DQB10602containing

DQB10602containing refers to the presence of the HLA-DQB106:02 allele, or haplotypes that include this allele, in an individual. The HLA-DQB1 gene encodes a component of the HLA-DQ class II molecule, which presents peptide antigens to CD4+ T cells and influences immune responses. DQB106:02 is one of the better-studied variants in the HLA region and is found across diverse populations.

Clinical significance: DQB106:02 is strongly associated with narcolepsy type 1 (narcolepsy with cataplexy). A high proportion of people with narcolepsy carry this allele, while many people who carry it do not develop the condition. Consequently, DQB106:02 testing can support research and, in some cases, clinical assessment, but it is not a diagnostic test on its own.

Genetic context: DQB106:02 is often found with specific DQA1 alleles to form DQ6.02-containing haplotypes. This association has contributed to the autoimmune hypothesis of narcolepsy, suggesting immune-mediated mechanisms in disease pathogenesis, though a direct causal pathway has not been established.

Population considerations: The frequency of DQB106:02 varies by ethnicity and population, influencing the interpretation of test results and the design of genetic studies related to narcolepsy and other conditions linked to the HLA region.

See also: HLA-DQB1, HLA-DQ molecules, narcolepsy, autoimmune hypotheses in narcolepsy, HLA typing.