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Poleggi A, van der Lee S, Capellari S, Puopolo M, Ladogana A, De Pascali E, Lia D, Formato A, Bartoletti-Stella A, Parchi P, van Duijn C, Pocchiari M. Age at onset of genetic (E200K) and sporadic Creutzfeldt-Jakob diseases is modulated by the CYP4X1 gene. J Neurol Neurosurg Psychiatry 2018; 89:1243-1249. [PMID: 30032116 DOI: 10.1136/jnnp-2018-318756] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 06/13/2018] [Accepted: 06/13/2018] [Indexed: 01/29/2023]
Abstract
OBJECTIVES The Glu to Lys change at codon 200 (E200K) of the PRNP gene is the most frequent mutation associated to genetic Creutzfeldt-Jakob disease (CJD) and the only one responsible for geographical clusters. Patients carrying this mutation develop disease at different ages and show variable clinical phenotypes that are not affected by the methione/valine polymorphism at codon 129 of the PRNP gene suggesting the influence of other factors. The objective of this study is to look for genes other than PRNP that might be responsible of this variability. METHODS We searched for other genes by performing genome-wide analyses (GWA) on 19 patients with genetic CJD and 18 healthy subjects carrying the E200K mutation of PRNP and belonging to the Calabrian cluster in Italy. We then validate this result in 32 patients with E200K CJD from non-cluster areas and 259 patients with sporadic CJD referred to the Italian CJD national registry. RESULTS AND CONCLUSIONS We identified two single nucleotide polymorphisms on the CYP4X1 gene locus as candidate disease modifiers in patients with E200K CJD of the cluster area and confirmed this finding in 32 patients with E200K CJD from non-cluster areas and 259 patients with sporadic CJD. Our results indicate that the CYP4X1 gene modulates the onset of disease in patients with E200K genetic and sporadic CJD. This finding improves our understanding on the pathogenesis of CJD, suggests new targets for developing novel therapeutic strategies and might be useful for the stratification of patients in future preventive treatment trials.
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Affiliation(s)
- Anna Poleggi
- Department of Neuroscience, Istituto Superiore di Sanità, Roma, Italy
| | - Sven van der Lee
- Genetic Epidemiology Unit, Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Sabina Capellari
- IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy.,Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
| | - Maria Puopolo
- Department of Neuroscience, Istituto Superiore di Sanità, Roma, Italy
| | - Anna Ladogana
- Department of Neuroscience, Istituto Superiore di Sanità, Roma, Italy
| | | | - Debora Lia
- Department of Neuroscience, Istituto Superiore di Sanità, Roma, Italy
| | - Alessia Formato
- Department of Neuroscience, Istituto Superiore di Sanità, Roma, Italy
| | - Anna Bartoletti-Stella
- IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy.,Department of Biomedical and NeuroMotor Sciences (DIBINEM), University of Bologna, Bologna, Italy
| | - Piero Parchi
- IRCCS Institute of Neurological Sciences of Bologna, Bologna, Italy.,Department of Diagnostic Experimental and Specialty Medicine (DIMES), University of Bologna, Bologna, Italy
| | - Cornelia van Duijn
- Genetic Epidemiology Unit, Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands.,Translational Epidemiology, Faculty Science, Leiden University, Leiden, The Netherlands
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Lia D, Reyes A, de Melo Campos JTA, Piolot T, Baijer J, Radicella JP, Campalans A. Mitochondrial maintenance under oxidative stress depends on mitochondrially localised α-OGG1. J Cell Sci 2018; 131:jcs.213538. [PMID: 29848661 DOI: 10.1242/jcs.213538] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 05/21/2018] [Indexed: 12/18/2022] Open
Abstract
Accumulation of 8-oxoguanine (8-oxoG) in mitochondrial DNA and mitochondrial dysfunction have been observed in cells deficient for the DNA glycosylase OGG1 when exposed to oxidative stress. In human cells, up to eight mRNAs for OGG1 can be generated by alternative splicing and it is still unclear which of them codes for the protein that ensures the repair of 8-oxoG in mitochondria. Here, we show that the α-OGG1 isoform, considered up to now to be exclusively nuclear, has a functional mitochondrial-targeting sequence and is imported into mitochondria. We analyse the sub-mitochondrial localisation of α-OGG1 with unprecedented resolution and show that this DNA glycosylase is associated with DNA in mitochondrial nucleoids. We show that the presence of α-OGG1 inside mitochondria and its enzymatic activity are required to preserve the mitochondrial network in cells exposed to oxidative stress. Altogether, these results unveil a new role of α-OGG1 in the mitochondria and indicate that the same isoform ensures the repair of 8-oxoG in both nuclear and mitochondrial genomes. The activity of α-OGG1 in mitochondria is sufficient for the recovery of organelle function after oxidative stress.
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Affiliation(s)
- Debora Lia
- Institut de Biologie François Jacob (IBFJ), Institute of Cellular and Molecular Radiobiology, CEA, UMR967 INSERM, 96265 Fontenay aux Roses, France.,Université Paris Diderot/Université Paris-Sud, 96265 Fontenay aux Roses, France
| | - Aurelio Reyes
- MRC Mitochondrial Biology Unit, University of Cambridge, Cambridge CB2 0XY, United Kingdom
| | - Julliane Tamara Araújo de Melo Campos
- Institut de Biologie François Jacob (IBFJ), Institute of Cellular and Molecular Radiobiology, CEA, UMR967 INSERM, 96265 Fontenay aux Roses, France.,Laboratório de Biologia Molecular e Genômica, Departamento de Biologia Celular e Genética, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, RN 59072-970, Brazil
| | - Tristan Piolot
- Institut Curie, CNRS UMR3215, INSERM U934, 75248 Paris, France
| | - Jan Baijer
- Institut de Biologie François Jacob (IBFJ), Institute of Cellular and Molecular Radiobiology, CEA, UMR967 INSERM, 96265 Fontenay aux Roses, France.,Université Paris Diderot/Université Paris-Sud, 96265 Fontenay aux Roses, France
| | - J Pablo Radicella
- Institut de Biologie François Jacob (IBFJ), Institute of Cellular and Molecular Radiobiology, CEA, UMR967 INSERM, 96265 Fontenay aux Roses, France.,Université Paris Diderot/Université Paris-Sud, 96265 Fontenay aux Roses, France
| | - Anna Campalans
- Institut de Biologie François Jacob (IBFJ), Institute of Cellular and Molecular Radiobiology, CEA, UMR967 INSERM, 96265 Fontenay aux Roses, France .,Université Paris Diderot/Université Paris-Sud, 96265 Fontenay aux Roses, France
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