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- W2807350575 abstract "Our understanding of sequence variation in the HLA-DPB1 gene is largely restricted to the hypervariable antigen recognition domain (ARD) encoded by exon 2. Here, we employed a redundant sequencing strategy combining long-read and short-read data to accurately phase and characterise in full length the majority of common and well-documented (CWD) DPB1 alleles as well as alleles with an observed frequency of at least 0.0006% in our predominantly European sample set. We generated 664 DPB1 sequences, comprising 279 distinct allelic variants. This allows us to present the, to date, most comprehensive analysis of the nature and extent of DPB1 sequence variation. The full-length sequence analysis revealed the existence of two highly diverged allele clades. These clades correlate with the rs9277534 A → G variant, a known expression marker located in the 3'-UTR. The two clades are fully differentiated by 174 fixed polymorphisms throughout a 3.6 kb stretch at the 3'-end of DPB1. The region upstream of this differentiation zone is characterised by increasingly shared variation between the clades. The low-expression A clade comprises 59% of the distinct allelic sequences including the three by far most frequent DPB1 alleles, DPB1*04:01, DPB1*02:01 and DPB1*04:02. Alleles in the A clade show reduced nucleotide diversity with an excess of rare variants when compared to the high-expression G clade. This pattern is consistent with a scenario of recent proliferation of A-clade alleles. The full-length characterisation of all but the most rare DPB1 alleles will benefit the application of NGS for DPB1 genotyping and provides a helpful framework for a deeper understanding of high- and low-expression alleles and their implications in the context of unrelated haematopoietic stem-cell transplantation." @default.
- W2807350575 created "2018-06-13" @default.
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- W2807350575 date "2019-01-01" @default.
- W2807350575 modified "2023-10-13" @default.
- W2807350575 title "Patterns of non-ARD variation in more than 300 full-length HLA-DPB1 alleles" @default.
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- W2807350575 doi "https://doi.org/10.1016/j.humimm.2018.05.006" @default.
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