Survival requires that animals interact in appropriate and adaptive ways with their environment. My lab is interested in how the nervous system integrates information and generates behavioral outputs. We study behavior at the biochemical, cellular and organismal levels using Drosophila melanogaster as a model organism.
Flies, like humans, have basic behaviors (such as locomotion and reproductive behaviors) that can be altered by the animal’s internal state or by exposure to external cues. We use video and automated monitoring systems to assess locomotion, circadian rhythms, sleep and courtship. The ability to manipulate the activity and biochemistry of particular neurons with exquisite spatial and temporal control makes Drosophila a powerful system for this type of integrative approach.
At the cellular level we use both imaging and electrophysiology to understand how the activity of neurons is changed by experience and how these changes are translated into behaviors. Imaging of calcium responses in the adult brain in the sleep circuitry has allowed us to understand the effects of neuromodulators and sleep deprivation on neuronal activity. Direct recording from central neurons in larvae and adults allows us to investigate how cellular activity is regulated during ongoing behavior or as a result of learning.
At the biochemical level, we are interested in how calcium, a ubiquitous and critical second messenger, transduces information and regulates plasticity. One of the main mechanisms by which calcium acts within the cell is through the activation of calcium-dependent protein kinases such as calcium/calmodulin-dependent protein kinase II (CaMKII). CaMKII homologs have been found in all multicellular organisms that have been examined and have also been found in yeast. In Drosophila, we have shown that CaMKII is required for both behavioral plasticity in courtship learning and for normal synaptic function at the neuromuscular junction.
The long-term goal of this research is to understand the signal transduction pathways underlying changes in synaptic structure and function. By starting with a protein kinase, we have been able to identify both upstream (regulators such as CASK, a MAGUK scaffolding protein) and downstream (substrates such as Eag) elements of the pathway.
Imaging analysis of clock neurons reveals light buffers the wake-promoting effect of dopamine. Shang Y, Haynes P, Pírez N, Harrington KI, Guo F, Pollack J, Hong P, Griffith LC, Rosbash M. Nat Neurosci. 2011 Jun 19;14(7):889-95. [abstract]
Central Regulation of Locomotor Behavior of Drosophila melanogaster Depends on a CASK Isoform Containing CaMK-like and L27 Domains. Slawson JB, Kuklin EA, Ejima A, Mukherjee K, Ostrovsky L, Griffith LC. Genetics. 2011 Jan; 187(1):171-84. [abstract]
Intracellular Regions of the Eag Potassium Channel Play a Critical Role in Generation of Voltage-dependent Currents. Li Y, Liu X, Wu Y, Xu Z, Li H, Griffith LC, Zhou Y. J Biol Chem. 2011 Jan 14;286(2):1389-99.[abstract]
Analysis of Drosophila TRPA1 reveals an ancient origin for human chemical nociception. Kang K, Pulver SR, Panzano VC, Chang EC, Griffith LC, Theobald DL, Garrity PA. Nature. 2010 Mar 25;464(7288):597-600. [abstract]
Spike integration and cellular memory in a rhythmic network from Na+/K+ pump current dynamics. Pulver SR, Griffith LC. Nat Neurosci. 2010 Jan;13(1):53-9. [abstract]
Courtship learning in Drosophila melanogaster: diverse plasticity of a reproductive behavior. Griffith LC, Ejima A. Learn Mem. 2009 Nov 19;16(12):743-50. Print 2009. [abstract]
CaMKII uses GTP as a phosphate donor for both substrate and autophosphorylation. Bostrom SL, Dore J, Griffith LC. Biochem Biophys Res Commun. 2009 Dec 25;390(4):1154-9. [abstract]
