目的:研究RNA结合基序单链相互作用蛋白3(RNA-binding motif,single-stranded-interacting protein 3,RBMS3)对胃癌细胞侵袭的影响,并探讨其可能的分子作用机制。方法:首先采用实时荧光定量PCR和蛋白质印迹法检测人正常胃黏膜上皮细胞GE...目的:研究RNA结合基序单链相互作用蛋白3(RNA-binding motif,single-stranded-interacting protein 3,RBMS3)对胃癌细胞侵袭的影响,并探讨其可能的分子作用机制。方法:首先采用实时荧光定量PCR和蛋白质印迹法检测人正常胃黏膜上皮细胞GES-1以及胃癌细胞MKN-28、MKN-45、NCI-N87和SGC-7901中RBMS3的表达水平。然后采用脂质体转染法将RBMS3过表达载体[RBMS3-pcDNA3.1(+)]转染至胃癌MKN-45和SGC-7901细胞中,同时设置空白对照组和空载体转染的阴性对照组。采用实时荧光定量PCR和蛋白质印迹法验证RBMS3过表达效果后,Transwell小室法检测细胞侵袭能力的变化,实时荧光定量PCR和蛋白质印迹法检测细胞中上皮-间质转化相关蛋白以及Wnt信号通路中β-连环蛋白(β-catenin)的表达水平变化。最后,用Wnt通路激动剂氯化锂(lithium chloride,LiCl)处理RBMS3过表达的胃癌MKN-45和SGC-7901细胞后,再次采用Transwell小室法检测细胞侵袭能力的变化。结果:与正常胃黏膜细胞相比,4种胃癌细胞中RBMS3 mRNA和蛋白的表达水平均明显降低(P值均<0.05)。RBMS3过表达质粒转染后,胃癌MKN-45和SGC-7901细胞中RBMS 3基因过表达,2种细胞的侵袭能力随之明显降低(P值均<0.05)。在RBMS3过表达的胃癌MKN-45和SGC-7901细胞中,N-钙黏蛋白(N-cadherin)和β-catenin表达水平均明显降低(P值均<0.05),而E-钙黏蛋白(E-cadherin)表达水平明显升高(P值均<0.05)。用LiCl处理RBMS3过表达的MKN-45和SGC-7901细胞后,RBMS3对2种细胞侵袭的抑制作用均被部分抵消(P值均<0.05)。结论:RBMS3可能通过阻滞Wnt/β-catenin信号通路,抑制人胃癌细胞的侵袭和上皮-间质转化。展开更多
The RNA‐binding glycine‐rich protein(RB‐GRP)family is characterized by the presence of a glycine‐rich domain arranged in(Gly)n‐X repeats and an RNA‐recognition motif(RRM). RB‐GRPs participate in varied ph...The RNA‐binding glycine‐rich protein(RB‐GRP)family is characterized by the presence of a glycine‐rich domain arranged in(Gly)n‐X repeats and an RNA‐recognition motif(RRM). RB‐GRPs participate in varied physiological and biochemical processes especially in the stress response of plants. In this study, a total of 23 RB‐GRPs distributed on 10 chromosomes were identified in maize(Zea mays L.), and they were divided into four subgroups according to their conserved domain architecture. Five pairs of paralogs were identified,while none of them was located on the same chromosomal region, suggesting that segmental duplication is predominant in the duplication events of the RB‐GRPs in maize. Comparative analysis of RB‐GRPs in maize, Arabidopsis(Arabidopsis thaliana L.), rice(Oryza sativa L.), and wheat(Triticum aestivum)revealed that two exclusive subgroups were only identified in maize. Expression of eight ZmRB‐GRPs was significantly regulated by at least two kinds of stresses. In addition, cis‐elements predicted in the promoter regions of the ZmRB‐GRPs also indicated that these ZmRB‐GRPs would be involved in stress response of maize. The preliminary genome‐wide analysis of the RB‐GRPs in maize would provide useful information for further study on the function of the ZmRB‐GRPs.展开更多
Importance:Pathogenic variants in theRBM20 gene are associated with aggressive dilated cardiomyopathy(DCM).Recently,RBM20 was found to be associated with left ventricular non-compaction cardiomyopathy(LVNC).Thus far,o...Importance:Pathogenic variants in theRBM20 gene are associated with aggressive dilated cardiomyopathy(DCM).Recently,RBM20 was found to be associated with left ventricular non-compaction cardiomyopathy(LVNC).Thus far,only five families with LVNC have been reported to carry variants inRBM20.It remains unknown whether the variants inRBM20 associated with DCM can also cause LVNC.Objective:To elucidate the causativeRBM20 variant in two unrelated patients with both LVNC and DCM,and to identify the clinical characteristics associated with variants inRBM20.Methods:Trio whole-exome sequencing(WES)was performed.Variants were filtered and classified in accordance with the guidelines of the American College of Medical Genetics and Genomics(ACMG).Results:We identified two distinctde novo variants inRBM20(one per patient)in these two patients