AI Article Synopsis

  • The study aimed to assess how seasonal changes impact the metabolomic profile of ovarian follicles in Italian Mediterranean buffalo, particularly during the non-breeding season (NBS) when oocyte competence is lower.
  • Various components like follicular fluid, cells, and oocytes were analyzed using 1H Nuclear Magnetic Resonance, revealing distinct seasonal differences in metabolite content.
  • The findings highlighted key metabolites linked to reduced oocyte competence, suggesting potential markers for improving oocyte quality during the NBS and informing strategies to enhance the in-vitro maturation (IVM) environment.

Article Abstract

The aim of this work was to evaluate the seasonal effect on the metabolomic profile of the ovarian follicle in Italian Mediterranean buffalo to unravel the causes of the reduced competence during the non-breeding season (NBS). Samples of follicular fluid, follicular cells, cumulus cells and oocytes were collected from abattoir-derived ovaries during breeding season (BS) and NBS and analyzed by 1H Nuclear Magnetic Resonance. The Orthogonal Projections to Latent Structures of the Discriminant Analysis showed clear separation into seasonal classes and Variable Importance in Projection method identified differentially abundant metabolites between seasons. Seasonal differences were recorded in metabolite content in all analyzed components suggesting that the decreased oocyte competence during NBS may be linked to alteration of several metabolic pathways. The pathway enrichment analysis revealed that differences in the metabolites between the seasons were linked to glutathione, energy generating and amino acid metabolism and phospholipid biosynthesis. The current work allows the identification of potential positive competence markers in the follicular fluid as glutathione, glutamate, lactate and choline, and negative markers like leucine, isoleucine and β-hydroxybutyrate. These results form a major basis to develop potential strategies to optimize the follicular environment and the IVM medium to improve the competence of oocytes during the NBS.

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Source
http://dx.doi.org/10.1016/j.theriogenology.2023.02.022DOI Listing

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