UK and Italian scientists are getting closer to developing blood and urine tests for autism, which could lead to earlier diagnosis and treatment of the condition, a new study suggests. The tests look for damage to certain proteins, shown to be higher in children with autism spectrum disorders.
Advanced glycation endproducts, dityrosine and arginine transporter dysfunction in autism – a source of biomarkers for clinical diagnosis
Clinical chemistry tests for autism spectrum disorder (ASD) are currently unavailable. The aim of this study was to explore the diagnostic utility of proteotoxic biomarkers in plasma and urine, plasma protein glycation, oxidation, and nitration adducts, and related glycated, oxidized, and nitrated amino acids (free adducts), for the clinical diagnosis of ASD.
Thirty-eight children with ASD (29 male, 9 female; age 7.6 ± 2.0 years) and 31 age-matched healthy controls (23 males, 8 females; 8.6 ± 2.0 years) were recruited for this study. Plasma protein glycation, oxidation, and nitration adducts and amino acid metabolome in plasma and urine were determined by stable isotopic dilution analysis liquid chromatography-tandem mass spectrometry. Machine learning methods were then employed to explore and optimize combinations of analyte data for ASD diagnosis.
We found that children with ASD had increased advanced glycation endproducts (AGEs), Nε-carboxymethyl-lysine (CML) and Nω-carboxymethylarginine (CMA), and increased oxidation damage marker, dityrosine (DT), in plasma protein, with respect to healthy controls. We also found that children with ASD had increased CMA free adduct in plasma ultrafiltrate and increased urinary excretion of oxidation free adducts, alpha-aminoadipic semialdehyde and glutamic semialdehyde. From study of renal handling of amino acids, we found that children with ASD had decreased renal clearance of arginine and CMA with respect to healthy controls. Algorithms to discriminate between ASD and healthy controls gave strong diagnostic performance with features: plasma protein AGEs—CML, CMA—and 3-deoxyglucosone-derived hydroimidazolone, and oxidative damage marker, DT. The sensitivity, specificity, and receiver operating characteristic area-under-the-curve were 92%, 84%, and 0.94, respectively.
Changes in plasma AGEs were likely indicative of dysfunctional metabolism of dicarbonyl metabolite precursors of AGEs, glyoxal and 3-deoxyglucosone. DT is formed enzymatically by dual oxidase (DUOX); selective increase of DT as an oxidative damage marker implicates increased DUOX activity in ASD possibly linked to impaired gut mucosal immunity. Decreased renal clearance of arginine and CMA in ASD is indicative of increased arginine transporter activity which may be a surrogate marker of disturbance of neuronal availability of amino acids. Data driven combination of these biomarkers perturbed by proteotoxic stress, plasma protein AGEs and DT, gave diagnostic algorithms of high sensitivity and specificity for ASD.
Dr. Manish Bhatia
BHMS, BCA, M.Sc. Homeopathy (UCLAN, UK), CICH (IACH, Greece)
Dr. Manish Bhatia is the Founder Director of Hpathy.com, world’s leading homeopathy portal, serving homeopathy to more than half a million people every month. He is also Editor of Homeopathy for Everyone.
He runs a consultation office at Jaipur (Asha Homeopathy) and is one of the most well known Indian homeopaths globally. He has been practicing since 2001 and is helping Autism and other psychiatric patients since 2006. He was awarded Rajasthan’s foremost Raja Pajvan Dev Award For Excellence in the field of Medicine in 2015.
He has been working as an Asso. Professor of Organon of Medicine at S. K. Homeopathic Medical College since 2002. He was awarded with the prestigious APJ Abdul Kalam State Level Teacher’s Award in 2016. He has also given seminars and webinars in several countries of Europe, Americas and Australia.
He is the author of Lectures on Organon of Medicine Vol. I & II (English, Bulgarian, German editions), which are approved by the Central Council of Homeopathy (India) for BHMS and MD (Hom) syllabus. He is a contributing author to the book “Homeopathy and Mental Health Care: Integrative Practice, Principles and Research” and co-editor of “The Fireside Book of Homeopathy Tales.”