Genetic Mechanisms and Molecular Regulation of Sperm Motility

Spermatozoon motility emerges from a complex interplay between inherited genetic programmes and dynamic molecular processes that govern flagellar structure, energy supply and signalling cascades. Core structural components of the flagellum—axonemal microtubules, dynein motor proteins and radial spokes—are encoded by a suite of genes whose mutations can lead to immotile-ciliary syndromes. Beyond the structural blueprint, the fine-tuning of motility relies on transcriptional and post-transcriptional regulation of energy-metabolism enzymes, ion channels and signalling proteins. Mitochondrial ATP generation supplies the mechanical force required for dynein-driven microtubule sliding, while calcium- and cyclic AMP-mediated pathways regulate beat frequency and amplitude. Recent genetic studies have uncovered variants in ion-channel genes, signalling kinases and regulatory RNAs—both microRNAs and long non-coding RNAs—that modulate gene expression networks in the testes and epididymis. Complementary phosphoproteomic and metabolomic analyses have elucidated how reversible phosphorylation and metabolic fluxes orchestrate the acquisition of progressive motility during epididymal transit. Together, these insights are driving a more integrated understanding of how inherited factors and local molecular signals converge to ensure optimal sperm function, with broad implications for animal breeding, conservation and clinical interventions in male infertility.

Research from Nature Portfolio

Recent transcriptomic analyses using RNA sequencing in avian models have provided a genome-wide characterisation of long non-coding RNAs and mRNAs associated with motility phenotypes. In one foundational study, profiling of testicular tissue revealed over two thousand lncRNAs—including intergenic, anti-sense and intronic species—of which a subset displayed differential expression between high- and low-motility groups. Functional annotation of co-expressed mRNAs highlighted roles in ATP binding, cilium assembly and redox processes, and integrative network analysis yielded candidate lncRNA–mRNA regulatory pairs poised to influence dynein arm assembly and energy metabolism in flagellar axonemes. These findings established a comprehensive resource for mechanistic follow-up on RNA-based regulation of sperm motility.

Genetic Mechanisms and Molecular Regulation of Sperm Motility publication trend

The graph below shows the total number of articles in genetic mechanisms and molecular regulation of sperm motility across all publications each year (not limited to Nature Index journals).

Technical terms

Axoneme: Core microtubule scaffold of the flagellum arranged in a 9+2 pattern, housing dynein motors that drive bending.

Dynein arms: ATP-dependent motor protein complexes attached to axonemal microtubules, generating the sliding motion of adjacent doublets.

Long non-coding RNA (lncRNA): Transcripts longer than 200 nucleotides that are not translated but can regulate gene expression at multiple levels.

MicroRNA (miRNA): Small (~22 nt) non-coding RNAs that bind target mRNAs to repress translation or induce degradation.

Capacitation: Biochemical and physiological changes acquired in the epididymis and female tract that render sperm capable of fertilisation.

Phosphorylation: Reversible addition of phosphate groups to proteins, altering function, localisation or interaction networks.

References

1. Analyses of Long Non-Coding RNA and mRNA profiling using RNA sequencing in chicken testis with extreme sperm motility. Scientific Reports (2017).
2. Association between Yili goose sperm motility and expression profiles of mRNA and miRNA in testis. BMC Genomics (2023).
3. Influence of the Season and Region Factor on Phosphoproteome of Stallion Epididymal Sperm. Animals (2021).
4. In Silico Identification of lncRNAs Regulating Sperm Motility in the Turkey (Meleagris gallopavo L.). International Journal of Molecular Sciences (2022).