title: Long-term survival in typical thanatophoric dysplasia type 1.
abstract: Thanatophoric dysplasia (TD), a severe skeletal dysplasia, is virtually always lethal neonatally, although a few previous reports have documented survival up to 4.75 years. We present a patient with survival beyond age 9 years and summarize his growth, development and medical history. The common Arg248Cys mutation in the extracellular region of fibroblast growth factor receptor 3 (FGFR3) was identified, eliminating the possibility that his long-term survival is attributable to an atypical mutation. This patient (and at least one other TD long-term survivor) have a rare skin disorder, acanthosis nigricans, which also occurs in Crouzon syndrome when caused by a FGFR3 mutation. Therefore, any molecular model of the origin of acanthosis nigricans secondary to FGFR3 mutations must account for the association of diverse mutations and these cutaneous effects.
authors.affiliation: Department of Medical Genetics, University of Wisconsin-Madison 53705, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Baker
authors.forename: D S
authors.initials: DS
authors.lastname: Olson
authors.forename: C O
authors.initials: CO
authors.lastname: Harding
authors.forename: R M
authors.initials: RM
authors.lastname: Pauli
mesh_terms: D000052:Acanthosis Nigricans / Q000175:diagnosis / Q000235:genetics; D000328:Adult; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D017354:Point Mutation / Q000235:genetics; D011505:Protein-Tyrosine Kinases; D011859:Radiography; D051498:Receptor, Fibroblast Growth Factor, Type 3; D017468:Receptors, Fibroblast Growth Factor / Q000235:genetics; D017741:Survivors; D013796:Thanatophoric Dysplasia / Q000000981:diagnostic imaging / Q000235:genetics* / Q000401:mortality
chemical_list: D017468:Receptors, Fibroblast Growth Factor; C496365:FGFR3 protein, human; D011505:Protein-Tyrosine Kinases; D051498:Receptor, Fibroblast Growth Factor, Type 3