The noncoding regions of HLA-DRB uncover interlineage recombinations as a mechanism of HLA diversification - PubMed

The noncoding regions of HLA-DRB uncover interlineage recombinations as a mechanism of HLA diversification

K Kotsch et al. J Immunol. 2000.

Abstract

The mechanisms generating new alleles at the MHC loci are still unknown in detail, and several proposals have been made to explain the extent of polymorphism. The patchwork pattern of polymorphism in the 2nd exon of HLA-DRB1 recommends this locus as a model for the study of the potential of interallelic gene conversion. In general, the inference of gene conversion-like events based exclusively on exon sequence comparisons may be misleading because the identity of the putative donor allele remains unknown. In this study, we describe five alleles of the HLA-DRB1 gene, which intron regions give evidence for interlineage recombination events either strictly located at the 2nd exon or involving the adjacent introns. Furthermore, we show that the noncoding regions provide important clues to the mechanisms of the generation of new alleles, and our results indicate that interlineage recombinations may be hidden and are perhaps more frequent than currently expected.

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