α‐Synuclein Seed Amplification in CSF and Brain from Patients with Different Brain Distributions of Pathological α‐Synuclein in the Context of Co‐Pathology and Non‐LBD Diagnoses

Objective The purpose of this study was to determine the sensitivity and specificity of α‐synuclein seed amplification assay (αSyn‐SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy‐confirmed patients with different distributions of pathological αSyn, co‐pathologies, and clinical...

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Published inAnnals of neurology Vol. 92; no. 4; pp. 650 - 662
Main Authors Arnold, Moriah R., Coughlin, David G., Brumbach, Barbara H., Smirnov, Denis S., Concha‐Marambio, Luis, Farris, Carly M., Ma, Yihua, Kim, Yongya, Wilson, Edward N., Kaye, Jeffrey A., Hiniker, Annie, Woltjer, Randy L., Galasko, Doug R., Quinn, Joseph F.
Format Journal Article
LanguageEnglish
Published Hoboken, USA John Wiley & Sons, Inc 01.10.2022
Wiley Subscription Services, Inc
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Online AccessGet full text
ISSN0364-5134
1531-8249
1531-8249
DOI10.1002/ana.26453

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Abstract Objective The purpose of this study was to determine the sensitivity and specificity of α‐synuclein seed amplification assay (αSyn‐SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy‐confirmed patients with different distributions of pathological αSyn, co‐pathologies, and clinical diagnoses. Methods The αSyn‐SAA was used to test antemortem CSF samples from 119 subjects with a variety of clinical syndromes and standardized neuropathological examinations from Oregon Health and Science University (OHSU) and University of California San Diego (UCSD; 56 additional postmortem CSF samples available). The αSyn‐SAA was also applied to frontal cortex and amygdala homogenates. Sensitivity and specificity were compared across distributions of αSyn pathology. Clinical data and co‐pathologies were compared across αSyn‐SAA positive and negative groups. Results Fifty‐three individuals without and 66 with αSyn‐pathology (neocortical [n = 38], limbic [n = 7], and amygdala‐predominant [n = 21]) were included. There was a sensitivity of 97.8% and specificity of 98.1% of the αSyn‐SAA to identify patients with limbic/neocortical pathology from antemortem CSF. Sensitivity to detect amygdala‐predominant pathology was only 14.3%. Postmortem CSF and brain tissue αSyn‐SAA analyses also showed higher assay positivity in samples from limbic/neocortical cases. Interpretation CSF αSyn‐SAA reliably identifies αSyn seeds in patients with diffuse αSyn pathology in the context of co‐pathology and non‐Lewy body disease (LBD) diagnoses. The analysis of brain homogenates suggests that pathological αSyn in the amygdala might differ from pathological αSyn in the frontal cortex. The αSyn‐SAA might facilitate the differential diagnosis of dementias with mixed pathologies. ANN NEUROL 2022;92:650–662
AbstractList The purpose of this study was to determine the sensitivity and specificity of α-synuclein seed amplification assay (αSyn-SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy-confirmed patients with different distributions of pathological αSyn, co-pathologies, and clinical diagnoses. The αSyn-SAA was used to test antemortem CSF samples from 119 subjects with a variety of clinical syndromes and standardized neuropathological examinations from Oregon Health and Science University (OHSU) and University of California San Diego (UCSD; 56 additional postmortem CSF samples available). The αSyn-SAA was also applied to frontal cortex and amygdala homogenates. Sensitivity and specificity were compared across distributions of αSyn pathology. Clinical data and co-pathologies were compared across αSyn-SAA positive and negative groups. Fifty-three individuals without and 66 with αSyn-pathology (neocortical [n = 38], limbic [n = 7], and amygdala-predominant [n = 21]) were included. There was a sensitivity of 97.8% and specificity of 98.1% of the αSyn-SAA to identify patients with limbic/neocortical pathology from antemortem CSF. Sensitivity to detect amygdala-predominant pathology was only 14.3%. Postmortem CSF and brain tissue αSyn-SAA analyses also showed higher assay positivity in samples from limbic/neocortical cases. CSF αSyn-SAA reliably identifies αSyn seeds in patients with diffuse αSyn pathology in the context of co-pathology and non-Lewy body disease (LBD) diagnoses. The analysis of brain homogenates suggests that pathological αSyn in the amygdala might differ from pathological αSyn in the frontal cortex. The αSyn-SAA might facilitate the differential diagnosis of dementias with mixed pathologies. ANN NEUROL 2022;92:650-662.
