The Potential Role of Deubiquitinating Enzymes (DUBs) in Male Fertility

Review surveys mouse knockout evidence linking ubiquitin-editing enzymes to spermatogenic failure; no human clinical data

Journal: Biomolecules | Published: 2026-02-13 | Type: Review | PMID: 41750367 Authors: Kim Jung Min (Department of Pharmacology, Chonnam National University Medical School, Republic of Korea) Funding/COI: Funded by Korea Ministry of Education. Author declares no competing financial interests.

Summary

Deubiquitinating enzymes (DUBs) remove ubiquitin tags from proteins, reversing the signal that marks them for degradation or functional change. This single-author review consolidates evidence — mostly from mouse loss-of-function models — that several DUBs are required for normal spermatogenesis, and that mutations in DUB genes have turned up in men with spermatogenic failure. No mechanisms are confirmed; the review's own conclusion admits "the exact molecular function" remains to be identified.

Claims

• Loss-of-function mouse models have implicated multiple DUBs in spermatogenesis regulation
• Specific genetic variants in DUB genes have been associated with spermatogenic failure and male infertility in humans
• DUBs regulate upstream processes critical to sperm production: cell cycle progression, apoptosis, DNA repair, and chromatin remodeling
• The review argues DUBs represent potential targets for future diagnostic tools and treatments for male infertility

Study Quality

This is a narrative review, not an original study — no new data are presented, no meta-analytic methods are described, and no systematic search protocol is reported. The strength of the underlying evidence varies: mouse knockout models provide mechanistic proof-of-concept but are notoriously poor translators to human fertility outcomes. Human genetic association data referenced in the review is sparse and drawn from small cohort studies; the abstract gives no sample sizes, effect sizes, or p-values for any of these associations.

Single-author reviews carry an inherent risk of selective citation. Without a declared co-reviewer or systematic methodology, the comprehensiveness of the literature survey cannot be verified.

Red Flags

• No new data — purely a narrative review with no systematic methods
• Single author; no co-reviewer or search methodology disclosed
• Nearly all mechanistic evidence is from mouse models; human translation is undemonstrated
• The paper's own conclusions acknowledge mechanisms are "still under investigation" and exact molecular targets remain unknown
• No specific numbers anywhere in the abstract or conclusions section — no effect sizes, no variant frequencies, no sample sizes cited
• Title uses "potential role," flagging the speculative nature of the therapeutic claims

Strengths

• No industry funding; Ministry of Education grant is low-conflict
• No competing interests declared
• Synthesizes a molecular biology area (DUB biology) that has genuine mechanistic plausibility
• Identifies a specific gene class for future targeted research rather than vague pathway claims

Verdict

This review maps out an interesting molecular territory — there is real mouse-model evidence that ubiquitin editing matters for sperm production — but it contributes no new data and cannot move the clinical needle. The absence of any quantitative human evidence, combined with single-author narrative methods and relentlessly hedged language ("potential," "may influence," "still under investigation"), puts this firmly in the category of hypothesis-generating background literature. Worth reading if you're designing a spermatogenesis genetics study; not worth citing as evidence that DUBs cause human infertility.