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Autophagy regulates DNA repair through SQSTM1/p62.
Autophagy 2017 June 4
Macroautophagy/autophagy is primarily a degradative pathway that clears malfunctioning cellular components in response to various types of stress. Recent studies have indicated that autophagy also plays an important role in maintaining genome stability. Loss of autophagy is associated with increased damage to DNA, inappropriate amplification of genomic regions and abnormal chromosome number. In a recent paper by Wang et al. the authors uncover a mechanism through which autophagy regulates the ubiquitination of chromatin. In particular, the autophagy receptor and substrate SQSTM1/p62 inhibits the E3 ligase RNF168-dependent ubiquitination of histone in response to DNA double-strand breaks. Dysregulation of this process leads to a reduced ability to repair DNA and a corresponding increase in the sensitivity of cells to radiation-induced damage.
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