with LVNC.Both variants have been reported in patients with DCM,without the LVNC phenotype.Patient 1 was an 11-year-old girl who had DCM,LVNC,and heart failure;the ratio of noncompacted-to-compacted myocardium was 2.7:1.Ade novo heterozygous variant c.1907G>A(p.Arg636His)in exon 9 was identified in this patient.Patient 2 was a 13-year-old boy who had clinical phenotypes identical to those of Patient 1;the ratio of noncompacted-to-compacted myocardium was 3.2:1 in this patient.WES revealed ade novo heterozygous variant c.1909A>G(p.Ser637Gly)in exon 9.Both variants were previously characterized as pathogenic,and our study classified them as pathogenic variants based on the ACMG guidelines.Interpretation:We found that two patients with LVNC had variants inRBM20.Our results extended the clinical spectrum of the twoRBM20 variants and illustrated that the same variant inRBM20 can cause DCM,with or without the LVNC phenotype.展开更多
Serine/arginine (SR)-rich proteins are critical for the regulation of alternative splicing (AS), which generates multiple mRNA isoforms from one gene and provides protein diversity for cell differentiation and tissue ...Serine/arginine (SR)-rich proteins are critical for the regulation of alternative splicing (AS), which generates multiple mRNA isoforms from one gene and provides protein diversity for cell differentiation and tissue development. Genetic evidence suggests that Drosophila genital-specific overexpression of SR-related nuclear matrix protein of 160 kDa (SRml60), an SR prot&n with a PWI RNA-binding motif, causes defective development only in male flies and results in abnonnal male genital structures and abnormal testis. However, the molecular characterization of SRm160 is limited. Using the high-throughput sequencing of RNA isolated by crosslinking immunoprecipitation (HITS-CLIP) method in two sex-specific embryonic cell lines, S2 from the male and Kc from the female, we first identified the genome-wide RNA-binding characteristics of SRm160, which preferred binding to the exonic tri-nucleotide repeats GCA and AAC. We then validated this binding through both in vitro gel-shift assay and in vivo splicing of minigenes and found that SRm160 level affects AS of many transcripts. Furthermore, we identified 492 differential binding sites (DBS) of SRm160 varying between the two sex-specific cell lines.Among these DBS-containing genes, splicing factors were highly enriched, including transformer, a key regulator in the sex determination cascade. Analyses of fly mutants demonstrated that the SRm160 level affects AS isoforms of transformer. These findings shed crucial light on SRm160's RNA-binding specificity and regulation of AS in Drosophila sex determination and development.展开更多
目的:分析肺腺癌组织中RNA结合基序蛋白38基因(RNA-binding motif protein 38,RBM38)及抑癌基因p53 m RNA和蛋白的表达情况,探讨其在肺腺癌发生发展中的意义。方法:取2012年10月至2015年6月新疆医科大学附属肿瘤医院收治的50例肺腺癌患...目的:分析肺腺癌组织中RNA结合基序蛋白38基因(RNA-binding motif protein 38,RBM38)及抑癌基因p53 m RNA和蛋白的表达情况,探讨其在肺腺癌发生发展中的意义。方法:取2012年10月至2015年6月新疆医科大学附属肿瘤医院收治的50例肺腺癌患者的肿瘤组织标本作为实验组,相对应的癌旁组织标本作为对照组。用RT-PCR法检测两组中RBM38及p53m RNA相对表达量,用Western blotting法检测两组中RBM38及p53蛋白的相对表达量。结果:实验组RBM38 m RNA及蛋白相对表达量(0.357±0.170、0.294±0.149)均高于对照组(0.271±0.128、0.206±0.099),实验组p53 m RNA及蛋白(0.457±0.208、0.671±0.200)相对表达量均高于对照组(0.308±0.167、0.332±0.071),差异均有统计学意义(均P<0.01)。RBM38表达与肺腺癌患者TNM分期、浸润深度有关(P<0.05),p53表达与患者TNM分期有关(P<0.05)。实验组RBM38与p53蛋白表达呈负相关(r=-0.626,P<0.01)。结论:肺腺癌组织RBM38、p53 m RNA及蛋白表达均高于癌旁组织,两者均与患者TNM分期等病理参数关系密切。随着RBM38蛋白表达的增加p53蛋白随之减少,RBM38可能通过抑制p53的翻译从而促进肺癌的发生发展,RBM38可能成为肺腺癌分子靶向治疗的靶点。展开更多
