Human Molecular Genetics, Vol 5, 1253-1257, Copyright © 1996 by Oxford University Press
F Tanaka, M Doyu, Y Ito, M Matsumoto, T Mitsuma, K Abe, M Aoki, Y Itoyama, KH Fischbeck and G Sobue
We analyzed the polymorphic (CAG)n and (GGC)n repeats of the androgen
receptor gene in 113 unrelated X-linked spinal and bulbar muscular atrophy
(SBMA) X chromosomes and 173 control X chromosomes in Japanese males. The
control chromosomes had an average CAG repeat number of 21 +/- 3 with a
range from 14-32 repeat units, and SBMA chromosomes had a range from 40-55
with a median of 47 +/- 3 copies. The control chromosomes had seven
different alleles of the (GGC)n repeat with the range of 11 to 17; the most
frequent size of (GGC)n was 16 (79%), while (GGC)17 was very rare (1%).
However, in SBMA chromosomes only two alleles were seen; the most frequent
size of (GGC)n was 16 (61%) followed by 17 (39%). (GGC)n size distribution
was significantly different between SBMA and control chromosomes (P <
0.0001), indicating the presence of linkage disequilibrium. There was no
allelic association between the (CAG)n and (GGC)n microsatellites among
control subjects as well as SBMA patients, which suggests that a founder
effect makes a more significant contribution to generation of Japanese SBMA
chromosomes than new mutations.
ARTICLES
Founder effect in spinal and bulbar muscular atrophy (SBMA)
Department of Neurology, Nagoya University School of Medicine, Japan.
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