Abstract：
OBJECTIVE:To describe the phenotype of individuals with intermediate allele (IA) CAG repeat length in the huntingtin (HTT) gene evaluated at the Parkinson's Disease Center and Movement Disorders Clinic (PDCMDC) at Baylor College of Medicine (BCM). BACKGROUND:Huntington disease (HD) is caused by a mutation in the HTT gene of 36 or more CAG trinucleotide repeats. Since our original case report of pathologically proven HD with 29 CAG repeats, a growing body of evidence has accumulated supporting the observation that individuals with IA (27 to 35 CAG repeats) may exhibit clinical, imaging, and pathologic manifestations of HD. About 6% of the general population has CAG repeats in the IA range in at least one allele of the HTT gene. The presence of IA is a challenge for genetic counseling. METHODS:Medical records of patients with IAs seen at the PDCMDC at BCM from January 2008 to the present were reviewed to assess age at symptom onset, dominant clinical features and presence of psychiatric and cognitive symptoms. RESULTS:Four men and five women were found to have IAs (range: 27-35) in the course of their evaluation at the PDCMDC. The age at onset of clinically evident symptoms ranged from 27 to 78 years. Six individuals had chorea, three had gait disturbance, two had stereotypies, and one patient had multiple motor tics. All nine had psychiatric symptoms, with depression being the most common. CONCLUSION:Our series of 9 individuals with IA in the HTT gene exhibit a variety of motor and non-motor features that overlap with the HD phenotype. These individuals and their offspring should be considered at risk for development of progressive HD.
journal_name
J Neurol Scijournal_title
Journal of the neurological sciencesauthors
Savitt D,Jankovic Jdoi
10.1016/j.jns.2019.05.010subject
Has Abstractpub_date
2019-07-15 00:00:00pages
57-61eissn
0022-510Xissn
1878-5883pii
S0022-510X(19)30226-6journal_volume
402pub_type
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journal_title：Journal of the neurological sciences
pub_type： 杂志文章
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