title: X-linked dyskeratosis congenita is caused by mutations in a highly conserved gene with putative nucleolar functions.
abstract: 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.
authors.affiliation: Deutsches Krebsforschungszentrum, Department of Molecular Genome Analysis, Heidelberg, Germany.
authors.forename: N S
authors.initials: NS
authors.lastname: Heiss
authors.forename: S W
authors.initials: SW
authors.lastname: Knight
authors.forename: T J
authors.initials: TJ
authors.lastname: Vulliamy
authors.forename: S M
authors.initials: SM
authors.lastname: Klauck
authors.forename: S
authors.initials: S
authors.lastname: Wiemann
authors.forename: P J
authors.initials: PJ
authors.lastname: Mason
authors.forename: A
authors.initials: A
authors.lastname: Poustka
authors.forename: I
authors.initials: I
authors.lastname: Dokal
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018797:Cell Cycle Proteins / Q000737:chemistry / Q000235:genetics; D002466:Cell Nucleolus / Q000378:metabolism*; D018076:DNA, Complementary; D019871:Dyskeratosis Congenita / Q000235:genetics*; D005656:Fungal Proteins / Q000235:genetics; D017353:Gene Deletion; D008040:Genetic Linkage; D006801:Humans; D006836:Hydro-Lyases; D008869:Microtubule-Associated Proteins / Q000235:genetics; D008969:Molecular Sequence Data; D009154:Mutation; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics; D016601:RNA-Binding Proteins / Q000235:genetics; D051381:Rats; D017411:Ribonucleoproteins, Small Nuclear; D012441:Saccharomyces cerevisiae / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D014960:X Chromosome
chemical_list: D018797:Cell Cycle Proteins; C112148:DKC1 protein, human; D018076:DNA, Complementary; D005656:Fungal Proteins; D008869:Microtubule-Associated Proteins; C107170:NAP57; D009687:Nuclear Proteins; D016601:RNA-Binding Proteins; D017411:Ribonucleoproteins, Small Nuclear; D029701:Saccharomyces cerevisiae Proteins; D006836:Hydro-Lyases; C082278:CBF5 protein, S cerevisiae