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Análisis comparativos de secuencias de múltiples especies de regiones genómicas específicas
J W Thomas1, J W Touchman, R W Blakesley
1Genome Technology Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland 20892,USA.
Nature
|August 15, 2003
Resumen
La comparación de los genomas de los vertebrados revela un ADN no codificante conservado, que ofrece información sobre la evolución del genoma. Este estudio identificó nuevos segmentos conservados que no se encontraron a través de comparaciones simples entre pares.
Área de la Ciencia:
- La genómica es la genómica.
- La genómica comparada es una genómica comparada.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- El análisis comparativo de la secuencia genómica es crucial para comprender la evolución del genoma e identificar elementos funcionales.
- Las regiones no codificantes conservadas, incluidos los elementos reguladores, son clave para descifrar la función del genoma.
- La secuenciación dirigida de genomas de vertebrados evolutivamente diversos complementa los enfoques de genoma completo.
Objetivo del estudio:
- Para generar y analizar más de 12 megabases (Mb) de secuencia de 12 especies de vertebrados.
- Para comparar una región genómica específica ortóloga al cromosoma humano 7, incluido el gen de la fibrosis quística.
- Identificar segmentos codificantes y no codificantes conservados y comprender la dinámica del genoma.
Principales métodos:
- Secuenciación y análisis comparativo de regiones genómicas específicas en 12 diversas especies de vertebrados.
- Identificación de segmentos no codificantes conservados utilizando comparaciones entre varias especies.
- Análisis de inserciones de elementos transponibles para inferir la dinámica del genoma.
Principales resultados:
- Más de 12 Mb de datos de secuencia generados y analizados de 12 especies de vertebrados.
- Identificación de numerosos segmentos no codificantes conservados, muchos indetectables por comparaciones entre pares.
- Caracterización de la dinámica del genoma, confirmando a los roedores como un grupo hermano de los primates basado en inserciones de elementos transponibles.
Conclusiones:
- La genómica comparativa de las regiones objetivo revela importantes elementos no codificantes conservados cruciales para la función.
- La comparación de secuencias de múltiples especies es esencial para descubrir elementos conservados más allá del análisis en pares.
- La dinámica del genoma varía significativamente entre las especies, proporcionando información sobre las relaciones evolutivas.
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