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Pathogenic UNC13A variants cause a neurodevelopmental syndrome by impairing synaptic function.

Reza Asadollahi1,2, Aisha Ahmad3,4, Paranchai Boonsawat5

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Genetic variants in the UNC13A gene cause a neurodevelopmental syndrome with intellectual disability and movement disorders. This research identifies three ways UNC13A gene mutations disrupt neuron communication, leading to disease.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Biology

Background:

  • The UNC13A gene encodes a presynaptic protein vital for neuronal communication.
  • Dysregulation of UNC13A function is implicated in neurological disorders.

Purpose of the Study:

  • To investigate the genetic basis and molecular mechanisms of a neurodevelopmental syndrome linked to UNC13A variants.
  • To establish genotype-phenotype-functional correlations for classifying UNC13A syndrome subtypes.

Main Methods:

  • Analysis of germline coding and splice-site variants in UNC13A.
  • Functional assays using UNC13A variants in mouse hippocampal neurons and Caenorhabditis elegans.
  • Assessment of neurotransmission strength, dynamics, and second messenger signaling regulation.

Main Results:

  • Identified a neurodevelopmental syndrome characterized by developmental delay, intellectual disability, seizures, movement disorders, and early childhood death.
  • Uncovered three pathogenic mechanisms: reduced protein expression, gain-of-function leading to increased neurotransmission, and impaired second messenger regulation.
  • Classified three UNC13A syndrome subtypes (A-C) based on genotype-phenotype-functional correlations.

Conclusions:

  • Germline UNC13A variants cause a spectrum of neurodevelopmental and neurological abnormalities.
  • Precise regulation of neurotransmitter release by UNC13A is essential for normal human nervous system function.
  • Understanding UNC13A's role provides insights into synaptic function and neurodevelopmental disorders.