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TigarB causes mitochondrial dysfunction and neuronal loss in PINK1 deficiency
Author(s) -
Flinn Laura J.,
Keatinge Marcus,
Bretaud Sandrine,
Mortiboys Heather,
Matsui Hideaki,
Felice Elena,
Woodroof Helen I.,
Brown Lucy,
McTighe Aimee,
Soellner Rosemarie,
Allen Claire E.,
Heath Paul R.,
Milo Marta,
Muqit Miratul M. K.,
Reichert Andreas S.,
Köster Reinhard W.,
Ingham Philip W.,
Bandmann Oliver
Publication year - 2013
Publication title -
annals of neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.764
H-Index - 296
eISSN - 1531-8249
pISSN - 0364-5134
DOI - 10.1002/ana.23999
Subject(s) - pink1 , zebrafish , dopaminergic , biology , danio , neurodegeneration , loss function , lrrk2 , parkinson's disease , microbiology and biotechnology , mitochondrion , neuroscience , morpholino , phenotype , genetics , dopamine , mutation , mitophagy , medicine , disease , gene , apoptosis , autophagy
Objective Loss of function mutations in PINK1 typically lead to early onset Parkinson disease (PD). Zebrafish ( Danio rerio ) are emerging as a powerful new vertebrate model to study neurodegenerative diseases. We used a pink1 mutant ( pink −/− ) zebrafish line with a premature stop mutation (Y431*) in the PINK1 kinase domain to identify molecular mechanisms leading to mitochondrial dysfunction and loss of dopaminergic neurons in PINK1 deficiency. Methods The effect of PINK1 deficiency on the number of dopaminergic neurons, mitochondrial function, and morphology was assessed in both zebrafish embryos and adults. Genome‐wide gene expression studies were undertaken to identify novel pathogenic mechanisms. Functional experiments were carried out to further investigate the effect of PINK1 deficiency on early neurodevelopmental mechanisms and microglial activation. Results PINK1 deficiency results in loss of dopaminergic neurons as well as early impairment of mitochondrial function and morphology in Danio rerio . Expression of TigarB , the zebrafish orthologue of the human, TP53‐induced glycolysis and apoptosis regulator TIGAR , was markedly increased in pink −/− larvae. Antisense‐mediated inactivation of TigarB gave rise to complete normalization of mitochondrial function, with resulting rescue of dopaminergic neurons in pink −/− larvae. There was also marked microglial activation in pink −/− larvae, but depletion of microglia failed to rescue the dopaminergic neuron loss, arguing against microglial activation being a key factor in the pathogenesis. Interpretation Pink1 −/− zebrafish are the first vertebrate model of PINK1 deficiency with loss of dopaminergic neurons. Our study also identifies TIGAR as a promising novel target for disease‐modifying therapy in PINK1‐related PD. Ann Neurol 2013;74:837–847