Negative regulation of CDKN1A by the histone methyltransferase EHMT2 for cell growth in colorectal cancer

The epigenetic regulation of oncogenes and tumor suppressor genes by histone methyltransferases is an important process for colon cancer growth and metastasis. Although various epigenetic modifiers have been recognized as attractive therapeutic targets for colon cancer treatment, alternative epigenetic regulation in colon cancer for reducing side effects and increasing the effectiveness of treatments has not been thoroughly explored. In this study, we identified CDKN1A as a direct target for EHMT2 by RNA-sequencing and found increased growth suppression via upregulation of CDKN1A by EHMT2 knockdown. In addition, using a 3-dimensional culture system for spheroid formation with an ultralow attachment plate, we confirmed EHMT2-related growth suppression and CDKN1A regulation. Thus, we suggest that EHMT2 may be a therapeutic target for colon cancer treatment, and an EHMT2 inhibitor should be developed for the effective treatment of colon cancer.