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In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
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Evolución e impacto funcional de la rara variación de codificación de la secuenciación profunda de exomas humanos
Jacob A Tennessen1, Abigail W Bigham, Timothy D O'Connor
1Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA.
Science (New York, N.Y.)
|May 19, 2012
Resumen
Este estudio secuenció genes humanos para encontrar variantes genéticas raras relacionadas con enfermedades complejas. La mayoría de las variantes identificadas eran raras, previamente desconocidas y específicas de la población, lo que destaca la necesidad de grandes tamaños de muestra en la investigación genética.
Área de la Ciencia:
- Genética La genética.
- La genómica es la genómica.
- Genética de la población Genética de la población.
Sus antecedentes:
- Comprender el papel de las variantes genéticas raras en enfermedades complejas es crucial.
- Estudios anteriores han tenido un alcance limitado en la identificación de variantes raras en diversas poblaciones.
Objetivo del estudio:
- Investigar el panorama de las variantes raras de un solo nucleótido (SNV) en los genes codificadores de proteínas.
- Evaluar la frecuencia y el impacto funcional de estos SNV en individuos de ascendencia europea y africana.
- Informar futuros estudios sobre la arquitectura genética de enfermedades complejas.
Principales métodos:
- Secuenciación del genoma completo de 15.585 genes humanos codificadores de proteínas en 2440 individuos.
- Llamado variante y anotación para identificar SNVs.
- Análisis de la frecuencia de la variante, la novedad, la especificidad de la población y el impacto funcional previsto.
Principales resultados:
- Se han identificado más de 500.000 SNV, de las cuales el 86% son raras (MAF < 0,5%).
- El 82% de los SNV identificados eran previamente desconocidos y específicos de la población.
- Se predijo que aproximadamente el 2,3% de los SNV transportados por individuo afectarían la función de las proteínas, siendo el 95,7% de estos raros.
- Exceso de variantes funcionales raras atribuidas al reciente crecimiento de la población y a la escasa selección purificadora.
Conclusiones:
- Las variantes raras son abundantes y a menudo funcionalmente significativas, lo que plantea desafíos para los estudios complejos de asociación de enfermedades.
- Los tamaños de muestra grandes son esenciales para asociar de manera robusta las variantes raras con rasgos complejos.
- Este estudio proporciona un conjunto de datos fundamentales para futuras investigaciones genéticas sobre enfermedades complejas.
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