Atypical radiological findings in achondroplasia with uncommon mutation of the fibroblast growth factor receptor-3 (FGFR-3) gene (Gly to Cys transition at codon 375)
- Dokkyo Univ. School of Medicine, Tochigi (Japan)
- Saitama Children`s Medical Center, Saitama (Japan)
- Tokyo Univ. (Japan)
The recent discovery of mutations in the FGFR-3 (fibroblast growth factor receptor-3) gene (FGFR3) as the cause of achondroplasia has provided new insight into understanding genetic diseases. It was surprising from the viewpoint of molecular genetics that most patients with achondroplasia showed the same mutation at nucleotide 1138, leading to a single amino acid substitution from glycine to arginine at codon 380 (Gly380Arg). All 39 patients examined by two groups had the Gly380Arg; 38 patients and the other demonstrated a G to A and a G to C transition at nucleotide 1138, respectively. Subsequently another group disclosed a G to A transition at the same nucleotide 1138 in 21/23 patients of diverse ethnic origin, although mutations were not identified in two patients. To date, a total of 193 patients with the mutation of the G380Arg have been reported; a single patient with another mutation resulting in a substitution from glycine to cysteine at codon 375 (Gly375Cys) has been described. The presence of this common mutation is consistent with the clinical fact that achondroplastic individuals show less phenotypic variability than is unusual for autosomal dominant diseases. We encountered a Japanese boy with the Gly375Cys. His mother with achondroplasia has the same mutation. The molecular investigation of these patients was reported elsewhere. Here we report the clinical and radiological findings in this boy who demonstrated some atypical manifestations from those of typical achondroplasia. 8 refs., 1 fig.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 447089
- Journal Information:
- American Journal of Medical Genetics, Vol. 59, Issue 3; Other Information: PBD: 20 Nov 1995
- Country of Publication:
- United States
- Language:
- English
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