Project description:We sequenced mRNA from 9 liver samples of juvenile largemouth bass (Micropterus salmoides) taken from different lead concentration exposure treatment fish and control fish to investigate the transcriptome and comparative expression profiles of largemouth bass liver undergoing lead exposure.
Project description:The first GSSM of V. vinifera was reconstructed (MODEL2408120001). Tissue-specific models for stem, leaf, and berry of the Cabernet Sauvignon cultivar were generated from the original model, through the integration of RNA-Seq data. These models have been merged into diel multi-tissue models to study the interactions between tissues at light and dark phases.
Project description:Intensive aquaculture and environmental changes will inevitably lead to hypoxic stress for largemouth bass (Micropterus salmoides). To better understand the hypoxia responds mechanisms of largemouth bass, we compared the miRNA profile in liver under different environmental DO to determine which miRNAs are most affected during hypoxia. A total of 266 miRNAs were identified, and 84 miRNAs were differentially expressed compared with in control group. GO and KEGG analysis indicated that the miRNAs may play important roles in environment information processing. Specifically, we considered the VEGF signaling pathway, Phosphatidylinositol signaling system and MAPK signaling pathway, the results show that, the 13 miRNAs (miR-15b-5p, miR-30a-3p, miR-133a-3p, miR-19d-5p, miR-1288-3p, miR456, miR-96-5p, miR-23a-3p, miR-23b, miR-214, miR-24, miR-20a-3p and miR-2188-5p) involved in these three pathways are significantly down-regulated during hypoxia stress. And 12 target genes of these miRNAs were showed a higher degree of expression. We found the obvious negative correlation between miRNA and their target mRNAs, providing several miRNA-mRNA interaction networks in largemouth bass in response to hypoxia. Although relatively little information is currently available concerning the biological function of miRNAs identified to date, we strongly suggest that miRNAs play an important role in modulating gene expression involved in the physiological response to hypoxic stress in the fish liver.
Project description:Male largemouth bass were injected with 25 mg/kg MXC and sacrificed after 48 hours; liver dissected and used for total RNA extraction Keywords: Methoxychlor injection; single injection and time point The organochlorine pesticide methoxychlor (MXC) (1,1,1-trichloro-2,2-bis(p-methoxyphenyl)ethane) has been used increasingly as an insecticide since the banning of DDT, the primary advantage being that MXC is rapidly metabolized and does not show high levels of bioaccumulation in non-target organisms. However, studies have shown that MXC can be metabolized into additional metabolites, such as mono-demethylated 2-(p-hydroxyphenyl)-2-(p-methoxyphenyl)-1,1,1-trichloroethane (OH-MXC) and bis-demethylated 2,2-bis(p-hydroxyphenyl)-1,1,1-trichloroethane (HPTE), both of which are estrogenic in mammals. In addition, there is increased potential for disruptions to normal hepatic physiology (Schlenk et al., 1998; Stuchal et al., 2006). The objectives of the present study were to study the hepatic genomic response in male largemouth bass to an i.p. injection of MXC. We performed a microarray analysis on 25 mg/kg MXC 48 hour injection because there was a significant induction of ERα and ERβb mRNA in the liver which was comparable to a 48 hour 1 mg/kg injection of E2 (previous work done by Blum et al., 2008; Aquat Toxicol. 86(4), 459-469). We chose the liver because of the significant role this tissue plays in detoxification of contaminants and due to the high capacity to produce vitellogenin in response to estrogenic chemicals. We were also interested in comparing the genomic response of MXC to estradiol alone to identify putative candidate genes and pathways that may be specific to MXC and not due to direct estrogenic effects mediated via E2 receptors. Largemouth bass injected with single i.p. with 25 mg/kg methoxychlor; sacrificed 48 days later,liver tissue studied. 4 individual liver samples (control and treatment)