title: Fine mapping of chromosome 17 translocation breakpoints > or = 900 Kb upstream of SOX9 in acampomelic campomelic dysplasia and a mild, familial skeletal dysplasia.
abstract: Previously, our group reported a five-generation family in which a balanced t(13;17) translocation is associated with a spectrum of skeletal abnormalities, including Robin sequence, hypoplastic scapulae, and a missing pair of ribs. Using polymerase chain reaction (PCR) with chromosome-specific markers to analyze DBA from somatic cell hybrids containing the derivative translocation chromosomes, we narrowed the breakpoint on each chromosome. Subsequent sequencing of PCR products spanning the breakpoints identified the breaks precisely. The chromosome 17 breakpoint maps approximately 932 kb upstream of the sex-determining region Y (SRY)-related high-mobility group box gene (SOX) within a noncoding transcript represented by two IMAGE cDNA clones. A growing number of reports have implicated chromosome 17 breakpoints at a distance of up to 1 Mb from SOX9 in some cases of campomelic dysplasia (CD). Although this multigeneration family has a disorder that shares some features with CD, their phenotype is significantly milder than any reported cases of (nonmosaic) CD. Therefore, this case may represent an etiologically distinct skeletal dysplasia or may be an extremely mild familial example of CD, caused by the most proximal translocation breakpoint from SOX9 reported to date. In addition, we have refined the breakpoint in a acampomelic CD case described elsewhere and have found that it lies approximately 900 kb upstream of SOX9.
authors.affiliation: Division of Genetics, Department of Pediatrics, University of Florida College of Medicine, Gainesville, USA.
authors.forename: Katherine L
authors.initials: KL
authors.lastname: Hill-Harfe
authors.forename: Lee
authors.initials: L
authors.lastname: Kaplan
authors.forename: Heather J
authors.initials: HJ
authors.lastname: Stalker
authors.forename: Roberto T
authors.initials: RT
authors.lastname: Zori
authors.forename: Ramona
authors.initials: R
authors.lastname: Pop
authors.forename: Gerd
authors.initials: G
authors.lastname: Scherer
authors.forename: Margaret R
authors.initials: MR
authors.lastname: Wallace
mesh_terms: D001483:Base Sequence; D001848:Bone Diseases, Developmental / Q000235:genetics*; D019457:Chromosome Breakage; D002874:Chromosome Mapping; D002886:Chromosomes, Human, Pair 17; D006609:High Mobility Group Proteins / Q000235:genetics*; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D055758:SOX9 Transcription Factor; D014157:Transcription Factors / Q000235:genetics*; D014178:Translocation, Genetic
chemical_list: D006609:High Mobility Group Proteins; D055758:SOX9 Transcription Factor; C527932:SOX9 protein, human; D014157:Transcription Factors
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