The association of glucokinase(GCK) gene with type 2 diabetes in Chinese was studied by using the polymerase-chain-reaction amplified microsatellite polymorphism marker, GCK-5'. In comparison with non-diabetics,allele 4 was significantly increased in type 2 diabetics(X2 = 6. 773,P=0. 009). The frequency of genotype 44 and 4X was significantly higher in type 2 diabetics than in non-di-abetics(X2 = 6. 439, P = 0.011). The allelic frequency difference was also observed in overweight/obese subgroup compariscn(X2 = 7. 718,P = 0. 021). The risk of type 2 diabetes in Chinese with genotype 44 or 4X is about 3. 6 times higher than in Chinese with genotype XX. Our results indicate that GCK is associated with type 2 diabetes in Chinese.

The plasma fructosamine (FTS) level in 141 diabetics (2.99?0.69 mmol/L) was significantly higher than that in 42 non-diabetics (2.18?0.27 mmol/L), (P

ObjectiveTo investigate the association between a new identified Gly82Ser polymorphism of RAGE gene and diabetic microangiopathy,a case control study of 260 Chinese subjects (including 156 type 2 diabetics with or without nephropathy or retinopathy and 104 non diabetic control) was performed.MethodsGenotype frequencies of Gly82Ser polymorphism were studied by PCR RFLP analysis with AluI digestion.ResultsThe most frequent genotype and allele of Gly82Ser polymorphism of RAGE gene in Chinese were genotype GG and allele G.Their frequency distribution showed significant difference between Chinese and Caucasian.There was no difference in genotype frequencies or allele frequencies between type 2 diabetic patients (DN 0) and the control subjects.Genotype and allele frequencies did not differ in type 2 diabetic subjects with nephropathy or without nephropathy.Moreover,there were no associations between diabetic patients with or without retinopathy in genotype and allele frequencies as well (two tailed Fisher’s exactP >0.05).ConclusionOur results showed that Gly82Ser polymorphism in RAGE gene was not associated with diabetic microangiopathy,which suggests that these genetic variants may not be involved in the mechanism of diabetic microangiopathy in Chinese type 2 diabetics.

The deficiency in islet ?-cell secretion and (or) the decrease in insulin sensitivity of target tissue are the important pathophysiological mechanisms of diabetes. The methods for the assessment and evaluation of ?-cell function can be divided into: pulsatile insulin secretion, glucose secretagogues, non-glucose secretagogues (phase, peak value and duration) and other secretions. While the suitable method was chosen for the evaluation of ?-cell function, the sensitivity and specificity of different methods in the natural history of diabetes and the objective of evaluation should be all taken into account.

0.05).Conclusion In Chinese,ApoE allele ?2 may be a risk factor for developing diabetic nephropathy complication.No correlation between ApoE gene polymorphism and type 2 diabetes mellitus was found in Chinese.

Objective To study the impact of single nucleotide polymorphism 43 (UCSNP43) of calpain 10 gene (CAPN 10) at NIDDM1 locus, chromosome 2q37.3 on glucose intolerance status and its intermediate traits. Methods The studied population consisted of 320 Chinese subjects in Shanghai 〔normal glucose tolerance (NGT) 148, impaired glucose tolerance (IGT) 44 and type 2 diabetes (T2DM) 128〕. Plasma glucose, insulin, C peptide and free fatty acid levels were measured during fasting and 30, 60, 120 and 180 min after oral 75 g glucose load. The tissue insulin sensitivity and islet beta cell insulin secretion were assessed by HOMA formulae and the ratio of the increment of insulin and glucose levels at 30 min. The CAPN 10 UCSNP43 was genotyped by DNA direct sequencing. Results (1) The frequencies of GG, GA and AA genotypes of CAPN 10 UCSNP 43 were 0.80, 0.18 and 0.02 respectively. The G allele frequency was 0.89, which was statistically significant higher than those in Caucasians, Mexican Americans and Pima Indians (all P

Objective To use the extended hyperinsulinemic euglycemic clamp technique for the study of insulin sensitivity in normal weight and normal glucose tolerant obese Chinese, and also, for the study of insulin sensitivity in relation to body adipose depots and distribution. Methods Twenty two Chinese 〔9 with normal weight (BMI

