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BMI1?UBR5 axis regulates transcriptional repression at damaged chromatin #MMPMID27647897
Sanchez A; De Vivo A; Uprety N; Kim J; Stevens SM; Kee Y
Proc Natl Acad Sci U S A 2016[Oct]; 113 (40): 11243-8 PMID27647897show ga
The BMI1-containing Polycomb Repressive Complex is an important gene silencer during development, stem cell maintenance, and cancer progression. BMI1 is also involved in DNA damage response, but its downstream mechanism is unclear. Here we identified UBR5 as a downstream factor whose chromatin recruitment is regulated by BMI1. We showed that BMI1 and UBR5 repress the RNA polymerase II (Pol II) elongation and nascent RNA synthesis at UV-induced DNA lesions. UBR5 associates with and regulates the abundance of the histone chaperon complex FACT at damaged chromatin and regulates elongation of Pol II at the lesions. Thus, our studies identify a pathway that regulates the damage-induced transcriptional repression that is governed by BMI1.