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Genome sequencing for rightward hemispheric language dominance.

Amaia Carrion-Castillo1, Lise Van der Haegen2, Nathalie Tzourio-Mazoyer3

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Rare genetic mutations may influence rightward hemispheric language dominance (RHLD). A study found increased actin cytoskeleton gene mutations in RHLD individuals, offering initial insights into language laterality genetics.

Keywords:
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Area of Science:

  • Neurogenetics
  • Human Genetics
  • Developmental Neuroscience

Background:

  • Most individuals exhibit left-hemisphere dominance for language.
  • Rightward hemispheric language dominance (RHLD) is rare, affecting about 1% of adults.
  • The genetic basis for typical and atypical language laterality remains largely unknown.

Purpose of the Study:

  • To investigate the potential role of rare, strongly penetrant genetic mutations in RHLD.
  • To explore genetic factors underlying atypical hemispheric language dominance.

Main Methods:

  • Whole-genome sequencing of 33 RHLD subjects and 34 controls.
  • Analysis of genetic data against population datasets.
  • Exploration of hypotheses derived from invertebrate development.

Main Results:

  • No single rare gene mutation was found in a significant proportion of RHLD cases compared to controls.
  • An increased mutation load was detected in RHLD subjects within genes of the actin cytoskeleton.
  • This finding suggests a potential link between actin-related genes and RHLD.

Conclusions:

  • The study did not identify strong monogenic causes for RHLD.
  • Atypical language dominance may involve complex genetic factors, including mutations in actin cytoskeleton genes.
  • This research provides a preliminary understanding of the molecular genetic influences on hemispheric language dominance.