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Early White Matter Microstructure Alterations in Infants with Down Syndrome.

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Infants with Down syndrome show delayed white matter development, particularly in key association tracts. This study reveals early neurodevelopmental differences in Down syndrome, potentially guiding future interventions.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Down syndrome (trisomy 21) is the most common chromosomal disorder, leading to intellectual disability.
  • Early brain development, especially white matter microstructure, is significantly impacted, yet research in infants is limited.

Purpose of the Study:

  • To investigate early white matter microstructure in infants with Down syndrome.
  • Utilize advanced neuroimaging techniques, including diffusion tensor imaging (DTI) and neurite orientation dispersion and density imaging (NODDI).

Main Methods:

  • Prospective cohort study involving infants with and without Down syndrome.
  • Scanned 49 infants with Down syndrome and 37 controls at 6 months of age using DTI and NODDI.
  • Analyzed white matter microstructure in association tracts and optic tracts.

Main Results:

  • Infants with Down syndrome exhibited reduced fractional anisotropy and neurite density in major association tracts, indicating compromised structural integrity and delayed myelination.
  • Increased orientation dispersion index in specific tracts suggested altered neurite organization.
  • Optic tracts showed a unique pattern of accelerated maturation in Down syndrome infants.

Conclusions:

  • This study provides the first comprehensive characterization of white matter microstructure in infants with Down syndrome.
  • Findings reveal widespread delays in white matter development, offering crucial insights into early neurodevelopmental trajectories.
  • Results may inform the development of targeted early therapeutic interventions for Down syndrome.