title: Measurement of urine indolylacroylglycine is not useful in the diagnosis or dietary management of autism.
abstract: To measure urine indolylacroylglycine (IAG) excretion using the IAG:creatinine ratio in children with autism spectrum disorder (ASD) compared with two groups of age matched controls, one with special needs but without ASD (SEN) and one typically developing (TD) and in subgroups with/without current gastrointestinal problems and ASD with and without regression. IAG:creatinine ratio was measured in the urine of 279 children aged 10-14 years: 129 children with ASD (28 with and 101 without regression), 62 SEN controls and 88 TD controls. The prevalence of gastro-intestinal symptoms (GIS) was recorded. No differences were found in the urine IAG:creatinine ratio among groups ASD, TD and SEN; nor in the ASD groups with/without regression, nor in those with/without GIS. This study finds no evidence of increased urine IAG excretion in children with ASD, with or without GIS or with or without regression. Urinary IAG measurements in children with ASD offer no support for increased presence of neuroactive peptides proposed to result from increased gut permeability. We found measurement of urinary IAG to have no value in the diagnosis of autism or in the dietary management of children with ASD. Autism Res 2017, 10: 408-413. © 2016 International Society for Autism Research, Wiley Periodicals, Inc.
authors: WellChild Laboratory, Evelina London Children's Hospital & King's College London, London, UK.
authors: Neil R
authors: NR
authors: Dalton
authors: Paediatric Neurosciences, Newcomen Centre, Guy's & St Thomas' NHS Foundation Trust, London, UK.|Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK.
authors: Susie
authors: S
authors: Chandler
authors: WellChild Laboratory, Evelina London Children's Hospital & King's College London, London, UK.
authors: Charles
authors: C
authors: Turner
authors: Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK.
authors: Tony
authors: T
authors: Charman
authors: Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK.
authors: Andrew
authors: A
authors: Pickles
authors: Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, UK.
authors: Emily
authors: E
authors: Simonoff
authors: Paediatric Neurosciences, Newcomen Centre, Guy's & St Thomas' NHS Foundation Trust, London, UK.
authors: Gillian
authors: G
authors: Baird
mesh_terms: D000293:Adolescent; D000067877:Autism Spectrum Disorder / Q000150:complications* / Q000652:urine*; D002648:Child; D005260:Female; D005767:Gastrointestinal Diseases / Q000150:complications / Q000178:diet therapy* / Q000652:urine*; D005998:Glycine / Q000031:analogs & derivatives* / Q000652:urine; D006801:Humans; D008297:Male
chemical_list: C001807:indolylacryloylglycine; D005998:Glycine
keywords: autism; gastrointestinal; indoleacroylglycine; regression