The Mest （mesoderm-specific transcript） gene has been considered an imprinting gene in human and mouse, and was also confirmed in other mammals and flowering plants. To investigate the function and evolution of this...The Mest （mesoderm-specific transcript） gene has been considered an imprinting gene in human and mouse, and was also confirmed in other mammals and flowering plants. To investigate the function and evolution of this gene, the cDNA of full length Mest gene was obtained using 5＇- and 3＇-RACE from the Chinese Large Toad （Bufo gargarizans）. The transcript is 1 325bp in length which contains a complete open reading frame （ORF） encoding a polypeptide of 326 amino acids （GenBank accession number： ABQ10905）. There is a typical 0./13 hydrolase fold domain in the putative gene product, and it shows high similarity to sequence of homologous protein of Xenopus tropicali （86%）, mammlian （70% - 80%）. RT-PCR （reverse transcriptase-polymerase chain reaction） analysis demonstrated that the Bufo gargarizans Mest （BgMest） gene is expressed widely in testis, ovary, liver, kidney, spleen, brain, stomach and lung. The conservation of the BgMest gene sequences, protein secondary structure of the BgMest protein, in addition to the expression pattern of the BgMest gene, suggested that the function of BgMest was conserved in amphibians. However, the phylogenetic tree of the imprinting gene of the mammals and other vertebrates examined in this study indicated their divergent origins.展开更多
目的:探讨正常人的前列腺移行带(PZ)和外周带(TZ)基质成纤维细胞中MEST(mesoderm specific transcript)基因的甲基化水平变化和表达差异,及DNA甲基化抑制剂(5-Aza-CdR)对其表达水平的影响。方法:用硫化测序PCR(bisulfite sequencing PCR...目的:探讨正常人的前列腺移行带(PZ)和外周带(TZ)基质成纤维细胞中MEST(mesoderm specific transcript)基因的甲基化水平变化和表达差异,及DNA甲基化抑制剂(5-Aza-CdR)对其表达水平的影响。方法:用硫化测序PCR(bisulfite sequencing PCR,BSP)和实时荧光定量PCR方法分别检测5-Aza-CdR处理前、后在前列腺PZ和TZ原代成纤维细胞中MEST基因的甲基化水平和相应的mRNA表达。结果:MEST基因在PZ成纤维细胞中为低甲基化高表达,在TZ成纤维细胞中为高甲基化低表达。加入5-Aza-CdR后,MEST在PZ和TZ成纤维细胞中都为去甲基化,而表达水平上升,但是TZ成纤维细胞表达水平的改变比PZ成纤维细胞大。结论:MEST基因的DNA甲基化差异可能是前列腺外周带和移行带成纤维细胞生物学行为差异的分子基础。展开更多
The theory of MeSH thesaurus method is analyzed.MeSH thesaurus is highly conceptual and coordinative.It expresses the content of a document through MeSH descriptor concept.
基金Supported by the National Natural Science Foundation of China (No.30770296)the Natural and Science Key Project of Anhui Educational Department (KJ2007A022)the Key Lab Project of Biotic Environment and Ecology Safety in Anhui Province (2006)
文摘The Mest （mesoderm-specific transcript） gene has been considered an imprinting gene in human and mouse, and was also confirmed in other mammals and flowering plants. To investigate the function and evolution of this gene, the cDNA of full length Mest gene was obtained using 5＇- and 3＇-RACE from the Chinese Large Toad （Bufo gargarizans）. The transcript is 1 325bp in length which contains a complete open reading frame （ORF） encoding a polypeptide of 326 amino acids （GenBank accession number： ABQ10905）. There is a typical 0./13 hydrolase fold domain in the putative gene product, and it shows high similarity to sequence of homologous protein of Xenopus tropicali （86%）, mammlian （70% - 80%）. RT-PCR （reverse transcriptase-polymerase chain reaction） analysis demonstrated that the Bufo gargarizans Mest （BgMest） gene is expressed widely in testis, ovary, liver, kidney, spleen, brain, stomach and lung. The conservation of the BgMest gene sequences, protein secondary structure of the BgMest protein, in addition to the expression pattern of the BgMest gene, suggested that the function of BgMest was conserved in amphibians. However, the phylogenetic tree of the imprinting gene of the mammals and other vertebrates examined in this study indicated their divergent origins.
文摘目的:探讨正常人的前列腺移行带(PZ)和外周带(TZ)基质成纤维细胞中MEST(mesoderm specific transcript)基因的甲基化水平变化和表达差异,及DNA甲基化抑制剂(5-Aza-CdR)对其表达水平的影响。方法:用硫化测序PCR(bisulfite sequencing PCR,BSP)和实时荧光定量PCR方法分别检测5-Aza-CdR处理前、后在前列腺PZ和TZ原代成纤维细胞中MEST基因的甲基化水平和相应的mRNA表达。结果:MEST基因在PZ成纤维细胞中为低甲基化高表达,在TZ成纤维细胞中为高甲基化低表达。加入5-Aza-CdR后,MEST在PZ和TZ成纤维细胞中都为去甲基化,而表达水平上升,但是TZ成纤维细胞表达水平的改变比PZ成纤维细胞大。结论:MEST基因的DNA甲基化差异可能是前列腺外周带和移行带成纤维细胞生物学行为差异的分子基础。
文摘The theory of MeSH thesaurus method is analyzed.MeSH thesaurus is highly conceptual and coordinative.It expresses the content of a document through MeSH descriptor concept.
