Role of Paralogue of XRCC4 and XLF in DNA Damage Repair and Cancer Development.

Jialin Tang, Zhongxia Li, Qiong Wu, Muhammad Irfan, Weili Li, Xiangyu Liu

Frontiers in immunology 2022

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Non-homologous end joining (cNHEJ) is a major pathway to repair double-strand breaks (DSBs) in DNA. Several core cNHEJ are involved in the progress of the repair such as KU70 and 80, DNA-dependent protein kinase catalytic subunit (DNA-PKcs), Artemis, X-ray repair cross-complementing protein 4 (XRCC4), DNA ligase IV, and XRCC4-like factor (XLF). Recent studies have added a number of new proteins during cNHEJ. One of the newly identified proteins is Paralogue of XRCC4 and XLF (PAXX), which acts as a scaffold that is required to stabilize the KU70/80 heterodimer at DSBs sites and promotes the assembly and/or stability of the cNHEJ machinery. PAXX plays an essential role in lymphocyte development in XLF-deficient background, while XLF/PAXX double-deficient mouse embryo died before birth. Emerging evidence also shows a connection between the expression levels of PAXX and cancer development in human patients, indicating a prognosis role of the protein. This review will summarize and discuss the function of PAXX in DSBs repair and its potential role in cancer development. Copyright © 2022 Tang, Li, Wu, Irfan, Li and Liu.

Citation

Jialin Tang, Zhongxia Li, Qiong Wu, Muhammad Irfan, Weili Li, Xiangyu Liu. Role of Paralogue of XRCC4 and XLF in DNA Damage Repair and Cancer Development. Frontiers in immunology. 2022;13:852453