Rhomboid-7 and HtrA2/Omi act in a common pathway with the Parkinson’s disease factors Pink1 and Parkin
Identifieur interne : 002147 ( Main/Exploration ); précédent : 002146; suivant : 002148Rhomboid-7 and HtrA2/Omi act in a common pathway with the Parkinson’s disease factors Pink1 and Parkin
Auteurs : Alexander J. Whitworth [Royaume-Uni] ; Jeffrey R. Lee [Canada] ; Venus M.-W. Ho [Royaume-Uni] ; Robert Flick [Canada] ; Ruhena Chowdhury [Royaume-Uni] ; G. Angus Mcquibban [Canada]Source :
- Disease Models & Mechanisms [ 1754-8403 ] ; 2008.
Abstract
Parkinson’s disease (PD) is a common neurodegenerative disorder caused by loss of midbrain dopaminergic neurons, the pathogenetic mechanisms of which remain unclear. Mitochondrial dysfunction, which has long been implicated in sporadic PD, has recently been highlighted as a key pathological cause, particularly with the identification of mutations in the
Url:
DOI: 10.1242/dmm.000109
PubMed: 19048081
PubMed Central: 2562193
Affiliations:
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<front><div type="abstract" xml:lang="en"><title>SUMMARY</title>
<p>Parkinson’s disease (PD) is a common neurodegenerative disorder caused by loss of midbrain dopaminergic neurons, the pathogenetic mechanisms of which remain unclear. Mitochondrial dysfunction, which has long been implicated in sporadic PD, has recently been highlighted as a key pathological cause, particularly with the identification of mutations in the <italic>PTEN-induced putative kinase (pink1)</italic>
, <italic>parkin</italic>
and <italic>htrA2 (also known as omi)</italic>
genes that are linked to PD. Studies in <italic>Drosophila melanogaster</italic>
have shown that <italic>pink1</italic>
and <italic>parkin</italic>
act in a common genetic pathway that maintains mitochondrial integrity, but other upstream or downstream components of this pathway are currently unknown. Using ectopic expression in the Drosophila eye as an assay, we have investigated the involvement of the mitochondrial protease encoded by <italic>omi</italic>
in the Pink1/Parkin pathway and found that it acts genetically downstream of <italic>pink1</italic>
but functions independently of Parkin. Using the same approach, we also found that Rhomboid-7, a mitochondrial protease not previously implicated in PD, acts as an upstream component of this pathway, and showed that it is required to cleave the precursor forms of both Pink1 and Omi. These data further elucidate the composition of the Pink1 pathway and suggest that regulated intramembrane proteolysis is involved in its regulation.</p>
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