Association of mitochondrial deoxyribonucleic acid 16189 variant (T->C transition) with metabolic syndrome in Chinese adults.
OBJECTIVE
A common variant in mitochondrial DNA (mtDNA) at bp 16189 (T-->C transition) has been associated with small birth size, adulthood hyperglycemia, and insulin resistance in Caucasians. In this study, we investigated whether mtDNA 16189 variant is associated with metabolic syndrome in Chinese subjects.


METHODS
Six hundred fifteen Chinese adults, aged 40 yr or older, were recruited in this study. The 16189 variant of mtDNA was detected using PCR and restriction enzyme digestion. Metabolic syndrome was diagnosed on modified National Cholesterol Education Program Adult Treatment Panel III guidelines, using body mass index (BMI) instead of waist circumference. An association study was performed with chi2 test and logistic regression analysis.


RESULTS
The prevalence of the 16189 variant was higher in patients with metabolic syndrome than in those without: 44% (125 of 284) vs. 33.2% (110 of 331) (P = 0.006). The association between this 16189 variant of mtDNA and metabolic syndrome (P = 0.021) remained significant even after correcting for age and BMI. As to the individual traits, the prevalence of fasting plasma glucose of at least 110 mg/dl (> or =6.1 mmol/liter) [(51.5% (121 of 235) vs. 42.1% (160 of 380); P = 0.023], type 2 diabetes mellitus [48.1% (113 of 235) vs. 39.2% (149 of 380); P = 0.031], and hypertriglyceridemia [44.3% (104 of 235) vs. 35.8% (136 of 380); P = 0.037] were significantly higher in subjects harboring the 16189 variant of mtDNA than those with the wild type. However, the prevalence of hypertension [53.2% (125 of 235) vs. 47.6% (181 of 380); P = 0.180], BMI greater than 25 kg/m2 [48.5% (114 of 235) vs. 43.9% (167 of 380); P = 0.270], and low high-density lipoprotein cholesterol [61.3% (144 of 235) vs. 54.7% (208 of 380); P = 0.111] did not reach a significant difference between the two groups. Furthermore, there was a trend of increasing frequency of occurrence of the 16189 variant in individuals having an increasing number of components of metabolic syndrome (Ptrend < 0.005).


CONCLUSIONS
Our data strongly suggest that mtDNA 16189 variant underlies susceptibility to metabolic syndrome in the Chinese population.
Weng
Shao-Wen
SW
Department of Internal Medicine, Chang Gung Memorial Hospital, 123 Ta-Pei Road, Niao-sung Hsiang, Kaohsiung Hsien, Taiwan 833.
Liou
Chia-Wei
CW
Lin
Tsu-Kung
TK
Wei
Yau-Huei
YH
Lee
Cheng-Feng
CF
Eng
Hock-Liew
HL
Chen
Shang-Der
SD
Liu
Rue-Tsuan
RT
Chen
Jung-Fu
JF
Chen
I-Ya
IY
Chen
Ming-Hong
MH
Wang
Pei-Wen
PW
D000368:Aged; D044466:Asian People / Q000235:genetics*; D001786:Blood Glucose / Q000378:metabolism; D016022:Case-Control Studies; D003596:Cytosine; D004272:DNA, Mitochondrial / Q000235:genetics*; D003924:Diabetes Mellitus, Type 2 / Q000453:epidemiology / Q000235:genetics; D005215:Fasting / Q000097:blood; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D014644:Genetic Variation; D006801:Humans; D015228:Hypertriglyceridemia / Q000453:epidemiology / Q000235:genetics; D008297:Male; D024821:Metabolic Syndrome / Q000235:genetics*; D008875:Middle Aged; D015995:Prevalence; D013941:Thymine
D001786:Blood Glucose; D004272:DNA, Mitochondrial; D003596:Cytosine; D013941:Thymine