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Depressive Disorders: Etiology01:27

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Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
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White matter microstructure in boys with persistent depressive disorder.

Veronika Vilgis1, Alasdair Vance2, Ross Cunnington3

  • 1Developmental Imaging, Murdoch Childrens Research Institute, Parkville, Australia; Academic Child Psychiatry Unit, Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Parkville, Australia; UC Davis Center for Mind and Brain, Davis, CA, USA.

Journal of Affective Disorders
|June 20, 2017
PubMed
Summary

Children with persistent depressive disorder show differences in white matter tracts, specifically lower fractional anisotropy (FA). This finding in pediatric depression suggests altered brain structure may contribute to ongoing symptoms.

Keywords:
ChildrenDepressionDiffusion weighted imagingFractional anisotropyMRIPediatricWhite matter

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Area of Science:

  • Neuroscience
  • Child and Adolescent Psychiatry
  • Developmental Psychology

Background:

  • Persistent depressive symptoms in youth are a risk factor for adult major depressive disorder (MDD).
  • Previous studies indicate white matter microstructure alterations in pediatric MDD, but findings on specific affected tracts are inconsistent.
  • This study addresses discrepancies by examining white matter integrity in children with mild, chronic depressive symptoms.

Purpose of the Study:

  • To investigate white matter microstructure in children with persistent depressive disorder.
  • To determine if lower fractional anisotropy (FA) findings replicate in this pediatric population.
  • To explore the relationship between white matter integrity and depressive symptom severity.

Main Methods:

  • Utilized Diffusion Tensor Imaging - ToolKit (DTI-TK) for tract-specific analysis.
  • Examined white matter microstructure in 25 boys with persistent depressive disorder and 25 typically developing controls.
  • Assessed fractional anisotropy (FA) across eleven major white matter tracts.

Main Results:

  • Found significantly lower FA in clusters within the left uncinate, inferior fronto-occipital, and cerebrospinal tracts in the clinical group.
  • Observed a negative association between FA in the left uncinate tract and self-reported depressive symptoms.
  • Identified specific white matter tracts affected by persistent depressive disorder in children.

Conclusions:

  • Children with persistent depressive disorder exhibit reduced FA in several key white matter tracts.
  • These microstructural alterations support the link between early-onset depression and compromised brain development.
  • Altered white matter integrity may play a role in the persistence and recurrence of depressive symptoms.