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Adv."],"published-print":{"date-parts":[[2026,10,9]]},"abstract":"<jats:p>Prostate cancer (CaP) remains a major cause of cancer death in men, underscoring the need for mechanistically novel therapies. We previously identified the action of the mitotic kinase citron (CIT) kinase as a key driver of CaP progression and promising therapeutic target, but selective CIT inhibitors are not available. We therefore asked whether a better understanding of the action of CIT substrates, which execute CIT kinase action in CaP cells, can lead to novel approaches and\/or alternative targets to indirectly interfere with CIT\u2019s activity during CaP progression. In view of the enrichment in functions in alternative splicing among CIT substrates, we focus on the RNA splicing regulator THRAP3 as a representative substrate. Direct THRAP3 phosphorylation by CIT determined THRAP3\u2019s RNA binding to CIT-controlled pre\u2013messenger RNA targets. Cross-linking and immunoprecipitation sequencing identified a subset of CIT-dependent THRAP3-bound genes that were preferentially involved in cell proliferation. THRAP3 RNA binding was enriched in genes that undergo alternative splicing during CaP progression. CIT-dependent THRAP3-bound transcripts stimulated the growth of CaP cell lines, xenografts, patient-derived organoids, and patient-derived xenograft (PDX)\u2013derived organoids, whereas CIT-independent THRAP3-bound transcripts from the same gene did not. An antisense oligo that blocks THRAP3\u2019s recruitment to a CIT-dependent RNA binding site prevented the production of CIT- and THRAP3-dependent transcripts and inhibited the growth of cell lines and PDX-derived organoids representing different CaP stages and lineages but not of benign cells. 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