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Córdova-Palomera A, Siffel C, DeBoever C, Wong E, Diogo D, Szalma S. Assessing the potential of polygenic scores to strengthen medical risk prediction models of COVID-19. PLoS One 2023; 18:e0285991. [PMID: 37235597 DOI: 10.1371/journal.pone.0285991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 05/05/2023] [Indexed: 05/28/2023] Open
Abstract
As findings on the epidemiological and genetic risk factors for coronavirus disease-19 (COVID-19) continue to accrue, their joint power and significance for prospective clinical applications remains virtually unexplored. Severity of symptoms in individuals affected by COVID-19 spans a broad spectrum, reflective of heterogeneous host susceptibilities across the population. Here, we assessed the utility of epidemiological risk factors to predict disease severity prospectively, and interrogated genetic information (polygenic scores) to evaluate whether they can provide further insights into symptom heterogeneity. A standard model was trained to predict severe COVID-19 based on principal component analysis and logistic regression based on information from eight known medical risk factors for COVID-19 measured before 2018. In UK Biobank participants of European ancestry, the model achieved a relatively high performance (area under the receiver operating characteristic curve ~90%). Polygenic scores for COVID-19 computed from summary statistics of the Covid19 Host Genetics Initiative displayed significant associations with COVID-19 in the UK Biobank (p-values as low as 3.96e-9, all with R2 under 1%), but were unable to robustly improve predictive performance of the non-genetic factors. However, error analysis of the non-genetic models suggested that affected individuals misclassified by the medical risk factors (predicted low risk but actual high risk) display a small but consistent increase in polygenic scores. Overall, the results indicate that simple models based on health-related epidemiological factors measured years before COVID-19 onset can achieve high predictive power. Associations between COVID-19 and genetic factors were statistically robust, but currently they have limited predictive power for translational settings. Despite that, the outcomes also suggest that severely affected cases with a medical history profile of low risk might be partly explained by polygenic factors, prompting development of boosted COVID-19 polygenic models based on new data and tools to aid risk-prediction.
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Affiliation(s)
- Aldo Córdova-Palomera
- Takeda Development Center Americas, Inc., San Diego, California, United States of America
| | - Csaba Siffel
- Takeda Development Center Americas, Inc., San Diego, California, United States of America
| | - Chris DeBoever
- Takeda Development Center Americas, Inc., San Diego, California, United States of America
| | - Emily Wong
- Takeda Development Center Americas, Inc., San Diego, California, United States of America
| | - Dorothée Diogo
- Takeda Development Center Americas, Inc., Cambridge, Massachusetts, United States of America
| | - Sandor Szalma
- Takeda Development Center Americas, Inc., San Diego, California, United States of America
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2
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Sadaei HJ, Cordova-Palomera A, Lee J, Padmanabhan J, Chen SF, Wineinger NE, Dias R, Prilutsky D, Szalma S, Torkamani A. Genetically-informed prediction of short-term Parkinson's disease progression. NPJ Parkinsons Dis 2022; 8:143. [PMID: 36302787 PMCID: PMC9613892 DOI: 10.1038/s41531-022-00412-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 10/11/2022] [Indexed: 11/22/2022] Open
Abstract
Parkinson's disease (PD) treatments modify disease symptoms but have not been shown to slow progression, characterized by gradual and varied motor and non-motor changes overtime. Variation in PD progression hampers clinical research, resulting in long and expensive clinical trials prone to failure. Development of models for short-term PD progression prediction could be useful for shortening the time required to detect disease-modifying drug effects in clinical studies. PD progressors were defined by an increase in MDS-UPDRS scores at 12-, 24-, and 36-months post-baseline. Using only baseline features, PD progression was separately predicted across all timepoints and MDS-UPDRS subparts in independent, optimized, XGBoost models. These predictions plus baseline features were combined into a meta-predictor for 12-month MDS UPDRS Total progression. Data from the Parkinson's Progression Markers Initiative (PPMI) were used for training with independent testing on the Parkinson's Disease Biomarkers Program (PDBP) cohort. 12-month PD total progression was predicted with an F-measure 0.77, ROC AUC of 0.77, and PR AUC of 0.76 when tested on a hold-out PPMI set. When tested on PDBP we achieve a F-measure 0.75, ROC AUC of 0.74, and PR AUC of 0.73. Exclusion of genetic predictors led to the greatest loss in predictive accuracy; ROC AUC of 0.66, PR AUC of 0.66-0.68 for both PPMI and PDBP testing. Short-term PD progression can be predicted with a combination of survey-based, neuroimaging, physician examination, and genetic predictors. Dissection of the interplay between genetic risk, motor symptoms, non-motor symptoms, and longer-term expected rates of progression enable generalizable predictions.
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Affiliation(s)
- Hossein J Sadaei
- Scripps Research Translational Institute, La Jolla, CA, 92037, USA
- Department of Integrative Structural and Computational Biology, Scripps Research, La Jolla, CA, 92037, USA
| | | | - Jonghun Lee
- Takeda Development Center Americas, Inc., Cambridge, MA, 02139, USA
| | - Jaya Padmanabhan
- Takeda Development Center Americas, Inc., Cambridge, MA, 02139, USA
| | - Shang-Fu Chen
- Scripps Research Translational Institute, La Jolla, CA, 92037, USA
- Department of Integrative Structural and Computational Biology, Scripps Research, La Jolla, CA, 92037, USA
| | - Nathan E Wineinger
- Scripps Research Translational Institute, La Jolla, CA, 92037, USA
- Department of Integrative Structural and Computational Biology, Scripps Research, La Jolla, CA, 92037, USA
| | - Raquel Dias
- Scripps Research Translational Institute, La Jolla, CA, 92037, USA
| | - Daria Prilutsky
- Takeda Development Center Americas, Inc., Cambridge, MA, 02139, USA
| | - Sandor Szalma
- Takeda Development Center Americas, Inc., San Diego, CA, 92121, USA
| | - Ali Torkamani
- Scripps Research Translational Institute, La Jolla, CA, 92037, USA.
