Nicotinic acetylcholine receptors (nAChRs) play a significant role in excitatory synaptic transmission in insects and are the target for chloronicotinyl and nereistoxin insecticides.In recent years,Chilo suppressalis,...Nicotinic acetylcholine receptors (nAChRs) play a significant role in excitatory synaptic transmission in insects and are the target for chloronicotinyl and nereistoxin insecticides.In recent years,Chilo suppressalis,an economically important pest of rice,developed high resistance against monosultap,a nereistoxin insecticide acting on nAChR.In order to reveal the hypothesized target insensitive mechanism,studies on the molecular property of nAChR from Chilo suppressalis are required.In this study,the full length cDNA of nAChR α subunit from this pest was cloned by RT-PCR.Sequence analysis shows that it is a novel nAChR α subunit,which was named as Cs α 1(Genbank accession No.AF418987).It contains 1?997?bp nucleotides and involves an open reading frame (ORF) encoding a mature protein of 509 amino acids excluding a signal peptide of 24 amino acids.The deduced amino acid sequence was 52%-94% identical to the reported insect nAChR genes.展开更多
Background：Congenital myasthenic syndromes are a group orrare disorders that are clinically and genetically heterogeneous and caused by mutations in the genes encoding proteins of the neuromuscular junction.Here,we d...Background：Congenital myasthenic syndromes are a group orrare disorders that are clinically and genetically heterogeneous and caused by mutations in the genes encoding proteins of the neuromuscular junction.Here,we described a Chinese family that presented with phenotypes of classic slow-channel congenital myasthenic syndrome （SCCMS）.Methods：Clinical characteristics and electrophysiological features of three patients from a Chinese family were examined,and next-generation sequencing followed by direct sequencing was carried out.Results：The patients revealed variability in clinical and electrophysiological features.However,weakness,scoliosis,and repetitive-compound muscle action potential were found in all affected members in the family.A heterozygous C〉T missense mutation at nucleotide 865 in acetylcholine receptor epsilon-subunit （CHRNE） gene that causes a leucine-to-phenylalanine substitution at position 289 （L289F） was found.Conclusions：We reported a SCCMS family of Chinese origin.In the family,classical clinical phenotype with phenotypic variability among different members was found.Genetic testing could help diagnose this rare disease.展开更多
Background it has been reported that the nicotinic acetylcholine receptor subunit a4 gene （CHRNA4） might be associated with smoking behaviors in the previous studies. Up to now, there are few reports on the relation...Background it has been reported that the nicotinic acetylcholine receptor subunit a4 gene （CHRNA4） might be associated with smoking behaviors in the previous studies. Up to now, there are few reports on the relationship between CHRNA4 and smoking initiation, in this study, we tried to explore the role of two polymorphisms in CHRNA4 （rs1044396 and rs1044397） in smoking initiation and nicotine dependence in Chinese male smokers. Methods Nine hundred and sixty-six Chinese male lifetime nonsmokers and smokers were assessed by the Fagerstr6m test for nicotine dependence （FTND）, smoking quantity （SQ） and the heaviness of smoking index （HSI）.展开更多
目的:探讨散发性阿尔茨海默病(Spord ic alzhe im er d isease,SAD)患者神经型尼古丁受体α7亚单位(CHRNA7)基因多态性情况。方法:用聚合酶链式反应-温度梯度凝胶电泳(PCR-TGGE)和DNA测序技术,分析12例SAD病人CHRNA7基因全部10个外显子...目的:探讨散发性阿尔茨海默病(Spord ic alzhe im er d isease,SAD)患者神经型尼古丁受体α7亚单位(CHRNA7)基因多态性情况。方法:用聚合酶链式反应-温度梯度凝胶电泳(PCR-TGGE)和DNA测序技术,分析12例SAD病人CHRNA7基因全部10个外显子及其两侧的部分内含子基因序列。结果:在CHRNA7基因上发现1个新的突变位点,即在外显子7附近的内含子7上的117 643+GTG三碱基插入突变,未发现任何已报道的多态性位点。结论:SAD患者的CHRNA7基因多态性与其它人群可能有差异。展开更多
目的探讨β2-烟碱型乙酰胆碱受体(β2-n ACh R)在海马CA1和CA3锥体神经元的A型γ-氨基丁酸受体(GABA_A-R)发育中的作用。方法应用β2-n ACh R基因敲除小鼠(β2-KO组)制备急性分离的海马CA1和CA3锥体神经元,应用穿孔膜片钳记录技术记录GA...目的探讨β2-烟碱型乙酰胆碱受体(β2-n ACh R)在海马CA1和CA3锥体神经元的A型γ-氨基丁酸受体(GABA_A-R)发育中的作用。方法应用β2-n ACh R基因敲除小鼠(β2-KO组)制备急性分离的海马CA1和CA3锥体神经元,应用穿孔膜片钳记录技术记录GABA_A-R选择性激动剂蝇蕈醇在CA1和CA3锥体神经元诱导的GABA电流,测试其平衡电位(E_(Mus))和动力学指标,并与野生型小鼠(WT组)进行比较。结果β2-KO组小鼠(n=4)CA1锥体神经元(n=7)的E_(Mus)为-31.7±3.5 m V,与WT组相比向去极化偏移(P<0.05);CA3锥体神经元(n=4)的E_(Mus)为-16.1±4.6 m V,同样较WT组偏向去极化方向(P<0.01);与WT组小鼠不同,β2-KO组小鼠CA3和CA1神经元的E_(Mus)差异有统计学意义(P<0.05)。β2-KO组小鼠CA1和CA3神经元上都显示GABA_A-R的失敏显著减慢,衰减时间分别为2.2±0.2 s、3.2±0.1 s(WT组为1.6±0.1 s、2.3±0.1 s,P<0.05或P<0.01)。结论含β2的n ACh R可能参与促进小鼠海马CA1和CA3锥体细胞中GABA_A-R的功能成熟。展开更多
文摘Nicotinic acetylcholine receptors (nAChRs) play a significant role in excitatory synaptic transmission in insects and are the target for chloronicotinyl and nereistoxin insecticides.In recent years,Chilo suppressalis,an economically important pest of rice,developed high resistance against monosultap,a nereistoxin insecticide acting on nAChR.In order to reveal the hypothesized target insensitive mechanism,studies on the molecular property of nAChR from Chilo suppressalis are required.In this study,the full length cDNA of nAChR α subunit from this pest was cloned by RT-PCR.Sequence analysis shows that it is a novel nAChR α subunit,which was named as Cs α 1(Genbank accession No.AF418987).It contains 1?997?bp nucleotides and involves an open reading frame (ORF) encoding a mature protein of 509 amino acids excluding a signal peptide of 24 amino acids.The deduced amino acid sequence was 52%-94% identical to the reported insect nAChR genes.
