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Mehrabian S, Thonberg H, Raycheva M, Lilius L, Stoyanova K, Forsell C, Cavallin L, Nesheva D, Westman E, Toncheva D, Traykov L, Winblad B, Graff C. Phenotypic variability and neuropsychological findings associated with C9orf72 repeat expansions in a Bulgarian dementia cohort. PLoS One 2018; 13:e0208383. [PMID: 30550541 PMCID: PMC6294384 DOI: 10.1371/journal.pone.0208383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 11/16/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND The GGGGCC repeat expansion in the C9orf72 gene was recently identified as a major cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) in several European populations. The objective of this study was to determine the frequency of C9orf72 repeat expansions in a Bulgarian dementia cohort and to delineate the associated clinical features. METHODS AND FINDINGS PCR-based assessments of the C9orf72 hexanucleotide repeat expansion in all study samples (including 82 FTD, 37 Alzheimer's disease (AD), and 16 other neurodegenerative/dementia disorder cases) were performed. We report the clinical, neuropsychological, and neuroimaging findings obtained for the C9orf72 repeat expansion carriers. Of the 135 cases screened, 3/82 (3.7%) of all FTD cases and 1/37 (2.7%) of all clinical AD cases had a C9orf72 repeat expansion. In this cohort, the C9orf72 pathological expansion was found in clinical diagnoses bridging the FTD, parkinsonism, ALS and AD spectrum. Interestingly, we showed early writing errors without aphasia in two subjects with C9orf72 expansions. CONCLUSIONS This study represents the first genetic screening for C9orf72 repeat expansions in a Bulgarian dementia cohort. The C9orf72 repeat expansion does not appear to be a common cause of FTD and related disorders. This report confirms the notion that C9orf72 repeat expansions underlie a broad spectrum of neurodegenerative phenotypes. Relatively isolated agraphia in two cases with C9orf72 repeat expansions is a strong motivation to provide detailed and sophisticated oral and written language assessments that can be used to more precisely characterize early cognitive deficits in these heterogeneous conditions.
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Affiliation(s)
- Shima Mehrabian
- Depatment of Neurology, UH “Alexandrovska”, Medical University-Sofia, Sofia, Bulgaria
- * E-mail:
| | - Håkan Thonberg
- Karolinska Institutet, Dept NVS, Division for Neurogeriatrics, Bioclinicum, Akademiska stråket, Solna, Sweden
- Karolinska University Hospital, Theme Aging, Genetics Unit, Solna, Sweden
| | - Margarita Raycheva
- Depatment of Neurology, UH “Alexandrovska”, Medical University-Sofia, Sofia, Bulgaria
| | - Lena Lilius
- Karolinska Institutet, Dept NVS, Division for Neurogeriatrics, Bioclinicum, Akademiska stråket, Solna, Sweden
- Karolinska University Hospital, Theme Aging, Genetics Unit, Solna, Sweden
| | - Katya Stoyanova
- Depatment of Neurology, UH “Alexandrovska”, Medical University-Sofia, Sofia, Bulgaria
| | - Charlotte Forsell
- Karolinska Institutet, Dept NVS, Division for Neurogeriatrics, Bioclinicum, Akademiska stråket, Solna, Sweden
- Karolinska University Hospital, Theme Aging, Genetics Unit, Solna, Sweden
| | - Lena Cavallin
- Karolinska Institutet, Department of Clinical Neuroscience, Karolinska University Hospital, Department of Radiology, Stockholm, Sweden
| | | | - Eric Westman
- Karolinska Institutet, Department of Neurobiology, Care Sciences and Society (NVS), Center for Alzheimer Research, Division of Clinical Geriatrics, Neo, Huddinge, Sweden
| | - Draga Toncheva
- Department of Genetics, Medical University-Sofia, Sofia, Bulgaria
| | - Latchezar Traykov
- Depatment of Neurology, UH “Alexandrovska”, Medical University-Sofia, Sofia, Bulgaria
| | - Bengt Winblad
- Karolinska University Hospital, Theme Aging, Clinical Trial Unit, Stockholm, Sweden
- Karolinska Institutet, Department NVS, Center for Alzheimer Research, Division of Neurogeriatrics, Huddinge, Sweden
| | - Caroline Graff
- Karolinska Institutet, Dept NVS, Division for Neurogeriatrics, Bioclinicum, Akademiska stråket, Solna, Sweden
- Karolinska University Hospital, Theme Aging, Genetics Unit, Solna, Sweden
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Mitropoulos K, Merkouri Papadima E, Xiromerisiou G, Balasopoulou A, Charalampidou K, Galani V, Zafeiri KV, Dardiotis E, Ralli S, Deretzi G, John A, Kydonopoulou K, Papadopoulou E, di Pardo A, Akcimen F, Loizedda A, Dobričić V, Novaković I, Kostić VS, Mizzi C, Peters BA, Basak N, Orrù S, Kiskinis E, Cooper DN, Gerou S, Drmanac R, Bartsakoulia M, Tsermpini EE, Hadjigeorgiou GM, Ali BR, Katsila T, Patrinos GP. Genomic variants in the FTO gene are associated with sporadic amyotrophic lateral sclerosis in Greek patients. Hum Genomics 2017; 11:30. [PMID: 29216901 PMCID: PMC5721583 DOI: 10.1186/s40246-017-0126-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Accepted: 11/17/2017] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Amyotrophic lateral sclerosis (ALS) is a devastating disease whose complex pathology has been associated with a strong genetic component in the context of both familial and sporadic disease. Herein, we adopted a next-generation sequencing approach to Greek patients suffering from sporadic ALS (together with their healthy counterparts) in order to explore further the genetic basis of sporadic ALS (sALS). RESULTS Whole-genome sequencing analysis of Greek sALS patients revealed a positive association between FTO and TBC1D1 gene variants and sALS. Further, linkage disequilibrium analyses were suggestive of a specific disease-associated haplotype for FTO gene variants. Genotyping for these variants was performed in Greek, Sardinian, and Turkish sALS patients. A lack of association between FTO and TBC1D1 variants and sALS in patients of Sardinian and Turkish descent may suggest a founder effect in the Greek population. FTO was found to be highly expressed in motor neurons, while in silico analyses predicted an impact on FTO and TBC1D1 mRNA splicing for the genomic variants in question. CONCLUSIONS To our knowledge, this is the first study to present a possible association between FTO gene variants and the genetic etiology of sALS. In addition, the next-generation sequencing-based genomics approach coupled with the two-step validation strategy described herein has the potential to be applied to other types of human complex genetic disorders in order to identify variants of clinical significance.
