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MicroRNA expression profiles from eggs of different qualities associated with post-ovulatory ageing in rainbow trout

ABSTRACT: Egg quality is an important aspect in rainbow trout farming. Post-ovulatory aging is one of the most important factors affecting egg quality. MicroRNAs (miRNAs) are the major regulators in various biological processes and their expression profiles could serve as reliable biomarkers for various pathological and physiological conditions. Egg samples from 32 females on day 1, day 7, and day 14 post-ovulation (D1PO, D7PO and D14PO), which had the fertilization rates of 91.8%, 73.4% and less than 50%, respectively, were collected and small RNAs isolated from these samples were subjected to deep sequencing using the Illumina platform. Six miRNAs were found to be differentially expressed between D1PO and D14PO eggs. GO analysis of the target genes of the 6 miRNAs that were down-regulated in D14PO eggs revealed significantly enriched GO terms that are related to stress response, cell death, DNA damage, ATP generation, signal transduction and transcription regulation.

ORGANISM(S): Oncorhynchus mykiss

PROVIDER: GSE65990 | GEO | 2015/02/18

SECONDARY ACCESSION(S): PRJNA275644

REPOSITORIES: GEO

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Project description:Molecular profiling of the eggs is an excellent approach aiming at understanding biological processes and mechanisms conditioning developmental competence in finfishes and, consequently, reproductive fitness. Despite many efforts, it is still unclear what is the specific role of transcriptome and proteome in determination of egg quality in Teleostei fishes. The aim of this study was to perform integrated transcriptomic-proteomic analysis of eggs of pikeperch – a commercially relevant freshwater fish species. Additionally, comparative analysis of transcriptome and proteome in eggs characterized by either high or low egg quality has been performed, in order to identify mechanisms leading to early embryonic lethality in pikeperch. Our study provides a novel insight into the understanding of the role of maternally-derived molecular cargo in finfishes. The data obtained sheds light on the importance of transcriptome in development of nervous system suggesting neurogenesis-related mRNAs as a very important, non-genetic inheritance factor. Proteomic analysis highlights specific role of proteins in the immune response in ovulated eggs. Integrated analysis brings attention to the galactose-specific lectin nattectin gene and protein as the frontline defense molecule for the egg and developing embryo. The molecular analysis of egg developmental competence emphasizes post-vitellogenic processes (final oocyte maturation and ovulation) as the ones potentially compromising transcriptomic profile, but not affecting proteomic cargo. It highlights the need for careful reconsideration of the commercial reproductive protocols as the very strong modulators of egg quality and their molecular profile. Considering the mechanisms driving these alterations as well as consequences stemming from the differential abundance of the transcripts are still to be explored, the candidate quality markers, first time provided for pikeperch along with the current study, are creating valuable resource for further studies.

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MicroRNA expression profiles from eggs of different qualities associated with post-ovulatory ageing in rainbow trout

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