扩张型心肌病(DCM)是临床常见的原发性心肌病之一,是造成心脏性猝死的重要原因,至今已报道51个相关致病基因。不同基因导致的DCM亚型具有特异性临床特征与遗传异质性。其中RNA结合基序蛋白20(RNA-binding motif protein 20,RBM20)编码...扩张型心肌病(DCM)是临床常见的原发性心肌病之一,是造成心脏性猝死的重要原因,至今已报道51个相关致病基因。不同基因导致的DCM亚型具有特异性临床特征与遗传异质性。其中RNA结合基序蛋白20(RNA-binding motif protein 20,RBM20)编码心肌特异性mRNA剪接调节因子,是DCM明确致病基因之一。RBM20基因相关DCM具有遗传外显率高、发病年龄早、心脏猝死率高等严重临床表现。其独特的致病分子机制也显示出其作为心力衰竭潜在治疗靶点的可能性。本文将对RBM20相关DCM的发病机理、分子遗传学、临床特征与治疗进行进展性综述,对于DCM亚型的研究强调了基因检测在心血管精准医疗中的重要性。展开更多
基金financially supported by the National Natural Science Foundation of China (31171565 and 31371635)
文摘The RNA‐binding glycine‐rich protein(RB‐GRP)family is characterized by the presence of a glycine‐rich domain arranged in(Gly)n‐X repeats and an RNA‐recognition motif(RRM). RB‐GRPs participate in varied physiological and biochemical processes especially in the stress response of plants. In this study, a total of 23 RB‐GRPs distributed on 10 chromosomes were identified in maize(Zea mays L.), and they were divided into four subgroups according to their conserved domain architecture. Five pairs of paralogs were identified,while none of them was located on the same chromosomal region, suggesting that segmental duplication is predominant in the duplication events of the RB‐GRPs in maize. Comparative analysis of RB‐GRPs in maize, Arabidopsis(Arabidopsis thaliana L.), rice(Oryza sativa L.), and wheat(Triticum aestivum)revealed that two exclusive subgroups were only identified in maize. Expression of eight ZmRB‐GRPs was significantly regulated by at least two kinds of stresses. In addition, cis‐elements predicted in the promoter regions of the ZmRB‐GRPs also indicated that these ZmRB‐GRPs would be involved in stress response of maize. The preliminary genome‐wide analysis of the RB‐GRPs in maize would provide useful information for further study on the function of the ZmRB‐GRPs.
文摘Importance:Pathogenic variants in theRBM20 gene are associated with aggressive dilated cardiomyopathy(DCM).Recently,RBM20 was found to be associated with left ventricular non-compaction cardiomyopathy(LVNC).Thus far,only five families with LVNC have been reported to carry variants inRBM20.It remains unknown whether the variants inRBM20 associated with DCM can also cause LVNC.Objective:To elucidate the causativeRBM20 variant in two unrelated patients with both LVNC and DCM,and to identify the clinical characteristics associated with variants inRBM20.Methods:Trio whole-exome sequencing(WES)was performed.Variants were filtered and classified in accordance with the guidelines of the American College of Medical Genetics and Genomics(ACMG).Results:We identified two distinctde novo variants inRBM20(one per patient)in these two patients with LVNC.Both variants have been reported in patients with DCM,without the LVNC phenotype.Patient 1 was an 11-year-old girl who had DCM,LVNC,and heart failure;the ratio of noncompacted-to-compacted myocardium was 2.7:1.Ade novo heterozygous variant c.1907G>A(p.Arg636His)in exon 9 was identified in this patient.Patient 2 was a 13-year-old boy who had clinical phenotypes identical to those of Patient 1;the ratio of noncompacted-to-compacted myocardium was 3.2:1 in this patient.WES revealed ade novo heterozygous variant c.1909A>G(p.Ser637Gly)in exon 9.Both variants were previously characterized as pathogenic,and our study classified them as pathogenic variants based on the ACMG guidelines.Interpretation:We found that two patients with LVNC had variants inRBM20.Our results extended the clinical spectrum of the twoRBM20 variants and illustrated that the same variant inRBM20 can cause DCM,with or without the LVNC phenotype.
