Suppression of Neurodegeneration and Increased Neurotransmission Caused by Expanded Full-Length Huntingtin Accumulating in the Cytoplasm
Cytoplasm
Neuroscience(all)
Green Fluorescent Proteins
HUMDISEASE
Nerve Tissue Proteins
Eye
Synaptic Transmission
MOLNEURO
Animals, Genetically Modified
03 medical and health sciences
Animals
Humans
Huntingtin Protein
Neurotransmitter Agents
0303 health sciences
Behavior, Animal
Nuclear Proteins
3. Good health
Disease Models, Animal
Huntington Disease
Larva
Mutation
Nerve Degeneration
Microscopy, Electron, Scanning
Calcium
Drosophila
DOI:
10.1016/j.neuron.2007.11.025
Publication Date:
2008-01-11T16:03:15Z
AUTHORS (7)
ABSTRACT
Huntington's disease (HD) is a dominantly inherited neurodegenerative disorder caused by expansion of a translated CAG repeat in the N terminus of the huntingtin (htt) protein. Here we describe the generation and characterization of a full-length HD Drosophila model to reveal a previously unknown disease mechanism that occurs early in the course of pathogenesis, before expanded htt is imported into the nucleus in detectable amounts. We find that expanded full-length htt (128Qhtt(FL)) leads to behavioral, neurodegenerative, and electrophysiological phenotypes. These phenotypes are caused by a Ca2+-dependent increase in neurotransmitter release efficiency in 128Qhtt(FL) animals. Partial loss of function in synaptic transmission (syntaxin, Snap, Rop) and voltage-gated Ca2+ channel genes suppresses both the electrophysiological and the neurodegenerative phenotypes. Thus, our data indicate that increased neurotransmission is at the root of neuronal degeneration caused by expanded full-length htt during early stages of pathogenesis.
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