为探究LEPR基因多态性的遗传特性,本研究以贵州白山羊为试验材料,运用DNA池结合直接测序方法进行LEPR基因的SNPs位点的筛选,继而对LEPR基因RNA的二级结构以及其所编码蛋白质的二级结构和三级结构进行生物信息分析。结果表明,在试验群体L...为探究LEPR基因多态性的遗传特性,本研究以贵州白山羊为试验材料,运用DNA池结合直接测序方法进行LEPR基因的SNPs位点的筛选,继而对LEPR基因RNA的二级结构以及其所编码蛋白质的二级结构和三级结构进行生物信息分析。结果表明,在试验群体LEPR基因中共发现4个SNPs,分别为exon4-G246A(Asp-Asn)、exon8-C39T(同义突变)、intron8-G59A(内含子突变)和exon18-C94T(Ser-Leu)。经生物信息学软件分析表明,exon4-G246A(Asp-Asn)和exon18-C94T(Ser-Leu)位点突变前后的等位基因频率、LEPR m RNA的二级结构、LEPR蛋白质二级结构和三级结构均有改变。展开更多
The laboratory rat is a valuable mammalian model organism for basic research and drug discovery. Here we demonstrate an efficient methodology by applying transcription activator-like effector nucleases(TALENs) technol...The laboratory rat is a valuable mammalian model organism for basic research and drug discovery. Here we demonstrate an efficient methodology by applying transcription activator-like effector nucleases(TALENs) technology to generate Leptin receptor(Lepr) knockout rats on the Sprague Dawley(SD) genetic background. Through direct injection of in vitro transcribed m RNA of TALEN pairs into SD rat zygotes, somatic mutations were induced in two of three resulting pups. One of the founders carrying bi-allelic mutation exhibited early onset of obesity and infertility. The other founder carried a chimeric mutation which was efficiently transmitted to the progenies. Through phenotyping of the resulting three lines of rats bearing distinct mutations in the Lepr locus, we found that the strains with a frame-shifted or premature stop codon mutation led to obesity and metabolic disorders. However, no obvious defect was observed in a strain with an in-frame 57 bp deletion in the extracellular domain of Lepr. This suggests the deleted amino acids do not significantly affect Lepr structure and function. This is the first report of generating the Lepr mutant obese rat model in SD strain through a reverse genetic approach. This suggests that TALEN is an efficient and powerful gene editing technology for the generation of disease models.展开更多
Objective The leptin receptor,encoded by the LEPR gene,is involved in tumorigenesis.A potential functional variant of LEPR,rs1137101(Gln223Arg),has been extensively investigated for its contribution to the risk of dig...Objective The leptin receptor,encoded by the LEPR gene,is involved in tumorigenesis.A potential functional variant of LEPR,rs1137101(Gln223Arg),has been extensively investigated for its contribution to the risk of digestive system(DS)cancers,but results remain conflicting rather than conclusive.Here,we performed a case–control study and subsequent meta-analysis to examine the association between rs1137101 and DS cancer risk.Methods A total of 1,727 patients with cancer(gastric/liver/colorectal:460/480/787)and 800 healthy controls were recruited.Genotyping of rs1137101 was conducted using a polymerase chain reactionrestriction fragment length polymorphism(PCR-RFLP)assay and confirmed using Sanger sequencing.Twenty-four eligible studies were included in the meta-analysis.Results After Bonferroni correction,the case–control study revealed that rs1137101 was significantly associated with the risk of liver cancer in the Hubei Chinese population.The meta-analysis suggested that rs1137101 is significantly associated with the risk of overall DS,gastric,and liver cancer in the Chinese population.Conclusion The LEPR rs1137101 variant may be a genetic biomarker for susceptibility to DS cancers(especially liver and gastric cancer)in the Chinese population.展开更多
文摘为探究LEPR基因多态性的遗传特性,本研究以贵州白山羊为试验材料,运用DNA池结合直接测序方法进行LEPR基因的SNPs位点的筛选,继而对LEPR基因RNA的二级结构以及其所编码蛋白质的二级结构和三级结构进行生物信息分析。结果表明,在试验群体LEPR基因中共发现4个SNPs,分别为exon4-G246A(Asp-Asn)、exon8-C39T(同义突变)、intron8-G59A(内含子突变)和exon18-C94T(Ser-Leu)。经生物信息学软件分析表明,exon4-G246A(Asp-Asn)和exon18-C94T(Ser-Leu)位点突变前后的等位基因频率、LEPR m RNA的二级结构、LEPR蛋白质二级结构和三级结构均有改变。
