Parkinson's disease (PD) is a degenerative disease of the central nervous system (CNS) characterized by the accumulation and aggregation of a-synuclein in which the dopaminergic neurons of the substantia nigra die. The innate immune system is thought to play a role in the demise of these neurons. Therefore, we hypothesized that genotypic differences in microglia are involved in the pathophysiology of PD and, particularly, in the death of these dopamine producing cells. Our preliminary cis-eQTL analyses of data from healthy young individuals have implicated 11 PD susceptibility genes in myeloid cell function, whose expression, relative to each risk allele, is altered in the innate immune cell type monocytes and not in T cells that represent the adaptive arm of the immune system. Therefore, these loci represent excellent candidates as the first step in the cascade of molecular events that link genetic risk factors to the altered innate immune function that contributes to PD pathology. The principal goals of the proposed project are (1) to identify the component genes of networks perturbed by the PD susceptibility loci in myeloid cells (2) to understand their functional consequences on microglia behavior and (3) examine the role of these susceptibility loci on CNS microglia activation and gene expression.

Public Health Relevance

: Influence of genotype on microglia phenotype and function in PD Project Narrative Relevance to public health. This project is of direct relevance to Parkinson's disease, as we are proposing to study the discovery of novel targets associated with genetic variants expressed in the innate immune system that lead to Parkinson's disease. We are examining monocyte-derived microglia-like cells from patients with Parkinson's disease, as well as healthy young subjects to examine the genetic variation with-out the confounder of disease. We will use a systems biology approach to unravel the complexity of genome-wide association studies and identify key nodes in the networks that could serve as therapeutic targets. Our data will potentially provide a therapy to target the innate immune system contribution to Parkinson's disease.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
7R01NS089674-03
Application #
9536368
Study Section
Molecular Neurogenetics Study Section (MNG)
Program Officer
Sieber, Beth-Anne
Project Start
2015-09-01
Project End
2019-06-30
Budget Start
2017-07-01
Budget End
2018-06-30
Support Year
3
Fiscal Year
2017
Total Cost
Indirect Cost
Name
Columbia University (N.Y.)
Department
Neurology
Type
Schools of Medicine
DUNS #
621889815
City
New York
State
NY
Country
United States
Zip Code
10032
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Chan, Gail; White, Charles C; Winn, Phoebe A et al. (2016) Trans-pQTL study identifies immune crosstalk between Parkinson and Alzheimer loci. Neurol Genet 2:e90
Shulman, Joshua M (2015) Drosophila and experimental neurology in the post-genomic era. Exp Neurol 274:4-13