Any COFS syndrome in which the cause of the disease is a mutation in the ERCC6 gene. The disease is cerebrooculofacioskeletal syndrome 1 (Monarch Disease Ontology id MONDO_0008955). Also known as: COFS syndrome caused by mutation in ERCC6, COFS1, ERCC6 COFS syndrome, cerebrooculofacioskeletal syndrome type 1.