Multimodal sensory integration of courtship stimulating cues in Drosophila melanogaster. Griffith LC, Ejima A. Ann N Y Acad Sci. 2009 Jul;1170:394-8. [abstract]
Temporal dynamics of neuronal activation by Channelrhodopsin-2 and TRPA1 determine behavioral output in Drosophila larvae. Pulver SR, Pashkovski SL, Hornstein NJ, Garrity PA, Griffith LC. J Neurophysiol. 2009 Jun;101(6):3075-88. [abstract]
Channelrhodopsin2 mediated stimulation of synaptic potentials at Drosophila neuromuscular junctions. Hornstein NJ, Pulver SR, Griffith LC. J Vis Exp. 2009 Mar 16;(25). [abstract]
High-resolution video tracking of locomotion in adult Drosophila melanogaster. Slawson JB, Kim EZ, Griffith LC. J Vis Exp. 2009 Feb 20;(24). [abstract]
Alternative splicing of the eag potassium channel gene in Drosophila generates a novel signal transduction scaffolding protein. Sun XX, Bostrom SL, Griffith LC. Mol Cell Neurosci. 2008. [abstract]
Light-arousal and circadian photoreception circuits intersect at the large PDF cells of the Drosophila brain.Shang Y, Griffith LC, Rosbash M. Proc Natl Acad Sci U S A. 2008;105(50):19587-94. [full text in PubMed Central] [abstract]
PDF cells are a GABA-responsive wake-promoting component of the Drosophila sleep circuit. Parisky KM, Agosto J, Pulver SR, Shang Y, Kuklin E, Hodge JJ, et al. Neuron. 2008;60(4):672-82. [abstract]
Sleep: hitting the reset button.Griffith LC, Rosbash M. Nat Neurosci. 2008;11(2):123-4. [abstract]
CaMKII: new tricks for an old dog. Griffith LC. Cell. 2008;133(3):397-9. [abstract]
Neuroscience - Love hangover. Griffith LC. Nature. 2008;451(7174):24-5. [abstract]
Courtship initiation is stimulated by acoustic signals in Drosophila melanogaster. Ejima A, Griffith LC. PLoS ONE. 2008;3(9):e3246. [abstract]
Modulation of GABA(A) receptor desensitization uncouples sleep onset and maintenance in Drosophila. Agosto J, Choi JC, Parisky KM, Stilwell G, Rosbash M, Griffith LC. Nat Neurosci. 2008;11(3):354-9. [abstract]
A structural mechanism for maintaining the 'on-state' of the CaMKII memory switch in the post-synaptic density. Mullasseril P, Dosemeci A, Lisman JE, Griffith LC. J Neurochem. 2007;103(1):357-64.[abstract]
The Drosophila ARC homolog regulates behavioral responses to starvation. Mattaliano MD, Montana ES, Parisky KM, Littleton JT, Griffith LC. Mol Cell Neurosci. 2007;36(2):211-21. [abstract]
Generalization of Courtship Learning in Drosophila Is Mediated by cis-Vaccenyl Acetate. Ejima A, Smith BP, Lucas C, van der Goes van Naters W, Miller CJ, Carlson JR, et al. Curr Biol. 2007;17(7):599-605. [abstract]
Cholinergic neurons mediate
CaMKII-dependent enhancement of courtship suppression. Mehren JE, Griffith LC. (2006) Learn
Mem. 2006 Nov-Dec;13(6):686-9. Epub 2006 Nov 13. [abstract]
gating of CaMKII autonomous activity by Drosophila CASK. Hodge JJ, Mullasseril P, Griffith LC. Neuron. 2006 Aug 3;51(3):327-37. [abstract]
Electrophysiological and anatomical
characterization of PDF-positive clock neurons in the intact
adult Drosophila brain. Park D, Griffith LC. (2006) J Neurophysiol. 2006
Jun;95(6):3955-60. Epub 2006 Mar 22. [abstract]
Role for calcium/calmodulin-dependent protein
kinase II in the p75-mediated regulation of sympathetic
cholinergic transmission. Slonimsky JD, Mattaliano MD, Moon JI, Griffith LC, Birren
SJ. (2006) Proc Natl Acad Sci U S A.
2006 Feb 21;103(8):2915-9. Epub 2006 Feb 13. [abstract]
Sequential learning of pheromonal cues modulates memory
consolidation in trainer-specific associative courtship
conditioning. Ejima, A., Smith,
B.P.C., Lucas, C., Levine, J.D. and Griffith, L.C. (2005) Curr Biol. 15:194-206. [abstract]
View Complete Publication List on PubMed: Leslie Griffith
Last edit: July 12, 2012