title: An autoimmune diabetes locus (Idd21) on mouse chromosome 18.
abstract: Twenty-four named Idd loci that contribute to the development of autoimmune diabetes in the nonobese diabetic (NOD) mouse have been mapped by linkage and congenic analysis. Previously, meta-analysis of genome-wide linkage scans supported the existence of a locus for susceptibility to autoimmune phenotypes on rodent Chromosome (Chr) 18, in a position orthologous to the human typc 1 diabetes susceptibility locus IDDM6 (human Chr 18q12-q23). However, an autoimmune diabetes susceptibility locus has not previously been reported on mouse Chr 18. In this study, we demonstrate linkage of the majority of mouse Chr 18 to diabetes in a (ABH x NOD)F1 x NOD backcross. Congenic analysis, introgressing at least 92% of Biozzi ABH Chr 18 onto the NOD background, confirmed the presence of a diabetes locus. The chromosome substitution strain (NOD.ABH-Chr18) had reduced diabetes incidence compared with NOD mice (P < 0.0001). We have named the Chr 18 diabetes locus Idd21.
authors.affiliation: Department of Biochemistry, University of Otago, Dunedin, New Zealand.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Hall
authors.forename: Jade E
authors.initials: JE
authors.lastname: Hollis-Moffatt
authors.forename: Marilyn E
authors.initials: ME
authors.lastname: Merriman
authors.forename: Rachel A
authors.initials: RA
authors.lastname: Green
authors.forename: David
authors.initials: D
authors.lastname: Baker
authors.forename: Tony R
authors.initials: TR
authors.lastname: Merriman
mesh_terms: D000483:Alleles; D000818:Animals; D002874:Chromosome Mapping; D002875:Chromosomes / Q000235:genetics*; D003433:Crosses, Genetic; D003922:Diabetes Mellitus, Type 1 / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D008040:Genetic Linkage / Q000235:genetics*; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D015994:Incidence; D008297:Male; D051379:Mice; D038602:Mice, Biozzi; D020297:Mice, Congenic; D008810:Mice, Inbred C57BL; D016688:Mice, Inbred NOD; D010641:Phenotype