目的分析KCNQ1及SLC30A8基因多态性与2型糖尿病(T2DM)患者的相关性。方法选取2015年9月~2017年9月间在本院确诊并接受治疗的T2DM患者100例作为观察组,选取同期在本院进行体检健康者100例作为对照组,收集两组对象早晨空腹静脉血5 m L,全...目的分析KCNQ1及SLC30A8基因多态性与2型糖尿病(T2DM)患者的相关性。方法选取2015年9月~2017年9月间在本院确诊并接受治疗的T2DM患者100例作为观察组,选取同期在本院进行体检健康者100例作为对照组,收集两组对象早晨空腹静脉血5 m L,全自动生化分析仪检测糖化血红蛋白、空腹血糖水平、胰岛素和血脂的水平,基因型检测使用单碱基延伸法,分析不同基因位点和T2DM相关性状况。结果 SLC30A8基因对照组TT、CT及CC基因型的频率依次为16%、52%及32%,观察组依次为13%、49%、38%,差异无统计学意义(χ~2=1.290,P>0.05);对照组T、C等位的基因频率依次为61%、39%,观察组依次为73%、27%,差异有统计学意义(95%CI=0.795~1.684,OR=1.205,χ~2=11.553,P<0.05)。观察组TT基因型血清FINS及HOMA-B高于CT基因型和CC基因型,观察组TT基因型血清TC、TG和FPG低于CT基因型和CC基因型,差异均有统计学意义(P<0.05);KCNQ1基因对照组TT、CT及CC基因型的频率依次为27%、41%及32%,观察组依次为24%、45%、31%,差异无统计学意义(χ~2=2.006,P>0.05);对照组T、C等位的基因频率依次为53%、47%,观察组依次为64%、36%,差异有统计学意义(95%CI=0.863-2.104,OR=1.171,χ~2=12.995,P<0.05),CC基因型血清TC、TG、FPG及Hb A1c低于CT、TT基因型,血清FINS高于CT、TT基因型,差异均有统计学意义(P<0.05)。结论 SLC30A8基因多态性rs13266634位点和KCNQ1基因多态性rs2237892位点和T2DM发病及血管并发症有一定相关性。展开更多
Objective To determine mutations of two common potassium channel subunit genes KCNQ1, KCNH2 causing long QT syndrome (LQTS) in the Chinese.Methods Thirty-one Chinese LQTS pedigrees were characterized for mutations in ...Objective To determine mutations of two common potassium channel subunit genes KCNQ1, KCNH2 causing long QT syndrome (LQTS) in the Chinese.Methods Thirty-one Chinese LQTS pedigrees were characterized for mutations in the two LQTS genes, KCNQ1 and KCNH2, by sequencing.Results Two novel KCNQ1 mutations, S277L in the S5 domain and G306V in the channel pore, and two novel KCNH2 mutations, L413P in the transmembrane domain S1 and L559H in the transmembrane domain S5 were identified. The triggering factors for cardiac events developed in these mutation carriers included physical exercise and excitation. Mutation L413P in KCNH2 was associated with the notched T wave on ECGs. Mutation L559H in KCNH2 was associated with the typical bifid T wave on ECGs. Mutation S277L in KCNQ1 was associated with a high-amplitude T wave and G306V was associated with a low-amplitude T wave. Two likely polymorphisms, IVS11 +18C >T in KCNQ1 and L520V in KCNH2 were also identified in two LQTS patients.Conclusions The mutation rates for both KCNQ1 (6.4%) and KCNH2 (6.4%) are lower in the Chinese population than those from North America or Europe.展开更多
文摘目的探讨KCNQ1基因单核苷酸多态性(SNP)位点rs2237892、rs2237895及rs2237896与妊娠期糖尿病(GDM)的相关性。方法本研究共纳入1436例孕妇,其中GDM 520例,糖耐量正常(NGT) 641例以及50 g葡萄糖激发试验阴性[GCT(-)]275例,后两组设为对照。采用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)的方法检测KCNQ1基因的多态性。并以稳态模型评估指数(HOMA)评估其胰岛β细胞功能及胰岛素抵抗。结果(1)SNP rs2237896的三种基因型(AA、AG、GG)在GDM组及对照组分布频率分别为8.8%、46.7%、44.4%和13.1%、47.5%、39.4%,两组的基因型分布频率差异显著(P=0.011)。该位点在其隐性模型中(AA vs AG+GG),两组差异仍显著(P=0.016)。rs2237896等位基因A、G的分布频率在GDM组和对照组分别为32.2%、67.8%和36.8%、63.2%,GDM组中G等位基因分布频率高于对照组,差异有显著性[P=0.012,OR 1.228(95%CI 1.045～1.442)]。(2) SNP rs2237895的三种基因型(AA、AC、CC)在GDM组及对照组分布频率分别为39%、53.3%、7.7%和48.1%、43.0%、8.8%,两组的基因型分布频率差异显著(P=0.022)。该位点在其显性模型中(CC+AC vs AA),两组差异仍显著(P=0.001)。其等位基因A、C的分布频率在GDM组和对照组分别为65.7%、34.3%和69.7%、30.3%,GDM组中C等位基因分布频率高于对照组,差异有显著性[P=0.028,OR 1.200(1.020～1.411)]。(3)将受试者按SNP rs2237895基因型AA、AC、CC分类,其HOMA-B值分别为(158.15±99.66)、(141.72±132.62)和(131.54±189.85),差异具有显著性(P=0.021),基因型CC的孕妇具有最小的HOMA-B值。同时,该位点在显性模型中,差异也有显著性(P=0.005)[HOMA-B值为(140.25±142.15)(AC+CC)vs(158.15±99.66)(AA)]。结论在中国人群中KCNQ1基因SNP与GDM具有一定相关性,可能与具有风险基因的个体其胰岛β细胞功能更易受到损伤有关。
基金grants obtained from the National Natural Science Foundation of China （No.： 81170177, 81030002） and science and Technology De- partment of Gansu Province Project （145RJZ104）.
基金This study was supported by grants from the National Natural Science Foundation of China (No.30170381) the American Heart Association Ohio-Affiliate (No. AHA 0051205B).
文摘Objective To determine mutations of two common potassium channel subunit genes KCNQ1, KCNH2 causing long QT syndrome (LQTS) in the Chinese.Methods Thirty-one Chinese LQTS pedigrees were characterized for mutations in the two LQTS genes, KCNQ1 and KCNH2, by sequencing.Results Two novel KCNQ1 mutations, S277L in the S5 domain and G306V in the channel pore, and two novel KCNH2 mutations, L413P in the transmembrane domain S1 and L559H in the transmembrane domain S5 were identified. The triggering factors for cardiac events developed in these mutation carriers included physical exercise and excitation. Mutation L413P in KCNH2 was associated with the notched T wave on ECGs. Mutation L559H in KCNH2 was associated with the typical bifid T wave on ECGs. Mutation S277L in KCNQ1 was associated with a high-amplitude T wave and G306V was associated with a low-amplitude T wave. Two likely polymorphisms, IVS11 +18C >T in KCNQ1 and L520V in KCNH2 were also identified in two LQTS patients.Conclusions The mutation rates for both KCNQ1 (6.4%) and KCNH2 (6.4%) are lower in the Chinese population than those from North America or Europe.
