ATM suppresses c-Myc overexpression in the mammary epithelium in response to estrogen

Rifat Ara Najnin, Md Rasel Al Mahmud, Md Maminur Rahman, Shunichi Takeda, Hiroyuki Sasanuma, Hisashi Tanaka, Yasuhiro Murakawa, Naoto Shimizu, Salma Akter, Masatoshi Takagi, Takuro Sunada, Shusuke Akamatsu, Gang He, Junji Itou, Masakazu Toi, Mary Miyaji, Kimiko M. Tsutsui, Scott Keeney, Shintaro Yamada

研究成果査読

2 被引用数 (Scopus)

抄録

ATM gene mutation carriers are predisposed to estrogen-receptor-positive breast cancer (BC). ATM prevents BC oncogenesis by activating p53 in every cell; however, much remains unknown about tissue-specific oncogenesis after ATM loss. Here, we report that ATM controls the early transcriptional response to estrogens. This response depends on topoisomerase II (TOP2), which generates TOP2-DNA double-strand break (DSB) complexes and rejoins the breaks. When TOP2-mediated ligation fails, ATM facilitates DSB repair. After estrogen exposure, TOP2-dependent DSBs arise at the c-MYC enhancer in human BC cells, and their defective repair changes the activation profile of enhancers and induces the overexpression of many genes, including the c-MYC oncogene. CRISPR/Cas9 cleavage at the enhancer also causes c-MYC overexpression, indicating that this DSB causes c-MYC overexpression. Estrogen treatment induced c-Myc protein overexpression in mammary epithelial cells of ATM-deficient mice. In conclusion, ATM suppresses the c-Myc-driven proliferative effects of estrogens, possibly explaining such tissue-specific oncogenesis.

本文言語English
論文番号111909
ジャーナルCell Reports
42
1
DOI
出版ステータスPublished - 1月 31 2023

ASJC Scopus subject areas

  • 生化学、遺伝学、分子生物学一般

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