Ontology highlight
ABSTRACT:
PROVIDER: PRJNA861810 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR20568500_1.fastq.gz | Fastqsanger.gz | |||
| SRR20568500_2.fastq.gz | Fastqsanger.gz | |||
| SRR20568501_1.fastq.gz | Fastqsanger.gz | |||
| SRR20568501_2.fastq.gz | Fastqsanger.gz | |||
| SRR20568502_1.fastq.gz | Fastqsanger.gz |
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Project description:Summer mortality of Crassostrea gigas is the result of a complex interaction between oysters, their environment and pathogens. A large genetic basis and a high heritability were demonstrated for the observed variation in resistance to summer mortality, which offered the possibility to develop lines of oysters that were resistant (R) or susceptible (S) to summer mortality. Previously, genome-wide expression profiling of R and S oyster gonads highlighted reproduction and antioxidant defense as constitutive pathways that operate differentially between these two lines. Here, we show that signaling in innate immunity also operates differentially between these lines and we postulated that it is at the main origin of their difference of survival in the field. From the already published microarray data, we employed an ANOVA analysis that reveals a specific “immune” profile at the date preceding the mortality. In addition, we conducted a microarray profiling of two other tissues, gills and muscle, that also showed an over-representation of the immune genes (46%) among the selected genes. Eleven genes were pinpointed to be simultaneously differentially expressed between R and S lines in the three tissues. Among them, ten are related to “Immune Response”. The kinetics of their mRNA levels appeared clearly different between lines and suggests that in environment, R oysters had the capacity to modulate signaling in innate immunity whereas S oysters did not. This study enhances our understanding of the complex summer mortality syndrome and provides candidates of interest for further functional and genetics studies.
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Project description:The Chinese surf clam (Mactra chinensis) is an economically important clam, distributed in Liaoning and Shandong province. In recently years，because of coastal environmental deterioration and overfishing, the natural population of M. chinensis have considerably declined . In this paper, we study the microRNA transcriptome of gills, including control and experimental group was sequenced through Illumina Hi-seq 2500 CE. And the differential expression was used to find the functional microRNA response to the Cd2+ exposure. Through Illumina Hi-seq 2500, a total of 14,415,256 clean reads and 15,570,111 clean reads were yielded in the gill of control and experimental group respectively. A total of 14,584,077 sRNA, in which there are 12,505,055 sRNA shared by S01 & S02, including 187,859 unique sRNA. The distribution of the sRNA length in the two library was similar, most of them were 26-27 nt. 27 nt was the most abundant length in S01, followded by 28 nt, 26 nt, and 23 nt; 26 nt was the most abundant length in S02, and followed by 27 nt, 28 nt and 23 nt. 50 miRNA was found in unique sRNA, including 38 conserved and 12 novel genes. The most abundant length of microRNA in the two library was the same, 23 nt. Through the analyze of differential expression analysis, the expression of 5 miRNA was induced with significantly difference, and 17 miRNA was down regulated and 28 miRNA was up regulated without significantly difference. So the miRNA in gill of M. chinensis might involve the environmental stress. 542 target genes were yielded when the 50 miRNA were hit to mRNA genome. And the target genes of differential expression miRNA were annotated by hitting to the NCBI database, and 4 genes hit to the COG, 1 genes hit to the GO, 5 genes hit to the KEGG and 11 genes hit to the nr database. The genes hit to the NCBI database include E3 ubiquitin-protein ligase, Wnt signaling pathway and Regulator of G-protein signaling 22.
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