In cancers such as glioblastomas overexpressing TUT4 and TUT7, pre-miR-324 is uridylated at the 3′ end, which leads to the 3′ arm-derived miR-324-3p being more abundant than the miR-342-5p derived from the 5′ arm of the same precursor hairpin (Kim et al. 2020). Here, TUT7 is linked to cancer.