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Soudyab M, Shariati M, Esfehani RJ, Shalaei N, Vafadar S, Nouri V, Zech M, Winkelmann J, Shoeibi A, Sadr-Nabavi A. Whole-Exome Sequencing Study of Consanguineous Parkinson's Disease Families and Related Phenotypes: Report of Twelve Novel Variants. J Mol Neurosci 2022; 72:2486-2496. [PMID: 36520381 DOI: 10.1007/s12031-022-02085-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 11/15/2022] [Indexed: 12/23/2022]
Abstract
Parkinson's disease (PD) is a common progressive neurodegenerative disorder with motor and nonmotor symptoms. Recent studies demonstrate various susceptibility loci and candidate genes for familial forms of the disease. However, the genetic basis of the familial form of early-onset PD (EOPD) is not widely studied in the Iranian population. Therefore, the present study aimed to investigate the possible causative genetic variants responsible for developing EOPD among Iranian patients. Iranian patients with a clinical diagnosis of Parkinson's disease were evaluated, and 12 consanguineous families with at least two affected individuals with early-onset PD (EOPD) were chosen to enroll in the present study. An expert neurologist group examined these families. Whole-exome sequencing (WES) was performed on PD patients, and the possible causative genetic variants related to the development of PD were reported. Exome sequencing (WES) was performed on every PD patient and revealed that patients had novel genetic variants in PRKN, PARK7, and PINK1 genes. All the genetic variants were in homozygous status and none of these variants were previously reported in the literature. Moreover, these genetic variants were "pathogenic" based on bioinformatic studies and according to the American College of Medical Genetics (ACMG). The present research revealed some novel variants for EOPD among the Iranian population. Further functional studies are warranted to confirm the pathogenicity of these novel variants and establish their clinical application for the early diagnosis of EOPD.
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Affiliation(s)
- Mohammad Soudyab
- Department of Medical Genetics and Molecular Medicine, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.,Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Shariati
- Department of Neurology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.,Academic Center for Education, Culture, and Research (ACECR)-Khorasan Razavi, Mashhad, Iran
| | | | - Neda Shalaei
- Department of Neurology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Shabnam Vafadar
- Department of Neurology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Vahid Nouri
- Academic Center for Education, Culture, and Research (ACECR)-Khorasan Razavi, Mashhad, Iran
| | - Michael Zech
- Institute of Neurogenomics, Helmholtz Zentrum München, Munich, Germany.,Institut Für Humangenetik, Technische Universität München, Munich, Germany
| | - Julianne Winkelmann
- Institute of Neurogenomics, Helmholtz Zentrum München, Munich, Germany.,Institut Für Humangenetik, Technische Universität München, Munich, Germany.,Lehrstuhl Für Neurogenetik, Technische Universität München, Munich, Germany.,Munich Cluster for Systems Neurology, SyNergy, Munich, Germany
| | - Ali Shoeibi
- Department of Neurology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Ariane Sadr-Nabavi
- Department of Medical Genetics and Molecular Medicine, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. .,Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. .,Department of Neurology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. .,Academic Center for Education, Culture, and Research (ACECR)-Khorasan Razavi, Mashhad, Iran. .,Institute of Neurogenomics, Helmholtz Zentrum München, Munich, Germany. .,Institut Für Humangenetik, Technische Universität München, Munich, Germany.
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Imberechts D, Kinnart I, Wauters F, Terbeek J, Manders L, Wierda K, Eggermont K, Madeiro RF, Sue C, Verfaillie C, Vandenberghe W. DJ-1 is an essential downstream mediator in PINK1/parkin-dependent mitophagy. Brain 2022; 145:4368-4384. [PMID: 36039535 PMCID: PMC9762950 DOI: 10.1093/brain/awac313] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 07/19/2022] [Accepted: 08/14/2022] [Indexed: 01/19/2023] Open
Abstract
Loss-of-function mutations in the PRKN, PINK1 and PARK7 genes (encoding parkin, PINK1 and DJ-1, respectively) cause autosomal recessive forms of Parkinson's disease. PINK1 and parkin jointly mediate selective autophagy of damaged mitochondria (mitophagy), but the mechanisms by which loss of DJ-1 induces Parkinson's disease are not well understood. Here, we investigated PINK1/parkin-mediated mitophagy in cultured human fibroblasts and induced pluripotent stem cell-derived neurons with homozygous PARK7 mutations. We found that DJ-1 is essential for PINK1/parkin-mediated mitophagy. Loss of DJ-1 did not interfere with PINK1 or parkin activation after mitochondrial depolarization but blocked mitophagy further downstream by inhibiting recruitment of the selective autophagy receptor optineurin to depolarized mitochondria. By contrast, starvation-induced, non-selective autophagy was not affected by loss of DJ-1. In wild-type fibroblasts and induced pluripotent stem cell-derived dopaminergic neurons, endogenous DJ-1 translocated to depolarized mitochondria in close proximity to optineurin. DJ-1 translocation to depolarized mitochondria was dependent on PINK1 and parkin and did not require oxidation of cysteine residue 106 of DJ-1. Overexpression of DJ-1 did not rescue the mitophagy defect of PINK1- or parkin-deficient cells. These findings position DJ-1 downstream of PINK1 and parkin in the same pathway and suggest that disruption of PINK1/parkin/DJ-1-mediated mitophagy is a common pathogenic mechanism in autosomal recessive Parkinson's disease.
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Affiliation(s)
| | - Inge Kinnart
- Laboratory for Parkinson Research, KU Leuven, 3000
Leuven, Belgium
| | - Fieke Wauters
- Laboratory for Parkinson Research, KU Leuven, 3000
Leuven, Belgium
| | - Joanne Terbeek
- Laboratory for Parkinson Research, KU Leuven, 3000
Leuven, Belgium
| | - Liselot Manders
- Laboratory for Parkinson Research, KU Leuven, 3000
Leuven, Belgium
| | - Keimpe Wierda
- Electrophysiology Expertise Unit, VIB-KU Leuven Center for Brain and
Disease Research, 3000 Leuven, Belgium
| | - Kristel Eggermont
- Stem Cell and Developmental Biology, KU Leuven,
3000 Leuven, Belgium
| | | | - Carolyn Sue
- Department of Neurogenetics, Kolling Institute of Medical Research, Royal
North Shore Hospital and University of Sydney, St. Leonards
2065, Australia
| | | | - Wim Vandenberghe
- Correspondence to: Wim Vandenberghe Department of Neurology,
University Hospitals Leuven Herestraat 49, 3000 Leuven, Belgium E-mail:
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