# Condensate-forming eIF4ET ensures adequate levels of meiotic proteins to support oocyte storage

## TL;DR

This study shows how a protein called eIF4ET helps oocytes stay healthy during long-term storage by maintaining necessary protein levels.

## Contribution

The study reveals a new role for eIF4ET in forming condensates that preserve oocyte proteomes during storage.

## Key findings

- IFET-1 forms condensates with CAR-1 in stored oocytes, which dissolve upon activation.
- Depleting IFET-1 disrupts microtubule maintenance and meiotic spindle assembly in oocytes.
- eIF4ET dysfunction may contribute to aneuploidy and age-related infertility.

## Abstract

Bhatia et al use female nematodes to reveal how the conserved eIF4E-transporter protein (eIF4ET) plays an unexpected role in promoting translation of cytoskeletal proteins to support days-long storage of arrested oocytes.

Animals store oocytes in a dormant state for weeks to decades before ovulation. The homeostatic programs that oocytes use to endure long-term storage are poorly understood. Using female nematodes as a short-lived model, we found that oocyte formation and storage required IFET-1, the conserved eIF4E-transporter protein (eIF4ET). IFET-1 co-assembled with CAR-1 (Lsm14) to form micron-scale condensates in stored oocytes, which dissipated after oocyte activation. Depletion of IFET-1 destabilized the stored oocyte proteome, leading to lower translation, a decline in microtubule maintenance proteins, and errors in microtubule organization and meiotic spindle assembly. Deleting domains within IFET-1 impaired oocyte storage without affecting oocyte formation. Thus, in addition to establishing a healthy oocyte reserve in young mothers, IFET-1 ensures that correct levels of cytoskeletal proteins are maintained as oocytes age. eIF4ET also localized to micron-scale puncta in dormant human oocytes. Our results clarify how eIF4ET maintains the oocyte reserve and further support eIF4ET dysfunction as an upstream cause of embryonic aneuploidy and age-related infertility.