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HLA-DQ2 (DQ2) is a serotype group within HLA-DQ (DQ) serotyping system. The serotype is determined by the antibody recognition of β 2 subset of DQ β-chains. The β-chain of DQ is encoded by HLA-DQB1 locus and DQ2 are encoded by the HLA-DQB1 *02 allele group. This group currently contains two common alleles, DQB1 *0201 and DQB1 *0202.
HLA typing has led to some improvement and acceleration in the diagnosis of celiac disease and type 1 diabetes; however, for DQ2 typing to be useful, it requires either high-resolution B1*typing (resolving *02:01 from *02:02), DQA1*typing, or DR serotyping. Current serotyping can resolve, in one step, DQ8.
An example of a serotype is DQ2. Recognize HLA-DQB1*02 gene products which include gene products of the following alleles: HLA-DQB1*02:01; HLA-DQB1*02:02; HLA-DQB1*02:03; Sometimes DQ2 antibodies recognize other gene products, such as DQB1*03:03, resulting in serotyping errors. Because of this mistyping serotyping is not as reliable as gene ...
HLA DR3-DQ2 is the serotypic representation of a HLA-DRB1:DQA1:DQB1 cis-chromosomal haplotype on human 6p21.3 in a region known as the HLA complex. The DR3-DQ2 haplotype is notable because of the very strong linkage between genes that extends into the HLA-A, -B and -C regions of the HLA gene complex in northern and northwestern Europe.
HLA A30-Cw5-B18-DR3-DQ2 (A30::DQ2) is a multigene haplotype that extends across a majority of the major histocompatibility complex on human chromosome 6. A multigene haplotype is a set of inherited alleles covering several genes, or gene-alleles. Long haplotypes, like A30::DQ2, are generally the result of descent by common ancestry.
Sensitivity can be improved by knowing the haplotype. In Europe, HLA-A1 is strongly linked to a 'chunk of chromosome' called a 'haplotype'. This haplotype, Super-B8, is A1-Cw7-B8-DR3-DQ2, about 2 million DNA codons (the nucleotide building blocks) long. This chunk has avoided recombination for thousands of years.
Prior to refined typing for HLA-DQ and DR, the association with HLA-A1 and B8 was identified for coeliac disease in 1973 and dermatitis herpetiformis in 1976 . [7] [8] Because of the haplotype it became possible to identify the genetic risk even though disease causing genes, a DQ2 haplotype, was 1.3 million nucleotides away
HLA(haplotypes) In terms of genetics one finds that autoimmune polyendocrine syndrome type 2 has an autosomal dominant pattern of inheritance, with an incomplete penetrance. [ 7 ] [ 8 ] Furthermore, the human leukocyte antigen involved in this condition are HLA-DQ2(DR3 (DQB*0201)) and HLA-DQ8(DR4 (DQB1*0302)), [ 9 ] genetically speaking , which ...