文摘Background：Congenital myasthenic syndromes are a group orrare disorders that are clinically and genetically heterogeneous and caused by mutations in the genes encoding proteins of the neuromuscular junction.Here,we described a Chinese family that presented with phenotypes of classic slow-channel congenital myasthenic syndrome （SCCMS）.Methods：Clinical characteristics and electrophysiological features of three patients from a Chinese family were examined,and next-generation sequencing followed by direct sequencing was carried out.Results：The patients revealed variability in clinical and electrophysiological features.However,weakness,scoliosis,and repetitive-compound muscle action potential were found in all affected members in the family.A heterozygous C〉T missense mutation at nucleotide 865 in acetylcholine receptor epsilon-subunit （CHRNE） gene that causes a leucine-to-phenylalanine substitution at position 289 （L289F） was found.Conclusions：We reported a SCCMS family of Chinese origin.In the family,classical clinical phenotype with phenotypic variability among different members was found.Genetic testing could help diagnose this rare disease.
基金This study was supported by grants from National Natural Science Foundation of China （No. 30600205） and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China （No. 2008890-19-18）.
文摘Background it has been reported that the nicotinic acetylcholine receptor subunit a4 gene （CHRNA4） might be associated with smoking behaviors in the previous studies. Up to now, there are few reports on the relationship between CHRNA4 and smoking initiation, in this study, we tried to explore the role of two polymorphisms in CHRNA4 （rs1044396 and rs1044397） in smoking initiation and nicotine dependence in Chinese male smokers. Methods Nine hundred and sixty-six Chinese male lifetime nonsmokers and smokers were assessed by the Fagerstr6m test for nicotine dependence （FTND）, smoking quantity （SQ） and the heaviness of smoking index （HSI）.
文摘目的:探讨散发性阿尔茨海默病(Spord ic alzhe im er d isease,SAD)患者神经型尼古丁受体α7亚单位(CHRNA7)基因多态性情况。方法:用聚合酶链式反应-温度梯度凝胶电泳(PCR-TGGE)和DNA测序技术,分析12例SAD病人CHRNA7基因全部10个外显子及其两侧的部分内含子基因序列。结果:在CHRNA7基因上发现1个新的突变位点,即在外显子7附近的内含子7上的117 643+GTG三碱基插入突变,未发现任何已报道的多态性位点。结论:SAD患者的CHRNA7基因多态性与其它人群可能有差异。
文摘目的探讨β2-烟碱型乙酰胆碱受体(β2-n ACh R)在海马CA1和CA3锥体神经元的A型γ-氨基丁酸受体(GABA_A-R)发育中的作用。方法应用β2-n ACh R基因敲除小鼠(β2-KO组)制备急性分离的海马CA1和CA3锥体神经元,应用穿孔膜片钳记录技术记录GABA_A-R选择性激动剂蝇蕈醇在CA1和CA3锥体神经元诱导的GABA电流,测试其平衡电位(E_(Mus))和动力学指标,并与野生型小鼠(WT组)进行比较。结果β2-KO组小鼠(n=4)CA1锥体神经元(n=7)的E_(Mus)为-31.7±3.5 m V,与WT组相比向去极化偏移(P<0.05);CA3锥体神经元(n=4)的E_(Mus)为-16.1±4.6 m V,同样较WT组偏向去极化方向(P<0.01);与WT组小鼠不同,β2-KO组小鼠CA3和CA1神经元的E_(Mus)差异有统计学意义(P<0.05)。β2-KO组小鼠CA1和CA3神经元上都显示GABA_A-R的失敏显著减慢,衰减时间分别为2.2±0.2 s、3.2±0.1 s(WT组为1.6±0.1 s、2.3±0.1 s,P<0.05或P<0.01)。结论含β2的n ACh R可能参与促进小鼠海马CA1和CA3锥体细胞中GABA_A-R的功能成熟。
