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Kosmidis, S., Grammenoudi, S., Papanikolopoulou, K., Skoulakis, E.M. (2010). Differential effects of Tau on the integrity and function of neurons essential for learning in Drosophila.  J. Neurosci. 30(2): 464--477.
FlyBase ID
FBrf0215006
Publication Type
Research paper
Abstract

Tauopathies are a heterogeneous group of neurodegenerative dementias involving perturbations in the levels, phosphorylation, or mutations of the microtubule-binding protein Tau. The heterogeneous pathology in humans and model organisms suggests differential susceptibility of neuronal types to wild-type (WT) and mutant Tau. WT and mutant human Tau-encoding transgenes expressed pan-neuronally in the Drosophila CNS yielded specific and differential toxicity in the embryonic neuroblasts that generate the mushroom body (MB) neurons, suggesting cell type-specific effects of Tau in the CNS. Frontotemporal dementia with parkinsonism-17-linked mutant isoforms were significantly less toxic in MB development. Tau hyperphosphorylation was essential for these MB aberrations, and we identified two novel putative phosphorylation sites, Ser(238) and Thr(245), on WT hTau essential for its toxic effects on MB integrity. Significantly, blocking putative Ser(238) and Thr(245) phosphorylation yielded animals with apparently structurally normal but profoundly dysfunctional MBs, because animals accumulating this mutant protein exhibited strongly impaired associative learning. Interestingly, the mutant protein was hyperphosphorylated at epitopes typically associated with toxicity and neurodegeneration, such as AT8, AT100, and the Par-1 targets Ser(262) and Ser(356), suggesting that these sites in the context of adult intact MBs mediate dysfunction and occupation of these sites may precede the toxicity-associated Ser(238) and Thr(245) phosphorylation. The data support the notion that phosphorylation at particular sites rather than hyperphosphorylation per se mediates toxicity or dysfunction in a cell type-specific manner.

PubMed ID
PubMed Central ID
PMC6632986 (PMC) (EuropePMC)
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    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    J. Neurosci.
    Title
    Journal of Neuroscience
    Publication Year
    1981-
    ISBN/ISSN
    0270-6474 1529-2401
    Data From Reference