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Post-transcriptional deregulation is a defining feature of metastatic cancer. While many microRNAs have been implicated as regulators of metastatic progression, less is known about the roles and mechanisms of RNA-binding proteins in this process. We identified muscleblind-like 1 (MBNL1), a gene implicated in myotonic dystrophy, as a robust suppressor of multiorgan breast cancer metastasis. MBNL1 binds the 3′ untranslated regions (UTRs) of  DBNL  (drebrin-like protein) and  TACC1  (transforming acidic coiled-coil containing protein 1)—two genes that we implicate as metastasis suppressors. By enhancing the stability of these genes’ transcripts, MBNL1 suppresses cell invasiveness. Consistent with these findings, elevated  MBNL1  expression in human breast tumors is associated with reduced metastatic relapse likelihood. Our findings delineate a post-transcriptional network that governs breast cancer metastasis through RNA-binding protein-mediated transcript stabilization.

Muscleblind-like 1 suppresses breast cancer metastatic colonization and stabilizes metastasis suppressor transcripts