In the brain, most information processing physically occurs on neuronal dendrites. Understanding how dendrites and dendritic structure develop and function is critical to understanding normal cognition and what may be perturbed in human cognitive disorders and retardation syndromes. Evidence for altered dendritic morphology exists in Alzheimers, Fragile X, and Downs syndrome. In some vertebrates there is evidence that dendritic filopodia help determine the shape of dendritic arbors. In mammals, some dendritic filopodia have been shown to be precursors to dendritic spines. In Drosophila, we are able to visualize dendrites and dendritic filopodia in optically transparent intact animals. We believe the study of dendrites and dendritic filopodia development using a simple but powerful genetic model, should yield insights into more complex mammalian dendrite development. Our approach combines a genetically amenable organism, Drosophila, with high-resolution microscopy to analyze and identify either new genes or genes not previously known to regulate neuronal dendrites. From this proposal we hope to identify signaling molecules and pathways that regulate neuronal dendrite development. As 72% of all human neurological disease genes can be found in Drosophila, orthologues of such genes identified herein may be candidates to play a role in mammalian dendrite development and potentially human neurodevelomental disorders as well.

Agency
National Institute of Health (NIH)
Institute
National Institute of Mental Health (NIMH)
Type
Research Project (R01)
Project #
5R01MH073155-05
Application #
7860527
Study Section
Synapses, Cytoskeleton and Trafficking Study Section (SYN)
Program Officer
Asanuma, Chiiko
Project Start
2006-07-01
Project End
2012-06-30
Budget Start
2010-07-01
Budget End
2012-06-30
Support Year
5
Fiscal Year
2010
Total Cost
$269,408
Indirect Cost
Name
University of North Carolina Chapel Hill
Department
Type
Schools of Medicine
DUNS #
608195277
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599
Williams, Tyisha; Courchet, Julien; Viollet, Benoit et al. (2011) AMP-activated protein kinase (AMPK) activity is not required for neuronal development but regulates axogenesis during metabolic stress. Proc Natl Acad Sci U S A 108:5849-54
Johnson, Erik C; Kazgan, Nevzat; Bretz, Colin A et al. (2010) Altered metabolism and persistent starvation behaviors caused by reduced AMPK function in Drosophila. PLoS One 5:
Kazgan, Nevzat; Williams, Tyisha; Forsberg, Lawrence J et al. (2010) Identification of a nuclear export signal in the catalytic subunit of AMP-activated protein kinase. Mol Biol Cell 21:3433-42
Brenman, Jay E (2009) Fragile X mental retardation protein in the driver's seat. Cereb Cortex 19:1490-2
Williams, Tyisha; Forsberg, Lawrence J; Viollet, Benoit et al. (2009) Basal autophagy induction without AMP-activated protein kinase under low glucose conditions. Autophagy 5:1155-65
Williams, Tyisha; Brenman, Jay E (2008) LKB1 and AMPK in cell polarity and division. Trends Cell Biol 18:193-8
Mirouse, Vincent; Swick, Lance L; Kazgan, Nevzat et al. (2007) LKB1 and AMPK maintain epithelial cell polarity under energetic stress. J Cell Biol 177:387-92