It is known that mutations in the DKC1 and ATRX genes might cause microcephaly (in the case of DKC1 seen in the Hoyeraal-Hreidarsson Syndrome variant only), so characteristic for mutations in WDR62, nevertheless the open question is whether what we have here is the real dual or triple molecular diagnosis. The gene discussed is DKC1; the disease is Hoyeraal-Hreidarsson syndrome.