Primary Ovarian Insufficiency Induced by Fanconi Anemia E Mutation in a Mouse Model
Chun Fu1,2, Khurshida Begum2, Paul A Overbeek2
1Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
Abstract:
In most cases of primary ovarian insufficiency (POI), the cause of the depletion of ovarian follicles is unknown. Fanconi anemia (FA) proteins are known to play important roles in follicular development. Using random insertional mutagenesis with a lentiviral transgene, we identified a family with reduced fertility in the homozygous transgenic mice. We identified the integration site and found that the lentivirus had integrated into intron 8 of the Fanconi E gene (Fance). By RT-PCR and in situ hybridization, we found that Fance transcript levels were significantly reduced. The Fance homozygous mutant mice were assayed for changes in ovarian development, follicle numbers and estrous cycle. Ovarian dysplasias and a severe lack of follicles were seen in the mutant mice. In addition, the estrous cycle was disrupted in adult females. Our results suggest that POI has been induced by the Fance mutation in this new mouse model.
Insights
A new mouse model reveals Fanconi anemia E gene (Fance) mutations cause primary ovarian insufficiency (POI) by depleting ovarian follicles. This finding sheds light on the unknown causes of POI.
Area of Science:
- Reproductive biology
- Genetics
- Developmental biology
Background:
- The etiology of primary ovarian insufficiency (POI) remains largely unknown in most cases.
- Fanconi anemia (FA) proteins are critical for normal ovarian follicular development.
- Understanding genetic factors contributing to POI is crucial for reproductive health research.
Purpose of the Study:
- To investigate the role of Fanconi anemia E gene (Fance) in ovarian function.
- To establish and characterize a novel mouse model for primary ovarian insufficiency (POI).
Main Methods:
- Random insertional mutagenesis using a lentiviral transgene in mice.
- Identification of the lentivirus integration site within the Fance gene.
- Quantitative assessment of Fance transcript levels via RT-PCR and in situ hybridization.
- Analysis of ovarian development, follicle count, and estrous cycle in Fance homozygous mutant mice.
Main Results:
- Homozygous transgenic mice exhibited reduced fertility.
- Lentiviral integration into the Fance gene intron 8 led to significantly reduced Fance transcript levels.
- Fance mutant mice displayed ovarian dysplasias and a severe depletion of ovarian follicles.
- Disrupted estrous cycles were observed in adult female Fance mutant mice.
Conclusions:
- A novel mouse model for primary ovarian insufficiency (POI) has been successfully generated.
- Fance gene mutation is implicated as a causative factor in POI due to ovarian follicle depletion.
- This study highlights the critical role of Fance in maintaining ovarian health and function.