The purpose of this study was to determine the sensitivity and specificity of α-synuclein seed amplification assay (αSyn-SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy-confirmed patients with different distributions of pathological αSyn, co-pathologies, and clinical diagnoses.OBJECTIVEThe purpose of this study was to determine the sensitivity and specificity of α-synuclein seed amplification assay (αSyn-SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy-confirmed patients with different distributions of pathological αSyn, co-pathologies, and clinical diagnoses.The αSyn-SAA was used to test antemortem CSF samples from 119 subjects with a variety of clinical syndromes and standardized neuropathological examinations from Oregon Health and Science University (OHSU) and University of California San Diego (UCSD; 56 additional postmortem CSF samples available). The αSyn-SAA was also applied to frontal cortex and amygdala homogenates. Sensitivity and specificity were compared across distributions of αSyn pathology. Clinical data and co-pathologies were compared across αSyn-SAA positive and negative groups.METHODSThe αSyn-SAA was used to test antemortem CSF samples from 119 subjects with a variety of clinical syndromes and standardized neuropathological examinations from Oregon Health and Science University (OHSU) and University of California San Diego (UCSD; 56 additional postmortem CSF samples available). The αSyn-SAA was also applied to frontal cortex and amygdala homogenates. Sensitivity and specificity were compared across distributions of αSyn pathology. Clinical data and co-pathologies were compared across αSyn-SAA positive and negative groups.Fifty-three individuals without and 66 with αSyn-pathology (neocortical [n = 38], limbic [n = 7], and amygdala-predominant [n = 21]) were included. There was a sensitivity of 97.8% and specificity of 98.1% of the αSyn-SAA to identify patients with limbic/neocortical pathology from antemortem CSF. Sensitivity to detect amygdala-predominant pathology was only 14.3%. Postmortem CSF and brain tissue αSyn-SAA analyses also showed higher assay positivity in samples from limbic/neocortical cases.RESULTSFifty-three individuals without and 66 with αSyn-pathology (neocortical [n = 38], limbic [n = 7], and amygdala-predominant [n = 21]) were included. There was a sensitivity of 97.8% and specificity of 98.1% of the αSyn-SAA to identify patients with limbic/neocortical pathology from antemortem CSF. Sensitivity to detect amygdala-predominant pathology was only 14.3%. Postmortem CSF and brain tissue αSyn-SAA analyses also showed higher assay positivity in samples from limbic/neocortical cases.CSF αSyn-SAA reliably identifies αSyn seeds in patients with diffuse αSyn pathology in the context of co-pathology and non-Lewy body disease (LBD) diagnoses. The analysis of brain homogenates suggests that pathological αSyn in the amygdala might differ from pathological αSyn in the frontal cortex. The αSyn-SAA might facilitate the differential diagnosis of dementias with mixed pathologies. ANN NEUROL 2022;92:650-662.INTERPRETATIONCSF αSyn-SAA reliably identifies αSyn seeds in patients with diffuse αSyn pathology in the context of co-pathology and non-Lewy body disease (LBD) diagnoses. The analysis of brain homogenates suggests that pathological αSyn in the amygdala might differ from pathological αSyn in the frontal cortex. The αSyn-SAA might facilitate the differential diagnosis of dementias with mixed pathologies. ANN NEUROL 2022;92:650-662.
Objective The purpose of this study was to determine the sensitivity and specificity of α‐synuclein seed amplification assay (αSyn‐SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy‐confirmed patients with different distributions of pathological αSyn, co‐pathologies, and clinical diagnoses. Methods The αSyn‐SAA was used to test antemortem CSF samples from 119 subjects with a variety of clinical syndromes and standardized neuropathological examinations from Oregon Health and Science University (OHSU) and University of California San Diego (UCSD; 56 additional postmortem CSF samples available). The αSyn‐SAA was also applied to frontal cortex and amygdala homogenates. Sensitivity and specificity were compared across distributions of αSyn pathology. Clinical data and co‐pathologies were compared across αSyn‐SAA positive and negative groups. Results Fifty‐three individuals without and 66 with αSyn‐pathology (neocortical [n = 38], limbic [n = 7], and amygdala‐predominant [n = 21]) were included. There was a sensitivity of 97.8% and specificity of 98.1% of the αSyn‐SAA to identify patients with limbic/neocortical pathology from antemortem CSF. Sensitivity to detect amygdala‐predominant pathology was only 14.3%. Postmortem CSF and brain tissue αSyn‐SAA analyses also showed higher assay positivity in samples from limbic/neocortical cases. Interpretation CSF αSyn‐SAA reliably identifies αSyn seeds in patients with diffuse αSyn pathology in the context of co‐pathology and non‐Lewy body disease (LBD) diagnoses. The analysis of brain homogenates suggests that pathological αSyn in the amygdala might differ from pathological αSyn in the frontal cortex. The αSyn‐SAA might facilitate the differential diagnosis of dementias with mixed pathologies. ANN NEUROL 2022;92:650–662