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Affiliation(s)
| | - Eleni Merkouri Papadima
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | | | - Angeliki Balasopoulou
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | - Kyriaki Charalampidou
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | - Vasiliki Galani
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | | | | | - Styliani Ralli
- School of Medicine, University of Thessaly, Larisa, Greece
| | | | - Anne John
- Department of Pathology, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, UAE
| | | | | | - Alba di Pardo
- Departments of Neurology and Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Fulya Akcimen
- Suna and Inan Kirac Foundation, NDAL, Bogazici University, Istanbul, Turkey
| | - Annalisa Loizedda
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy.,CNR IRGB, Cagliari, Italy
| | - Valerija Dobričić
- Institute of Neurology CCS, School of Medicine, University of Belgrade, Belgrade, Serbia
| | - Ivana Novaković
- Institute of Neurology CCS, School of Medicine, University of Belgrade, Belgrade, Serbia.,Faculty of Medicine, Institute of Human Genetics, University of Belgrade, Belgrade, Serbia
| | - Vladimir S Kostić
- Institute of Neurology CCS, School of Medicine, University of Belgrade, Belgrade, Serbia
| | - Clint Mizzi
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | - Brock A Peters
- Complete Genomics Inc., Mountain View, CA, USA.,BGI Shenzhen, Shenzhen, People's Republic of China
| | - Nazli Basak
- Suna and Inan Kirac Foundation, NDAL, Bogazici University, Istanbul, Turkey
| | - Sandro Orrù
- Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Evangelos Kiskinis
- Departments of Neurology and Physiology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - David N Cooper
- Institute of Medical Genetics, Cardiff University, Cardiff, UK
| | - Spyridon Gerou
- ANALYSI Diagnostic Laboratories S.A, Thessaloniki, Greece
| | | | - Marina Bartsakoulia
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | - Evangelia-Eirini Tsermpini
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | | | - Bassam R Ali
- Department of Pathology, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, UAE
| | - Theodora Katsila
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece
| | - George P Patrinos
- Department of Pharmacy, University of Patras School of Health Sciences, Campus, Rion, GR-26504, Patras, Greece. .,Department of Pathology, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, UAE.
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Geiger JT, Arthur KC, Dawson TM, Rosenthal LS, Pantelyat A, Albert M, Hillis AE, Crain B, Pletnikova O, Troncoso JC, Scholz SW. C9orf72 Hexanucleotide Repeat Analysis in Cases with Pathologically Confirmed Dementia with Lewy Bodies. NEURODEGENER DIS 2016; 16:370-2. [PMID: 27241037 DOI: 10.1159/000445872] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 04/01/2016] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Dementia with Lewy bodies (DLB) is the second most common neurodegenerative dementia affecting the elderly. The GGGGCC hexanucleotide expansion mutation at the C9orf72 locus has been identified as a major cause of amyotrophic lateral sclerosis and frontotemporal dementia, raising the question of whether this mutation is a factor in DLB. Furthermore, a small number of clinically diagnosed DLB patients have previously been reported to carry the pathologic C9orf72 hexanucleotide repeat expansion. OBJECTIVE To explore whether the C9orf72 mutation is present in pathologically confirmed DLB patients. METHODS We screened a cohort of 111 definite DLB cases with extensive Lewy body pathology for the C9orf72 hexanucleotide repeat expansion using the repeat-primed polymerase chain reaction assay. RESULTS No pathogenic expansions of the C9orf72 hexanucleotide repeat were found, suggesting that there is no causal relationship between C9orf72 and DLB. CONCLUSION Our data illustrate that C9orf72 screening of clinically diagnosed DLB patients should only be considered in cases with a family history of motor neuron disease or frontotemporal dementia to distinguish between mimic diseases.
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Affiliation(s)
- Joshua T Geiger
- Neurodegenerative Diseases Research Unit, National Institute of Neurological Disorders and Stroke, Bethesda, Md., The Commonwealth Medical College, Scranton, Pa., USA
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