Relationship between the T3394C mutation of the mitochondrial DNA ND1 gene and type 2 diabetes mellitns in the elderly Chinese Han people in Zhejiang / 中华老年医学杂志

ABSTRACT

ObjectiveTo explore the relationship between the T3394C mutation of the mitoehondrial DNA ND1 gene and type 2 diabetes mellitus (T2DM) in the elderly. MethodsDirect sequencing of PCR product was applied to study the T3394C mutation of mitochondrial DNA in 340 unrelated individuals in T2DM patients (90 cases of elderly patients, 250 cases of non-elderly patients) and 265 normal controls (130 cases of elderly controls, 135 cases of non-elderly controls) from Zhejiang province. The mutation was analyzed by DNASTAR and Antheprot 5.0 softwares. ResultsThe T3394C mutation of mitochondrial DNA was found in 5 of 90 elderly T2DM patients (5.6%),1 of 130 elderly controls(0.8%), and 2 of 250 non-elderly T2DM patients (0.8%). The incidence of the mutation was significantly different between the elderly T2DM patients and elderly controls(P＜0.05), as well as between the elderly T2DM patients and non-elderly T2DM patients(P＜0.05). The T3394C mutation caused the change of the ND1 protein secondary structure. ConclusionsThe T3394C mutation of the mitochondrial DNA ND1 gene may contribute to the pathogenesis of T2DM in the elderly with other genetic and environment factors.