J Psychiatry Neurosci 2016;41(1):27-37
Han Wang, PhD; Shuang Liang, PhD; Maoqing Wang, PhD; Jingquan Gao, PhD; Caihong Sun, PhD; Jia Wang, PhD; Wei Xia, MD; Shiying Wu, PhD; Susan J. Sumner, PhD; Fengyu Zhang, PhD; Changhao Sun, PhD; Lijie Wu, PhD
Background: Early detection and diagnosis are very important for autism. Current diagnosis of autism relies mainly on some observational questionnaires and interview tools that may involve a great variability. We performed a metabolomics analysis of serum to identify potential biomarkers for the early diagnosis and clinical evaluation of autism.
Methods: We analyzed a discovery cohort of patients with autism and participants without autism in the Chinese Han population using ultra-performance liquid chromatography quadrupole time-of-flight tandem mass spectrometry (UPLC/Q-TOF MS/MS) to detect metabolic changes in serum associated with autism. The potential metabolite candidates for biomarkers were individually validated in an additional independent cohort of cases and controls. We built a multiple logistic regression model to evaluate the validated biomarkers.
Results: We included 73 patients and 63 controls in the discovery cohort and 100 cases and 100 controls in the validation cohort. Metabolomic analysis of serum in the discovery stage identified 17 metabolites, 11 of which were validated in an independent cohort. A multiple logistic regression model built on the 11 validated metabolites fit well in both cohorts. The model consistently showed that autism was associated with 2 particular metabolites: sphingosine 1-phosphate and docosahexaenoic acid.
Limitations: While autism is diagnosed predominantly in boys, we were unable to perform the analysis by sex owing to difficulty recruiting enough female patients. Other limitations include the need to perform test–retest assessment within the same individual and the relatively small sample size.
Conclusion: Two metabolites have potential as biomarkers for the clinical diagnosis and evaluation of autism.
Submitted Jan. 9, 2014; Revised May 16, 2014; Revised Aug. 13, 2014; Revised Oct. 30, 2014; Revised Dec. 15, 2014; Accepted Mar. 20, 2015; Early-released Sept. 22, 2015
Acknowledgments: This work was supported by the Natural Science Foundation of China (No: 81273094).
Affiliations: From the Department of Child and Adolescent Health, School of Public Health, Harbin Medical University, Harbin, Heilongjiang, China (Wang, Liang, Gao, Sun, Wang, Xia, Wu); the Center for Endemic Disease Control, China Center for Disease Control and Prevention and Harbin Medical University, Harbin, Heilongjiang, China (Wang); the Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, Harbin, Heilongjiang, China (Wang, Sun); the Department of Nursing, Daqing Campus, Harbin Medical University, Daqing, Heilongjiang, China (Gao); the Advanced Analytic Division, SAS Institute, Inc, Cary, North Carolina, USA (Wu); Systems and Translational Sciences, Research Triangle Institute, Research Triangle Park, North Carolina, USA (Sumner); and Lieber Institute for Brain Development, Johns Hopkins University Medical Campus, Baltimore, Maryland, USA (Zhang).
Competing interests: None declared.
Contributors: F. Zhang, Changhao Sun and L. Wu designed the study. H. Wang, S. Liang, M. Wang, J. Gao, Caihong Sun, J. Wang, W. Xia and L. Wu acquired the data, which H. Wang, M. Wang, S. Wu, S. Sumner, F. Zhang, Changhao Sun and L. Wu analyzed. All authors wrote and reviewed the article and approved it for publication.
Correspondence to: L. Wu, Department of Child and Adolescent Health, or C. Sun, Department of Nutrition and Food Hygiene, School of Public Health, Harbin Medical University, 157 Baojian Road, Nangang District, Harbin 150081, China; email@example.com; Sun2002changhao@yahoo.com