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- Title
Mutations in a new gene, encoding a zinc-finger protein, cause tricho-rhino-phalangeal syndrome type I.
- Authors
Momeni, P; Glöckner, G; Schmidt, O; von Holtum, D; Albrecht, B; Gillessen-Kaesbach, G; Hennekam, R; Meinecke, P; Zabel, B; Rosenthal, A; Horsthemke, B; Lüdecke, H J
- Abstract
Tricho-rhino-phalangeal syndrome type I (TRPS I, MIM 190350) is a malformation syndrome characterized by craniofacial and skeletal abnormalities and is inherited in an autosomal dominant manner. TRPS I patients have sparse scalp hair, a bulbous tip of the nose, a long flat philtrum, a thin upper vermilion border and protruding ears. Skeletal abnormalities include cone-shaped epiphyses at the phalanges, hip malformations and short stature. We assigned TRPS1 to human chromosome 8q24. It maps proximal of EXT1, which is affected in a subgroup of patients with multiple cartilaginous exostoses and deleted in all patients with TRPS type II (TRPS II, or Langer-Giedion syndrome, MIM 150230; ref.2-5). We have positionally cloned a gene that spans the chromosomal breakpoint of two patients with TRPS I and is deleted in five patients with TRPS I and an interstitial deletion. Northern-blot analyses revealed transcripts of 7 and 10.5 kb. TRPS1has seven exons and an ORF of 3,843 bp. The predicted protein sequence has two potential nuclear localization signals and an unusual combination of different zinc-finger motifs, including IKAROS-like and GATA-binding sequences. We identified six different nonsense mutations in ten unrelated patients. Our findings suggest that haploinsufficiency for this putative transcription factor causes TRPS I.
- Publication
Nature genetics, 2000, Vol 24, Issue 1, p71
- ISSN
1061-4036
- Publication type
Journal Article
- DOI
10.1038/71717