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The NuRD complex and macrocephaly associated neurodevelopmental disorders.

Tyler Mark Pierson1,2,3, Maria G Otero3, Katheryn Grand4

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PubMed
Summary

Mutations in the NuRD complex genes cause neurodevelopmental disorders with intellectual disability. These disorders, including GATAD2B-associated neurodevelopmental disorder (GAND), may form a new class of overgrowth and intellectual disability syndromes called NuRDopathies.

Keywords:
CHD3CHD4GATAD2BNuRD complexmacrocephaly

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Area of Science:

  • Genetics
  • Neurobiology
  • Molecular Biology

Background:

  • The nucleosome remodeling and deacetylase (NuRD) complex regulates gene expression crucial for development.
  • Mutations in NuRD components (CHD3, CHD4, GATAD2B) are linked to neurodevelopmental disorders with macrocephaly and intellectual disability, resembling overgrowth and intellectual disability (OGID) syndromes.
  • GATAD2B-associated neurodevelopmental disorder (GAND) shares features with CHD3 and CHD4 related disorders.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying neurodevelopmental disorders associated with NuRD complex gene mutations.
  • To explore the phenotypic overlap and potential classification of these disorders.
  • To understand how GATAD2B variants affect interactions within the NuRD complex.

Main Methods:

  • Analysis of genetic variants in CHD3, CHD4, and GATAD2B.
  • Review of clinical phenotypes associated with these variants.
  • Examination of structural models of the NuRD complex to understand protein interactions.

Main Results:

  • Pathogenic variants in CHD3 and CHD4 primarily disrupt enzymatic functions.
  • GATAD2B variants include loss-of-function mutations and missense variants affecting conserved domains (CR1, CR2).
  • Structural data suggest CHD3 and CHD4 interact with the GATAD2B-CR2 domain, implying GATAD2B variants may impair recruitment of these proteins to the NuRD complex.

Conclusions:

  • Phenotypic similarities between CHD3/CHD4 disorders and GAND support a shared mechanism involving impaired NuRD complex function.
  • The findings suggest a potential new class of OGID syndromes, termed NuRDopathies, characterized by mutations in NuRD complex genes.
  • Understanding these interactions is key to diagnosing and potentially treating these neurodevelopmental disorders.