Early-onset Parkinson disease caused by a mutation in CHCHD2 and mitochondrial dysfunction

Richard G. Lee, Maryam Sedghi, Mehri Salari, Anne-Marie J. Shearwood, Maike Stentenbach, Ariana Kariminejad, Hayley Goullee, Oliver Rackham, Nigel G. Laing, Homa Tajsharghi, Aleksandra Filipovska

Research output: Contribution to journalArticle

Abstract

Objective

Our goal was to identify the gene(s) associated with an early-onset form of Parkinson disease (PD) and the molecular defects associated with this mutation.

Methods

We combined whole-exome sequencing and functional genomics to identify the genes associated with early-onset PD. We used fluorescence microscopy, cell, and mitochondrial biology measurements to identify the molecular defects resulting from the identified mutation.

Results

Here, we report an association of a homozygous variant in CHCHD2, encoding coiled-coil-helix-coiled-coil-helix domain containing protein 2, a mitochondrial protein of unknown function, with an early-onset form of PD in a 26-year-old Caucasian woman. The CHCHD2 mutation in PD patient fibroblasts causes fragmentation of the mitochondrial reticular morphology and results in reduced oxidative phosphorylation at complex I and complex IV. Although patient cells could maintain a proton motive force, reactive oxygen species production was increased, which correlated with an increased metabolic rate.

Conclusions

Our findings implicate CHCHD2 in the pathogenesis of recessive early-onset PD, expanding the repertoire of mitochondrial proteins that play a direct role in this disease.

Original languageEnglish
Article number276
Number of pages10
JournalNeurology: Genetics
Volume4
Issue number5
DOIs
Publication statusPublished - Oct 2018

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