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Updated: Mar 29, 2026
Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
Published on: December 30, 2014
Post-transcriptional Wnt Signaling Governs Epididymal Sperm Maturation
Stefan Koch1, Sergio P Acebron1, Jessica Herbst1
1Division of Molecular Embryology, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany.
Abstract:
The canonical Wnt signaling pathway is of paramount importance in development and disease. An emergent question is whether the upstream cascade of the canonical Wnt pathway has physiologically relevant roles beyond β-catenin-mediated transcription, which is difficult to study due to the pervasive role of this protein. Here, we show that transcriptionally silent spermatozoa respond to Wnt signals released from the epididymis and that mice mutant for the Wnt regulator Cyclin Y-like 1 are male sterile due to immotile and malformed spermatozoa. Post-transcriptional Wnt signaling impacts spermatozoa through GSK3 by (1) reducing global protein poly-ubiquitination to maintain protein homeostasis; (2) inhibiting septin 4 phosphorylation to establish a membrane diffusion barrier in the sperm tail; and (3) inhibiting protein phosphatase 1 to initiate sperm motility. The results indicate that Wnt signaling orchestrates a rich post-transcriptional sperm maturation program and invite revisiting transcription-independent Wnt signaling in somatic cells as well.
Insights
Wnt signaling regulates sperm maturation independently of transcription. Mutant mice lacking Cyclin Y-like 1 exhibit male sterility due to impaired sperm function, highlighting Wnt
Area of Science:
- Reproductive biology and developmental signaling.
- Molecular mechanisms of sperm maturation.
- Cellular roles of Wnt signaling pathway.
Background:
- The canonical Wnt signaling pathway is crucial in development and disease.
- Its role beyond β-catenin-mediated transcription is poorly understood.
- Investigating transcription-independent Wnt signaling is challenging due to β-catenin's pervasive role.
Purpose of the Study:
- To explore non-transcriptional roles of the Wnt signaling pathway.
- To investigate the impact of Wnt signaling on sperm maturation.
- To identify the function of Wnt regulators like Cyclin Y-like 1 in male fertility.
Main Methods:
- Analysis of Wnt signaling in transcriptionally silent spermatozoa.
- Generation and study of mice mutant for Cyclin Y-like 1.
- Investigation of post-transcriptional Wnt signaling effects via GSK3 inhibition.
Main Results:
- Spermatozoa respond to epididymal Wnt signals.
- Mice lacking Cyclin Y-like 1 display male sterility with immotile, malformed spermatozoa.
- Post-transcriptional Wnt signaling affects sperm homeostasis, membrane barrier formation, and motility initiation.
Conclusions:
- Wnt signaling orchestrates a significant post-transcriptional sperm maturation program.
- Transcription-independent Wnt signaling plays a vital role in male fertility.
- Findings suggest re-evaluation of non-transcriptional Wnt signaling in somatic cells.
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