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Related Experiment Video

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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity

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MAOA genotype modulates default mode network deactivation during inhibitory control.

Ren Ma¹, Gabriela Gan², Jibiao Zhang¹

¹Medical Psychological Institute, The Second Xiangya Hospital, Central South University, Changsha, Hunan, PR China.

Biological Psychology

|August 10, 2018

Summary

This summary is machine-generated.

The low-activity monoamine oxidase A (MAOA) genotype in adolescent males is linked to greater default mode network (DMN) suppression during inhibitory control tasks. This suggests a potential compensatory brain mechanism for cognitive control.

Keywords:

Aggression Default mode network Inhibitory control MAOA gene

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Area of Science:

Neuroscience
Genetics
Developmental Psychology

Background:

The low-activity monoamine oxidase A (MAOA) genotype is associated with aggression.
Impaired response inhibition is linked to aggression, but its connection to the MAOA-aggression relationship in adolescents is unclear.

Purpose of the Study:

To investigate how MAOA genotype influences the neural mechanisms of inhibitory control in healthy male adolescents.
To differentiate between action cancelation and action restraint within cognitive control tasks.

Main Methods:

Utilized GoStop and Go/Nogo tasks in 74 healthy male adolescents.
Compared neural activation patterns between carriers of low-expressing MAOA alleles (MAOA-L) and high-expressing alleles.
Analyzed brain activity in prefrontal-subcortical inhibition networks and default mode network (DMN) regions.

Main Results:

No significant differences in prefrontal-subcortical network activation were found between MAOA genotype groups during inhibition.
MAOA-L carriers showed more pronounced deactivation in the posterior cingulate cortex (PCC) and precuneus (DMN regions) during response inhibition.
A larger suppression of DMN activity was observed in MAOA-L carriers.

Conclusions:

MAOA genotype does not appear to alter core prefrontal-subcortical inhibitory control network activation in adolescents.
Enhanced DMN suppression in MAOA-L carriers may serve as a compensatory mechanism for cognitive control deficits.
Findings contribute to understanding the neurogenetic underpinnings of aggression and inhibitory control in adolescent males.