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Genetic testing using trio whole exome sequencing and copy number variation sequencing significantly improves the diagnosis rate for global developmental delay (GDD). This approach also sheds light on GDD pathogenesis and potential therapeutic targets, like the dopaminergic pathway.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Neurology

Background:

  • Global developmental delay (GDD) presents complex challenges in early diagnosis due to its diverse causes and symptoms.
  • Genetic factors play a crucial role in GDD, but their contribution is not fully understood.
  • Cognitive impairment is the primary symptom of GDD.

Purpose of the Study:

  • To evaluate the effectiveness of genetic testing in diagnosing GDD.
  • To explore the molecular mechanisms underlying GDD for early intervention strategies.
  • To identify potential therapeutic targets for GDD.

Main Methods:

  • A multicenter prospective cohort study involving 434 patients with GDD aged 12-60 months.
  • Utilized trio whole exome sequencing (trio-WES) combined with copy number variation sequencing (CNV-seq).
  • Employed bioinformatics analysis to investigate pathogenesis and identify therapeutic targets.

Main Results:

  • Achieved a 61% positive detection rate for genetic variants using the combined trio-WES and CNV-seq approach.
  • Identified associations between specific clinical features (craniofacial abnormalities, moderate/severe cognitive impairment, age 12-24 months) and a higher likelihood of carrying genetic variants.
  • Bioinformatics analysis suggested genetic variants impact brain development and function, potentially causing cognitive impairment, with a notable link to the dopaminergic pathway.

Conclusions:

  • Combining trio-WES and CNV-seq is an effective strategy for diagnosing GDD.
  • Established a link between genetic variations, brain development, and clinical phenotypes in GDD.
  • The dopaminergic pathway is a promising target for future precision medicine interventions in GDD.