DC is a rare autosomal-dominant disorder caused by mutations in TERC (telomerase RNA component), TERT (telomerase reverse transcriptase), WRAP53 (WD repeat component, antisense to TP53) or CTC1 (CTS telomere maintenance complex component 1), among other genes (Stanley and Armanios, 2015). The gene discussed is TERT; the disease is dyskeratosis congenita.