Slirp2 modulates oogenesis via regulating mitochondrial protein translation

Area of Science:

• Cell Biology
• Genetics
• Developmental Biology

Background:

• Mitochondria generate ATP via oxidative phosphorylation (OXPHOS) and rely on nuclear-encoded proteins.
• Mutations in nuclear-encoded mitochondrial proteins cause diseases; SLIRP mutations are linked to human mitochondrial disorders.
• SLIRP's in vivo function is poorly understood, despite its role in mitochondrial mRNA stability and translation.

Purpose of the Study:

• Investigate the in vivo role of Drosophila Slirp2 in oogenesis.
• Elucidate the mechanisms by which Slirp2 impacts mitochondrial function and reproductive health.

Main Methods:

• Utilized Drosophila melanogaster as a model organism to study Slirp2 function in oogenesis.
• Assessed mitochondrial protein synthesis, OXPHOS efficiency, ATP production, and insulin/mTOR signaling in Slirp2 loss-of-function models.
• Analyzed the impact of Slirp2 on reactive oxygen species levels and programmed cell death.

Main Results:

• Loss of Slirp2 impairs mitochondrial protein synthesis, reduces OXPHOS efficiency, and diminishes ATP production.
• Slirp2 deficiency disrupts insulin/mTOR signaling and increases reactive oxygen species, inducing programmed cell death.
• Slirp2 loss-of-function leads to infertility in female flies, highlighting its critical role in oogenesis.

Conclusions:

• Slirp2 is essential for mitochondrial function, protein synthesis, and ATP production during oogenesis in vivo.
• Slirp2 plays a vital role in maintaining reproductive health by preventing oxidative stress-induced cell death.
• Slirp2 exhibits species-specific regulation of mitochondrial translation, with implications for understanding the variable effects of SLIRP mutations in different organisms and tissues.