Objective To establish an extended hyperinsulinemic euglycemic clamp for the study of insulin sensitivity in Chinese. Methods Combining glucose clamp, 3 3H labelled glucose tracer technique and indirect calorimetry, an extended hyperinsulinemic euglycemic clamp technique was applied into the study of methodology in 9 normal weight subjects with normal glucose tolerance. Results (1) When a higher level of insulin was created during maintaining euglycemia, hepatic glucose production was completely inhibited, and the counter regulatory hormones (including cortisol, growth hormone and glucagon) and endogenous insulin secretion were not significantly stimulated. (2) During the steady state of the extended hyperinsulinemic euglycemic clamp, the insulin mediated glucose disappearance rate was significantly increased compared with basal state 〔(5.86?0.65)mg?kg -1 ?min -1 vs (2.45?0.15)mg?kg -1 ?min -1 , P

Objective To explore the relationship between 677C/T polymorphism of methy lenetetrahydrofolate reductase (MTHFR) gene and diabetic macrovascular complications (including cerebral infarction and coronary heart disease) in Shanghai.Methods Among 416 Chinese subjects, 216 were in macrovascular disease group 〔the atherosclerosis (AS) group〕 which included cerebral infarction (CI) subgroup consisting of 111 subjects (50 cases with and 61 without diabetes) and coronary heart disease (CHD) subgroup consisting of 105 subjects (48 with and 57 without diabetes); 100 subjects were in diabetes group without macrovascular disease (DM); and 100 normal subjects in control group (C). Genotypes were determined by PCR/restriction enzyme digestion and the relationship between 677C/T polymorphism and diabetic macrovascular complications was studied by population based association analysis. Results The frequencies of MTHFR TT genotype and T allele were significantly higher in macrovascular disease group. Logistic regression analysis showed that MTHFR gene was a potential contributor to AS. Comparison of genotype frequencies between diabetic and non diabetic subgroups in macrovascular disease group revealed no difference. Significant difference of high density lipoprotein cholesterol and diastolic blood pressure between different genotype subgroups was observed within some macrovascular disease groups after stratification by sex and diabetes. Conclusion MTHFR contributes to the development of macroangiopathy (cerebral infarction and coronary heart disease) whether associated with type 2 diabetes or not in Shanghai district.

Objective To explore the possible association of single nucleotide polymorphism (SNP) rs3738435 of muscarinic acetylcholine receptor subtype M3 gene (cholinergic receptor, muscarinic 3, CHRM3) with risk of type 2 diabetes mellitus (DM) and metabolic disturbance. Methods The genotypes of T-149C variant of CHRM3 gene were determined by PCR-RFLP in 573 Chinese individuals in Shanghai, including 220 newly-diagnosed type 2 DM patients without taking any drug and 353 subjects with normal glucose tolerance (NGT). In the subjects, height and weight were measured for body mass index(BMI), waist, hip and femoral circumstances for waist-to-hip ratio (WHR) and waist-to-femur ratio (WFR), and serum lipid level including total cholesterol, triglyceride, high-density and low-density lipoprotein cholesterol, blood pressure, plasma glucose levels both at 0 and 120 minute during oral 75 g glucose tolerance test (OGTT) were also determined. Results (1) There was no statistical difference in the gene frequency between groups of type 2 DM and NGT. (2) In the group of type 2 DM, significant differences were observed between TT genotype carriers and TC+CC genotypes carriers for BMI, with an obvious increase in TY genotype carriers [(26.99±3.59vs25.34±3.48)kg/m2, P=0.001]. (3) In the subgroup of type 2 DM with BMI≥25 kg/m2, total cholesterol was higher in TT genotypes than in TC+CC genotypes[(5.75±1.26vs5.27±1.14)mmol/L, P=0.030], so was the low-density lipoprotein cholesterol. Conclusion The genetic variation T-149C in the CHRM3 gene seems to attribute to weight regulation and lipid metabolism of patients with type 2 diabetes mellitus in Chinese population.