• Kolsoum InanlooRahatloo, Fatemeh Peymani, Kimia Kahrizi, and Hossein Najmabadi.
• School of Biology, College of Science, University of Tehran, Tehran, Iran; Genetic Research Center, University of social welfare and Rehabilitation Sciences, Tehran, Iran. Electronic address: inanloo@ut.ac.ir.
• Neuroscience. 2019 Apr 15; 404: 423-444.

AbstractA significant level of genetic heterogeneity has been demonstrated in intellectual disability (ID). More than 700 genes have been identified in ID patients. To identify molecular pathways underlying this heterogeneity, we applied whole-transcriptome analysis using RNA-Seq in consanguineous families with ID. Significant changes in expression of genes related to neuronal and actin cytoskeletal functions were observed in all the ID families. Remarkably, we found a significant down-regulation of SHTN1 gene and up-regulation of FGFR2 gene in all ID patients. FGFR2, but not SHTN1, was previously reported as an ID causing gene. Detailed gene ontology analyses identified pathways linked to tyrosine protein kinase, actin cytoskeleton, and axonogenesis to be affected in ID patients. The findings reported here provide new insights into the candidate genes and molecular pathways underling ID and highlight the key role of actin cytoskeleton in etiology of ID.Copyright © 2019 IBRO. Published by Elsevier Ltd. All rights reserved.

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