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Genotype-phenotype correlations and putative modifier genes in SYNGAP1 Encephalopathy.

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Genetic variants in the SYNGAP1 gene cause SYNGAP1 Encephalopathy. Variant location and other genetic factors influence disease severity and clinical presentation in patients.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • Synaptic Ras GTPase-Activating Protein 1 (SynGAP), encoded by the SYNGAP1 gene, is crucial for synaptic plasticity, neurodevelopment, and neuronal function.
  • Pathogenic variants in SYNGAP1 cause SYNGAP1 Encephalopathy, a neurodevelopmental disorder with variable symptoms including intellectual disability, epilepsy, and autistic traits.
  • Current understanding of genotype-phenotype correlations in SYNGAP1 Encephalopathy is limited, hindering personalized treatment strategies.

Purpose of the Study:

  • To investigate the impact of SYNGAP1 gene variants and potential genetic modifiers on the clinical features of SYNGAP1 Encephalopathy.
  • To identify novel pathogenic SYNGAP1 variants associated with the disorder.
  • To explore how variant location and additional genetic factors contribute to phenotypic heterogeneity.

Main Methods:

  • Analysis of a cohort of 44 extensively phenotyped cases with SYNGAP1 Encephalopathy.
  • Genetic analysis to identify variants in SYNGAP1 and related genes.
  • Correlation of genetic findings with detailed clinical characteristics.

Main Results:

  • Identification of four previously unreported likely pathogenic SYNGAP1 variants.
  • Patients with variants in the SynGAP PH domain showed milder phenotypes compared to others.
  • Individuals with rare or low-frequency variants in SYNGAP1-related genes exhibited greater global disease severity.

Conclusions:

  • The location of SYNGAP1 variants plays a role in determining the clinical presentation of SYNGAP1 Encephalopathy.
  • Additional genetic modifiers likely contribute to the variability in disease severity and clinical manifestations.
  • Further research with larger cohorts and functional studies is necessary to refine genotype-phenotype correlations and develop personalized management approaches.