FRMD4B encodes a FERM domain-containing protein that functions as a scaffolding protein in cellular signaling and membrane organization. The protein is a member of GRP1 signaling complexes recruited to plasma membrane ruffles in response to insulin receptor signaling and may regulate epithelial cell polarity by connecting ARF6 activation with the PAR3 complex, playing a redundant role with FRMD4A in epithelial polarization. Recent functional studies have identified FRMD4B as a novel candidate gene for ocular congenital cranial dysinnervation disorders, with zebrafish knockout models demonstrating its contribution to cranial motor development 1. Disease association studies have revealed significant genetic variants within FRMD4B linked to multiple conditions. The intronic variant rs6787362 shows replicated association with advanced heart failure, particularly ischemic cardiomyopathy, in Caucasian populations, with the minor allele providing protective effects 23. Additionally, FRMD4B variants have been associated with celiac disease susceptibility 4 and glucocorticoid sensitivity in B-cell precursor acute lymphoblastic leukemia cells 5. The gene has also been identified as a transcriptomic biomarker for distinguishing benign from malignant melanocytic neoplasms 6, highlighting its diverse roles in cellular function and disease pathogenesis.