Dementia in Down's syndrome: an MRI comparison with Alzheimer's disease in the general population

Diane Mullins*, Eileen Daly, Andrew Simmons, Felix Beacher, Catherine M. L. Foy, Simon Lovestone, Brian Hallahan, Kieran C. Murphy, Declan G. Murphy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Background: Down's syndrome (DS) is the most common genetic cause of intellectual disability. People with DS are at an increased risk of Alzheimer's disease (AD) compared to the general population. Neuroimaging studies of AD have focused on medial temporal structures; however, to our knowledge, no in vivo case-control study exists comparing the anatomy of dementia in DS to people with AD in the general population. We therefore compared the in vivo brain anatomy of people with DS and dementia (DS+) to those with AD in the general population.

Method: Using MRI in 192 adults, we compared the volume of whole brain matter, lateral ventricles, temporal lobes and hippocampus in DS subjects with and without dementia (DS+, DS-), to each other and to three non-DS groups. These included one group of individuals with AD and two groups of controls (each age-matched for their respective DS and general population AD cohorts).

Results: AD and DS+ subjects showed significant reductions in the volume of the whole brain, hippocampus and temporal lobes and a significant elevation in the volume of the lateral ventricle, compared to their non-demented counterparts. People with DS+ had a smaller reduction in temporal lobe volume compared to individuals with AD.

Conclusions: DS+ and AD subjects have a significant reduction in volume of the same brain regions. We found preliminary evidence that DS individuals may be more sensitive to tissue loss than others and have less 'cognitive reserve'.

Original languageEnglish
Article number19
Pages (from-to)N/A
Number of pages13
JournalJournal Of Neurodevelopmental Disorders
Volume5
Issue numberN/A
DOIs
Publication statusPublished - 20 Aug 2013

Keywords

  • Dementia
  • Imaging
  • Intellectual disability
  • MILD COGNITIVE IMPAIRMENT
  • MEDIAL TEMPORAL-LOBE
  • MAGNETIC-RESONANCE SPECTROSCOPY
  • VOXEL-BASED MORPHOMETRY
  • IN-VIVO MRI
  • HIPPOCAMPAL-FORMATION
  • NONDEMENTED ADULTS
  • BRAIN ATROPHY
  • MEMORY FUNCTION
  • VOLUMETRIC MRI
  • Acknowledged-BRU
  • Acknowledged-BRU-13/14
  • Acknowledged-BRC

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