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Examining Procedural Learning and Corticostriatal Pathways for Individual Differences in Language: Testing
Joanna C Lee1, Kathryn L Mueller1, J Bruce Tomblin1
1Department of Communication Sciences and Disorders, University of Iowa, Iowa City, IA, USA.
Language, Cognition and Neuroscience
|November 27, 2019
Summary
Genetic variations in the dopaminergic system are linked to procedural learning and brain pathways in developmental language impairment (DLI). These endophenotypes may help identify genes associated with DLI.
Area of Science:
- Neuroscience
- Genetics
- Developmental Disorders
Background:
- Developmental language impairment (DLI) has complex genetic underpinnings.
- The dopaminergic system and corticostriatal pathways are implicated in learning and cognitive functions.
Purpose of the Study:
- To investigate the association between genetic variations in the dopaminergic system and endophenotypes (procedural learning, corticostriatal pathways) in individuals with DLI.
- To determine if these endophenotypes are more sensitive to genetic effects than the language phenotype itself.
Main Methods:
- Genotyping of two single nucleotide polymorphisms (SNPs) in the DRD2/ANKK1 gene complex.
- Assessment of procedural learning abilities.
- Analysis of corticostriatal pathway structure (basal ganglia, caudate nucleus).
- Statistical association testing between genetic variations, DLI, and endophenotypes.
Main Results:
- Individuals with DLI exhibited deficits in procedural learning and abnormal basal ganglia structures.
- DRD2/ANKK1 genetic variations were significantly associated with procedural learning and caudate nucleus microstructural differences.
- No significant direct association was found between DRD2/ANKK1 polymorphisms and the language phenotype of DLI.
- A significant association was observed between the DLI phenotype and the studied endophenotypes.
Conclusions:
- Procedural learning and corticostriatal pathways serve as valuable endophenotypes for DLI.
- These endophenotypes can enhance molecular genetic studies aimed at identifying genes predisposing to DLI.
- Targeting the dopaminergic system may offer insights into the neurobiological basis of DLI.
Keywords:
Corticostriatal PathwaysDRD2/ANKK1Developmental Language ImpairmentEndophenotypeProcedural LearningMore Related Videos
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