Journal of Neurology

, Volume 256, Issue 2, pp 203–212 | Cite as

Relationship between CAG repeat length and brain volume in premanifest and early Huntington’s disease

  • S. M. D. Henley
  • E. J. Wild
  • N. Z. Hobbs
  • R. I. Scahill
  • G. R. Ridgway
  • D. G. MacManus
  • R. A. Barker
  • N. C. Fox
  • S. J. Tabrizi
ORIGINAL COMMUNICATION

Abstract

Huntington’s disease (HD) is caused by an expanded CAG repeat on the gene encoding for the protein huntingtin. There are conflicting findings about the extent to which repeat length predicts signs of the disease or severity of disease progression in adults. This study examined the relationship between CAG repeat length and brain volume in a large cohort of pre- and post-motor onset HD gene carriers, using voxel-based morphometry (VBM), an approach which allowed us to investigate the whole brain without defining a priori regions of interest. We also used VBM to examine group differences between 20 controls, 21 premanifest, and 40 early HD subjects. In the 61 mutation-positive subjects higher CAG repeat length was significantly associated with reduced volume of the body of the caudate nucleus bilaterally, left putamen, right insula, right parahippocampal gyrus, right anterior cingulate, and right occipital lobe, after correcting for age. The group contrasts showed significant reduction in grey matter volume in the early HD group relative to controls in widespread cortical as well as subcortical areas but there was no evidence of difference between controls and premanifest subjects. Overall we have demonstrated that increased CAG repeat length is associated with atrophy in extra-striatal as well as striatal regions, which has implications for the monitoring of disease-modifying therapies in the condition.

Key words

Huntington’s disease voxel-based morphometry magnetic resonance imaging CAG 

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Copyright information

© Steinkopff-Verlag 2009

Authors and Affiliations

  • S. M. D. Henley
    • 1
    • 7
  • E. J. Wild
    • 1
  • N. Z. Hobbs
    • 1
  • R. I. Scahill
    • 1
  • G. R. Ridgway
    • 2
  • D. G. MacManus
    • 3
  • R. A. Barker
    • 4
  • N. C. Fox
    • 1
    • 5
  • S. J. Tabrizi
    • 5
    • 6
  1. 1.Dementia Research CentreInstitute of Neurology, University CollegeLondonUK
  2. 2.Centre for Medical Image ComputingUniversity CollegeLondonUK
  3. 3.NMR Research Unit, Institute of NeurologyUniversity CollegeLondonUK
  4. 4.Brain Repair Centre, Dept. of Clinical NeurosciencesAddenbrooke’s HospitalCambridgeUK
  5. 5.Dept. of Clinical NeurologyNational Hospital for Neurology and NeurosurgeryLondonUK
  6. 6.Dept. of Neurodegenerative Disease, Institute of NeurologyUniversity College LondonLondonUK
  7. 7.Dementia Research CentreNational Hospital for Neurology and NeurosurgeryLondonUK

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