Pm. Bingham et al., STABILITY OF AN EXPANDED TRINUCLEOTIDE REPEAT IN THE ANDROGEN RECEPTOR GENE IN TRANSGENIC MICE, Nature genetics, 9(2), 1995, pp. 191-196
The expansion of trinucleotide repeat sequences underlies a number of
hereditary neurological disorders. To study the stability of a trinucl
eotide repeat and to develop an animal model of one of these disorders
, spinal and bulbar muscular atrophy (SBMA), we have generated transge
nic mice carrying either the normal or expanded repeat human androgen
receptor (AR) gene. Unlike the disease allele in humans, the AR cDNA c
ontaining the expanded repeat in transgenic mice showed no change in r
epeat length with transmission. Expression of the SBMA AR was,found in
transgenic mice, but at a lower level than normal endogenous expressi
on. The lack of a physiological pattern of expression may explain why
no phenotypic effects of the transgene were observed.