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Bhowmick, Rahul; Hickson, Ian D.; Liu, Ying
Molecular cell, 10/2023, Letnik: 83, Številka: 20Journal Article
Mitotic DNA synthesis (MiDAS) is an unusual form of DNA replication that occurs during mitosis. Initially, MiDAS was characterized as a process associated with intrinsically unstable loci known as common fragile sites that occurs after cells experience DNA replication stress (RS). However, it is now believed to be a more widespread “salvage” mechanism that is called upon to complete the duplication of any under-replicated genomic region. Emerging data suggest that MiDAS is a DNA repair process potentially involving two or more pathways working in parallel or sequentially. In this review, we introduce the causes of RS, regions of the human genome known to be especially vulnerable to RS, and the strategies used to complete DNA replication outside of S phase. Additionally, because MiDAS is a prominent feature of aneuploid cancer cells, we will discuss how targeting MiDAS might potentially lead to improvements in cancer therapy. Some loci in the human genome cannot be fully replicated during S phase and complete DNA replication in G2 or early mitosis, a feature that is exacerbated by oncogene activation and other drivers of replication stress. Here, we discuss the strategies used by cells to complete genome duplication outside of S phase.
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