A Cockayne-Syndrome-Like Phenotype with a Homozygous Truncating UVSSA Variant: Might This Be a New Cause?

UV-sensitive syndrome and Cockayne syndrome (CS) are rare autosomal recessive and transcription-coupled nucleotide excision repair disorders with different clinical manifestations, although some types are allelic. We report on a patient who passed away at 15 years old with a progeroid-like appearance, cachexia, hearing loss, and dental anomalies, which led us to the diagnosis of Cockayne-like progeroid syndromes. Our clinical exome sequencing including all the known genes of progeroid syndromes revealed a homozygous stop-gain variant in the gene. Although truncating variants in the are known to cause UVsS3, their association with CS has not yet been defined. This case might be the first report of a CS-like phenotype caused by a defective .