Project description:Purpose: The goal of this study was to assess the differential gene expression between control and leptin treated pituitary rostral pars distalis' of the tilapia (Oreochromis mossambicus). Methods: Pituitary mRNA profiles from control (PBS) and leptin (100nM) treated tilapia (Oreochromis mossambicus) pituitary rostral pars disatalis were generated by deep sequencing using Illumina MiSeq. The sequence reads that passed quality filters were analyzed at the transcript abundance level using ANOVA (ANOVA) and BowTie2 followed by Cufflinks. Results: Differential gene expression identified 1995 genes that were differentially expressed in the pituitary rostral pars distalis treated with leptin compared to PBS treated controls. These genes were indicated to be functionally involved in numerous biological processes including glycolyiss. Conclusions: Our study represents the first detailed pituitary rostral pars distalis transcriptomes in the tilapia and identifies leptin as a major stimulator of glycolysis at the cellular level in teleost fishes.
Project description:In fish, the sex determining mechanisms can broadly be classified as genotypic (GSD), temperature-dependent (TSD), or genotypic plus temperature effects (GSD+TE). For the fish species with TSD or GSD+TE, extremely high or low temperature can affect its sex determination and differentiation. For long time, the underlying changes in DNA methylation that occur during high or low temperature induced sex reversal have not been fully clarified. In this study, we used Nile tilapia as a model to perform a genome-wide survey of differences in DNA methylation in female and male gonads between control and high temperature induced groups using methylated DNA immunoprecipitation (MeDIP). We identified the high temperature induction-related differentially methylated regions (DMRs), and performed functional enrichment analysis for genes exhibiting DMR. These identified differentially methylated genes were potentially involved in the connection between environmental temperature and sex reversal in Nile tilapia. In this study, four samples (control females, CF; control males, CM; induced females, IF; induced males, IM) were analyzed.
