Any dyskeratosis congenita in which the cause of the disease is a mutation in the DKC1 gene. [ http://www.ncbi.nlm.nih.gov/pubmed/19633571 http://www.ncbi.nlm.nih.gov/pubmed/12437656 https://clinicalgenome.org/affiliation/40006/ http://www.ncbi.nlm.nih.gov/pubmed/14648217 http://www.ncbi.nlm.nih.gov/pubmed/10583221 ]