Integrated chromatin accessibility and DNA methylation analysis to reveal the critical epigenetic modification and regulatory mechanism in gonadal differentiation of the sequentially hermaphroditic fish, Monopterus albus

Biology of Sex Differences

Research

Zitong Lian¹  Xueping Xia¹  Haifeng Tian¹  Qiaomu Hu¹  Zhong Li¹ 

[1] Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wudayuan First Road 8, 430223, Wuhan, China;

关键词: Sex reversal;    Monopterus albus;    DNA methylation;    Chromatin accessibility;    Epigenetic modification;   

DOI  :  10.1186/s13293-022-00484-6

 received in 2022-10-04, accepted in 2022-12-11,  发布年份 2022

来源: Springer

【 摘 要 】

BackgroundMonopterus albus is a hermaphroditic and economically farmed fish that undergoes sex reversal from ovary to testis via ovotestis during gonadal development. The epigenetic changes that are associated with gonadal development in this species remain unclear.MethodsWe produced DNA methylome, transcriptome, and chromatin accessibility maps of the key stages of gonad development: ovary, ovotestis, and testis. The expression of the key candidate genes was detected using qRT-PCR and in situ hybridization and the methylation levels were analysed using bisulphite sequencing PCR. Promoter activity and regulation were assessed using dual-luciferase reporter assays.ResultsGonadal development exhibits highly dynamic transcriptomic, DNA methylation, and chromatin accessibility changes. We found that DNA methylation status, especially of the transcription start site, was significantly negatively correlated with gene expression while chromatin accessibility exhibited no correlation with gene expression during gonadal development. The epigenetic signatures revealed many novel regulatory elements and genes involved in sex reversal, which were validated. DNA methylation detection and site mutation of plastin-2 promoter, as a candidate gene, revealed that DNA methylation could impact the binding of transcription factor dmrt1 and foxl2 through methylation and demethylation to regulate plastin-2 expression during gonadal development.ConclusionsThese data provide novel insights into epigenetic modification and help elucidate the potential molecular mechanism by which dynamic modification of DNA methylation plays a crucial role in gonadal development.

【 授权许可】

CC BY   
© The Author(s) 2022

【 图 表 】

12888_2022_4365_Article_IEq1.gif

12982_2022_119_Article_IEq87.gif

Fig. 1

Fig. 4

Fig. 1

12982_2022_119_Article_IEq81.gif

12982_2022_119_Article_IEq216.gif

12982_2022_119_Article_IEq73.gif