基金supported by the State Key Development Programs of China (2012CB910400 to Mingyao Liu)the National Natural Science Foundation of China (31371455, 31171318 and 81330049)the Science and Technology Commission of Shanghai Municipality (14140900300)
文摘The laboratory rat is a valuable mammalian model organism for basic research and drug discovery. Here we demonstrate an efficient methodology by applying transcription activator-like effector nucleases(TALENs) technology to generate Leptin receptor(Lepr) knockout rats on the Sprague Dawley(SD) genetic background. Through direct injection of in vitro transcribed m RNA of TALEN pairs into SD rat zygotes, somatic mutations were induced in two of three resulting pups. One of the founders carrying bi-allelic mutation exhibited early onset of obesity and infertility. The other founder carried a chimeric mutation which was efficiently transmitted to the progenies. Through phenotyping of the resulting three lines of rats bearing distinct mutations in the Lepr locus, we found that the strains with a frame-shifted or premature stop codon mutation led to obesity and metabolic disorders. However, no obvious defect was observed in a strain with an in-frame 57 bp deletion in the extracellular domain of Lepr. This suggests the deleted amino acids do not significantly affect Lepr structure and function. This is the first report of generating the Lepr mutant obese rat model in SD strain through a reverse genetic approach. This suggests that TALEN is an efficient and powerful gene editing technology for the generation of disease models.
基金supported by the Fundamental Research Funds for the Central Universities(WUT:2020IB029)。
文摘Objective The leptin receptor,encoded by the LEPR gene,is involved in tumorigenesis.A potential functional variant of LEPR,rs1137101(Gln223Arg),has been extensively investigated for its contribution to the risk of digestive system(DS)cancers,but results remain conflicting rather than conclusive.Here,we performed a case–control study and subsequent meta-analysis to examine the association between rs1137101 and DS cancer risk.Methods A total of 1,727 patients with cancer(gastric/liver/colorectal:460/480/787)and 800 healthy controls were recruited.Genotyping of rs1137101 was conducted using a polymerase chain reactionrestriction fragment length polymorphism(PCR-RFLP)assay and confirmed using Sanger sequencing.Twenty-four eligible studies were included in the meta-analysis.Results After Bonferroni correction,the case–control study revealed that rs1137101 was significantly associated with the risk of liver cancer in the Hubei Chinese population.The meta-analysis suggested that rs1137101 is significantly associated with the risk of overall DS,gastric,and liver cancer in the Chinese population.Conclusion The LEPR rs1137101 variant may be a genetic biomarker for susceptibility to DS cancers(especially liver and gastric cancer)in the Chinese population.
基金supported by grants from the National Natural Science Foundation of China(No.81402582)the Scientific Research Foundation for Returned Scholars,Ministry of Education of China(No.48-12)
文摘肥胖已经成为全球性的公共卫生问题,严重影响人类的身体健康和生活品质。本文运用CRISPR/Cas9技术,构建了肥胖相关基因——瘦素受体(leptin receptor,lepr)和黑素皮质素受体4(melanocortin-4 receptor,mc4r)的斑马鱼突变体,并对其进行形态和功能分析。结果显示,lepr^(-/-)和mc4r^(-/-)斑马鱼在胚胎和幼鱼期没有明显异常,但在成年期,lepr^(-/-)和mc4r^(-/-)斑马鱼相比对照进食增多、体重增加、体脂含量升高,呈现肥胖表型。血糖测定结果显示,饱食喂养条件可以诱导lepr^(-/-)和mc4r^(-/-)成年斑马鱼出现糖耐量受损的现象。进一步地,运用real time RT-PCR对76个能量代谢相关基因在lepr^(-/-)和mc4r^(-/-)斑马鱼肝脏中转录表达水平进行检测,并与Lep^(ob/ob)小鼠肝脏c DNA microarray的数据比较,发现胰岛素/胰岛素样生长因子信号转导通路(insulin/IGF signaling pathway,ISS)相关的基因在lepr^(-/-)斑马鱼和Lep^(ob/ob)小鼠肝脏中表达变化具有较高的正相关性,提示肥胖调控网络在进化中维持了一定的功能保守性。
