Association analysis of myosin IXB and type 1 diabetes

To date, seven studies have provided evidence for an association between the gene encoding for myosin IXB (MYO9B) and celiac disease (CD), and inflammatory bowel diseases, including single nucleotide polymorphisms (SNPs) rs2305767, rs1457092, and rs2305764. We investigated whether MYO9B is associated with T1D. The three SNPs were genotyped in Dutch samples from 288 T1D patients and 1615 controls. The A allele of SNP rs2305767A>G showed some evidence of association with T1D (nominal p for genotype = 0.06; OR carrier = 1.51, 95% CI = 1.04-2.19), but not in British samples from 4301 case patients and 4706 controls (p = 0.53), or when the Dutch and UK data were pooled (N patients = 4582, N controls= 6224; Mantel-Hansel p = 0.83). Furthermore, the nonsynonymous rs1545620 C>A SNP that has been associated with the inflammatory bowel disease, showed no association with T1D in British case-control set (p = 0.57). We conclude that MYO9B might not be a strong determinant of T1D, although there was some association in our initial Dutch study. Further studies are needed to evaluate the role of MYO9B in T1D.