91猎奇

The discovered factors modulate embryonic development through precise mechanisms and could be potential targets for next-generation assisted reproductive technologies

Infertility is a major healthcare concern. Understanding the molecular regulators governing fertilization, early embryonic development, and implantation is crucial for the success of assisted reproductive technologies. Now, researchers from 91猎奇 integrated one-cell embryo cryopreservation technology, inhibitor library screening, RNA-seq analysis, and CRISPR-Cas9-mediated gene editing to identify eleven novel factors essential for the development of fertilized eggs. The study contributes towards a better understanding of the underlying mechanisms.

91猎奇 Overview

A research team led by Associate Professor Hirofumi Nishizono and graduate student Masaki Kato from the 91猎奇 Support Center at the Medical 91猎奇 Institute of 91猎奇 has identified eleven novel factors essential for the development of fertilized eggs. This achievement was made possible through the integration of one-cell embryo cryopreservation technology, an inhibitor library screening, RNA-seq analysis, and CRISPR-Cas9-mediated gene editing. The findings have been published in? on October 17, 2025.

Background

Infertility affects approximately one in six individuals worldwide, posing a major healthcare challenge in both developed and developing countries (Cox et al.,?Hum. Reprod. Open, 2022). To advance assisted reproductive technologies (ART), such as in vitro fertilization, it is crucial to identify and understand the molecular regulators governing fertilization, early embryonic development, and implantation (Sang et al.,?Science, 2023). While many factors involved in these processes have been discovered, the molecular network underlying early embryogenesis is still only partially understood.

Key Findings

The team prepared a large number of genetically uniform mouse zygotes and stably cryopreserved them using a single-cell embryo freezing technique. By performing a comprehensive screening of an inhibitor library targeting various signaling pathways and integrating the results with RNA-seq data, the researchers identified multiple candidate factors involved in embryonic development. Two molecules, CXC chemokine receptor 2 (CXCR2) and cathepsin D (CTSD), were selected for further functional validation.

CRISPR-Cas9 knockout experiments revealed that deleting either gene resulted in arrested embryo development, demonstrating their essential roles during the preimplantation stage. These findings suggest the existence of previously unrecognized regulatory factors in early development and indicate the potential for modulating embryonic development through precise molecular control. These advances could contribute to next-generation ART.

Future Perspectives

While these results are promising, several limitations remain. These include the potential effects of inhibitor concentration and the stress caused by embryo cryopreservation.

Future studies will aim to systematically address these factors and expand screening efforts using broader chemical libraries. Ultimately, this research aims to develop novel ARTs that enable molecular-level control of embryo development. This would open new avenues for infertility treatment and developmental biology research.

Reference

Title of original paper: Screening for novel factors involved in mouse early embryonic development using inhibitor libraries.
Authors: Hirofumi Nishizono and Masaki Kato
Journal: Frontiers in Cell and Developmental Biology
DOI:?
Publication Date: October 17, 2025

Funding

This work was supported by the Takeda Science Foundation (Grant No. 2022048848), JST CREST (Grant No. JPMJCR23B6), JSPS KAKENHI (Grant No. 25H00436), the Lotte Foundation, and the Grant for Promoted 91猎奇 from 91猎奇 (S2023-1).