RNA Polymerase I Dysfunction Underlying Craniofacial Syndromes: Integrated Genetic Analysis Reveals Parallels to 22q11.2 Deletion Syndrome

Significant clinical and genetic overlap exists among Saethre-Chotzen, Sweeney-Cox, Treacher-Collins types 2-4, and Acrofacial Dysostosis-Cincinnati. POLR1A and related Pol I subunits provide a mechanistic basis through impaired nucleolar organization and rRNA transcription, contributing to abnormal craniofacial development. Integrative protein, gene, and structural analyses support classifying these syndromes as Pol I-related ribosomopathies, with implications for diagnosis, counseling, and future mechanistic or therapeutic studies.