Gene networks associated with non-syndromic intellectual disability

Lee, Soohyun, Rudd, Stephen, Gratten, Jacob, Visscher, Peter M., Prins, Johannes B. and Dawson, Paul A. (2017) Gene networks associated with non-syndromic intellectual disability. Journal of Neurogenetics, 1-9. doi:10.1080/01677063.2017.1404058


Author Lee, Soohyun
Rudd, Stephen
Gratten, Jacob
Visscher, Peter M.
Prins, Johannes B.
Dawson, Paul A.
Title Gene networks associated with non-syndromic intellectual disability
Journal name Journal of Neurogenetics   Check publisher's open access policy
ISSN 1563-5260
0167-7063
Publication date 2017-12-04
Year available 2017
Sub-type Article (original research)
DOI 10.1080/01677063.2017.1404058
Open Access Status Not yet assessed
Start page 1
End page 9
Total pages 9
Place of publication Philadelphia, PA United States
Publisher Taylor and Francis
Language eng
Subject 1311 Genetics
2804 Cellular and Molecular Neuroscience
Abstract Non-syndromic intellectual disability (NS-ID) is a genetically heterogeneous disorder, with more than 200 candidate genes to date. Despite the increasing number of novel mutations detected, a relatively low number of recurrently mutated genes have been identified, highlighting the complex genetic architecture of the disorder. A systematic search of PubMed and Medline identified 245 genes harbouring non-synonymous variants, insertions or deletions, which were identified as candidate NS-ID genes from case reports or from linkage or pedigree analyses. From this list, 33 genes are common to syndromic intellectual disability (S-ID) and 58 genes are common to certain neurological and neuropsychiatric disorders that often include intellectual disability as a clinical feature. We examined the evolutionary constraint and brain expression of these gene sets, and we performed gene network and protein–protein interaction analyses using GeneGO MetaCore and DAPPLE, respectively. The 245 NS-ID candidate genes were over-represented in axon guidance, synaptogenesis, cell adhesion and neurotransmission pathways, all of which are key neurodevelopmental processes for the establishment of mature neuronal circuitry in the brain. These 245 genes exhibit significantly elevated expression in human brain and are evolutionarily constrained, consistent with expectations for a brain disorder such as NS-ID that is associated with reduced fecundity. In addition, we report enrichment of dopaminergic and glutamatergic pathways for those candidate NS-ID genes that are common to S-ID and/or neurological and neuropsychiatric disorders that exhibit intellectual disability. Collectively, this study provides an overview and analysis of gene networks associated with NS-ID and suggests modulation of neurotransmission, particularly dopaminergic and glutamatergic systems as key contributors to synaptic dysfunction in NS-ID.
Keyword dopaminergic
genetics
glutamatergic
Idiopathic intellectual disability
neurodevelopment
neurotransmission
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Queensland Brain Institute Publications
School of Biomedical Sciences Publications
 
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Created: Sat, 16 Dec 2017, 20:10:14 EST