ObjectiveThe purpose of this study was to determine the sensitivity and specificity of α‐synuclein seed amplification assay (αSyn‐SAA) in antemortem and postmortem cerebrospinal fluid (CSF) of autopsy‐confirmed patients with different distributions of pathological αSyn, co‐pathologies, and clinical diagnoses.MethodsThe αSyn‐SAA was used to test antemortem CSF samples from 119 subjects with a variety of clinical syndromes and standardized neuropathological examinations from Oregon Health and Science University (OHSU) and University of California San Diego (UCSD; 56 additional postmortem CSF samples available). The αSyn‐SAA was also applied to frontal cortex and amygdala homogenates. Sensitivity and specificity were compared across distributions of αSyn pathology. Clinical data and co‐pathologies were compared across αSyn‐SAA positive and negative groups.ResultsFifty‐three individuals without and 66 with αSyn‐pathology (neocortical [n = 38], limbic [n = 7], and amygdala‐predominant [n = 21]) were included. There was a sensitivity of 97.8% and specificity of 98.1% of the αSyn‐SAA to identify patients with limbic/neocortical pathology from antemortem CSF. Sensitivity to detect amygdala‐predominant pathology was only 14.3%. Postmortem CSF and brain tissue αSyn‐SAA analyses also showed higher assay positivity in samples from limbic/neocortical cases.InterpretationCSF αSyn‐SAA reliably identifies αSyn seeds in patients with diffuse αSyn pathology in the context of co‐pathology and non‐Lewy body disease (LBD) diagnoses. The analysis of brain homogenates suggests that pathological αSyn in the amygdala might differ from pathological αSyn in the frontal cortex. The αSyn‐SAA might facilitate the differential diagnosis of dementias with mixed pathologies. ANN NEUROL 2022;92:650–662
Author Hiniker, Annie
Concha‐Marambio, Luis
Galasko, Doug R.
Woltjer, Randy L.
Quinn, Joseph F.
Ma, Yihua
Wilson, Edward N.
Brumbach, Barbara H.
Kim, Yongya
Smirnov, Denis S.
Kaye, Jeffrey A.
Coughlin, David G.
Arnold, Moriah R.
Farris, Carly M.
AuthorAffiliation 2 Department of Neurosciences, University of California San Diego
7 Department of Pathology, University of California San Diego
5 Department of Neurology & Neurological Sciences, Stanford University
3 Biostatistics and Design Program, Oregon Health and Science University
8 Department of Pathology, Oregon Health and Science University
1 Medical Scientist Training Program, Oregon Health and Science University
4 Amprion Inc
6 Department of Neurology, Oregon Health and Science University
9 Portland VA Medical Center, Parkinson’s Disease Research Education and Clinical Care Center (PADRECC)
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/35808984$$D View this record in MEDLINE/PubMed
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2022 American Neurological Association
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Notes Moriah R. Arnold and David G. Coughlin contributed equally to this work.
Correction added on Aug 5, 2022, after first online publication: Author contribution text is revised. ORCID ids were added for the authors.
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MRA, DGC, DSS, LCM, DRG, and JFQ contributed to the conception and design of the study; MRA, DGC, BHB, DSS, LCM, CMF, YM, YK, ENW, JAK, AH, and RLW contributed to the acquisition and analysis of data; MRA, DGC, BHB, LCM, DRG, and JFQ contributed to drafting the text or preparing the figures.
authors contributed equally
Author Contributions
ORCID 0000-0003-0640-5247
0000-0002-9454-8389
0000-0002-0055-6610
0000-0002-5916-7978
0000-0002-9971-3478
0000-0002-8277-8531
0000-0002-4501-3660
0000-0001-6195-3241
0000-0002-9768-313X
OpenAccessLink https://www.ncbi.nlm.nih.gov/pmc/articles/9489647
PMID 35808984
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Snippet Objective The purpose of this study was to determine the sensitivity and specificity of α‐synuclein seed amplification assay (αSyn‐SAA) in antemortem and...
The purpose of this study was to determine the sensitivity and specificity of α-synuclein seed amplification assay (αSyn-SAA) in antemortem and postmortem...
ObjectiveThe purpose of this study was to determine the sensitivity and specificity of α‐synuclein seed amplification assay (αSyn‐SAA) in antemortem and...
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SubjectTerms alpha-Synuclein - metabolism
Amplification
Amygdala
Autopsies
Autopsy
Brain
Brain - pathology
Cerebrospinal fluid
Cortex (frontal)
Differential diagnosis
Humans
Lewy bodies
Lewy body disease
Pathology
Patients
Seeds
Sensitivity
Sensitivity and Specificity
Synuclein
Tissue analysis
Title α‐Synuclein Seed Amplification in CSF and Brain from Patients with Different Brain Distributions of Pathological α‐Synuclein in the Context of Co‐Pathology and Non‐LBD Diagnoses
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fana.26453
https://www.ncbi.nlm.nih.gov/pubmed/35808984
https://www.proquest.com/docview/2715399201
https://www.proquest.com/docview/2687724028
https://pubmed.ncbi.nlm.nih.gov/PMC9489647
Volume 92
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