Tandem duplication within a Neurofibromatosis type I (NFI) gene exon in a family with features of Watson syndrome and Noonan syndrome
- Univ. Department of Medical Genetics, St. Mary's Hospital, Manchester (United Kingdom)
- St. George's Hospital Medical School, Cranmer Terrace, London (United Kingdom)
Type 1 neurofibromatosis (NF1), Watson syndrome (WS), and Noonan syndrome (NS) show some overlap in clinical manifestations. In addition, WS has been shown to be linked to markers flanking the NF1 locus and a deletion at the NF1 locus demonstrated in a WS patient. This suggests either that WS and NF1 are allelic or the phenotypes arise from mutations in very closely linked genes. Here the authors provide evidence for the former by demonstrating a mutation in the NF1 gene in a family with features of both WS and NS. The mutation is an almost perfect in-frame tandem duplication of 42 bases in exon 28 of the NF1 gene. Unlike the mutations previously described in classical NF1, which show a preponderance of null alleles, the mutation in this family would be expected to result in a mutant neurofibromin product. 31 refs., 2 figs.
- OSTI ID:
- 5914895
- Journal Information:
- American Journal of Human Genetics; (United States), Vol. 53:1; ISSN 0002-9297
- Country of Publication:
- United States
- Language:
- English
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