Gastrointestinal dysfunction in patients and mice expressing the autism‐associated R451C mutation in neuroligin‐3

Hosie, S. et al. (2019) Gastrointestinal dysfunction in patients and mice expressing the autism‐associated R451C mutation in neuroligin‐3. Autism Research, 12(7), pp. 1043-1056. (doi: 10.1002/aur.2127) (PMID:31119867) (PMCID:PMC6606367)

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Gastrointestinal (GI) problems constitute an important comorbidity in many patients with autism. Multiple mutations in the neuroligin family of synaptic adhesion molecules are implicated in autism, however whether they are expressed and impact GI function via changes in the enteric nervous system is unknown. We report the GI symptoms of two brothers with autism and an R451C mutation in Nlgn3 encoding the synaptic adhesion protein, neuroligin‐3. We confirm the presence of an array of synaptic genes in the murine GI tract and investigate the impact of impaired synaptic protein expression in mice carrying the human neuroligin‐3 R451C missense mutation (NL3R451C). Assessing in vivo gut dysfunction, we report faster small intestinal transit in NL3R451C compared to wild‐type mice. Using an ex vivo colonic motility assay, we show increased sensitivity to GABAA receptor modulation in NL3R451C mice, a well‐established Central Nervous System (CNS) feature associated with this mutation. We further show increased numbers of small intestine myenteric neurons in NL3R451C mice. Although we observed altered sensitivity to GABAA receptor modulators in the colon, there was no change in colonic neuronal numbers including the number of GABA‐immunoreactive myenteric neurons. We further identified altered fecal microbial communities in NL3R451C mice. These results suggest that the R451C mutation affects small intestinal and colonic function and alter neuronal numbers in the small intestine as well as impact fecal microbes. Our findings identify a novel GI phenotype associated with the R451C mutation and highlight NL3R451C mice as a useful preclinical model of GI dysfunction in autism.

Item Type:Articles
Additional Information:This work was supported by an Idea Development Award from the United States Department of Defense’s Congressionally Directed Medical Research Programs (CDMRP) Autism Research Program (AR110134) to E.L.H.-Y. and J.C.B.; the Victorian Government through the Operational Infrastructure Scheme, National Health and Medical Research Council (NHMRC) project grants (APP566642 to J.C.B. and APP1047674 to E.L.H.-Y.) and the Royal Melbourne Hospital Neuroscience Foundation. E.L.H.-Y. also received an ARC Future Fellowship (FT160100126) and an RMIT Vice Chancellor’s Senior Research Fellowship which supported G.K.B. and S.H. T.S., P.U., and N.Y. were funded by grants RO1AI100914, P30-DK56338, and U01-AI24290 awards to Baylor College of Medicine funded from the National Institute of Allergy and Infectious Diseases and National Institute of Diabetes and Digestive and Kidney Diseases at the National Institutes of Health (T.C.S.)
Glasgow Author(s) Enlighten ID:Gillberg, Professor Christopher
Authors: Hosie, S., Ellis, M., Swaminathan, M., Ramalhosa, F., Seger, G. O., Balasuriya, G. K., Gillberg, C., Råstam, M., Churilov, L., McKeown, S. J., Yalcinkaya, N., Urvil, P., Savidge, T., Bell, C. A., Bodin, O., Wood, J., Franks, A. E., Bornstein, J. C., and Hill‐Yardin, E. L.
College/School:College of Medical Veterinary and Life Sciences > School of Health & Wellbeing > Mental Health and Wellbeing
Journal Name:Autism Research
ISSN (Online):1939-3806
Published Online:22 May 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Autism Research 12(7):1043-1056
Publisher Policy:Reproduced under a Creative Commons License

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