Mutations in CHCHD2 cause α-synuclein aggregation
| Autor: | Iwao Hasegawa, Masato Hasegawa, Yuanzhe Li, Masashi Takanashi, Hiroyo Yoshino, Manabu Funayama, Kei-Ichi Ishikawa, Montasir Elahi, Kazuko Hasegawa, Wado Akamatsu, Aya Ikeda, Yuzuru Imai, Nobutaka Hattori, Akihiro Yamaguchi, Nana Izawa, Kahori Shiba-Fukushima, Kenya Nishioka, Risa Nonaka, Hideyuki Okano, Hidemoto Saiki, Akio Mori, Masayo Morita, Tsuyoshi Inoshita, Hongrui Meng, Ayami Okuzumi |
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| Rok vydání: | 2019 |
| Předmět: |
Male
0301 basic medicine Mitochondrion Biology medicine.disease_cause Protein Aggregates 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Loss of Function Mutation Gene duplication Genetics medicine Animals Humans Respiratory function Induced pluripotent stem cell Molecular Biology Cells Cultured Genetics (clinical) Aged Neurons Alpha-synuclein Mutation Neocortex Protein Stability Dopaminergic Brain Parkinson Disease General Medicine Middle Aged Mitochondria Pedigree nervous system diseases Cell biology DNA-Binding Proteins Disease Models Animal 030104 developmental biology medicine.anatomical_structure nervous system chemistry alpha-Synuclein Drosophila Female Autopsy 030217 neurology & neurosurgery Transcription Factors |
| Zdroj: | Human Molecular Genetics. 28:3895-3911 |
| ISSN: | 1460-2083 0964-6906 |
| DOI: | 10.1093/hmg/ddz241 |
| Popis: | Mutations in CHCHD2 are linked to a familial, autosomal dominant form of Parkinson’s disease (PD). The gene product may regulate mitochondrial respiratory function. However, whether mitochondrial dysfunction induced by CHCHD2 mutations further yields α-synuclein pathology is unclear. Here, we provide compelling genetic evidence that mitochondrial dysfunction induced by PD-linked CHCHD2 T61I mutation promotes α-synuclein aggregation using brain autopsy, induced pluripotent stem cells (iPSCs) and Drosophila genetics. An autopsy of an individual with CHCHD2 T61I revealed widespread Lewy pathology with both amyloid plaques and neurofibrillary tangles that appeared in the brain stem, limbic regions and neocortex. A prominent accumulation of sarkosyl-insoluble α-synuclein aggregates, the extent of which was comparable to that of a case with α-synuclein (SNCA) duplication, was observed in CHCHD2 T61I brain tissue. The prion-like activity and morphology of α-synuclein fibrils from the CHCHD2 T61I brain tissue were similar to those of fibrils from SNCA duplication and sporadic PD brain tissues. α-Synuclein insolubilization was reproduced in dopaminergic neuron cultures from CHCHD2 T61I iPSCs and Drosophila lacking the CHCHD2 ortholog or expressing the human CHCHD2 T61I. Moreover, the combination of ectopic α-synuclein expression and CHCHD2 null or T61I enhanced the toxicity in Drosophila dopaminergic neurons, altering the proteolysis pathways. Furthermore, CHCHD2 T61I lost its mitochondrial localization by α-synuclein in Drosophila. The mislocalization of CHCHD2 T61I was also observed in the patient brain. Our study suggests that CHCHD2 is a significant mitochondrial factor that determines α-synuclein stability in the etiology of PD. |
| Databáze: | OpenAIRE |
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