ZNF430 is a zinc finger transcription factor located on chromosome 19 that functions as a DNA-binding protein with RNA polymerase II-specific regulatory activity 1. The gene encodes a transcriptional regulator involved in nucleus-localized, DNA-templated transcription control through sequence-specific binding to cis-regulatory regions. Mechanistically, ZNF430 emerged during simian evolution to specifically silence THE1B retrotransposon elements in the primate genome 1. Contact residue changes in its zinc finger domain confer preferential repression of THE1B over THE1A subfamilies, with the protein binding to intact ZNF430 recognition sites within these elements 1. This anti-viral function prevents THE1B-mediated upregulation of corticotropin-releasing hormone, suggesting ZNF430 suppresses this retrovirus's activity in most tissues including placenta 1. Clinically, ZNF430 has been identified as significantly mutated in mucosal melanoma patients in genomic studies 2, though the functional consequences of these mutations remain unclear. The evolutionary arms race between ZNF430/ZNF100 and THE1 retrotransposons illustrates the gene's role in genome defense against transposable elements, with implications for understanding human health and disease mechanisms 3.