Haplotype-specific linkage disequilibrium patterns define the genetic topography of the human MHC.

Abstract:

:Detailed knowledge of linkage disequilibrium (LD) is regarded as a prerequisite for population-based disease gene mapping. Variable patterns across the human genome are now recognized, both between regions and populations. Here, we demonstrate that LD may also vary within a genomic region in a haplotype-specific manner. In 864 Caucasian unrelated individuals, we describe haplotype-specific LD patterns across the human MHC by the construction of gene-specific allelic haplotypes at 25 loci between HLA-A and Tapasin. Strong and extensive LD is found across both common and rare haplotypes, suggesting that haplotype structure is influenced by factors other than genetic drift, including both selection and differential haplotype recombination. Knowledge of haplotype-specific LD in the HLA may explain the apparent discrepant data from previous studies of global LD, help delineate key areas in mapping HLA-associated diseases and, together with recombination data, provide valuable information about a population's demographic history and the selective pressures operating on it.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Ahmad T,Neville M,Marshall SE,Armuzzi A,Mulcahy-Hawes K,Crawshaw J,Sato H,Ling KL,Barnardo M,Goldthorpe S,Walton R,Bunce M,Jewell DP,Welsh KI

subject

Has Abstract

pub_date

2003-03-15 00:00:00

pages

647-56

issue

6

eissn

0964-6906

issn

1460-2083

journal_volume

12

pub_type

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