目的报道1例中国人葡萄糖激酶(glucokinase,GCK)新发基因突变导致青少年起病的成人型糖尿病2型(maturity-onset diabetes of the young,type 2,MODY2)家系,分析其遗传学特征及临床特点。方法对1例MODY2家系行基因测序、临床资料采集及...目的报道1例中国人葡萄糖激酶(glucokinase,GCK)新发基因突变导致青少年起病的成人型糖尿病2型(maturity-onset diabetes of the young,type 2,MODY2)家系,分析其遗传学特征及临床特点。方法对1例MODY2家系行基因测序、临床资料采集及分析。结果调查此家系成员共18人,其中先证者及其弟、父亲、叔父、堂弟等父系成员11人罹患糖尿病;先证者及其弟、父亲、叔父均存在GCK基因杂合同义突变(exon1:c.45G>A:p.K15K),生物信息学功能预测提示该突变可能影响mRNA剪接而致GCK功能受损,国内研究人群尚未见此突变报道;先证者及其弟糖化血红蛋白分别为6.49%、6.72%,空腹血糖分别为6.80、7.01 mmol/L,糖尿病自身抗体谱均为阴性,6~18个月随访示血糖水平保持稳定。结论此MODY2家系中GCK基因杂合同义突变(exon1:c.45G>A:p.K15K)为中国人新发突变位点,其临床表现为轻度、持续稳定的空腹高血糖及糖化血红蛋白升高,不应低估GCK基因同义突变的致病性。展开更多
目的·筛查青少年的成人起病型糖尿病(maturity-onset diabetes of the young,MODY)家系中NEUROD1基因突变,分析突变与中国人MODY6发病的相关性及其潜在的致病机制。方法·采用PCR-直接测序法对96例GCK/MODY2、HNF1A/MODY3、HNF...目的·筛查青少年的成人起病型糖尿病(maturity-onset diabetes of the young,MODY)家系中NEUROD1基因突变,分析突变与中国人MODY6发病的相关性及其潜在的致病机制。方法·采用PCR-直接测序法对96例GCK/MODY2、HNF1A/MODY3、HNF1B/MODY5突变阴性的中国MODY先证者进行NEUROD1突变筛查,同时比较96例MODY先证者与100例非糖尿病对照者NEUROD1基因变异的基因型频率。采用从头建模法构建NEUROD1蛋白野生型和突变体的3D结构,采用双荧光素酶报告基因系统检测野生型和突变体蛋白对胰岛素基因转录活性的影响。结果·在一个MODY家系中发现NEUROD1基因杂合错义突变Glu59Gln (NM_002500.5,c.175G>C)。3D结构分析发现,该突变将野生型中带负电荷的Glu59转化为突变中不带电荷的Gln59,导致两个盐桥键Glu59-Arg54和Glu59-Lys88缺失,并形成一个新的氢键Gln59-Arg54。与野生型相比,Glu59Gln突变体的胰岛素基因转录活性下降36.3%(P<0.05)。与非糖尿病对照相比,96例MODY先证者中Ala45Thr (G-A)变异的AA+GA基因型频率显著升高(P=0.002)。结论·Glu59Gln突变改变了NEUROD1蛋白N端的分子构象,导致其胰岛素基因转录活性显著下降,是该家系突变携带者胰岛素分泌缺陷的原因。Ala45Thr变异与MODY6先证者糖尿病发病年龄的提前有关。展开更多
Non insulin dependent diabetes mellitus (NIDDM) as a most common form of diabetes is a major public health problem;there is a subgroup of NIDDM patients who develop the disease at an early age and show a dominant mode...Non insulin dependent diabetes mellitus (NIDDM) as a most common form of diabetes is a major public health problem;there is a subgroup of NIDDM patients who develop the disease at an early age and show a dominant mode of inheritance. This type is nominates Maturity onset diabetes of the young (MODY). The prevalence of MODY is difficult to access, and patients with MODY genes mutations are often identified during routine screening for other purposes. MODY2 was linked to glucokinase gene (GCK) mutations, and accounted for 8% to 56% of MODY, with the highest prevalence found in the southern Europe. The aim of this study was to examine the prevalence and nature of mutations in GCK gene in Iranian paients. We have screened GCK mutations by polymerase chain reaction (PCR);single stranded conformation polymorphism (SSCP) technique in 12 Iranian families with clinical diagnosis of MODY, included 30 patients (8 males and 22 females) and their 21 family members. PCR products with abnormal mobility in denaturing gradient gel electrophoresis (DGGE) were directly sequenced. We identified 6 novel mutations in GCK gene in Iranian families (corresponding to 36.6% prevalence). Our findings and the last study on MODY1 highlight that in addition to GCK, other MODY genes such as MODY3 and MODYX may play a significant role in diabetes characterized by monogenic autosomal dominant transmission. There is an important point that the genetic recognation can be used to pre-symptomatically identify family members at risk for developing MODY.展开更多
