In autism spectrum disorder, which of the following is identified as the first biomarker ?: (A) Decreased brain volume in children less than 4 years, (B) Reduced latency of sleep, (C) Increased level of serotonin in the platelets, (D) Increased levels of dopamine
Answer is C. In autism spectrum disorder, | level of serotonin in the platelets is identified as the first biomarker. Other biomarkers are mTOR pathway Increased total brain volume in children < 4 years of age g-aminobutyric acid (GABA) inhibitory system