CITED1 is a transcriptional coactivator that functions as a non-DNA-binding transcription co-regulator, primarily acting through interactions with CBP/p300 co-activators via its conserved transactivation domain CR2 1. The protein regulates diverse signaling pathways including TGF-β/BMP/SMAD, estrogen, Wnt-β-catenin, and androgen-AR pathways 1. CITED1 plays a key role in cellular metabolism by promoting beige adipocyte-related gene expression and enhancing mitochondrial respiration 2. In immune responses, CITED1 acts as an interferon-stimulated gene that enhances expression of proinflammatory genes like Ccl2, Ifit3b, Isg15 and Oas2 during prolonged IFNγ exposure in macrophages 3. The protein demonstrates significant disease relevance in cancer biology, where it promotes tumor progression through activation of the PI3K/AKT pathway in papillary thyroid carcinoma 4 and confers stemness properties to Wilms tumor cells, with nuclear enrichment enhancing tumorigenicity 5. Clinically, CITED1 serves as a diagnostic marker, with differential expression patterns observed across various odontogenic cysts 6 and utility in distinguishing follicular variants of papillary thyroid carcinomas from follicular adenomas 7. The protein's subcellular localization appears critical for its functional effects, with nuclear enrichment associated with enhanced tumorigenic responses 5.