文摘目的报道1例中国人葡萄糖激酶(glucokinase,GCK)新发基因突变导致青少年起病的成人型糖尿病2型(maturity-onset diabetes of the young,type 2,MODY2)家系,分析其遗传学特征及临床特点。方法对1例MODY2家系行基因测序、临床资料采集及分析。结果调查此家系成员共18人,其中先证者及其弟、父亲、叔父、堂弟等父系成员11人罹患糖尿病;先证者及其弟、父亲、叔父均存在GCK基因杂合同义突变(exon1:c.45G>A:p.K15K),生物信息学功能预测提示该突变可能影响mRNA剪接而致GCK功能受损,国内研究人群尚未见此突变报道;先证者及其弟糖化血红蛋白分别为6.49%、6.72%,空腹血糖分别为6.80、7.01 mmol/L,糖尿病自身抗体谱均为阴性,6~18个月随访示血糖水平保持稳定。结论此MODY2家系中GCK基因杂合同义突变(exon1:c.45G>A:p.K15K)为中国人新发突变位点,其临床表现为轻度、持续稳定的空腹高血糖及糖化血红蛋白升高,不应低估GCK基因同义突变的致病性。
文摘目的·筛查青少年的成人起病型糖尿病(maturity-onset diabetes of the young,MODY)家系中NEUROD1基因突变,分析突变与中国人MODY6发病的相关性及其潜在的致病机制。方法·采用PCR-直接测序法对96例GCK/MODY2、HNF1A/MODY3、HNF1B/MODY5突变阴性的中国MODY先证者进行NEUROD1突变筛查,同时比较96例MODY先证者与100例非糖尿病对照者NEUROD1基因变异的基因型频率。采用从头建模法构建NEUROD1蛋白野生型和突变体的3D结构,采用双荧光素酶报告基因系统检测野生型和突变体蛋白对胰岛素基因转录活性的影响。结果·在一个MODY家系中发现NEUROD1基因杂合错义突变Glu59Gln (NM_002500.5,c.175G>C)。3D结构分析发现,该突变将野生型中带负电荷的Glu59转化为突变中不带电荷的Gln59,导致两个盐桥键Glu59-Arg54和Glu59-Lys88缺失,并形成一个新的氢键Gln59-Arg54。与野生型相比,Glu59Gln突变体的胰岛素基因转录活性下降36.3%(P<0.05)。与非糖尿病对照相比,96例MODY先证者中Ala45Thr (G-A)变异的AA+GA基因型频率显著升高(P=0.002)。结论·Glu59Gln突变改变了NEUROD1蛋白N端的分子构象,导致其胰岛素基因转录活性显著下降,是该家系突变携带者胰岛素分泌缺陷的原因。Ala45Thr变异与MODY6先证者糖尿病发病年龄的提前有关。
文摘Non insulin dependent diabetes mellitus (NIDDM) as a most common form of diabetes is a major public health problem;there is a subgroup of NIDDM patients who develop the disease at an early age and show a dominant mode of inheritance. This type is nominates Maturity onset diabetes of the young (MODY). The prevalence of MODY is difficult to access, and patients with MODY genes mutations are often identified during routine screening for other purposes. MODY2 was linked to glucokinase gene (GCK) mutations, and accounted for 8% to 56% of MODY, with the highest prevalence found in the southern Europe. The aim of this study was to examine the prevalence and nature of mutations in GCK gene in Iranian paients. We have screened GCK mutations by polymerase chain reaction (PCR);single stranded conformation polymorphism (SSCP) technique in 12 Iranian families with clinical diagnosis of MODY, included 30 patients (8 males and 22 females) and their 21 family members. PCR products with abnormal mobility in denaturing gradient gel electrophoresis (DGGE) were directly sequenced. We identified 6 novel mutations in GCK gene in Iranian families (corresponding to 36.6% prevalence). Our findings and the last study on MODY1 highlight that in addition to GCK, other MODY genes such as MODY3 and MODYX may play a significant role in diabetes characterized by monogenic autosomal dominant transmission. There is an important point that the genetic recognation can be used to pre-symptomatically identify family members at risk for developing MODY.
