Project description:Chromosome-level genome assembly of the hard-shelled mussel Mytilus coruscus, a widely distributed species from the temperate areas of East Asia
Project description:Blue mussel larvae were fed, in a first group, a balanced diet of essential fatty acids (EFAs) provided by a cocktail diet (COC) from three algal species. Larvae were cultured in three separate tanks from hatching, 0 day post-fertilization (DPF) until 42 DPF. Treated larvae were fed a deficient diet (Tiso) that contains low levels of arachidonic acid (AA) and eicosapentaenoic acid (EPA), two EFAs necessary for larval development, performance, and survival. The goal is to identify coordinated patterns of gene expression and understand their predictive function in relation to growth and mortality during early developmental stages of the blue mussel Mytilus edulis. In order to understand the mechanisms by which growth and survival drive an organism to the full range of its adaptation, we de novo assembled of the mussel transcriptome during early development using next-generation sequencing (NGS) technology, then designed customized microarrays targeting every developmental stage, which encompass major transitions in tissue organization of the fast-evolved blue mussel
Project description:Blue mussel larvae were fed, in a first group, a balanced diet of essential fatty acids (EFAs) provided by a cocktail diet (COC) from three algal species. Larvae were cultured in three separate tanks from hatching, 0 day post-fertilization (DPF) until 42 DPF. Treated larvae were fed a deficient diet (Tiso) that contains low levels of arachidonic acid (AA) and eicosapentaenoic acid (EPA), two EFAs necessary for larval development, performance, and survival. The goal is to identify coordinated patterns of gene expression and understand their predictive function in relation to growth and mortality during early developmental stages of the blue mussel Mytilus edulis. In order to understand the mechanisms by which growth and survival drive an organism to the full range of its adaptation, we de novo assembled of the mussel transcriptome during early development using next-generation sequencing (NGS) technology, then designed customized microarrays targeting every developmental stage, which encompass major transitions in tissue organization of the fast-evolved blue mussel Two experimental conditions, COC and Tiso diets. Biological replicates 3 culture replicate per stage of development for 5 stages of development. Eggs and trocophore larvae did not undertake treatments
Project description:Transcriptional profiling of the mantle tissue across the four stages of male gonads development (winter peak) in a natural population of the marine mussel Mytilus galloprovincialis sampled in the Bizerta Lagoon, Tunisia, across November 2007 -March 2008. Background: Seasonal environmental changes may affect the physiology of Mytilus galloprovincialis (Lam.), an intertidal filter-feeder bivalve occurring commonly in Mediterranean and Atlantic coastal areas. We investigated seasonal variations in relative transcript abundance of the digestive gland and the mantle (gonads) of males and females. To identify gene expression trends, we used a medium-density cDNA microarray (1.7 K probes) in dual-color competitive hybridization analyses. Results: Hierarchical clustering of digestive gland microarray data showed two main branches, distinguishing profiles associated with the “hot” months (May–August) from the other months. Genes involved in chitin metabolism, associated with mussel nutrition and digestion, showed higher expression during summer. Moreover, we found different gene expression patterns in the digestive glands of males and females during the four stages of mussel gonadal development. Microarray data from gonadal transcripts also displayed clear patterns during the different developmental phases with peak relative mRNA abundance at the ripe phase (stage III) for both sexes. Conclusion: These data showed a clear temporal pattern in gene expression profiles of mussels sampled over an annual cycle. Physiological response to thermal variation, food availability, and reproductive status across months may contribute to variation in gene expression.
Project description:Transcriptional profiling of the mantle tissue across the four stages of female gonads development (winter peak) in a natural population of the marine mussel Mytilus galloprovincialis sampled in the Bizerta Lagoon, Tunisia, across November 2007 -March 2008. Background: Seasonal environmental changes may affect the physiology of Mytilus galloprovincialis (Lam.), an intertidal filter-feeder bivalve occurring commonly in Mediterranean and Atlantic coastal areas. We investigated seasonal variations in relative transcript abundance of the digestive gland and the mantle (gonads) of males and females. To identify gene expression trends, we used a medium-density cDNA microarray (1.7 K probes) in dual-color competitive hybridization analyses. Results: Hierarchical clustering of digestive gland microarray data showed two main branches, distinguishing profiles associated with the “hot” months (May–August) from the other months. Genes involved in chitin metabolism, associated with mussel nutrition and digestion, showed higher expression during summer. Moreover, we found different gene expression patterns in the digestive glands of males and females during the four stages of mussel gonadal development. Microarray data from gonadal transcripts also displayed clear patterns during the different developmental phases with peak relative mRNA abundance at the ripe phase (stage III) for both sexes. Conclusion: These data showed a clear temporal pattern in gene expression profiles of mussels sampled over an annual cycle. Physiological response to thermal variation, food availability, and reproductive status across months may contribute to variation in gene expression.
Project description:We utilized peptidomics technology to identify natural Histone-derived-peptides in M. coruscus serum. Using peptidomic technique, a total of 2,335 peptides was identified from the four groups of mussel serum, including the serum sample of the control mussel group and other three mussel groups with microbe-injection. Of which, 712 peptides with -10lgP≥20 and FDR <0.01were matched to 92 histones by searching against M. coruscus histone database. Using peptidomic technique, a total of 2,335 peptides was identified from the four groups of mussel serum, including the serum sample of the control mussel group and other three mussel groups with microbe-injection. Of which, 712 peptides with -10lgP≥20 and FDR <0.01were matched to 92 histones by searching against M. coruscus histone database.
