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Molecular Autism
Published in: Molecular Autism 1/2018

Open Access 01-12-2018 | Research

Network-specific sex differentiation of intrinsic brain function in males with autism

Authors: Dorothea L. Floris, Meng-Chuan Lai, Tanmay Nath, Michael P. Milham, Adriana Di Martino

Published in: Molecular Autism | Issue 1/2018

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Abstract

Background

The male predominance in the prevalence of autism spectrum disorder (ASD) has motivated research on sex differentiation in ASD. Multiple sources of evidence have suggested a neurophenotypic convergence of ASD-related characteristics and typical sex differences. Two existing, albeit competing, models provide predictions on such neurophenotypic convergence. These two models are testable with neuroimaging. Specifically, the Extreme Male Brain (EMB) model predicts that ASD is associated with enhanced brain maleness in both males and females with ASD (i.e., a shift-towards-maleness). In contrast, the Gender Incoherence (GI) model predicts a shift-towards-maleness in females, yet a shift-towards-femaleness in males with ASD.

Methods

To clarify whether either model applies to the intrinsic functional properties of the brain in males with ASD, we measured the statistical overlap between typical sex differences and ASD-related atypicalities in resting-state fMRI (R-fMRI) datasets largely available in males. Main analyses focused on two large-scale R-fMRI samples: 357 neurotypical (NT) males and 471 NT females from the 1000 Functional Connectome Project and 360 males with ASD and 403 NT males from the Autism Brain Imaging Data Exchange.

Results

Across all R-fMRI metrics, results revealed coexisting, but network-specific, shift-towards-maleness and shift-towards-femaleness in males with ASD. A shift-towards-maleness mostly involved the default network, while a shift-towards-femaleness mostly occurred in the somatomotor network. Explorations of the associated cognitive processes using available cognitive ontology maps indicated that higher-order social cognitive functions corresponded to the shift-towards-maleness, while lower-order sensory motor processes corresponded to the shift-towards-femaleness.

Conclusions

The present findings suggest that atypical intrinsic brain properties in males with ASD partly reflect mechanisms involved in sexual differentiation. A model based on network-dependent atypical sex mosaicism can synthesize prior competing theories on factors involved in sex differentiation in ASD.
Appendix
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Metadata
Title
Network-specific sex differentiation of intrinsic brain function in males with autism
Authors
Dorothea L. Floris
Meng-Chuan Lai
Tanmay Nath
Michael P. Milham
Adriana Di Martino
Publication date
01-12-2018
Publisher
BioMed Central
Published in
Molecular Autism / Issue 1/2018
Electronic ISSN: 2040-2392
DOI
https://doi.org/10.1186/s13229-018-0192-x

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