Project description:Macrobrachium nipponense is one of the commonest species threatened by ambient superfluous nitrite. The mechanism of nitrite stress at the molecular level was studied using de novo RNA-Seq to explore the molecular pathways in M. nipponense exposed to the acute nitrite stress (26.05 mg/L nitrite-N) for 24h and the chronic nitrite stress (6.58 mg/L nitrite-N) for 21d. A total of 175.13 million reads were obtained and assembled into 58,871 unigenes with an average length of 1,028.7 bp and N50 of 1,294bp. 2,824 and 2,610 unigenes in the acute and chronic nitrite stress were significantly differentially expressed respectively. Based on the change in GO analysis and KEGG pathway analysis, pathways both in the acute and chronic nitrite stress were glycosphingolipid biosynthesis - ganglio series, alanine aspartate and glutamate metabolism, biotin metabolism and amino sugar and nucleotide sugar metabolism which revealed the commonly functional pathways in acute and chronic nitrite stress. The markedly altered pathways were divided into four sections of immunity, metabolism, cell and others. Immunity section contained the most pathways among the classifications as phagosome, folate biosynthesis, glycerolipid metabolism, glycine, serine and threonine metabolism, selenoamino acid metabolism, cysteine and methionine metabolism, amino sugar and nucleotide sugar metabolism and taurine and hypotaurine metabolism in the acute nitrite stress and lysosome, alanine, aspartate and glutamate metabolism, arginine and proline metabolism, glycosaminoglycan degradation and amino sugar and nucleotide sugar metabolism in the chronic nitrite stress. This is the first report of whole molecular responses of M. nipponense under acute and chronic nitrite stress through de novo transcriptome sequencing. The findings of this study will further promote the understanding of the underlying molecular mechanisms of the nitrite stress for crustacean species.
Project description:MicroRNAs (miRNAs) function as regulators in a broad range of phenotypes. The Oriental River Prawn (Macrobrachium nipponense) is an important commercial species that is widely distributed in freshwater and low-salinity estuarine regions of China and other Asian countries. To date, there are no reports describing M. nipponense miRNAs.
Project description:MicroRNAs (miRNAs) function as regulators in a broad range of phenotypes. The Oriental River Prawn (Macrobrachium nipponense) is an important commercial species that is widely distributed in freshwater and low-salinity estuarine regions of China and other Asian countries. To date, there are no reports describing M. nipponense miRNAs.
Project description:MicroRNAs (miRNAs) function as regulators in a broad range of phenotypes. The Oriental River Prawn (Macrobrachium nipponense) is an important commercial species that is widely distributed in freshwater and low-salinity estuarine regions of China and other Asian countries. To date, there are no reports describing M. nipponense miRNAs. In this study, Solexa deep sequencing technology was used for high-throughput analysis of miRNAs in a small RNA library isolated from four M. nipponense tissues (gill, hepatopancreas, muscle and hemocytes). In total, 9,227,356 reads were obtained, 4,293,155 of which were related to 267 unique miRNAs, including 203 conserved and 64 prawn-specific miRNAs. Furthermore, miRNA features including length distribution and end variations were characterized. Annotation of targets revealed a broad range of biological processes and signal transduction pathways regulated by M. nipponense miRNAs. In addition, 880 co-expressed and 39 specific (25 normoxia-specific and 14 hypoxia-specific) miRNAs of four combined tissues of prawns that may be involved in the response to hypoxia were confirmed using miRNA microarray analysis. Real-time quantitative PCR (qPCR) analysis of eight miRNAs in the normoxia and hypoxia groups showed good concordance between the sequencing and qPCR data. This study provides the first large-scale identification and characterization of M. nipponense miRNAs and their potential targets, and represents a foundation for further characterization of their roles in the regulation of the diversity of hypoxia processes.
Project description:MicroRNAs (miRNAs) function as regulators in a broad range of phenotypes. The Oriental River Prawn (Macrobrachium nipponense) is an important commercial species that is widely distributed in freshwater and low-salinity estuarine regions of China and other Asian countries. To date, there are no reports describing M. nipponense miRNAs. In this study, Solexa deep sequencing technology was used for high-throughput analysis of miRNAs in a small RNA library isolated from four M. nipponense tissues (gill, hepatopancreas, muscle and hemocytes). In total, 9,227,356 reads were obtained, 4,293,155 of which were related to 267 unique miRNAs, including 203 conserved and 64 prawn-specific miRNAs. Furthermore, miRNA features including length distribution and end variations were characterized. Annotation of targets revealed a broad range of biological processes and signal transduction pathways regulated by M. nipponense miRNAs. In addition, 880 co-expressed and 39 specific (25 normoxia-specific and 14 hypoxia-specific) miRNAs of four combined tissues of prawns that may be involved in the response to hypoxia were confirmed using miRNA microarray analysis. Real-time quantitative PCR (qPCR) analysis of eight miRNAs in the normoxia and hypoxia groups showed good concordance between the sequencing and qPCR data. This study provides the first large-scale identification and characterization of M. nipponense miRNAs and their potential targets, and represents a foundation for further characterization of their roles in the regulation of the diversity of hypoxia processes.
Project description:To identify genes involved in nutrition metabolism of Macrobrachium nipponense, two independent cDNA libraries from hepatopancreas and muscle were constructed through high-throughput next-generation sequencing techniques. A total of 112,548,142 and 90,140,774 high quality reads were generated in the two cDNA libraries, respectively. Clustering and assembly of these reads produced a nonredundant set of 98,560 unique sequences, with an average unigene length of 793 bp. The unigene sequences were subjected to GO, COG and KEGG functional classification. A large number of differentially expressed genes were recovered by comparison of the two tissues. The differentially expressed and their functions were predicted by KEGG pathway mapping. Furthermore, 17,971SSRs and 32,935 high-confidence SNPs were identified in the two EST datasets. This study lays the foundation for further research on gene function analysis in nutrition metabolism of M. nipponense. sample 1: hepatopancreas; sample 2: muscle
Project description:To identify genes involved in nutrition metabolism of Macrobrachium nipponense, two independent cDNA libraries from hepatopancreas and muscle were constructed through high-throughput next-generation sequencing techniques. A total of 112,548,142 and 90,140,774 high quality reads were generated in the two cDNA libraries, respectively. Clustering and assembly of these reads produced a nonredundant set of 98,560 unique sequences, with an average unigene length of 793 bp. The unigene sequences were subjected to GO, COG and KEGG functional classification. A large number of differentially expressed genes were recovered by comparison of the two tissues. The differentially expressed and their functions were predicted by KEGG pathway mapping. Furthermore, 17,971SSRs and 32,935 high-confidence SNPs were identified in the two EST datasets. This study lays the foundation for further research on gene function analysis in nutrition metabolism of M. nipponense.