title: FGFR3 mutation frequency in 324 cases from the International Skeletal Dysplasia Registry.
abstract: Fibroblast growth factor receptor 3 (FGFR3) is the only gene known to cause achondroplasia (ACH), hypochondroplasia (HCH), and thanatophoric dysplasia types I and II (TD I and TD II). A second, as yet unidentified, gene also causes HCH. In this study, we used sequencing analysis to determine the frequency of FGFR3 mutations for each phenotype in 324 cases from the International Skeletal Dysplasia Registry (ISDR). Our data suggest that there is a considerable overlap of genotype and phenotype between ACH and HCH. Thus, it is important to test for mutations found in either disorder when ACH or HCH is suspected. Only two of 29 cases with HCH did not have an identified mutation in FGFR3, much less than previously reported. We recommend testing other mutations in FGFR3, instead of just the common HCH mutation, p.Asn540Lys. The mutation frequency for TD I and TD II in the largest series of cases to date are also reported. This study provides valuable information on FGFR3 mutation frequency of four skeletal dysplasias for clinical diagnostic laboratories and clinicians.
authors.affiliation: Department of Human Genetics, Emory University Atlanta, Georgia, 30322.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xue
authors.affiliation: Medical Genetics Institute, Cedars-Sinai Medical Center Los Angeles, California.
authors.forename: Angela
authors.initials: A
authors.lastname: Sun
authors.affiliation: Medical Genetics Institute, Cedars-Sinai Medical Center Los Angeles, California.
authors.forename: P Betty
authors.initials: PB
authors.lastname: Mekikian
authors.affiliation: Medical Genetics Institute, Cedars-Sinai Medical Center Los Angeles, California.
authors.forename: Jorge
authors.initials: J
authors.lastname: Martin
authors.affiliation: Medical Genetics Institute, Cedars-Sinai Medical Center Los Angeles, California ; Department of Pediatrics, UCLA School of Medicine Los Angeles, California.
authors.forename: David L
authors.initials: DL
authors.lastname: Rimoin
authors.affiliation: Medical Genetics Institute, Cedars-Sinai Medical Center Los Angeles, California.
authors.forename: Ralph S
authors.initials: RS
authors.lastname: Lachman
authors.affiliation: Department of Human Genetics, Emory University Atlanta, Georgia, 30322 ; Medical Genetics Institute, Cedars-Sinai Medical Center Los Angeles, California ; Department of Pediatrics, UCLA School of Medicine Los Angeles, California.
authors.forename: William R
authors.initials: WR
authors.lastname: Wilcox
keywords: Achondroplasia; FGFR3; hypochondroplasia; mutation frequency; thanatophoric dysplasia