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Article
Nature Genetics  19, 32 - 38 (1998)
doi:10.1038/ng0598-32

X-linked dyskeratosis congenita is caused by mutations in a highly conserved gene with putative nucleolar functions

Nina S. Heiss1, Stuart W. Knight2, Tom J. Vulliamy2, Sabine M. Klauck1, Stefan Wiemann1, Philip J. Mason2, Annemarie Poustka1, 3 & Inderjeet Dokal1, 4

  1DeutschesKrebsforschungszentrum, Department of Molecular Genome Analysis, Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.

  2Department of Haematology, Imperial College School of Medicine and Hammersmith Hospital, Du Cane Road, London, W12 ONN, UK.

  3N.S.H., S.W.K. and T.J.V. contributed equally to this work. e-mail: a.poustka@dkfz-heidelberg.de

  4e-mail: i.dokal@rpms.ac.uk

X-linked recessive dyskeratosis congenita (DKC) is a rare bone-marrow failure disorder linked to Xq28. Hybridization screening with 28 candidate cDNAs resulted in the detection of a 3' deletion in one DKC patient with a cDNA probe (derived from XAP101). Five different missense mutations in five unrelated patients were subsequently identified in XAP101, indicating that it is the gene responsible for X-linked DKC (DKC1). DKC1 is highly conserved across species barriers and is the orthologue of rat NAP57 and Saccharomyces cerevisiae CBF5. The peptide dyskerin contains two TruB pseudouridine (Psi) synthase motifs, multiple phosphorylation sites, and a carboxy-terminal lysine-rich repeat domain. By analogy to the function of the known dyskerin orthologues, involvement in the cell cycle and nucleolar function is predicted for the protein.

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