# Obox1 deficiency impairs fertility in female mice

## TL;DR

Obox1 deficiency in female mice leads to reduced fertility due to impaired ovulation and hormonal imbalances.

## Contribution

This study reveals Obox1's role in regulating ovarian function and hormone balance through paracrine signaling.

## Key findings

- Obox1 knockout mice show reduced litter size and impaired ovulation.
- Obox1 deficiency causes decreased gonadotropins and sex hormones, especially LH.
- Obox1 regulates oocyte-granulosa cell interactions and steroid hormone synthesis.

## Abstract

•Obox1 deficiency result in reduced litter size and impaired oocyte ovulation.•Female mice lacking Obox1 exhibit decreased levels of gonadotropins and sex hormones.•Superovulated Obox1 knockout mice display an increased incidence of unruptured follicles.•Obox1 may regulate ovarian somatic function through paracrine mechanism.

Obox1 deficiency result in reduced litter size and impaired oocyte ovulation.

Female mice lacking Obox1 exhibit decreased levels of gonadotropins and sex hormones.

Superovulated Obox1 knockout mice display an increased incidence of unruptured follicles.

Obox1 may regulate ovarian somatic function through paracrine mechanism.

OBOX1 is a maternal factor involved in oogenesis and follicle development, yet its specific role remains unclear. Here, we demonstrated that Obox1 knockout female mice exhibit subfertility, characterized by reduced litter size and impaired ovulation. These oocytes show minimal disruption in early embryonic development post-fertilization. However, Obox1 deficiency leads to decreased levels of gonadotropins and female sex hormones, especially the luteinizing hormone (LH). Exogenous human chorionic gonadotropin (hCG) administration during superovulation failed to rescue the ovulation defect. Post-ovulation, the ovulation-related genes and serum progesterone levels were significantly reduced in Obox1-deficienct ovaries, accompanied by dysregulated steroidogenesis-related gene expression. Transcriptomic profiling of Obox1 deficient metaphase II (MII) oocytes revealed downregulation of genes involved in mitochondrial energy metabolism and biosynthesis, and upregulation of genes associated with cell transport, transcription, RNA processing, translation. Further investigation revealed that follistatin gene expression was upregulated in both MII oocytes and ovaries of Obox1 deficient mice, along with increased expression of Gdf9, Bmp15, Foxl2, and NOTCH signaling components. These findings suggest that Obox1 is essential for maintaining hormonal balance and ovulatory function through regulating oocyte-granulosa cell interactions and steroid hormone synthesis.

Image, graphical abstract