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    1 Comment for this article
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    Two previous meta-analyses also demonstrate higher BDNF in autism compared to controls
    Dr. Bernard Crespi, FRSC | Department of Biological Sciences, Simon Fraser University, Canada
    Readers may wish to note that two recently-published papers, which were
    not cited in this article, have previously demonstrated higher BDNF in autism than in controls by meta-analyses.

    Peripheral brain-derived neurotrophic factor in autism spectrum
    disorder: a systematic review and meta-analysis.
    Zheng Z, Zhang L, Zhu T, Huang J, Qu Y, Mu D.
    Sci Rep. 2016 published Aug 10 6:31241.

    Meta-Analysis of BDNF Levels in Autism.
    Armeanu R, Mokkonen M, Crespi B.
    Cell Mol Neurobiol. 2016 published Aug 8.

    Future studies on this topic might usefully test for associations of BDNF levels
    with specific autism-related phenotypes, to help in understanding functional links
    of this
    neurotrophic factor with autism. It is also of interest that BDNF levels have been shown to be reduced in schizophrenia, bipolar disorder, and depression
    by meta-analyses (references in Armeanu et al. 2016), which suggests usefulness
    of this factor in differentiating autism spectrum from psychotic-affective spectrum disorders.
    CONFLICT OF INTEREST: None Reported
    READ MORE
    Original Investigation
    November 2016

    Association of Peripheral Blood Levels of Brain-Derived Neurotrophic Factor With Autism Spectrum Disorder in Children: A Systematic Review and Meta-analysis

    Author Affiliations
    • 1Center on Translational Neuroscience, College of Life and Environmental Sciences, Minzu University of China, Beijing
    • 2Beijing Engineering Research Center of Food Environment and Health, Minzu University of China, Beijing
    • 3Section on Cellular Neurobiology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
    JAMA Pediatr. 2016;170(11):1079-1086. doi:10.1001/jamapediatrics.2016.1626
    Key Points

    Question  Are peripheral blood levels of brain-derived neurotrophic factor (BDNF) altered in children with autism spectrum disorder (ASD)?

    Findings  In this meta-analysis of 19 studies with 2896 unique participants, children with ASD demonstrated significantly increased blood levels of BDNF compared with healthy control children.

    Meaning  This study provides a novel perspective into the etiology of ASD, and future investigations into BDNF levels for early diagnosis of the disease may be warranted.

    Abstract

    Importance  Accumulating evidence suggests that brain-derived neurotrophic factor (BDNF) may be implicated in the developmental outcomes of children with autism spectrum disorder (ASD).

    Objective  To use meta-analysis to determine whether children with ASD have altered peripheral blood levels of BDNF.

    Data Source  A systematic search of PubMed, PsycINFO, and Web of Science was performed for English-language literature through February 7, 2016. The search terms included brain-derived neurotrophic factor or BDNF in combination with autism, without year restriction. Two additional records were retrieved after a review of the reference lists of selected articles.

    Study Selection  Studies were included if they provided data on peripheral blood levels of BDNF in children with ASD and healthy control children. Studies that included adults or with overlapping samples were excluded.

    Data Extraction and Synthesis  Data were extracted by 2 independent observers from 19 included studies. Data were pooled using a random-effects model with Comprehensive Meta-analysis software.

    Main Outcomes and Measures  Blood levels of BDNF in children with ASD compared with healthy controls. Altered levels of BDNF were hypothesized to be related to ASD.

    Results  This meta-analysis included 19 studies with 2896 unique participants. Random-effects meta-analysis of all 19 studies showed that children with ASD had significantly increased peripheral blood levels of BDNF compared with healthy controls (Hedges g, 0.490; 95% CI, 0.185-0.794; P = .002). Subgroup analyses in 4 studies revealed that neonates diagnosed with ASD later in life had no association with blood levels of BDNF (Hedges g, 0.384; 95% CI, −0.244 to 1.011; P = .23), whereas children in the nonneonate ASD group (15 studies) demonstrated significantly increased BDNF levels compared with healthy controls (Hedges g, 0.524; 95% CI, 0.206 to 0.842; P = .001). Further analysis showed that children in the nonneonate ASD group had increased BDNF levels in serum (10 studies) (Hedges g, 0.564; 95% CI, 0.168 to 0.960; P = .005) but not in plasma (5 studies) (Hedges g, 0.436; 95% CI, −0.176 to 1.048; P = .16). Meta-regression analyses revealed that sample size had a moderating effect on the outcome of the meta-analysis in the nonneonate group. In addition, no publication bias was found in the meta-analysis.

    Conclusions and Relevance  Children with ASD have increased peripheral blood levels of BDNF, strengthening the clinical evidence of an abnormal neurotrophic factor profile in this population.

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