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Complex Diagnostics of Non-Specific Intellectual Developmental Disorder.

Olga Levchenko1, Elena Dadali1, Ludmila Bessonova1

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Genetic testing reveals that hereditary factors cause over 35% of non-specific intellectual development disorder (IDD). Whole-exome sequencing is the most effective diagnostic tool for identifying these genetic causes in patients with IDD.

Keywords:
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Area of Science:

  • Genetics
  • Neuroscience
  • Developmental Biology

Background:

  • Intellectual development disorder (IDD) involves deficits in intellectual and adaptive functioning.
  • Non-specific IDD presents diagnostic challenges without advanced genetic analysis.
  • Understanding the genetic basis of IDD is crucial for accurate diagnosis and treatment.

Purpose of the Study:

  • To investigate the genetic architecture of non-specific IDD.
  • To determine the prevalence of hereditary forms of non-specific IDD.
  • To identify the most effective diagnostic methods for non-specific IDD.

Main Methods:

  • Whole-exome sequencing (WES) was performed on 198 patients with non-specific IDD.
  • Chromosome microarray analysis (CMA) was utilized in conjunction with WES.
  • Data from 171 families were analyzed to identify genetic variants.

Main Results:

  • Hereditary forms of IDD were identified in at least 35.7% of cases.
  • Monogenic forms of IDD accounted for 26.9% of hereditary cases.
  • Variants within genes of the BAF (SWI/SNF) complex were the most common genetic findings.

Conclusions:

  • Whole-exome sequencing is a highly efficient diagnostic method for non-specific IDD.
  • Clinical examination alone cannot differentiate between monogenic and microstructural chromosomal causes of IDD.
  • WES should be prioritized after standard examination for patients with non-specific IDD in Russia.