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So Fragile, So Human: Noncoding DNA Regions Orchestrating Gene Expression Involved in Neurodevelopmental Disorders

Carolina Marenco1, Giorgia Pozzolini1, Martina Casciaro2

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Summary
This summary is machine-generated.

Human Accelerated DNA Regions (HARs) and their 3D interactions are key to brain evolution and neurodevelopmental disorders (NDDs). Variants in HARs, particularly those involving SOX2, are linked to autism spectrum disorders (ASDs).

Keywords:
SOX2autismbrain developmentgene regulationgene regulatory networksnervous systemneurodevelopmental disorderstranscription factors

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Area of Science:

  • Genetics and Neuroscience
  • Evolutionary Biology
  • Genomic Regulation

Background:

  • Gene expression during human brain development relies on a dynamic 3D network of non-protein-coding DNA, including promoters and enhancers.
  • Neurodevelopmental disorders (NDDs), such as autism spectrum disorders (ASDs), are increasingly linked to variations in these regulatory DNA sequences.

Purpose of the Study:

  • To explore novel perspectives on how DNA sequence variants in regulatory elements contribute to NDDs.
  • To connect the evolution of Human Accelerated DNA Regions (HARs) with their role in brain development and NDDs.
  • To investigate the role of the SOX2 transcription factor in gene regulatory networks associated with NDDs and brain evolution.

Main Methods:

  • Analysis of whole-genome sequencing (WGS) data to identify DNA sequence variants in regulatory regions.
  • Review of recent models on the evolution of HARs and their involvement in 3D genome interactions.
  • Examination of the binding interactions of SOX2 and FOS transcription factors with regulatory DNA, including HARs.

Main Results:

  • Human Accelerated DNA Regions (HARs) are implicated in the evolution of human brain features through 3D network participation.
  • Rare, recessive variants within HARs interacting with target genes in neural cells are potential risk factors for ASDs.
  • SOX2 shapes the noncoding DNA interaction network and binds to HARs with human-specific substitutions and ASD-associated mutations.

Conclusions:

  • SOX2-dependent gene regulatory networks are crucial for understanding the link between NDDs and brain evolution.
  • Further research into SOX2, HARs, and 3D genome interactions can improve our understanding of NDDs.
  • Investigating regulatory DNA variants offers insights into the genetic architecture of neurodevelopment and evolution.