ZNF431 is a KRAB domain-containing zinc finger transcription factor that functions as a sequence-specific DNA-binding transcriptional repressor 1. The protein represses target gene transcription by recruiting histone deacetylases HDAC1 and HDAC2 to chr19 1, binding to consensus sequences in gene promoters to inhibit RNA polymerase II-dependent transcription. ZNF431 directly represses Patched1 (PTCH1) transcription through three identified binding sites in its promoter, thereby regulating sonic hedgehog signaling 1. ZNF431 is required for osteoblast differentiation and proper hedgehog pathway response during embryonic development. Clinically, ZNF431 is implicated in primary immunodeficiency disorders. Autosomal recessive mutations in ZNF431 cause a hyper IgE syndrome variant characterized by atopic dermatitis, recurrent skin and lung infections, and elevated immunoglobulin E levels 2. Additionally, ZNF431 has been identified as a recessive locus associated with non-syndromic cleft lip and/or palate in consanguineous families, though functional mechanisms remain unclear 3. ZNF431 was also identified as a potential gene related to tumor-infiltrating plasma cells in lung adenocarcinoma and may have implications in cancer prognosis 4.