摘要
目的:探讨线粒体DNAtRNALeu(UUR)基因及其相邻的ND1基因8个位点的突变与2型糖尿病的关系。方法:采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)的分析方法,对174例2型糖尿病患者和207名健康对照的mtDNA的3243、3256、3290、3316、3394、3421、3426、3460和3593共9个已报道的突变位点同时进行筛选,并采用测序、反向斑点杂交和基因芯片进行方法学比较和确证,对检出的突变位点采用DNASTAR和Antherprot软件进行分析。结果:糖尿病组检出3316(G→A)突变5例(2.9%),其中2例为多个位点突变:1例伴随3256(C→T)和3688(G→C),另1例伴随3606(A→G);3394(T→C)突变4例(2.3%),3593(T→C)、3290(T→C)和3618(T→C)突变各1例(0.6%);其中3606(A→G)、3618(T→C)和3688(G→C)为新突变位点,GenBank登录号为DQ092356;对照组只检出3316(G→A)突变1例(0.5%)。两组间仅3394(T→C)突变率差异显著(P<0.05)。以上8个突变位点的测序、反向斑点杂交和基因芯片检测结果完全一致。3606(A→G)为Leu的无意义突变,3618(T→C)为Phe的无意义突变,3688(G→C)为有意义突变,Ala→Pro,导致ND1蛋白的二级结构发生改变。结论:线粒体DNAND1基因3316(G→A)突变伴随3688(G→C)突变,3394(T→C)突变可能与2型糖尿病发病有关。
AIM: To explore the relationship between various mitochondrial (mt) DNA tRNA Leu (UUR) and NDI gene mutations and type 2 diabetes mellitus (T2DM) among Chinese in Hubei Province. METHODS: PCR restriction fragment length polymorphism (PCR- RFLP) analysis was used to screen point mutations of mtDNA (3 243, 3 256, 3 290, 3 316, 3 394, 3 421, 3 426, 3 460, 3 593) in 174 T2DM and 207 healthy controls. Then, DNA sequencing, reverse dot blot hybridization and Genchip were used to compare and confim mutations. All mutations were analyzed by DNASTAR and Antherprot softwares. RESULTS: In diabetic group, there were 5 carriers (2.9%) of 3 316 G→A (Ala→Thr) mutation, 4 (2.3%) of 3 394 T→C (Tyr→His) mutation, 1 (0.6%) of 3 593 T→C(Val→Ala) mutation, and 1 (0.6%) of 3 618 T→C(Phe→Phe) mutation. Among 3 316 (G→A) mutations , there were more than 1 point mutations in 2 cases, one accompanied with 3 256 C→T(Arg→Arg) and 3688 G→C (Ala→Pro) mutations, another accompanied with 3 606 A→G(Leu→Leu) mutation. 3 606 (A→G), 3 618 (T→C) and 3 688 (G→C) were novel mutations, GenBank accession number is DQ092356. In controls, only 3 316 (G→A) mutation was found in 1 subject (0.5%). There was significant difference between two groups for 3 394 (T→C) mutation frequencies (P 〈 0.05). CONCLUSION: mtDNh ND1 gene mutations at np 3 316 and np 3 688, np 3 394 might contribute to the pathngenesis of T2DM with other genetic and environmental factors.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2006年第3期586-591,共6页
Chinese Journal of Pathophysiology
基金
武汉市攻关课题资助项目(No.20016009107)
关键词
DNA
线粒体
突变
糖尿病
非胰岛素依赖型
DNA, mitochondrial
Mutation
Diabetes mellitus, non - insulin - dependent