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Genetic variants in the MAP1B gene are linked to intellectual disability (ID) and lower IQ. Loss of MAP1B function causes significant white matter deficits in the brain, impacting cognitive abilities.

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Area of Science:

  • Neurogenetics
  • Developmental Neuroscience
  • Human Genetics

Background:

  • Identifying genetic risk factors is crucial for understanding neurodevelopmental disorders.
  • Microtubule-associated protein 1B (MAP1B) plays a role in neuronal development and function.

Purpose of the Study:

  • To investigate the association between genetic variants in MAP1B and neurodevelopmental disorders, specifically intellectual disability (ID) and low IQ.
  • To explore the impact of MAP1B variants on brain structure and white matter integrity.

Main Methods:

  • Whole-genome sequencing of 31,463 Icelandic individuals.
  • Association analysis of coding variants in MAP1B with ID and IQ.
  • Neuroimaging analysis (MRI) to assess white matter volume and fractional anisotropy.

Main Results:

  • A frameshift variant (E712KfsTer10) and stop-gain variants (E1032Ter, R1664Ter) in MAP1B were significantly associated with ID/low IQ.
  • MAP1B variant carriers exhibited reduced white matter (WM) volume (24%) and corpus callosum (CC) volume (47%).
  • Lower brain-wide fractional anisotropy was observed in carriers, indicating compromised white matter microstructure.

Conclusions:

  • Loss of function in MAP1B is implicated in intellectual disability and cognitive impairment.
  • MAP1B deficiency leads to significant, brain-wide white matter deficits, likely affecting axonal integrity.
  • These findings highlight MAP1B as a key gene in neurodevelopment and cognitive function.