Publications by authors named "Clothilde Berthelin"

Article Synopsis
  • * The study focused on the transition to androgenesis in freshwater Corbicula clams, where males clone themselves using female resources, and examined how this process affects spermatogenesis in different clam species.
  • * Results showed that C. japonica undergoes conventional meiosis, while C. sp. form A/R does not exhibit reduced sperm stages, indicating a modification in reproductive strategy; interestingly, C. sandai produced unreduced sperm, suggesting it may have a role in the emergence of androgenesis.
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Pesticides threat marine organisms worldwide. Among them, the Pacific oyster is a bivalve mollusc model in marine ecotoxicology. A large body of literature already stated on the multiple-scale effects pesticides can trigger in the Pacific oyster, throughout its life cycle and in a delayed manner.

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The following paper gives a detailed description of the oogenesis cycle for the European Plaice (), from oogonia to post-ovulatory follicle, including ovarian follicle and sizes. Noteworthy particularities were the difficulty in identifying cortical alveoli due to their very small size. Quantitative histology (stereology) on histological slides was used to determine a first size at maturity for females from the English Channel, which was found to be smaller compared to the literature (19 cm).

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The Mytilus mussels are spread all over the world and many related species coexist in several areas and can produce hybrid offspring. Mussels have been used for decades in national and international programs to monitor chemical contamination in the environment. Differences in bioaccumulation and biotransformation abilities between species and their hybrids should be evaluated to assess the comparability of the results obtained within the international biomonitoring programs.

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In bilaterian species, the amino acid sequence conservation between Insulin related peptides is relatively low except for the cysteine residues involved in the disulphide bonds. In the A chain, the conserved cystein residues are included in a signature motif. Investigating the variations in this motif would give insight into the phylogenetic history of the family.

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Article Synopsis
  • The study investigates sperm maturation in the Pacific oyster *Crassostrea gigas*, focusing on proteins associated with spermatozoa through a 2-DE proteomic approach.
  • Researchers identified 31 proteins that differ between mature and less mature germ cells, with specific proteins linked to flagellum formation and energy production in mature sperm.
  • The findings enhance understanding of sperm maturation and could improve practices in mollusk hatcheries.
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