Analysis of 6,515 exomes reveals the recent origin of most human protein-coding variants.
Nature
; 493(7431): 216-20, 2013 Jan 10.
Article
em En
| MEDLINE
| ID: mdl-23201682
ABSTRACT
Establishing the age of each mutation segregating in contemporary human populations is important to fully understand our evolutionary history and will help to facilitate the development of new approaches for disease-gene discovery. Large-scale surveys of human genetic variation have reported signatures of recent explosive population growth, notable for an excess of rare genetic variants, suggesting that many mutations arose recently. To more quantitatively assess the distribution of mutation ages, we resequenced 15,336 genes in 6,515 individuals of European American and African American ancestry and inferred the age of 1,146,401 autosomal single nucleotide variants (SNVs). We estimate that approximately 73% of all protein-coding SNVs and approximately 86% of SNVs predicted to be deleterious arose in the past 5,000-10,000 years. The average age of deleterious SNVs varied significantly across molecular pathways, and disease genes contained a significantly higher proportion of recently arisen deleterious SNVs than other genes. Furthermore, European Americans had an excess of deleterious variants in essential and Mendelian disease genes compared to African Americans, consistent with weaker purifying selection due to the Out-of-Africa dispersal. Our results better delimit the historical details of human protein-coding variation, show the profound effect of recent human history on the burden of deleterious SNVs segregating in contemporary populations, and provide important practical information that can be used to prioritize variants in disease-gene discovery.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Variação Genética
/
Fases de Leitura Aberta
/
Evolução Molecular
/
Exoma
Tipo de estudo:
Prognostic_studies
Limite:
Humans
País/Região como assunto:
Africa
/
America do norte
/
Europa
Idioma:
En
Revista:
Nature
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos