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Insights into Solea senegalensis Reproduction Through Gonadal Tissue Methylation Analysis and Transcriptomic
Daniel Ramírez1, Marco Anaya-Romero1, María Esther Rodríguez1
1Área de Genética, Facultad de Ciencias del Mar y Ambientales, INMAR, Universidad de Cádiz, 11510 Cádiz, Spain.
Biomolecules
|January 25, 2025
Summary
DNA methylation patterns influence gene expression and sex differentiation in fish. This study reveals epigenetic regulation impacts reproduction in Senegalese sole (S. senegalensis) aquaculture, crucial for genetic improvement.
Area of Science:
- Epigenetics and Molecular Biology
- Aquaculture and Reproductive Biology
- Genomics and Transcriptomics
Background:
- Captive breeding of Senegalese sole (S. senegalensis) faces reproductive challenges, particularly in males, impacting genetic improvement.
- Environmental factors and internal influences regulate sex determination and differentiation in fish through DNA methylation.
- Epigenetic modifications, specifically DNA methylation, are critical for gene expression regulation.
Purpose of the Study:
- To investigate DNA methylation patterns and transcriptomic profiles in Senegalese sole gonadal tissues.
- To understand the role of epigenetic regulation in gene expression related to reproduction and sex differentiation.
- To identify variations in methylation due to rearing conditions and sexual maturity.
Main Methods:
- Reduced Representation Bisulfite Sequencing (RRBS) for detecting DNA methylation variations.
- RNA sequencing for differential gene expression analysis.
- Analysis of gonadal tissue from S. senegalensis groups with differing rearing conditions and maturity stages.
Main Results:
- DNA methylation significantly regulates gene expression, with context-dependent repressive or enhancing effects.
- CpG methylation levels and correlation rates varied near reproduction-linked genes.
- Differential methylation was most pronounced between maturation stages, followed by rearing conditions, and then sexes.
Conclusions:
- DNA methylation plays a crucial role in regulating gene expression in fish reproduction.
- Epigenetic modifications are integral to sex differentiation processes in S. senegalensis.
- The study highlights the intricate relationship between epigenetic modifications, gene expression, and reproductive success in aquaculture.
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