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Genetic variants in Rps4x cause intellectual disability with dysmorphic features, microcephaly, and autism.

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Researchers identified a new genetic cause of X-linked intellectual disability (XLID) linked to the RPS4X gene. This discovery expands our understanding of genetic disorders affecting cognitive function and highlights the role of ribosomal components in disease.

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Area of Science:

  • Genetics
  • Neuroscience
  • Molecular Biology

Background:

  • X-linked intellectual disability (XLID) is a group of disorders causing cognitive impairment and developmental delays.
  • Genetic variants in 172 genes are currently linked to XLID, affecting approximately 10% of X-chromosome genes.
  • XLID presentations are clinically variable, ranging from multi-system disorders to isolated intellectual impairment.

Purpose of the Study:

  • To identify novel genetic causes of X-linked intellectual disability.
  • To investigate the role of the RPS4X gene in neurodevelopmental disorders.
  • To characterize the pathogenicity of RPS4X variants in affected individuals.

Main Methods:

  • Genetic testing of affected individuals and family members.
  • Functional studies using patient-derived fibroblasts and zebrafish models.
  • Analysis of data from large-scale genetic databases (GeneMatcher, 100,000 Genomes project).

Main Results:

  • A maternally inherited missense variant in RPS4X was identified in two siblings with XLID.
  • Functional studies confirmed the pathogenicity of the RPS4X variant, consistent with clinical symptoms.
  • Four additional individuals with intellectual disability and RPS4X variants were identified, supporting its role in XLID.

Conclusions:

  • RPS4X is identified as a novel gene associated with X-linked intellectual disability.
  • Defects in RPS4X, encoding a ribosomal protein, contribute to intellectual disability and developmental delays.
  • This finding expands the spectrum of known genetic diseases linked to ribosomal dysfunction.