Background Mutations in the cardiac sodium channel gene (SCN5A) may lead to a broad spectrum of familial arrhythmias, including long QT syndrome (LQTS), idiopathic ventricular fibrillation (IVF), and isolated cardiac...Background Mutations in the cardiac sodium channel gene (SCN5A) may lead to a broad spectrum of familial arrhythmias, including long QT syndrome (LQTS), idiopathic ventricular fibrillation (IVF), and isolated cardiac conduction diseases Recent studies have shown that polymorphisms in the SCN5A gene also play an important role in the manifestation of disorders involving cardiac excitability In this study, we investigated the polymorphisms of the SCN5A gene in Han Chinese and its relation to Brugada syndrome (BS) Methods Genomic DNA was isolated from 120 unrelated healthy volunteers and 48 unrelated Brugada syndrome patients by means of standard procedures All exons including the putative splicing sites of the SCN5A gene were amplified by PCR and sequenced directly or after subcloning using an ABI Prism 377 DNA sequencer Results A total of 5 single nucleotide polymorphisms (SNPs) were identified in the Han Chinese population, including 3 novel ones: G87A(A29A), 4245+82A>G, and G6174A The allele frequencies of each SNP in the Han Chinese population were as follows: G87A (A29A) 27 5%, A1673G (H558R) 10 4%, 4245+82A>G 32 8%, C5457T (D1819D) 41 3%, and G6174A 44 9% S1102Y and 10 other SNPs identified in other ethnic populations were not detected in this study There was no significant difference in the allele frequency of A1673G (H558R) between different ethnic populations (all P >0 5) On the other hand, the allele frequency of C5457T (D1819D) among Han Chinese was similar to its frequency among Japanese ( P >0 5), but higher than that among Americans ( P <0 005) The allele G1673 (R558) was over-represented in BS patients compared to controls ( P <0 005), but there was no significant difference in genotype frequencies at this locus There were also no differences in either the allele or genotype frequencies of the 4 other identified SNPs when comparing BS patients with healthy controls Conclusions The distribution of SCN5A SNPs may vary between different ethnicities The polymorphism of A1673G might be associated with BS and may contribute to a susceptibility to BS in Han Chinese展开更多
BACKGROUND Major depressive disorder(MDD)is a substantial global health concern,and its treatment is complicated by the variability in individual response to antide-pressants.AIM To consolidate research and clarify th...BACKGROUND Major depressive disorder(MDD)is a substantial global health concern,and its treatment is complicated by the variability in individual response to antide-pressants.AIM To consolidate research and clarify the impact of genetic variation on MDD treatment outcomes.METHODS Adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines,a systematic search across PubMed,EMBASE,Web of Science,and the Cochrane Library was conducted without date restrictions,utilizing key terms related to MDD,serotonin 1A receptor polymorphism(5-HTR1A),C-1019G polymorphism,and antidepressant response.Studies meeting inclusion criteria were thoroughly screened,and quality assessed using the Newcastle-Ottawa