DHX40 (DEAH-box helicase 40) is an ATP-dependent RNA helicase belonging to the DExH/D-box superfamily, encoding a 779-amino-acid protein with conserved DEAH motifs 1. The protein is ubiquitously expressed across tissues and is predicted to function in RNA metabolism processes including pre-mRNA splicing and ribosome biogenesis 1. DHX40 interacts with ubiquitin-specific protease USP7 through its Ubl2 domain, and USP7-mediated deubiquitylation stabilizes DHX40 protein levels in cancer cells 2. Functionally, DHX40 emerged as a hub gene in melatonin-sensitive cardiovascular transcriptional networks, potentially contributing to cardioprotective effects 3. Disease relevance includes developmental roles, as altered DHX40 expression was identified in zebrafish tnfaip1 mutants exhibiting developmental delays and microcephaly 4. Additionally, DHX40 copy number variants were identified in congenital scoliosis patients and implicated in bone/spine development pathways 5. Epigenetic analysis revealed DHX40 promoter methylation as a potential biomarker associated with platinum resistance in ovarian cancer 6. These findings suggest DHX40 participates in multiple biological processes from embryonic development to cancer chemotherapy response, though its specific molecular mechanisms in these contexts require further investigation.