title: Intragenic SNP haplotypes associated with 84dup18 mutation in TNFRSF11A in four FEO pedigrees suggest three independent origins for this mutation.
abstract: Familial expansile osteolysis (FEO) is a rare disorder causing bone dysplasia. The clinical features of FEO include early-onset hearing loss, tooth destruction, and progressive lytic expansion within limb bones causing pain, fracture, and deformity. An 18-bp duplication in the first exon of the TNFRSF11A gene encoding RANK has been previously identified in four FEO pedigrees. Despite having the identical mutation, phenotypic variations among affected individuals of the same and different pedigrees were noted. Another 18-bp duplication, one base proximal to the duplication previously reported, was subsequently found in two unrelated FEO patients. Finally, mutations overlapping with the mutations found in the FEO pedigrees have been found in ESH and early-onset PDB pedigrees. An Iranian FEO pedigree that contains six affected individuals dispersed in three generations has previously been introduced; here, the clinical features of the proband are reported in greater detail, and the genetic defect of the pedigree is presented. Direct sequencing of the entire coding region and upstream and downstream noncoding regions of TNFRSF11A in her DNA revealed the same 18-bp duplication mutation as previously found in the four FEO pedigrees. Additionally, eight sequence variations as compared to the TNFRSF11A reference sequence were identified, and a haplotype linked to the mutation based on these variations was defined. Although the mutation in the Iranian and four of the previously described FEO pedigrees was the same, haplotypes based on the intragenic SNPs suggest that the mutations do not share a common descent.
authors: National Institute for Genetic Engineering and Biotechnology, Tehran-Karaj Expressway, Km 17 Pajouhesh Boulevard, Tehran, Iran. elahe.elahi@acnet.ir
authors: Elahe
authors: E
authors: Elahi
authors: Yousef
authors: Y
authors: Shafaghati
authors: Sareh
authors: S
authors: Asadi
authors: Farnaz
authors: F
authors: Absalan
authors: Hani
authors: H
authors: Goodarzi
authors: Nava
authors: N
authors: Gharaii
authors: Mohammad Hassan
authors: MH
authors: Karimi-Nejad
authors: Farhad
authors: F
authors: Shahram
authors: Anne E
authors: AE
authors: Hughes
mesh_terms: D000328:Adult; D001483:Base Sequence; D004252:DNA Mutational Analysis; D005091:Exons / Q000235:genetics; D005260:Female; D006239:Haplotypes; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D010014:Osteolysis / Q000235:genetics*; D010375:Pedigree; D010641:Phenotype; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D011859:Radiography; D053246:Receptor Activator of Nuclear Factor-kappa B / Q000235:genetics*; D013977:Tibia / Q000000981:diagnostic imaging
chemical_list: D053246:Receptor Activator of Nuclear Factor-kappa B; C505686:TNFRSF11A protein, human