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Epigenetic dysregulation in the developing Down syndrome cortex.

Nady El Hajj1, Marcus Dittrich1,2, Julia Böck1

  • 1a Institute of Human Genetics, Julius Maximilians University , Würzburg , Germany.

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|June 2, 2016
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Summary
This summary is machine-generated.

Fetal Down syndrome (DS) brain shows widespread DNA hypermethylation, particularly affecting genes outside chromosome 21, like the protocadherin gamma (PCDHG) cluster. This epigenetic dysregulation impacts neural development and may offer therapeutic targets.

Keywords:
DNA methylationDown syndromefetal brain developmentfrontal cortexprotocadherin gamma cluster

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Area of Science:

  • Epigenetics
  • Neurodevelopmental Biology
  • Genomics

Background:

  • Down syndrome (DS) is associated with altered gene expression in the brain.
  • Epigenetic modifications, such as DNA methylation, are implicated in developmental disorders.

Purpose of the Study:

  • To investigate genome-wide DNA methylation patterns in the fetal Down syndrome (DS) cortex.
  • To identify specific genes and pathways affected by aberrant methylation in DS.

Main Methods:

  • Illumina 450K methylation arrays for genome-wide CpG site analysis.
  • Bisulfite pyrosequencing and targeted RNA sequencing for validation.

Main Results:

  • Significant genome-wide DNA hypermethylation observed in fetal DS cortex, with 1.85% of CpG sites affected.
  • Chromosome 21 methylation changes were balanced, while other chromosomes showed a marked excess of hypermethylation.
  • The protocadherin gamma (PCDHG) cluster on chromosome 5q31 was hypermethylated and transcriptionally downregulated in DS.
  • Downregulation of PCDHG genes is linked to reduced dendrite growth in cortical neurons.

Conclusions:

  • Aberrant DNA methylation, particularly hypermethylation of key developmental genes like PCDHG, contributes to neurodevelopmental alterations in Down syndrome.
  • These widespread methylation changes may serve as biomarkers for DS brain development and potential targets for therapeutic interventions.