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Analysis of microRNAs in bovine early embryonic development

ABSTRACT: In animals, the maternal-to-embryonic transition (MET) is an important step occurring in the first days of early development. This important transition involves the degradation of maternal transcripts that have been stocked during oogenesis and used until this transition. Moreover, some precise and specific control mechanisms must govern the adequate synchronization of the MET events to promote embryonic genome activation. These mechanisms are not well understood, but microRNAs could be one of the mechanisms involved. MicroRNAs are short non-coding RNAs involved in a growing number of pathways by their post-transcriptional repression of mRNA translation. Thus, we analyzed microRNA expression during oocyte maturation by comparing GV-oocytes with MII-oocytes in cow.

ORGANISM(S): Gorilla gorilla Lagothrix Bos taurus Rattus norvegicus Mus musculus Rhinopithecus bieti Pan troglodytes Pan paniscus Canis lupus familiaris Homo sapiens Monodelphis domestica Ovis aries Ateles sp. Macaca nemestrina Cricetulus griseus Saguinus imperator Sus scrofa Lemur catta Pongo abelii Symphalangus syndactylus Macaca mulatta

PROVIDER: GSE35567 | GEO | 2012/02/08

SECONDARY ACCESSION(S): PRJNA152215

REPOSITORIES: GEO

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Project description:Background: Early embryonic development is governed by maternal transcripts stored within the oocyte during oogenesis. Transcriptional activity of the oocyte ultimately dictates its developmental potential and may be influenced by maternal age, resulting in reduced competence of oocytes derived from women of advanced age, compared with the young. In the current study, RNA-Seq was used to perform transcriptome profiling of human GV and MII oocytes derived from young and advanced maternal age women. Participants/Materials and Methods: Cumulus dissection from donated oocytes was performed. GV and MII oocytes underwent deep RNA sequencing using the SMART-Seq v4 Ultra Low Input RNA protocol (Takara-Clontech, USA) and Nextera XT DNA library preparation kit (Illumina, USA). Data processing, quality assessment and bioinformatics analysis were performed using source-software, including FastQC, HISAT2, StringTie, edgeR and DAVID. Results: Following deep single-cell RNA-Seq on GV and MII oocytes, hundreds of transcripts were significantly differentially expressed between young maternal age (YMA) and advanced maternal age (AMA) groups, with the most significant biological processes relating to mitochondrial reserves. The GV to MII transition shares common biological processes between young and AMA groups, however, some genes involved in mitochondria function were altered during ageing. A decrease in mitochondrial-related transcripts was also observed during the GV to MII transition. However, there was a much greater reduction of mitochondrial-related transcripts in MII oocytes of AMA. This observation was confirmed when YMA MII oocytes were compared with the AMA MII group with mitochondrial-related transcripts being significantly higher expressed in the YMA group, including biological processes, such as mitochondrial electron transport and ATP biosynthetic process. These results indicate a higher energy potential in YMA MII oocytes that is decreased with age. Other significantly higher biological processes in the YMA MII group include transcripts involved in the regulation of ubiquitin-dependent degradation. Lack of these transcripts could lead to a non-appropriate removal of oogenesis remnants following fertilisation in the AMA MII group. Discussion: Understanding reproductive ageing effects at the RNA level in human oocytes may reveal differences in the mechanisms regulating the GV to MII transition that impact on oocyte quality in YMA and AMA patients. Further investigations of the up-/down-regulated transcripts during ageing could guide and improved IVF outcomes for AMA patients.

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Analysis of microRNAs in bovine early embryonic development

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