Long Non-Coding RNAs in Fish Reproduction: Emerging Regulators from Gonadal Fate to Fertility
Abstract
Long non-coding RNAs (lncRNAs) have emerged as important regulators of gene expression acting through transcriptional, post-transcriptional, and epigenetic mechanisms. In teleosts, high-throughput sequencing has identified a growing number of lncRNAs associated with gonadal development and reproductive function, yet current knowledge remains fragmented across species and reproductive contexts. This review summarizes recent progress in understanding lncRNA-mediated regulation of fish reproduction, with emphasis on gametogenesis and germ cell development, gonadal maturation, steroidogenesis, sex determination and differentiation, sex reversal, sexual dimorphism, and fertility. Evidence from transcriptomic and functional studies indicates that lncRNAs are involved in complex regulatory networks through cis- and trans-acting effects, competing endogenous RNA (ceRNA) interactions, and hormone-responsive pathways. Several lncRNAs have been associated with key reproductive genes, including gsdf, dmrt1, amhr2, ccne1, and cyp19a1, underscoring their potential roles in gonadal development and reproductive performance. Despite these advances, most reported lncRNAs remain functionally uncharacterized, limiting a full understanding of their biological significance. Future studies that integrate transcriptomics, genome editing, and mechanistic validation will be essential to define the precise functions of those lncRNAs. Overall, current evidence supports lncRNAs as emerging regulatory components of teleost reproductive biology with potential relevance to aquaculture, reproductive biotechnology, and environmental research.
