Diabetes, Vol 46, Issue 6 1069-1074, Copyright © 1997 by American Diabetes Association
Analysis of candidate genes for susceptibility to type I diabetes: a case-control and family-association study of genes on chromosome 2q31-35
D Owerbach, FJ Naya, MJ Tsai, SV Allander, DR Powell and KH Gabbay
Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030, USA. davido@mbcr.bcm.tmc.edu
Recent genome searches suggest a putative linkage of many loci to
susceptibility to type I diabetes. The chromosome 2q31-35 region is
reported to be linked to susceptibility to type I diabetes and is thought
to contain several diabetes susceptibility loci. These candidate genes
include the HOXD gene cluster, BETA2, CTLA4, CD28, IGFBP2, and IGFBP5.
Association studies in populations and families are required to confirm
and/or identify the actual susceptibility loci. We hereby report several
previously unknown DNA polymorphisms for HOXD8, BETA2, and IGFBP5, which we
have used along with previously known polymorphisms of HOXD8 and CTLA4 to
test whether these candidate loci are the susceptibility genes on
chromosome 2q31-35. Using a case-control design with a subsequent
family-association approach to confirm associations, we find no evidence
that these candidate genes are associated with susceptibility to type I
diabetes.