Novel mitochondrial 16S rRNA mutation, 3200T-->C, associated with adult-onset type 2 diabetes.

Abstract:

OBJECTIVE:To investigate the role of a potential diabetes-related mitochondrial region, which includes two previously reported mutations, 3243A-->G and 3316G-->A, in Chinese patients with adult-onset type 2 diabetes. METHODS:A total of 277 patients and 241 normal subjects were recruited for the study. Mitochondrial nt 3116 - 3353, which spans the 16S rRNA, tRNA(leu(UUR)) and the NADH dehydrogenase 1 gene, were detected using polymerase chain reaction (PCR), direct DNA sequencing, PCR-restriction fragment length polymorphism and allele-specific PCR. Variants were analyzed by two-tailed Fisher exact test. The function of the variants in 16S rRNA were predicted for minimal free energy secondary structures by RNA folding software mfold version 3. RESULTS:Four homoplasmic nucleotide substitutions were observed, 3200T-->C, 3206C-->T, 3290T-->C and 3316G-->A. Only the 3200T-->C mutation is present in the diabetic population and absent in the control population. No statistically significant associations were found between the other three variants and type 2 diabetes. The 3200T-->C and 3206C-->T nucleotide substitutions located in 16S rRNA are novel variants. The 3200T-->C caused a great alteration in the minimal free energy secondary structure model while the 3206C-->T altered normal 16S rRNA structure little. CONCLUSIONS:The results suggest that the 3200T-->C mutation is linked to the development of type 2 diabetes, but that the other observed mutations are neutral. In contrast to the Japanese studies, the 3316G-->A does not appear to be related to type 2 diabetes.

journal_name

Chin Med J (Engl)

journal_title

Chinese medical journal

authors

Yang T,Lam CW,Tsang MW,Tong SF,Kam GY,Chan LY,Poon PM,Wu X,Pang CP

keywords:

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

753-8

issue

5

eissn

0366-6999

issn

2542-5641

journal_volume

115

pub_type

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