1. Distribution of killer cell immunoglobulin-like receptor genes and 2DS4 alleles in the Chinese Han population
- Author
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Bao, Xiaojing, Hou, LiHua, Sun, Aining, Qiu, Qiaocheng, Yuan, Xiaoni, Chen, Minghua, Chen, Zixing, and He, Jun
- Subjects
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CELL receptors , *IMMUNOGLOBULINS , *KILLER cells , *ALLELES , *NUCLEOTIDE sequence , *STEM cell transplantation , *HEMATOPOIETIC stem cells , *HUMAN population genetics , *CHINESE people - Abstract
Abstract: Killer cell immunoglobulinlike receptors (KIRs) are a diverse family of receptors on natural killer cells. The KIR2DS4-deleted variant differs from the normal KIR2DS4 sequence by a 22-bp deletion in exon 5, which causes a frame shift, yielding a truncated KIR2DS4 protein with loss of the transmembrane and cytoplasmic domains of the full-length KIR2DS4 protein. A sequence-based testing and TOPO TA cloning system identifying and distinguishing alleles of the KIR2DS4 gene was established. The method was applied to 150 Chinese Han individuals: 75 patients who received T-depleted hematopoietic stem cells transplantation and their unrelated donors, establishing frequencies of 2DS4 allele and KIR gene within the local population. A majority (139) of the 150 samples (92.7%) were positive for KIR2DS4. The ratio of deleted to nondeleted versions of KIR2DS4 was approximately 1:2. Three KIR2DS4 novel alleles were identified. Forty-four percent individuals carried two group A haplotypes. The 17 KIR gene loci were found in 21.3%–100% in the population. Our findings suggest that the Chinese Han population is distinct in KIR gene frequencies and 2DS4 allele frequencies in comparison with some other populations. [Copyright &y& Elsevier]
- Published
- 2010
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