Disruption of a RAC1-centred network is associated with Alzheimer’s disease pathology and causes age-dependent neurodegeneration
Abstract
Abstract The molecular biological mechanisms of Alzheimer’s disease (AD) involve disease-associated crosstalk through many genes and include a loss of normal as well as a gain of abnormal interactions among genes. A protein domain network (PDN) is a collection of physical bindings that occur between protein domains, and the states of the PDNs in patients with AD are likely to be perturbed compared to those in normal healthy individuals. To identify PDN changes that cause neurodegeneration, we analysed the PDNs that occur among genes co-expressed in each of three brain regions at each stage of AD. Our analysis revealed that the PDNs collapsed with the progression of AD stage and identified five hub genes, including Rac1, as key players in PDN collapse. Using publicly available as well as our own gene expression data, we confirmed that the mRNA expression level of the RAC1 gene was downregulated in the entorhinal cortex (EC) of AD brains. To test the causality of these changes in neurodegeneration, we utilized Drosophila as a genetic model and found that modest knockdown of Rac1 in neurons was sufficient to cause age-dependent behavioural deficits and neurodegeneration. Finally, we identified a microRNA, hsa-miR-101-3p, as a potential regulator of RAC1more »
- Authors:
-
- Department of Genome Informatics, Graduate School of Medicine, Osaka University, Osaka 565-0871, Japan
- Department of Alzheimer’s Disease Research, Center for Development of Advanced Medicine for Dementia, National Center for Geriatrics and Gerontology, Aichi 474-8511, Japan, Department of Experimental Gerontology, Graduate School of Pharmaceutical Sciences, Nagoya City University, Aichi 467-8603, Japan
- Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
- Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata 951-8585, Japan, Asahigawaso Medical-Welfare Center, Asahigawaso Research Institute, Okayama 703-8207, Japan
- Publication Date:
- Sponsoring Org.:
- USDOE Office of Electricity (OE), Advanced Grid Research & Development. Power Systems Engineering Research
- OSTI Identifier:
- 1607604
- Alternate Identifier(s):
- OSTI ID: 1599912
- Resource Type:
- Published Article
- Journal Name:
- Human Molecular Genetics
- Additional Journal Information:
- Journal Name: Human Molecular Genetics Journal Volume: 29 Journal Issue: 5; Journal ID: ISSN 0964-6906
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Kikuchi, Masataka, Sekiya, Michiko, Hara, Norikazu, Miyashita, Akinori, Kuwano, Ryozo, Ikeuchi, Takeshi, Iijima, Koichi M., and Nakaya, Akihiro. Disruption of a RAC1-centred network is associated with Alzheimer’s disease pathology and causes age-dependent neurodegeneration. United Kingdom: N. p., 2020.
Web. doi:10.1093/hmg/ddz320.
Kikuchi, Masataka, Sekiya, Michiko, Hara, Norikazu, Miyashita, Akinori, Kuwano, Ryozo, Ikeuchi, Takeshi, Iijima, Koichi M., & Nakaya, Akihiro. Disruption of a RAC1-centred network is associated with Alzheimer’s disease pathology and causes age-dependent neurodegeneration. United Kingdom. https://doi.org/10.1093/hmg/ddz320
Kikuchi, Masataka, Sekiya, Michiko, Hara, Norikazu, Miyashita, Akinori, Kuwano, Ryozo, Ikeuchi, Takeshi, Iijima, Koichi M., and Nakaya, Akihiro. Thu .
"Disruption of a RAC1-centred network is associated with Alzheimer’s disease pathology and causes age-dependent neurodegeneration". United Kingdom. https://doi.org/10.1093/hmg/ddz320.
@article{osti_1607604,
title = {Disruption of a RAC1-centred network is associated with Alzheimer’s disease pathology and causes age-dependent neurodegeneration},
author = {Kikuchi, Masataka and Sekiya, Michiko and Hara, Norikazu and Miyashita, Akinori and Kuwano, Ryozo and Ikeuchi, Takeshi and Iijima, Koichi M. and Nakaya, Akihiro},
abstractNote = {Abstract The molecular biological mechanisms of Alzheimer’s disease (AD) involve disease-associated crosstalk through many genes and include a loss of normal as well as a gain of abnormal interactions among genes. A protein domain network (PDN) is a collection of physical bindings that occur between protein domains, and the states of the PDNs in patients with AD are likely to be perturbed compared to those in normal healthy individuals. To identify PDN changes that cause neurodegeneration, we analysed the PDNs that occur among genes co-expressed in each of three brain regions at each stage of AD. Our analysis revealed that the PDNs collapsed with the progression of AD stage and identified five hub genes, including Rac1, as key players in PDN collapse. Using publicly available as well as our own gene expression data, we confirmed that the mRNA expression level of the RAC1 gene was downregulated in the entorhinal cortex (EC) of AD brains. To test the causality of these changes in neurodegeneration, we utilized Drosophila as a genetic model and found that modest knockdown of Rac1 in neurons was sufficient to cause age-dependent behavioural deficits and neurodegeneration. Finally, we identified a microRNA, hsa-miR-101-3p, as a potential regulator of RAC1 in AD brains. As the Braak neurofibrillary tangle (NFT) stage progressed, the expression levels of hsa-miR-101-3p were increased specifically in the EC. Furthermore, overexpression of hsa-miR-101-3p in the human neuronal cell line SH-SY5Y caused RAC1 downregulation. These results highlight the utility of our integrated network approach for identifying causal changes leading to neurodegeneration in AD.},
doi = {10.1093/hmg/ddz320},
journal = {Human Molecular Genetics},
number = 5,
volume = 29,
place = {United Kingdom},
year = {2020},
month = {1}
}
https://doi.org/10.1093/hmg/ddz320
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