microRNA(miRNA) gene clusters are a group of miRNA genes clustered within a proximal distance on a chromosome.Although a large number of miRNA clusters have been uncovered in animal and plant genomes,the functional co...microRNA(miRNA) gene clusters are a group of miRNA genes clustered within a proximal distance on a chromosome.Although a large number of miRNA clusters have been uncovered in animal and plant genomes,the functional consequences of this arrangement are still poorly understood.Located in a polycistron,the coexpressed miRNA clusters are pivotal in coordinately regulating multiple processes,including embryonic development,cell cycles and cell differentiation.In this review,based on recent progress,we discuss the genomic diversity of miRNA gene clusters,the coordination of expression and function of the clustered miRNAs,and the evolutionarily adaptive processes with gain and loss of the clustering miRNA genes mediated by duplication and transposition events.展开更多
BACKGROUND： Liver regeneration is a complex process. micro RNAs（mi RNAs） are short, single-stranded RNAs that modify gene expression at the post-transcriptional level. Recent investigations have revealed that mi RN...BACKGROUND： Liver regeneration is a complex process. micro RNAs（mi RNAs） are short, single-stranded RNAs that modify gene expression at the post-transcriptional level. Recent investigations have revealed that mi RNAs are closely linked to liver regeneration.DATA SOURCES： All included studies were obtained from Pub Med, Embase, the Science Direct databases and Web of Science, with no limitation on publication year. Only studies published in English were considered.RESULTS： We grouped studies that involved mi RNA and liver regeneration into two groups： mi RNAs as promoters and as inhibitors of liver regeneration. We summarized the relevant mi RNAs separately from the related pathways.CONCLUSIONS： Blocking or stimulating the pathways of mi RNAs in liver regeneration may be novel therapeutic strategies in future regeneration-related liver managements. We may discover additional chemotherapy targets of mi RNA.展开更多
Objective： To research the silence of NBS1 after transfection microRNA expressing eukaryotic recombinants and the changes of telomerase activation in telomerase-positive cell line Hela. Methods： According to the seq...Objective： To research the silence of NBS1 after transfection microRNA expressing eukaryotic recombinants and the changes of telomerase activation in telomerase-positive cell line Hela. Methods： According to the sequence of NBS1 mRNA, the NBS1 pre-microRNA was designed and synthesized, then cloned into the GFP reporter pcDNA6.2-GW/EmGFP-miR vector and transfected into Hela cells. The integrity of the insert fragment was verified through colony PCR and sequencing analysis. The NBS1 gene expression of NBS1 microRNA recombinants was detected by Real-Time PCR and western blot. Telomerase activity in Hela cells was assayed by TRAP-PCR-EB. Results： Sequences of insert fragment in microRNA expressing recombinants were correct. The NBS1 gene expression was decreased, and the telomerase activation of Hela cell reduced. Conclusion： NBS1 microRNA inhibits NBS1 gene expression, and depresses telomerase activation of Hela cells. This confirms that there is relevance between NBS 1 gene and telomerase activity.展开更多
Phytophthora root rot is one of the most prevalent diseases in the world,which can infect the seedlings and plants,with substantial negative impact on soybean yield and quality.MicroRNAs （miRNAs） are a class of post...Phytophthora root rot is one of the most prevalent diseases in the world,which can infect the seedlings and plants,with substantial negative impact on soybean yield and quality.MicroRNAs （miRNAs） are a class of post-transcriptional regulators of gene expression during growth and development of organisms.A soybean disease-resistance variety Suinong 10 was inoculated with Phytophthora sojae race No.1,and the specific miRNA resistant expression profile was acquired by microarray for the first time.Different expressional miRNAs have been found after comparing the results of the treated sample with the control sample.Furthermore,the target genes of different expressional miRNAs were predicted.Two miRNAs,cbr-mir-241 and ath-miR854a,regulated the disease-resistance process directly through their targets,some enzymes.Another two miRNAs,gma-miR169a and ath-miR169h,participated in disease-resistance regulation as transcription factors.Similarly,one miRNA,ptc-miR164f,has been reported to regulate the plant development.All of these studies would be served as the foundation for exploring the resistance mechanism.展开更多
基金Supported by State Key Program of National Natural Science of China(Grant No.306300130)
文摘microRNA(miRNA) gene clusters are a group of miRNA genes clustered within a proximal distance on a chromosome.Although a large number of miRNA clusters have been uncovered in animal and plant genomes,the functional consequences of this arrangement are still poorly understood.Located in a polycistron,the coexpressed miRNA clusters are pivotal in coordinately regulating multiple processes,including embryonic development,cell cycles and cell differentiation.In this review,based on recent progress,we discuss the genomic diversity of miRNA gene clusters,the coordination of expression and function of the clustered miRNAs,and the evolutionarily adaptive processes with gain and loss of the clustering miRNA genes mediated by duplication and transposition events.
文摘BACKGROUND： Liver regeneration is a complex process. micro RNAs（mi RNAs） are short, single-stranded RNAs that modify gene expression at the post-transcriptional level. Recent investigations have revealed that mi RNAs are closely linked to liver regeneration.DATA SOURCES： All included studies were obtained from Pub Med, Embase, the Science Direct databases and Web of Science, with no limitation on publication year. Only studies published in English were considered.RESULTS： We grouped studies that involved mi RNA and liver regeneration into two groups： mi RNAs as promoters and as inhibitors of liver regeneration. We summarized the relevant mi RNAs separately from the related pathways.CONCLUSIONS： Blocking or stimulating the pathways of mi RNAs in liver regeneration may be novel therapeutic strategies in future regeneration-related liver managements. We may discover additional chemotherapy targets of mi RNA.
文摘Objective： To research the silence of NBS1 after transfection microRNA expressing eukaryotic recombinants and the changes of telomerase activation in telomerase-positive cell line Hela. Methods： According to the sequence of NBS1 mRNA, the NBS1 pre-microRNA was designed and synthesized, then cloned into the GFP reporter pcDNA6.2-GW/EmGFP-miR vector and transfected into Hela cells. The integrity of the insert fragment was verified through colony PCR and sequencing analysis. The NBS1 gene expression of NBS1 microRNA recombinants was detected by Real-Time PCR and western blot. Telomerase activity in Hela cells was assayed by TRAP-PCR-EB. Results： Sequences of insert fragment in microRNA expressing recombinants were correct. The NBS1 gene expression was decreased, and the telomerase activation of Hela cell reduced. Conclusion： NBS1 microRNA inhibits NBS1 gene expression, and depresses telomerase activation of Hela cells. This confirms that there is relevance between NBS 1 gene and telomerase activity.
基金supported by the National Natural Science Fundation of China (30971809)
文摘Phytophthora root rot is one of the most prevalent diseases in the world,which can infect the seedlings and plants,with substantial negative impact on soybean yield and quality.MicroRNAs （miRNAs） are a class of post-transcriptional regulators of gene expression during growth and development of organisms.A soybean disease-resistance variety Suinong 10 was inoculated with Phytophthora sojae race No.1,and the specific miRNA resistant expression profile was acquired by microarray for the first time.Different expressional miRNAs have been found after comparing the results of the treated sample with the control sample.Furthermore,the target genes of different expressional miRNAs were predicted.Two miRNAs,cbr-mir-241 and ath-miR854a,regulated the disease-resistance process directly through their targets,some enzymes.Another two miRNAs,gma-miR169a and ath-miR169h,participated in disease-resistance regulation as transcription factors.Similarly,one miRNA,ptc-miR164f,has been reported to regulate the plant development.All of these studies would be served as the foundation for exploring the resistance mechanism.
