Estudio de asociación genómica de los VNC en 16.000 casos de ocho enfermedades comunes y 3.000 controles compartidos
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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
Published on: February 21, 2015
Nature
|April 3, 2010
Resumen
Las variantes comunes de número de copias (CNV) juegan un papel en la susceptibilidad genética a enfermedades comunes. Sin embargo, este estudio encontró que es poco probable que los VNC comunes, detectables por la tecnología actual, sean los principales contribuyentes a la base genética de estas afecciones.
Área de la Ciencia:
- Genética La genética.
- La genómica es la genómica.
- Estudios de asociación de enfermedades Estudios de asociación de enfermedades.
Sus antecedentes:
- Las variantes del número de copias (CNV) son una fuente significativa de variación genética humana.
- Se supone que las CNV influyen en la susceptibilidad a enfermedades comunes.
Objetivo del estudio:
- Para llevar a cabo un estudio de asociación a gran escala y en todo el genoma que investigue el vínculo entre los VNC y ocho enfermedades humanas comunes.
- Determinar la contribución de las CNV comunes a la arquitectura genética de las enfermedades prevalentes.
Principales métodos:
- Genotipización de aproximadamente 19,000 individuos a través de 3,432 CNV polimórficos utilizando una matriz personalizada.
- El análisis incluyó la identificación de artefactos técnicos, pruebas de asociación y estudios de replicación.
Principales resultados:
- Artefactos técnicos identificados, como las diferencias de la fuente de ADN, que pueden causar asociaciones de falsos positivos.
- Se han confirmado asociaciones entre los VNC y enfermedades específicas en tres loci (IRGM para la enfermedad de Crohn, HLA para la enfermedad de Crohn, artritis reumatoide y diabetes tipo 1, TSPAN8 para la diabetes tipo 2).
- Estos loci fueron previamente identificados a través de estudios de polimorfismo de nucleótido único (SNP), lo que indica que las CNV comunes a menudo están etiquetadas por SNPs.
Conclusiones:
- Es poco probable que los VNC comunes, en particular los detectables por las plataformas actuales, sean los principales impulsores de enfermedades humanas comunes.
- La mayoría de las CNV comunes están bien etiquetadas por SNP, lo que sugiere que su contribución potencial ha sido evaluada indirectamente en investigaciones previas basadas en SNP.
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