title: Suggestive evidence for association of human chromosome 18q12-q21 and its orthologue on rat and mouse chromosome 18 with several autoimmune diseases.
abstract: Some immune system disorders, such as type 1 diabetes, multiple sclerosis (MS), and rheumatoid arthritis (RA), share common features: the presence of autoantibodies and self-reactive T-cells, and a genetic association with the major histocompatibility complex. We have previously published evidence, from 1,708 families, for linkage and association of a haplotype of three markers in the D18S487 region of chromosome 18q21 with type 1 diabetes. Here, the three markers were typed in an independent set of 627 families and, although there was evidence for linkage (maximum logarithm of odds score [MLS] = 1.2; P = 0.02), no association was detected. Further linkage analysis revealed suggestive evidence for linkage of chromosome 18q21 to type 1 diabetes in 882 multiplex families (MLS = 2.2; lambdas = 1.2; P = 0.001), and by meta-analysis the orthologous region (also on chromosome 18) is linked to diabetes in rodents (P = 9 x 10(-4)). By meta-analysis, both human chromosome 18q12-q21 and the rodent orthologous region show positive evidence for linkage to an autoimmune phenotype (P = 0.004 and 2 x 10(-8), respectively, empirical P = 0.01 and 2 x 10(-4), respectively). In the diabetes-linked region of chromosome 18q12-q21, a candidate gene, deleted in colorectal carcinoma (DCC), was tested for association with human autoimmunity in 3,380 families with type 1 diabetes, MS, and RA. A haplotype ("2-10") of two newly characterized microsatellite markers within DCC showed evidence for association with autoimmunity (P = 5 x 10(-6)). Collectively, these data suggest that a locus (or loci) exists on human chromosome 18q12-q21 that influences multiple autoimmune diseases and that this association might be conserved between species.
authors.affiliation: Wellcome Trust Centre for Molecular Mechanisms in Disease, University of Cambridge, UK. tony.merriman@stonebow.otago.ac.nz
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mesh_terms: D000818:Animals; D001172:Arthritis, Rheumatoid / Q000235:genetics; D001327:Autoimmune Diseases / Q000235:genetics*; D002874:Chromosome Mapping; D002887:Chromosomes, Human, Pair 18 / Q000235:genetics*; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics; D016163:Genes, DCC / Q000235:genetics; D008040:Genetic Linkage / Q000235:genetics*; D006239:Haplotypes; D006801:Humans; D051379:Mice / Q000235:genetics*; D018895:Microsatellite Repeats / Q000235:genetics; D009103:Multiple Sclerosis / Q000235:genetics; D010641:Phenotype; D051381:Rats / Q000235:genetics*; D017385:Sequence Homology