DNA Repair is Efficient in Irradiated M Phase Zygotes

Overview

Journal J Reprod Dev

Specialties Biology
Reproductive Medicine

Date 2024 Apr 21

PMID 38644217

Authors

Yuan Wang

Dai Tsukioka

Shoji Oda

Hiroshi Mitani

Fugaku Aoki

Affiliations

Soon will be listed here.

Abstract

In somatic cells, DNA repair is attenuated during mitosis to prevent the formation of anaphase bridges and facilitate the proper segregation of sister chromatids. Irradiation-induced γH2AX foci persist for hours in M phase somatic cells. However, we observed that anaphase bridges formed in a significant fraction of mouse zygotes irradiated during mitosis. Additionally, γH2AX signals in M phase zygotes peaked 30 min after irradiation and subsequently reduced with a half-life within 1-2 h. These results suggest that the DNA repair system may operate efficiently in M phase zygotes following irradiation, leading to the frequent formation of anaphase bridges. The absence of H2AX promoted the successful segregation of sister chromatids and enhanced the development of embryos to the blastocyst stage. The DNA repair system may be differentially regulated during the M phase of the first cell cycle to ensure the immediate elimination of damaged zygotes, thereby efficiently preventing transmission of mutations to subsequent generations.

Citing Articles

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PMID: 39063584 PMC: 11277789. DOI: 10.3390/life14070830.

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