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The m 6 A writer RBM15 drives the growth of triple-negative breast cancer cells through the stimulation of serine and glycine metabolism.

N6 -adenosine methylation (m6 A) is critical for controlling cancer cell growth and tumorigenesis. However, the function and detailed mechanism of how m6 A methyltransferases modulate m6 A levels on specific targets remain unknown. In the current study, we identified significantly elevated levels of RBM15, an m6 A writer, in basal-like breast cancer (BC) patients compared to nonbasal-like BC patients and linked this increase to worse clinical outcomes. Gene expression profiling revealed correlations between RBM15 and serine and glycine metabolic genes, including PHGDH, PSAT1, PSPH, and SHMT2. RBM15 influences m6 A levels and, specifically, the m6 A levels of serine and glycine metabolic genes via direct binding to target RNA. The effects of RBM15 on cell growth were largely dependent on serine and glycine metabolism. Thus, RBM15 coordinates cancer cell growth through altered serine and glycine metabolism, suggesting that RBM15 is a new therapeutic target in BC.

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