- Longevity Association
- Study Design
- The longevous groups included two independent cohorts totalling 533 centenarians and 163 nonagenarian siblings. Control group included 2950 subjects.
- DR7 frequency was elevated in longevous men and DR13 frequency was increased in centenarians. DR11's influence on longevity displayed a significant interaction with sex, with an increase in women from longevous sibships. HLA-DR homozygotes were more frequent in centenarians than in controls.
- HGNC symbol
- SS1; DRB1; HLA-DRB; HLA-DR1B
- Common name
- major histocompatibility complex, class II, DR beta 1
- HLA-DRB1 belongs to the HLA class II beta chain paralogs. The class II molecule is a heterodimer consisting of an alpha (DRA) and a beta chain (DRB), both anchored in the membrane. It plays a central role in the immune system by presenting peptides derived from extracellular proteins. Class II molecules are expressed in antigen presenting cells (APC: B lymphocytes, dendritic cells, macrophages). The beta chain is approximately 26-28 kDa. It is encoded by 6 exons. Exon one encodes the leader peptide; exons 2 and 3 encode the two extracellular domains; exon 4 encodes the transmembrane domain; and exon 5 encodes the cytoplasmic tail. Within the DR molecule the beta chain contains all the polymorphisms specifying the peptide binding specificities. Hundreds of DRB1 alleles have been described and typing for these polymorphisms is routinely done for bone marrow and kidney transplantation. DRB1 is expressed at a level five times higher than its paralogs DRB3, DRB4 and DRB5. DRB1 is present in all individuals. Allelic variants of DRB1 are linked with either none or one of the genes DRB3, DRB4 and DRB5. There are 4 related pseudogenes: DRB2, DRB6, DRB7, DRB8 and DRB9. [provided by RefSeq, Jul 2008]
- Other longevity studies of this gene
- Entrez Gene
- View on HapMap
Homologs in model organisms
No homologs found