Scale.Statistical analyses,includingχ2 and I²values,were used to evaluate heterogeneity and fixed-effect or random-effect models were applied accordingly.RESULTS The initial search yielded 1216 articles,with 11 studies meeting criteria for inclusion.Analysis of various genetic models showed no significant association between the 5-HTR1A C-1019G polymorphism and antidepressant efficacy.The heterogeneity was low to moderate,and no publication bias was detected through funnel plot symmetry and Egger's and Begg's tests.CONCLUSION This meta-analysis does not support a significant association between the 5-HTR1A C-1019G polymorphism and the efficacy of antidepressant treatment in MDD.The findings call for further research with larger cohorts to substantiate these results and enhance the understanding of antidepressant pharmacogenetics.展开更多
目的:探讨RAS相关区域家族5A(Ras-association domain family 5A,RASSF5A)基因在淋巴瘤患者及正常人外周血中DNA甲基化和mRNA表达状态,并研究其与患者临床表现的关系。方法:应用甲基化特异性PCR(methylation-specific PCR,MSP)及RT-PCR...目的:探讨RAS相关区域家族5A(Ras-association domain family 5A,RASSF5A)基因在淋巴瘤患者及正常人外周血中DNA甲基化和mRNA表达状态,并研究其与患者临床表现的关系。方法:应用甲基化特异性PCR(methylation-specific PCR,MSP)及RT-PCR方法检测河北医科大学第四附属医院2013年10月至2015年3月收治的弥漫性大B细胞淋巴瘤患者74例、T细胞淋巴瘤患者42例及健康志愿者42人的外周血中RASSF5A基因甲基化及mRNA表达状态。分析其与临床表现之间的关系。结果:RASSF5A在弥漫性大B细胞淋巴瘤和T细胞淋巴瘤中的甲基化率分别为64.9%(48/74)和73.8%(31/42),明显高于正常人的7.1%(3/42)(P<0.05);而其mRNA表达量分别为0.54±0.17和0.52±0.18,均低于正常人的0.86±0.10(P<0.05)。弥漫性大B细胞淋巴瘤中RASSF5A基因启动子甲基化阳性的mRNA相对表达量(0.51±0.18)低于甲基化阴性的mRNA表达量(0.60±0.17)(P<0.05)。T细胞淋巴瘤中RASSF5A基因启动子甲基化阳性的mRNA相对表达量(0.50±0.15)低于甲基化阴性的mRNA表达量(0.63±0.12)(P<0.05)。RASSF5A基因在弥漫性大B细胞淋巴瘤中的甲基化率与患者的LDH、IPI评分及Ki67相关(P<0.05);RASSF5A基因在T细胞淋巴瘤中的甲基化率与患者的临床分期、结外累及及Ki-67相关(P<0.05)。RASSF5A基因在弥漫性大B细胞淋巴瘤中mRNA的表达量与患者的IPI评分及结外累及相关(P<0.05);RASSF5A基因在T细胞淋巴瘤中mRNA的表达量与患者的临床分期和结外累及相关(P<0.05)。结论:RASSF5A基因启动子甲基化可能是弥漫性大B细胞淋巴瘤和T细胞淋巴瘤发生的机制之一,mRNA表达沉默可能是表观遗传学机制之一。RASSF5A基因在弥漫性大B细胞淋巴瘤和T细胞淋巴瘤中主要可能起抑癌基因的作用,与淋巴瘤的侵袭性、恶性进程及预后有关。展开更多
文摘Background Mutations in the cardiac sodium channel gene (SCN5A) may lead to a broad spectrum of familial arrhythmias, including long QT syndrome (LQTS), idiopathic ventricular fibrillation (IVF), and isolated cardiac conduction diseases Recent studies have shown that polymorphisms in the SCN5A gene also play an important role in the manifestation of disorders involving cardiac excitability In this study, we investigated the polymorphisms of the SCN5A gene in Han Chinese and its relation to Brugada syndrome (BS) Methods Genomic DNA was isolated from 120 unrelated healthy volunteers and 48 unrelated Brugada syndrome patients by means of standard procedures All exons including the putative splicing sites of the SCN5A gene were amplified by PCR and sequenced directly or after subcloning using an ABI Prism 377 DNA sequencer Results A total of 5 single nucleotide polymorphisms (SNPs) were identified in the Han Chinese population, including 3 novel ones: G87A(A29A), 4245+82A>G, and G6174A The allele frequencies of each SNP in the Han Chinese population were as follows: G87A (A29A) 27 5%, A1673G (H558R) 10 4%, 4245+82A>G 32 8%, C5457T (D1819D) 41 3%, and G6174A 44 9% S1102Y and 10 other SNPs identified in other ethnic populations were not detected in this study There was no significant difference in the allele