title: No evidence of type 1 diabetes susceptibility genes in the region centromeric of the HLA complex.
abstract: There is strong evidence that DQB1, DQA1, and DRB1 alleles are not the only contributors to the human leukocyte antigen (HLA) linked type 1 diabetes (T1D) predisposition. Although the HLA complex is much studied for disease association, little is known about the neighboring centromeric region. We have previously found suggestive association on DQ2-DR3 haplotypes for marker D6S291, located 3.6-Mb centromeric of HLA-DQB1. This region on human chromosome 6 is syntenic to a part of the region adjacent to the mouse major histocompatibility complex (MHC) on chromosome 17, which has been suggested to harbor a susceptibility gene in mouse (Idd16). To evaluate a possible role of the region centromeric of HLA-DQB1 in human T1D, we have scanned the region with nine microsatellite markers in 267 T1D families from five different populations. Our results indicate that the characteristic strong linkage disequilibrium in the HLA complex does not extend into this region. Furthermore, we did not detect any consistent T1D association for the markers analyzed in the study. In conclusion, our data argue against the presence of any strong genetic susceptibility factors for T1D in the region centromeric of the HLA complex.
authors.affiliation: Institute of Immunology, Rikshospitalet University Hospital, Oslo, Norway. Stefan.johansson@pedi.uib.no
authors.forename: Stefan
authors.initials: S
authors.lastname: Johansson
authors.forename: Benedicte A
authors.initials: BA
authors.lastname: Lie
authors.forename: Anne
authors.initials: A
authors.lastname: Cambon-Thomsen
authors.forename: Flemming
authors.initials: F
authors.lastname: Pociot
authors.forename: Jørn
authors.initials: J
authors.lastname: Nerup
authors.forename: Ingrid
authors.initials: I
authors.lastname: Kockum
authors.forename: Erik
authors.initials: E
authors.lastname: Thorsby
authors.forename: Dag E
authors.initials: DE
authors.lastname: Undlien
mesh_terms: D000483:Alleles; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics / Q000276:immunology* / Q000378:metabolism; D020022:Genetic Predisposition to Disease; D006649:Histocompatibility Antigens / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D006801:Humans; D015810:Linkage Disequilibrium; D018895:Microsatellite Repeats
chemical_list: D006649:Histocompatibility Antigens