The broad objective of the research proposed here is to define the molecular mechanisms that regulate oppositional functions of the bHLH transcription factor Olig2 on proliferation and differentiation of neural progenitor cells. In preliminary studies, we have identified a cluster of three serine residues (""""""""Triple-S motif"""""""") in the amino terminus of Olig2 that are phosphorylated in cycling neural progenitors, but not in differentiated progeny. Mutational analysis indicates that phosphorylation of the Olig2 Triple-S motif is required for self-renewal of neural stem cells but is not required for Olig2-dependent specification of immature oligodendrocytes. The work proposed here builds upon these preliminary observations. We have five Specific Aims:
Aim One is to identify the protein kinase(s) that phosphorylate Olig2 using small molecule kinase inhibitors and a kinome-wide ShRNAi library.
Aim Two is to define Olig2 protein-protein interactions that are regulated by phosphorylation using """"""""TAP- Tagged"""""""" wild type, phospho-null and phosphomimetic Olig2 proteins.
Aim Three is to define the transcriptional functions of Olig2 phosphorylation to dictate the decision of neural progenitors to self renew or exit the cell cycle and differentiate. We will use ChIP/Seq protocols to identify direct genetic targets of phosphorylated Olig2.
Aim Four is to determine a possible requirement for Olig2 Triple-S phosphorylation in embryonic patterning of spinal cord and in motor neuron development using a novel, bifunctional Olig2-tva-cre transgenic mouse neural tube explant system.
Aim Five is to determine a possible requirement for Olig2 phosphorylation during oligodendrocyte maturation and CNS tumorgenesis in vivo. Orthotopic grafting studies will determine if Olig2 phosphorylation is essential for oligodendrocyte myelination, or alternatively, tumorgenesis in a mouse model of malignant glioma.

Public Health Relevance

The proposed work may shed light on molecular mechanisms that regulate neural progenitors in malignant gliomas, spinal cord injury and demyelinating diseases.

Agency
National Institute of Health (NIH)
Institute
National Institute of Neurological Disorders and Stroke (NINDS)
Type
Research Project (R01)
Project #
5R01NS040511-14
Application #
8402402
Study Section
Special Emphasis Panel (ZRG1-MDCN-N (02))
Program Officer
Owens, David F
Project Start
2000-08-01
Project End
2014-12-31
Budget Start
2013-01-01
Budget End
2013-12-31
Support Year
14
Fiscal Year
2013
Total Cost
$416,260
Indirect Cost
$63,130
Name
University of California San Francisco
Department
Pediatrics
Type
Schools of Medicine
DUNS #
094878337
City
San Francisco
State
CA
Country
United States
Zip Code
94143
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