frequency of A1673G (H558R) between different ethnic populations (all P >0 5) On the other hand, the allele frequency of C5457T (D1819D) among Han Chinese was similar to its frequency among Japanese ( P >0 5), but higher than that among Americans ( P <0 005) The allele G1673 (R558) was over-represented in BS patients compared to controls ( P <0 005), but there was no significant difference in genotype frequencies at this locus There were also no differences in either the allele or genotype frequencies of the 4 other identified SNPs when comparing BS patients with healthy controls Conclusions The distribution of SCN5A SNPs may vary between different ethnicities The polymorphism of A1673G might be associated with BS and may contribute to a susceptibility to BS in Han Chinese
文摘BACKGROUND Major depressive disorder(MDD)is a substantial global health concern,and its treatment is complicated by the variability in individual response to antide-pressants.AIM To consolidate research and clarify the impact of genetic variation on MDD treatment outcomes.METHODS Adhering to Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines,a systematic search across PubMed,EMBASE,Web of Science,and the Cochrane Library was conducted without date restrictions,utilizing key terms related to MDD,serotonin 1A receptor polymorphism(5-HTR1A),C-1019G polymorphism,and antidepressant response.Studies meeting inclusion criteria were thoroughly screened,and quality assessed using the Newcastle-Ottawa Scale.Statistical analyses,includingχ2 and I²values,were used to evaluate heterogeneity and fixed-effect or random-effect models were applied accordingly.RESULTS The initial search yielded 1216 articles,with 11 studies meeting criteria for inclusion.Analysis of various genetic models showed no significant association between the 5-HTR1A C-1019G polymorphism and antidepressant efficacy.The heterogeneity was low to moderate,and no publication bias was detected through funnel plot symmetry and Egger's and Begg's tests.CONCLUSION This meta-analysis does not support a significant association between the 5-HTR1A C-1019G polymorphism and the efficacy of antidepressant treatment in MDD.The findings call for further research with larger cohorts to substantiate these results and enhance the understanding of antidepressant pharmacogenetics.
文摘目的:探讨RAS相关区域家族5A(Ras-association domain family 5A,RASSF5A)基因在淋巴瘤患者及正常人外周血中DNA甲基化和mRNA表达状态,并研究其与患者临床表现的关系。方法:应用甲基化特异性PCR(methylation-specific PCR,MSP)及RT-PCR方法检测河北医科大学第四附属医院2013年10月至2015年3月收治的弥漫性大B细胞淋巴瘤患者74例、T细胞淋巴瘤患者42例及健康志愿者42人的外周血中RASSF5A基因甲基化及mRNA表达状态。分析其与临床表现之间的关系。结果:RASSF5A在弥漫性大B细胞淋巴瘤和T细胞淋巴瘤中的甲基化率分别为64.9%(48/74)和73.8%(31/42),明显高于正常人的7.1%(3/42)(P<0.05);而其mRNA表达量分别为0.54±0.17和0.52±0.18,均低于正常人的0.86±0.10(P<0.05)。弥漫性大B细胞淋巴瘤中RASSF5A基因启动子甲基化阳性的mRNA相对表达量(0.51±0.18)低于甲基化阴性的mRNA表达量(0.60±0.17)(P<0.05)。T细胞淋巴瘤中RASSF5A基因启动子甲基化阳性的mRNA相对表达量(0.50±0.15)低于甲基化阴性的mRNA表达量(0.63±0.12)(P<0.05)。RASSF5A基因在弥漫性大B细胞淋巴瘤中的甲基化率与患者的LDH、IPI评分及Ki67相关(P<0.05);RASSF5A基因在T细胞淋巴瘤中的甲基化率与患者的临床分期、结外累及及Ki-67相关(P<0.05)。RASSF5A基因在弥漫性大B细胞淋巴瘤中mRNA的表达量与患者的IPI评分及结外累及相关(P<0.05);RASSF5A基因在T细胞淋巴瘤中mRNA的表达量与患者的临床分期和结外累及相关(P<0.05)。结论:RASSF5A基因启动子甲基化可能是弥漫性大B细胞淋巴瘤和T细胞淋巴瘤发生的机制之一,mRNA表达沉默可能是表观遗传学机制之一。RASSF5A基因在弥漫性大B细胞淋巴瘤和T细胞淋巴瘤中主要可能起抑癌基因的作用,与淋巴瘤的侵袭性、恶性进程及预后有关。
