ArticleJournal of endocrinological investigation2025
Impact of mild traumatic brain injury (mTBI) on sperm genome integrity: insights from a mouse model.
Article in Journal of endocrinological investigation, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeTraumatic Brain Injury (TBI) poses a significant global health burden, with Mild TBI (mTBI) being the most prevalent form. TBI triggers activation of the hypothalamic-pituitary-adrenal (HPA) axis, which in turn affects the hypothalamic-pituitary-gonadal (HPG) axis regulating oogenesis and spermatogenesis. In this study, we investigated the impact of mTBI on sperm genome integrity using a repetitive mTBI (r-mTBI) mouse model.
methodsWe assessed sperm telomere length (TL), free TERRA (fTERRA), and DNA/RNA hybrid TERRA (hTERRA) levels, alongside transcriptional changes in genes involved in TERRA regulation and DNA damage response.
resultsOur findings reveal that a single mTBI event leads to a significant reduction in sperm TL during the acute phase, followed by an increase in TL during the chronic phase of r-mTBI, reminiscent of aging-associated changes. Moreover, we observed alterations in the transcription levels of Rad51, Exo1, Rb1, RNaseH1, and RNaseH2 genes, particularly in association with fTERRA and hTERRA levels, following mTBI.
conclusionUnderstanding the potential non-Mendelian effects of TBI holds promise for elucidating TBI pathogenesis, mechanisms of TBI-induced diseases, and conditions of unknown etiology. Given the risks associated with repeated TBI exposure, especially in sports like football and boxing, consideration of potential paternal transmission of effects to offspring is crucial.
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