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<p><i>Collichthys lucidus</i> is an economically important marine fish, which is widely distributed across tropical, subtropical, and temperate climatic zones. However, adaptations to different environments from an epigenetic perspective are poorly understood. In this study, a total of 300&#xa0;Gbp of raw sequencing data was obtained. DNA methylation predominantly occurred at the CpG locus, accounting for over 90% of the total methylation, while the CHG and CHH loci had relatively low methylation percentages of around 5 and 3%, respectively. Additionally, correlation analysis with environmental data from 2018 to 2020 indicated that temperature had the most significant effect on CpG methylation, followed by salinity. By comparing northern (Tianjin) and southern (Zhanjiang) populations, 647 genes with significant promoter methylation differences were found, enriched in stress-response pathways. Seven genes in the MAPK pathway stood out. Their methylation may relate to <i>C. lucidus</i> long-term temperature and salinity adaptation, offering a theoretical basis for teleost epigenetic adaptation studies.</p>

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Adaptation-linked epigenetic variation and DNA methylation landscape across five populations of the marine economic fish Collichthys lucidus (Sciaenidae)

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Li-Hua Jiang,
  • Chang-Zhen Niu,
  • Fan Fan,
  • Xiao-Jun Yan

摘要

Collichthys lucidus is an economically important marine fish, which is widely distributed across tropical, subtropical, and temperate climatic zones. However, adaptations to different environments from an epigenetic perspective are poorly understood. In this study, a total of 300 Gbp of raw sequencing data was obtained. DNA methylation predominantly occurred at the CpG locus, accounting for over 90% of the total methylation, while the CHG and CHH loci had relatively low methylation percentages of around 5 and 3%, respectively. Additionally, correlation analysis with environmental data from 2018 to 2020 indicated that temperature had the most significant effect on CpG methylation, followed by salinity. By comparing northern (Tianjin) and southern (Zhanjiang) populations, 647 genes with significant promoter methylation differences were found, enriched in stress-response pathways. Seven genes in the MAPK pathway stood out. Their methylation may relate to C. lucidus long-term temperature and salinity adaptation, offering a theoretical basis for teleost epigenetic adaptation studies.