Research Insights: The Role of the TEX43 Gene in Spermatogenesis

Recent research highlights the TEX43 gene fertility implications, focusing on its role in sperm development. Many testis-specific genes are essential for male reproduction. However, the exact function of TEX43 remained largely uncharacterized until this comprehensive investigation. By exploring both animal models and clinical data, scientists have clarified the biological importance of this gene.

Clinical Significance of TEX43 Gene Fertility

Researchers utilized CRISPR/Cas9 technology to create Tex43 knockout (KO) mouse models. These models allowed for a detailed examination of testicular histology and sperm parameters. Interestingly, the mice remained fertile despite a modest reduction in sperm density. This finding suggests that while the gene is testis-enriched, it is not essential for conception in murine models.

Furthermore, scientists analyzed clinical data from 146 infertile men through whole-exome sequencing. They identified a rare biallelic variant, p.Val320Leu, in one patient with asthenoteratozoospermia. However, pedigree analysis and structural modeling indicated that the mutant protein's stability remained intact. This observation aligns with the mouse data, suggesting that TEX43 variants may not be the primary driver of infertility in humans.

Microtubule Localization and Function

Techniques such as immunohistochemistry and western blotting confirmed that TEX43 localizes to the flagellar microtubules of sperm. This specific localization points toward a role in maintaining the structural integrity of the sperm tail. Despite its presence in the flagella, the absence of TEX43 did not significantly alter sperm motility or morphology in the tested models. Moreover, in vitro fertilization (IVF) assays showed normal results for the knockout sperm cells.

Consequently, the study concludes that TEX43 exerts a minimal impact on overall fertility. This information is vital for genetic counseling and the management of male factor infertility. Clinicians should interpret TEX43 variants with caution, as they might represent benign polymorphisms rather than pathogenic mutations in certain populations.

Frequently Asked Questions

Is the TEX43 gene essential for male fertility?

Research indicates that the TEX43 gene has a minimal impact on fertility. Both mice and humans with TEX43 variants or deficiencies showed preserved reproductive capacity despite minor changes in sperm density.

Where does the TEX43 protein reside in sperm cells?

The TEX43 protein is specifically found on the flagellar microtubules within the sperm tail, where it associates with the axonemal structure to potentially support flagellar stability.

Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.

References

• Chen QQ et al. TEX43, a testis-enriched microtubule-associated gene, exerts minimal impact on spermatogenesis and fertility in mice and humans. J Assist Reprod Genet. 2026 May 23. doi: 10.1007/s10815-026-03911-4. PMID: 42174372.


• Bellil H, et al. Human testis-expressed (TEX) genes: a review focused on spermatogenesis and male fertility. Basic Clin Androl. 2021 Apr 22;31(1):9. doi: 10.1186/s12610-021-00127-7. PMID: 33882832.


• Yin H, et al. Essential role of CFAP77-CCDC105-TEX43 subcomplex in connecting axonemal A and B tubules for mammalian sperm motility. bioRxiv [Preprint]. 2025 Feb 25. doi: 10.1101/2025.02.23.639767.