A conserved Piezo–mRPL2/Jun axis controls reproduction via mitochondrial bioenergetics

Piezo channels are essential mechanosensors, but their roles in reproduction remain poorly understood. Here, we identify a critical function for BmPiezo in silkworm fertility and embryonic diapause, mediated through a conserved downstream regulatory axis. CRISPR/Cas9-mediated knockout of BmPiezo resulted in male sterility and loss of embryonic diapause, accompanied by dysregulation of ribosome-associated genes and oxidative phosphorylation, and reduced ATP production. We identified mitochondrial ribosomal protein L2 (BmmRPL2) and transcription factor BmJun as key downstream effectors, required for spermatogenesis and diapause, respectively. Homozygous disruption of either gene caused embryonic lethality. Cross-species expression analysis revealed strong expression of Piezo2 and mRPL2 in early human spermatids. Remarkably, transgenic expression of murine Piezo2 in BmPiezo-/-silkworms reactivated the Piezo-mRPL2/Jun axis, restored ATP levels, and rescued reproductive defects. These findings define a conserved pathway that connects mechanical sensing to mitochondrial bioenergetics in reproductive regulation, advancing our understanding of fertility mechanisms across species.