The Relationship Between DNA Single-stranded Damage Response and Double-stranded Damage Response

Overview

Journal Cell Cycle

Specialty Cell Biology

Date 2017 Nov 22

PMID 29157089

Citations 16

Authors

Aiqing Ma

Xianhua Dai

Affiliations

Soon will be listed here.

Abstract

The damage response of DNA single-stranded breaks(SSBs) and double-stranded breaks(DSBs) are two relatively independent processes involving different signaling pathways and protein factors, but there are still many overlapping parts. All of them can activate p53 protein, then the activated p53 regulates the damage response of single-stranded breaks or double-stranded breaks in transcriptional regulation and non-transcriptional regulation. Especially, the two types of damage would compete for RPA and ATR resources in damage repair process. The research has been focused on damage response of DNA single-stranded breaks or DNA double-stranded breaks. However, when single-stranded breaks and double-stranded breaks exist simultaneously, the DNA damage response remains to be elucidated. Here, we present a hybrid numerical model of p53 response and a hybrid numerical model of DNA damage repair exploring DNA damage repair and apoptosis mechanisms when DNA single-stranded breaks and DNA double-stranded breaks exist simultaneously. Firstly, when two kinds of damage are present at the same time, the response of p53 is graded, it means that p53 responds to single-stranded breaks preferentially; Secondly, DNA single-stranded breaks are repaired preferentially, and single-stranded breaks and double-stranded breaks can be repaired simultaneously after most of single-stranded breaks having been repaired; Moreover, single-stranded breaks are more likely to cause apoptosis, because the accumulation of p53 in DNA single-stranded breaks is faster than it in DNA double-stranded breaks and single-stranded breaks has lower threshold of apoptosis.

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