contenido genético.
Área de la Ciencia:
- * La genómica evolutiva de los genomas
- * Evolución molecular * Evolución molecular
- * Genética de poblaciones.
Sus antecedentes:
- * La genómica comparativa indica que los genes pueden surgir de secuencias previamente no genéticas.
- * Los orígenes y la propagación a nivel de población de estos genes de novo no se comprenden bien.
- * Comprender el nacimiento de genes de novo es crucial para comprender la evolución del genoma.
Objetivo del estudio:
- * Investigar el origen y la dinámica evolutiva de los genes de novo en Drosophila melanogaster.
- * Para determinar la fuente de las secuencias que dan lugar a nuevos genes.
- * Evaluar el papel de la selección natural en la fijación y propagación de genes de novo dentro de una población.
Principales métodos:
- * Análisis genómicos comparativos de las poblaciones de Drosophila melanogaster.
- * Identificación y caracterización de genes de novo segregantes y fijos expresados en el testículo.
- * Análisis de los orígenes genéticos de ancestrales intergenéticos y marcos de lectura abiertos no expresados.
Principales resultados:
- * Se identificaron 142 genes segregadores y 106 genes de novo expresados por testículos fijos en la población estudiada de moscas de la fruta.
- * Los genes de novo se originaron predominantemente de ancestrales intergénicos, marcos de lectura abiertos no expresados.
- * La evidencia sugiere que la selección natural influyó significativamente en la propagación y fijación de estos nuevos genes.
Conclusiones:
- * El estudio revela un proceso dinámico de evolución del contenido genético en Drosophila.
- * Las secuencias no genéticas ancestrales sirven como una fuente significativa para la aparición de nuevos genes.
- * La selección natural moldea activamente el destino de los genes recién originados dentro de las poblaciones.
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