Exome sequencing in four families with neurodevelopmental disorders: genotype-phenotype correlation and identification of novel disease-causing variants in VPS13B and RELN

Mol Genet Genomics. 2024 May 21;299(1):55. doi: 10.1007/s00438-024-02149-y.


Neurodevelopmental disorders (NDDs) are a clinically and genetically heterogeneous group of early-onset pediatric disorders that affect the structure and/or function of the central or peripheral nervous system. Achieving a precise molecular diagnosis for NDDs may be challenging due to the diverse genetic underpinnings and clinical variability. In the current study, we investigated the underlying genetic cause(s) of NDDs in four unrelated Pakistani families. Using exome sequencing (ES) as a diagnostic approach, we identified disease-causing variants in established NDD-associated genes in all families, including one hitherto unreported variant in RELN and three recurrent variants in VPS13B, DEGS1, and SPG11. Overall, our study highlights the potential of ES as a tool for clinical diagnosis.

Keywords: Exome sequencing; Mutation screening; Neurodevelopmental disorders.

MeSH terms

  • Cell Adhesion Molecules, Neuronal / genetics
  • Child
  • Child, Preschool
  • Exome / genetics
  • Exome Sequencing*
  • Female
  • Genetic Association Studies* / methods
  • Genetic Predisposition to Disease
  • Humans
  • Male
  • Mutation
  • Neurodevelopmental Disorders* / genetics
  • Pakistan
  • Pedigree*
  • Vesicular Transport Proteins* / genetics


  • VPS13B protein, human