Ludwig-Maximilians-Universität, Chair of Metabolic Biochemistry

Breadcrumb Navigation


Loss of the Parkinson's disease-linked gene DJ-1 perturbs mitochondrial dynamics

Hum Mol Genet. 2010 Oct 1;19(19):3734-46. Epub 2010 Jul 16.

Authors/Editors: Irrcher I
Aleyasin H
Seifert EL
Hewitt SJ
Chhabra S
Phillips M
Lutz AK
Rousseaux MW
Bevilacqua L
Jahani-Asl A
Callaghan S
MacLaurin JG
Winklhofer KF
Rizzu P
Rippstein P
Kim RH
Chen CX
Fon EA
Slack RS
Harper ME
McBride HM
Mak TW
Park DS
Publication Date: 2010
Type of Publication: Journal Article


Growing evidence highlights a role for mitochondrial dysfunction and oxidative stress as underlying contributors to Parkinson's disease (PD) pathogenesis. DJ-1 (PARK7) is a recently identified recessive familial PD gene. Its loss leads to increased susceptibility of neurons to oxidative stress and death. However, its mechanism of action is not fully understood. Presently, we report that DJ-1 deficiency in cell lines, cultured neurons, mouse brain and lymphoblast cells derived from DJ-1 patients display aberrant mitochondrial morphology. We also show that these DJ-1-dependent mitochondrial defects contribute to oxidative stress-induced sensitivity to cell death since reversal of this fragmented mitochondrial phenotype abrogates neuronal cell death. Reactive oxygen species (ROS) appear to play a critical role in the observed defects, as ROS scavengers rescue the phenotype and mitochondria isolated from DJ-1 deficient animals produce more ROS compared with control. Importantly, the aberrant mitochondrial phenotype can be rescued by the expression of Pink1 and Parkin, two PD-linked genes involved in regulating mitochondrial dynamics and quality control. Finally, we show that DJ-1 deficiency leads to altered autophagy in murine and human cells. Our findings define a mechanism by which the DJ-1-dependent mitochondrial defects contribute to the increased sensitivity to oxidative stress-induced cell death that has been previously reported.


Related Links