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NeuroMolecular Medicine

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23.08.2018 | Original Paper

Overexpression of Human Mutant PANK2 Proteins Affects Development and Motor Behavior of Zebrafish Embryos

verfasst von: D. Khatri, D. Zizioli, A. Trivedi, G. Borsani, E. Monti, D. Finazzi

Erschienen in: NeuroMolecular Medicine | Ausgabe 2/2019

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Abstract

Pantothenate Kinase-Associated Neurodegeneration (PKAN) is a genetic and early-onset neurodegenerative disorder characterized by iron accumulation in the basal ganglia. It is due to mutations in Pantothenate Kinase 2 (PANK2), an enzyme that catalyzes the phosphorylation of vitamin B5, first and essential step in coenzyme A (CoA) biosynthesis. Most likely, an unbalance of the neuronal levels of this important cofactor represents the initial trigger of the neurodegenerative process, yet a complete understanding of the connection between PANK2 malfunctioning and neuronal death is lacking. Most PKAN patients carry mutations in both alleles and a loss of function mechanism is proposed to explain the pathology. When PANK2 mutants were analyzed for stability, dimerization capacity, and enzymatic activity in vitro, many of them showed properties like the wild-type form. To further explore this aspect, we overexpressed the wild-type protein, two mutant forms with reduced kinase activity and two retaining the catalytic activity in zebrafish embryos and analyzed the morpho-functional consequences. While the wild-type protein had no effects, all mutant proteins generated phenotypes that partially resembled those observed in pank2 and coasy morphants and were rescued by CoA and vitamin B5 supplementation. The overexpression of PANK2 mutant forms appears to be associated with perturbation in CoA availability, irrespective of their catalytic activity.

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Titel: Overexpression of Human Mutant PANK2 Proteins Affects Development and Motor Behavior of Zebrafish Embryos
verfasst von: D. Khatri
D. Zizioli
A. Trivedi
G. Borsani
E. Monti
D. Finazzi
Publikationsdatum: 23.08.2018
Verlag: Springer US
Erschienen in: NeuroMolecular Medicine / Ausgabe 2/2019
Print ISSN: 1535-1084
Elektronische ISSN: 1559-1174
DOI: https://doi.org/10.1007/s12017-018-8508-8

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