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Related Experiment Video

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Microstructural white matter tract alteration in Prader-Willi syndrome: A diffusion tensor imaging study.

Lauren J Rice1, Jim Lagopoulos1,2, Michael Brammer1,3

  • 1Brain and Mind Centre, University of Sydney, Camperdown, Australia.

American Journal of Medical Genetics. Part C, Seminars in Medical Genetics
|August 24, 2017
PubMed
Summary

Prader-Willi Syndrome (PWS) involves brain abnormalities. Diffusion tensor imaging revealed reduced white matter integrity in the left hemisphere of individuals with PWS, potentially explaining cognitive and behavioral issues.

Keywords:
PWSPrade-Willi syndromediffusion tensor imagingfractional anisotropywhite matter

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Area of Science:

  • Neuroimaging
  • Genetics
  • Neurology

Background:

  • Prader-Willi Syndrome (PWS) is a complex genetic disorder with significant neurological and behavioral manifestations.
  • The underlying brain mechanisms, particularly white matter alterations, remain poorly understood.
  • Previous neuroimaging studies in PWS have been limited in scope.

Purpose of the Study:

  • To investigate whole-brain microstructural white matter changes in individuals with Prader-Willi Syndrome using diffusion tensor imaging (DTI).
  • To correlate white matter integrity with known PWS-related dysfunctions.

Main Methods:

  • Utilized diffusion tensor imaging (DTI) and T1-weighted magnetic resonance imaging (MRI) in 15 individuals with PWS and 15 age/gender-matched controls.
  • Employed whole-brain, voxel-wise statistical analysis with tract-based spatial statistics (TBSS) to assess fractional anisotropy (FA).

Main Results:

  • Significantly reduced fractional anisotropy (FA) was observed in the left hemisphere of individuals with PWS.
  • Affected areas included the splenium of the corpus callosum, internal capsule (posterior thalamic radiation), and inferior frontal occipital fasciculus (IFOF).

Conclusions:

  • These findings suggest compromised white matter integrity in specific left-hemisphere pathways in PWS.
  • Reduced integrity in these tracts may underlie attention, emotion recognition, semantic processing, and sensorimotor deficits characteristic of PWS.