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Journal Article
Research Support, Non-U.S. Gov't
Analysis of the CAG repeat region of the androgen receptor gene in a kindred with X-linked spinal and bulbar muscular atrophy.
Journal of the Neurological Sciences 1992 October
Herein we describe a family with X-linked spinal and bulbar muscular atrophy (SBMA or Kennedy's disease), an adult onset neuromuscular disease characterized by slow progression, predominant proximal and bulbar muscle weakness. One frequent association is the appearance of gynecomastia. This disorder was previously shown to be linked to the locus DXYS1 on the proximal long arm of the X chromosome. Recently, a report implicated a mutation at the N-terminus of the androgen receptor gene involving amplification of CAG repeats as the cause of X-linked SBMA. We studied this region of the androgen receptor in a kindred clinically suspected but not confirmed of having X-linked SBMA by the polymerase chain reaction (PCR) followed by Southern analysis and DNA sequencing. The mutated allele was found to have an increased number of 51 CAG repeats confirming the clinical diagnosis of SBMA. Normal individuals revealed 23 repeat numbers within the normal range, while another unrelated X-linked SBMA patient had an enlarged CAG repeat region. The carrier or disease status could be established or confirmed in 12 individuals of this family on the basis of detecting normal and disease alleles reflected by the number of CAG repeats.
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