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Mol Cell. 2015 May 7;58(3):468-82. doi: 10.1016/j.molcel.2015.03.023. Epub 2015 Apr 23.

Transcriptional elongation factor ENL phosphorylated by ATM recruits polycomb and switches off transcription for DSB repair.

Author information

1
Division of Dynamic Proteome in Cancer and Aging, Institute of Development, Aging and Cancer, Tohoku University, Seiryo-machi 4-1, Aoba-ku, Sendai 980-8575, Japan. Electronic address: aui@marianna-u.ac.jp.
2
Division of Dynamic Proteome in Cancer and Aging, Institute of Development, Aging and Cancer, Tohoku University, Seiryo-machi 4-1, Aoba-ku, Sendai 980-8575, Japan.
3
Division of Dynamic Proteome in Cancer and Aging, Institute of Development, Aging and Cancer, Tohoku University, Seiryo-machi 4-1, Aoba-ku, Sendai 980-8575, Japan. Electronic address: ayasui@idac.tohoku.ac.jp.

Abstract

Transcription is repressed if a DNA double-strand break (DSB) is introduced in close proximity to a transcriptional activation site at least in part by H2A-ubiquitination. While ATM signaling is involved, how it controls H2A-ubiquitination remains unclear. Here, we identify that, in response to DSBs, a transcriptional elongation factor, ENL (MLLT1), is phosphorylated by ATM at conserved SQ sites. This phosphorylation increases the interaction between ENL and the E3-ubiquitin-ligase complex of Polycomb Repressive Complex 1 (PRC1) via BMI1. This interaction promotes enrichment of PRC1 at transcription elongation sites near DSBs to ubiquitinate H2A leading to transcriptional repression. ENL SQ sites and BMI1 are necessary for KU70 accumulation at DSBs near active transcription sites and cellular resistance to DSBs. Our data suggest that ATM-dependent phosphorylation of ENL functions as switch from elongation to Polycomb-mediated repression to preserve genome integrity.

PMID:
25921070
DOI:
10.1016/j.molcel.2015.03.023
[Indexed for MEDLINE]
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