Project description:Mediterranean mussels are a worldwide spread bivalve species with extraordinary biological success. One of the reasons of this success could be the reproduction strategy of bivalves, characterized by the presence of trochophore larvae. Larval development in bivalves has been a topic of raising interest in the scientific community but it deserves much more attention. The principal objective of this work was to study the transcriptomic profile of the ontogeny of M. galloprovincialis analyzing the gene expression in different developmental stages, from oocytes to seed. For this purpose, after conducting a 454 sequencing of transcriptome of mussel hemocytes, adult tissues and larvae, a new DNA microarray comprising sequences of was designed and developed. The studied developmental stages: unfertilized oocytes, veliger (3 days post fertilization; dpf) and pediveliger (20dpf) larvae, settled juveniles (25dpf) and seed (30dpf), showed very different transcriptomic profiles and clustered in groups defining their characteristic gene expression along ontogeny.
Project description:Transcriptional profiling of the mantle tissue across the four stages of female gonads development (winter peak) in a natural population of the marine mussel Mytilus galloprovincialis sampled in the Bizerta Lagoon, Tunisia, across November 2007 -March 2008. Background: Seasonal environmental changes may affect the physiology of Mytilus galloprovincialis (Lam.), an intertidal filter-feeder bivalve occurring commonly in Mediterranean and Atlantic coastal areas. We investigated seasonal variations in relative transcript abundance of the digestive gland and the mantle (gonads) of males and females. To identify gene expression trends, we used a medium-density cDNA microarray (1.7 K probes) in dual-color competitive hybridization analyses. Results: Hierarchical clustering of digestive gland microarray data showed two main branches, distinguishing profiles associated with the “hot” months (May–August) from the other months. Genes involved in chitin metabolism, associated with mussel nutrition and digestion, showed higher expression during summer. Moreover, we found different gene expression patterns in the digestive glands of males and females during the four stages of mussel gonadal development. Microarray data from gonadal transcripts also displayed clear patterns during the different developmental phases with peak relative mRNA abundance at the ripe phase (stage III) for both sexes. Conclusion: These data showed a clear temporal pattern in gene expression profiles of mussels sampled over an annual cycle. Physiological response to thermal variation, food availability, and reproductive status across months may contribute to variation in gene expression. Mantle tissue from individual animals in different gonad maturation stages were analyzed in a complete loop design. Dual color competitive hybridizations (stage 4 vs stage 1, 2 vs 1, 3 vs 2, 4 vs 3) including label swap. Single individuals. Four biological replicates. One replicate per array.
Project description:Transcriptional profiling of the mantle tissue across the four stages of male gonads development (winter peak) in a natural population of the marine mussel Mytilus galloprovincialis sampled in the Bizerta Lagoon, Tunisia, across November 2007 -March 2008. Background: Seasonal environmental changes may affect the physiology of Mytilus galloprovincialis (Lam.), an intertidal filter-feeder bivalve occurring commonly in Mediterranean and Atlantic coastal areas. We investigated seasonal variations in relative transcript abundance of the digestive gland and the mantle (gonads) of males and females. To identify gene expression trends, we used a medium-density cDNA microarray (1.7 K probes) in dual-color competitive hybridization analyses. Results: Hierarchical clustering of digestive gland microarray data showed two main branches, distinguishing profiles associated with the M-bM-^@M-^\hotM-bM-^@M-^] months (MayM-bM-^@M-^SAugust) from the other months. Genes involved in chitin metabolism, associated with mussel nutrition and digestion, showed higher expression during summer. Moreover, we found different gene expression patterns in the digestive glands of males and females during the four stages of mussel gonadal development. Microarray data from gonadal transcripts also displayed clear patterns during the different developmental phases with peak relative mRNA abundance at the ripe phase (stage III) for both sexes. Conclusion: These data showed a clear temporal pattern in gene expression profiles of mussels sampled over an annual cycle. Physiological response to thermal variation, food availability, and reproductive status across months may contribute to variation in gene expression. Mantle tissue from individual animals in different gonad maturation stages were analyzed in a complete loop design. Dual color competitive hybridizations (stage 4 vs stage 1, 2 vs 1, 3 vs 2, 4 vs 3) including label swap. Single individuals. Four biological replicates. One replicate per array.
Project description:A healthy existence relationship between mussels and environment relies on suitable PH, adequate oxygen and suitable temperature. Besides ocean acidification, ocean warming has been shown to cause mussel dead, a phenomenon responsible for extensive mussel dead around the word. How heat stress impacts mussel alive is poorly understood. We founded that. The superoxide dismutase (SOD) activity of two treatment groups were significantly higher than that of control group, and the activity of acid phosphatase (ACP) was significantly higher in two treatment groups than control group. The lactate dehydrogenase (LDH) activity of 26 ℃ treatment group was significantly higher than that of control group, and the LDH activity of 33 ℃ treatment group was significantly lower than that of control group. Cellular content of lysozyme (LZM) was significantly higher in two treatment groups than control group. In this study, we applied TMT quantification to investigate how Mytilus coruscus responds to heat stress (26 ℃, 33 ℃). We identified 1652 to 1878 differentially expressed proteins (DEPs) from these heat conditions, among which 897 were commonly regulated by all the two temperature and were significantly enriched in nutrients digestion and absorption (e. g. fat digestion and absorption). Furthermore, proteins associated with nutrients metabolism, signaling pathways (p53 signaling pathway and MAPK signaling pathway)and energy metabolism (e. g. TCA cycle) were impacted, suggesting that the ability of basic metabolism of Mytilus coruscus may be altered by heat stress.