1. A genomic rearrangement resulting in a tandem duplication is associated with split hand-split foot malformation 3 (SHFM3) at 10q24.
- Author
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de Mollerat XJ, Gurrieri F, Morgan CT, Sangiorgi E, Everman DB, Gaspari P, Amiel J, Bamshad MJ, Lyle R, Blouin JL, Allanson JE, Le Marec B, Wilson M, Braverman NE, Radhakrishna U, Delozier-Blanchet C, Abbott A, Elghouzzi V, Antonarakis S, Stevenson RE, Munnich A, Neri G, and Schwartz CE
- Subjects
- Cell Line, Transformed, Electrophoresis, Gel, Pulsed-Field, F-Box Proteins, Gene Duplication, Humans, Hybrid Cells, Models, Genetic, Pedigree, Phenotype, Polymorphism, Single-Stranded Conformational, Sequence Analysis, DNA, Abnormalities, Multiple genetics, Chromosome Aberrations, Chromosomes, Human, Pair 10, Foot Deformities genetics, Hand Deformities genetics, Proteins genetics
- Abstract
Split hand-split foot malformation (SHFM) is characterized by hypoplasia/aplasia of the central digits with fusion of the remaining digits. SHFM is usually an autosomal dominant condition and at least five loci have been identified in humans. Mutation analysis of the DACTYLIN gene, suspected to be responsible for SHFM3 in chromosome 10q24, was conducted in seven SHFM patients. We screened the coding region of DACTYLIN by single-strand conformation polymorphism and sequencing, and found no point mutations. However, Southern, pulsed field gel electrophoresis and dosage analyses demonstrated a complex rearrangement associated with a approximately 0.5 Mb tandem duplication in all the patients. The distal and proximal breakpoints were within an 80 and 130 kb region, respectively. This duplicated region contained a disrupted extra copy of the DACTYLIN gene and the entire LBX1 and beta-TRCP genes, known to be involved in limb development. The possible role of these genes in the SHFM3 phenotype is discussed.
- Published
- 2003
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