KMT9 Controls Stemness and Growth of Colorectal Cancer

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Abstract

Colorectal cancer is among the leading causes of cancer-associated deaths worldwide. Treatment failure and tumor recurrence due to survival of therapy-resistant cancer stem/initiating cells represent major clinical issues to overcome. In this study, we identified lysine methyltransferase 9 (KMT9), an obligate heterodimer composed of KMT9a and KMT9b that monomethylates histone H4 at lysine 12 (H4K12me1), as an important regulator in colorectal tumorigenesis. KMT9a and KMT9b were overexpressed in colorectal cancer and colocalized with H4K12me1 at promoters of target genes involved in the regulation of proliferation. Ablation of KMT9a drastically reduced colorectal tumorigenesis in mice and prevented the growth of murine as well as human patient-derived tumor organoids. Moreover, loss of KMT9a impaired the maintenance and function of colorectal cancer stem/initiating cells and induced apoptosis specifically in this cellular compartment. Together, these data suggest that KMT9 is an important regulator of colorectal carcinogenesis, identifying KMT9 as a promising therapeutic target for the treatment of colorectal cancer.

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Berlin, C., Cottard, F., Willmann, D., Urban, S., Tirier, S. M., Marx, L., … Schule, R. (2022). KMT9 Controls Stemness and Growth of Colorectal Cancer. Cancer Research, 82(2), 210–220. https://doi.org/10.1158/0008-5472.CAN-21-1261

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