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Functional brain abnormalities associated with comorbid anxiety in autism spectrum disorder

Published online by Cambridge University Press:  09 November 2020

James Bartolotti ,
John A. Sweeney  and
Matthew W. Mosconi
James Bartolotti
Affiliation:
Schiefelbusch Institute for Life Span Studies, University of Kansas, Lawrence, KS, USA Kansas Center for Autism Research and Training, University of Kansas Medical School, Kansas City, KS, USA
John A. Sweeney
Affiliation:
Department of Psychiatry, University of Cincinnati, Cincinnati, OH, USA
Matthew W. Mosconi*
Affiliation:
Schiefelbusch Institute for Life Span Studies, University of Kansas, Lawrence, KS, USA Kansas Center for Autism Research and Training, University of Kansas Medical School, Kansas City, KS, USA Clinical Child Psychology Program, University of Kansas, Lawrence, KS, USA
*
Author for Correspondence: Dr Matthew W. Mosconi, Life Span Institute, Kansas Center for Autism Research and Training (K-CART), Clinical Child Psychology Program, University of Kansas, 1000 Sunnyside Ave., Lawrence, KS, 66045, USA. E-mail: mosconi@ku.edu.
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Abstract

Anxiety disorders are common in autism spectrum disorder (ASD) and associated with social–communication impairment and repetitive behavior symptoms. The neurobiology of anxiety in ASD is unknown, but amygdala dysfunction has been implicated in both ASD and anxiety disorders. Using resting-state functional magnetic resonance imaging, we compared amygdala–prefrontal and amygdala–striatal connections across three demographically matched groups studied in the Autism Brain Imaging Data Exchange (ABIDE): ASD with a comorbid anxiety disorder (N = 25; ASD + Anxiety), ASD without a comorbid disorder (N = 68; ASD-NoAnx), and typically developing controls (N = 139; TD). Relative to ASD-NoAnx and TD controls, ASD + Anxiety individuals had decreased connectivity between the amygdala and dorsal/rostral anterior cingulate cortex (dACC/rACC). The functional connectivity of these connections was not affected in ASD-NoAnx, and amygdala connectivity with ventral ACC/medial prefrontal cortex (mPFC) circuits was not different in ASD + Anxiety or ASD-NoAnx relative to TD. Decreased amygdala–dorsomedial prefrontal cortex (dmPFC)/rACC connectivity was associated with more severe social impairment in ASD + Anxiety; amygdala–striatal connectivity was associated with restricted, repetitive behavior (RRB) symptom severity in ASD-NoAnx individuals. These findings suggest comorbid anxiety in ASD is associated with disrupted emotion-monitoring processes supported by amygdala–dACC/mPFC pathways, whereas emotion regulation systems involving amygdala–ventromedial prefrontal cortex (vmPFC) are relatively spared. Our results highlight the importance of accounting for comorbid anxiety for parsing ASD neurobiological heterogeneity.

Keywords

amygdalaanxietyautismcomorbid disordersfunctional connectivity

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Type
Special Section Articles
Information
Development and Psychopathology , Volume 32 , Special Issue 4: Conceptualizing and Interrogating Autism Spectrum Disorder from a Developmental Psychopathology Framework , October 2020 , pp. 1273 - 1286
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Copyright © The Author(s), 2020. Published by Cambridge University Press

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