Mitochondrial targeting sequence variants of the CHCHD2 gene are a risk for Lewy body disorders
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Abstract
Objective: To assess the role of CHCHD2 variants in patients with Parkinson disease (PD) and Lewy body disease (LBD) in Caucasian populations.
Methods: All exons of the CHCHD2 gene were sequenced in a US Caucasian patient-control series (878 PD, 610 LBD, and 717 controls). Subsequently, exons 1 and 2 were sequenced in an Irish series (355 PD and 365 controls) and a Polish series (394 PD and 350 controls). Immunohistochemistry and immunofluorescence studies were performed on pathologic LBD cases with rare CHCHD2 variants.
Results: We identified 9 rare exonic variants of unknown significance. These variants were more frequent in the combined group of PD and LBD patients compared to controls (0.6% vs 0.1%, p = 0.013). In addition, the presence of any rare variant was more common in patients with LBD (2.5% vs 1.0%, p = 0.050) compared to controls. Eight of these 9 variants were located within the gene's mitochondrial targeting sequence.
Conclusions: Although the role of variants of the CHCHD2 gene in PD and LBD remains to be further elucidated, the rare variants in the mitochondrial targeting sequence may be a risk factor for Lewy body disorders, which may link CHCHD2 to other genetic forms of parkinsonism with mitochondrial dysfunction.
GLOSSARY
- CHCHD2=
- coiled-coil-helix-coiled-coil-helix domain containing 2;
- COX=
- cytochrome c oxidase;
- LBD=
- Lewy body disease;
- MAF=
- minor allele frequency;
- MTS=
- mitochondrial targeting sequence;
- OxPhos=
- oxidative phosphorylation;
- PD=
- Parkinson disease
Footnotes
Go to Neurology.org for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
↵* These authors contributed equally to this work.
Supplemental data at Neurology.org
Editorial, page 2002
- Received March 16, 2015.
- Accepted in final form July 23, 2015.
- © 2015 American Academy of Neurology
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