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      A genome-wide association study in multiple system atrophy

      research-article
      , MD, PhD, , MD, PhD , , PhD, , PhD, , MS, , MS, , MD, , PhD, , MD, , PhD, , MD, , MD, , MD, , MD, PhD, , MD, PhD, , MD, PhD, , MD, PhD, , MD, PhD, , MD, PhD, , PhD, , PhD, , MD, , MD, , MD, PhD, , MD, , MD, , MD, , MD, , MD, , MD, , MD, , MD, PhD, , MD, , MD, , MD, , MD, PhD, , MD, , MD, PhD, , PhD, MD(Hon), , MD, , MD, PhD, , MD, , MD, PhD, , PhD, , MD, PhD
      , MD, PhD (Collab), , MD (Collab), , MD (Collab)
      Neurology
      Lippincott Williams & Wilkins

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          Abstract

          Objective:

          To identify genetic variants that play a role in the pathogenesis of multiple system atrophy (MSA), we undertook a genome-wide association study (GWAS).

          Methods:

          We performed a GWAS with >5 million genotyped and imputed single nucleotide polymorphisms (SNPs) in 918 patients with MSA of European ancestry and 3,864 controls. MSA cases were collected from North American and European centers, one third of which were neuropathologically confirmed.

          Results:

          We found no significant loci after stringent multiple testing correction. A number of regions emerged as potentially interesting for follow-up at p < 1 × 10 −6, including SNPs in the genes FBXO47, ELOVL7, EDN1, and MAPT. Contrary to previous reports, we found no association of the genes SNCA and COQ2 with MSA.

          Conclusions:

          We present a GWAS in MSA. We have identified several potentially interesting gene loci, including the MAPT locus, whose significance will have to be evaluated in a larger sample set. Common genetic variation in SNCA and COQ2 does not seem to be associated with MSA. In the future, additional samples of well-characterized patients with MSA will need to be collected to perform a larger MSA GWAS, but this initial study forms the basis for these next steps.

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          Most cited references20

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          Genotype imputation.

          Genotype imputation is now an essential tool in the analysis of genome-wide association scans. This technique allows geneticists to accurately evaluate the evidence for association at genetic markers that are not directly genotyped. Genotype imputation is particularly useful for combining results across studies that rely on different genotyping platforms but also increases the power of individual scans. Here, we review the history and theoretical underpinnings of the technique. To illustrate performance of the approach, we summarize results from several gene mapping studies. Finally, we preview the role of genotype imputation in an era when whole genome resequencing is becoming increasingly common.
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            The future of genetic studies of complex human diseases.

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              Alpha-synuclein immunoreactivity in glial cytoplasmic inclusions in multiple system atrophy.

              Lewy bodies in Parkinson' s disease (PD) are strongly immunoreactive with antibodies against alpha-synuclein, which is mutated in some familial cases of the disease. We carried out immunohistochemical examinations of the brains of multiple system atrophy (MSA) patients using anti-alpha-synuclein antibodies. Strong alpha-synuclein immunoreactivity was found in glial cytoplasmic inclusions (GCIs), which are of oligodendroglial origin and occur exclusively in MSA. Alpha-synuclein-immunoreactive neuronal cytoplasmic inclusions (NCIs) were also found occasionally in the substantia nigra, pontine and inferior olivary nuclei, and dentate fascia. These findings indicate that alpha-synuclein is also a major component of GCIs and NCIs in MSA and strongly suggest that alpha-synuclein aggregation is a common process in certain neurodegenerative diseases, including PD and MSA.
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                Author and article information

                Contributors
                Journal
                Neurology
                Neurology
                neurology
                neur
                neurology
                NEUROLOGY
                Neurology
                Lippincott Williams & Wilkins (Hagerstown, MD )
                0028-3878
                1526-632X
                11 October 2016
                11 October 2016
                : 87
                : 15
                : 1591-1598
                Affiliations
                Authors' affiliations are listed at the end of the article.
                Author notes
                Correspondence to Dr. Houlden: h.houlden@ 123456ucl.ac.uk or Dr. Scholz: sonja.scholz@ 123456nih.gov

                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. The Article Processing Charge was paid by Wellcome Trust.

                Coinvestigators are listed at Neurology.org.

                Article
                NEUROLOGY2016719088
                10.1212/WNL.0000000000003221
                5067544
                27629089
                f4c646ad-4cf0-4038-9df3-133e7e491496
                © 2016 American Academy of Neurology

                This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 17 January 2016
                : 15 June 2016
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