基金National Natural Science Foundation of China (NSFC31525022, 91440109, and 31472045)+2 种基金Chinese Academy of Sciences (KJZD-EW-L12) to Y.-Z.X.NSFC (31570821) to Y.-J.F.NSFC (31522053, 91631103) to S. Z.
文摘Serine/arginine (SR)-rich proteins are critical for the regulation of alternative splicing (AS), which generates multiple mRNA isoforms from one gene and provides protein diversity for cell differentiation and tissue development. Genetic evidence suggests that Drosophila genital-specific overexpression of SR-related nuclear matrix protein of 160 kDa (SRml60), an SR prot&n with a PWI RNA-binding motif, causes defective development only in male flies and results in abnonnal male genital structures and abnormal testis. However, the molecular characterization of SRm160 is limited. Using the high-throughput sequencing of RNA isolated by crosslinking immunoprecipitation (HITS-CLIP) method in two sex-specific embryonic cell lines, S2 from the male and Kc from the female, we first identified the genome-wide RNA-binding characteristics of SRm160, which preferred binding to the exonic tri-nucleotide repeats GCA and AAC. We then validated this binding through both in vitro gel-shift assay and in vivo splicing of minigenes and found that SRm160 level affects AS of many transcripts. Furthermore, we identified 492 differential binding sites (DBS) of SRm160 varying between the two sex-specific cell lines.Among these DBS-containing genes, splicing factors were highly enriched, including transformer, a key regulator in the sex determination cascade. Analyses of fly mutants demonstrated that the SRm160 level affects AS isoforms of transformer. These findings shed crucial light on SRm160's RNA-binding specificity and regulation of AS in Drosophila sex determination and development.
文摘目的:分析肺腺癌组织中RNA结合基序蛋白38基因(RNA-binding motif protein 38,RBM38)及抑癌基因p53 m RNA和蛋白的表达情况,探讨其在肺腺癌发生发展中的意义。方法:取2012年10月至2015年6月新疆医科大学附属肿瘤医院收治的50例肺腺癌患者的肿瘤组织标本作为实验组,相对应的癌旁组织标本作为对照组。用RT-PCR法检测两组中RBM38及p53m RNA相对表达量,用Western blotting法检测两组中RBM38及p53蛋白的相对表达量。结果:实验组RBM38 m RNA及蛋白相对表达量(0.357±0.170、0.294±0.149)均高于对照组(0.271±0.128、0.206±0.099),实验组p53 m RNA及蛋白(0.457±0.208、0.671±0.200)相对表达量均高于对照组(0.308±0.167、0.332±0.071),差异均有统计学意义(均P<0.01)。RBM38表达与肺腺癌患者TNM分期、浸润深度有关(P<0.05),p53表达与患者TNM分期有关(P<0.05)。实验组RBM38与p53蛋白表达呈负相关(r=-0.626,P<0.01)。结论:肺腺癌组织RBM38、p53 m RNA及蛋白表达均高于癌旁组织,两者均与患者TNM分期等病理参数关系密切。随着RBM38蛋白表达的增加p53蛋白随之减少,RBM38可能通过抑制p53的翻译从而促进肺癌的发生发展,RBM38可能成为肺腺癌分子靶向治疗的靶点。
文摘扩张型心肌病(DCM)是临床常见的原发性心肌病之一,是造成心脏性猝死的重要原因,至今已报道51个相关致病基因。不同基因导致的DCM亚型具有特异性临床特征与遗传异质性。其中RNA结合基序蛋白20(RNA-binding motif protein 20,RBM20)编码心肌特异性mRNA剪接调节因子,是DCM明确致病基因之一。RBM20基因相关DCM具有遗传外显率高、发病年龄早、心脏猝死率高等严重临床表现。其独特的致病分子机制也显示出其作为心力衰竭潜在治疗靶点的可能性。本文将对RBM20相关DCM的发病机理、分子遗传学、临床特征与治疗进行进展性综述,对于DCM亚型的研究强调了基因检测在心血管精准医疗中的重要性。