- Department of Integrative Structural and Computational Biology, Scripps Research, La Jolla, CA, 92037, USA.
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3
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Kosmicki JA, Horowitz JE, Banerjee N, Lanche R, Marcketta A, Maxwell E, Bai X, Sun D, Backman JD, Sharma D, Kury FSP, Kang HM, O'Dushlaine C, Yadav A, Mansfield AJ, Li AH, Watanabe K, Gurski L, McCarthy SE, Locke AE, Khalid S, O'Keeffe S, Mbatchou J, Chazara O, Huang Y, Kvikstad E, O'Neill A, Nioi P, Parker MM, Petrovski S, Runz H, Szustakowski JD, Wang Q, Wong E, Cordova-Palomera A, Smith EN, Szalma S, Zheng X, Esmaeeli S, Davis JW, Lai YP, Chen X, Justice AE, Leader JB, Mirshahi T, Carey DJ, Verma A, Sirugo G, Ritchie MD, Rader DJ, Povysil G, Goldstein DB, Kiryluk K, Pairo-Castineira E, Rawlik K, Pasko D, Walker S, Meynert A, Kousathanas A, Moutsianas L, Tenesa A, Caulfield M, Scott R, Wilson JF, Baillie JK, Butler-Laporte G, Nakanishi T, Lathrop M, Richards JB, Jones M, Balasubramanian S, Salerno W, Shuldiner AR, Marchini J, Overton JD, Habegger L, Cantor MN, Reid JG, Baras A, Abecasis GR, Ferreira MAR. Pan-ancestry exome-wide association analyses of COVID-19 outcomes in 586,157 individuals. Am J Hum Genet 2021; 108:1350-1355. [PMID: 34115965 PMCID: PMC8173480 DOI: 10.1016/j.ajhg.2021.05.017] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 05/24/2021] [Indexed: 01/08/2023] Open
Abstract
Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) causes coronavirus disease 2019 (COVID-19), a respiratory illness that can result in hospitalization or death. We used exome sequence data to investigate associations between rare genetic variants and seven COVID-19 outcomes in 586,157 individuals, including 20,952 with COVID-19. After accounting for multiple testing, we did not identify any clear associations with rare variants either exome wide or when specifically focusing on (1) 13 interferon pathway genes in which rare deleterious variants have been reported in individuals with severe COVID-19, (2) 281 genes located in susceptibility loci identified by the COVID-19 Host Genetics Initiative, or (3) 32 additional genes of immunologic relevance and/or therapeutic potential. Our analyses indicate there are no significant associations with rare protein-coding variants with detectable effect sizes at our current sample sizes. Analyses will be updated as additional data become available, and results are publicly available through the Regeneron Genetics Center COVID-19 Results Browser.
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Affiliation(s)
- Jack A Kosmicki
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Julie E Horowitz
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Nilanjana Banerjee
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Rouel Lanche
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Anthony Marcketta
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Evan Maxwell
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Xiaodong Bai
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Dylan Sun
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Joshua D Backman
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Deepika Sharma
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Fabricio S P Kury
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Hyun M Kang
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Colm O'Dushlaine
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Ashish Yadav
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Adam J Mansfield
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Alexander H Li
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Kyoko Watanabe
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Lauren Gurski
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Shane E McCarthy
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Adam E Locke
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Shareef Khalid
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Sean O'Keeffe
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Joelle Mbatchou
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Olympe Chazara
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | | | - Erika Kvikstad
- Bristol Myers Squibb, Route 206 and Province Line Road, Princeton, NJ 08543, USA
| | - Amanda O'Neill
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - Paul Nioi
- Alnylam Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Meg M Parker
- Alnylam Pharmaceuticals, 675 West Kendall Street, Cambridge, MA 02142, USA
| | - Slavé Petrovski
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - Heiko Runz
- Biogen, 300 Binney Street, Cambridge, MA 02142, USA
| | | | - Quanli Wang
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - Emily Wong
- Takeda California, Inc., 9625 Towne Centre Drive, San Diego, CA 92121, USA
| | | | - Erin N Smith
- Takeda California, Inc., 9625 Towne Centre Drive, San Diego, CA 92121, USA
| | - Sandor Szalma
- Takeda California, Inc., 9625 Towne Centre Drive, San Diego, CA 92121, USA
| | - Xiuwen Zheng
- AbbVie, Inc., 1 N. Waukegan Road, North Chicago, IL 60064, USA
| | - Sahar Esmaeeli
- AbbVie, Inc., 1 N. Waukegan Road, North Chicago, IL 60064, USA
| | - Justin W Davis
- AbbVie, Inc., 1 N. Waukegan Road, North Chicago, IL 60064, USA
| | - Yi-Pin Lai
- Pfizer, Inc., 1 Portland Street, Cambridge, MA 02139, USA
| | - Xing Chen
- Pfizer, Inc., 1 Portland Street, Cambridge, MA 02139, USA
| | | | | | | | | | - Anurag Verma
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Giorgio Sirugo
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Marylyn D Ritchie
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Daniel J Rader
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Gundula Povysil
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - David B Goldstein
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA; Department of Genetics and Development, Columbia University, New York, NY 10032, USA
| | - Krzysztof Kiryluk
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA; Division of Nephrology, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA
| | - Erola Pairo-Castineira
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh EH25 9RG, UK; MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK
| | - Konrad Rawlik
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh EH25 9RG, UK
| | | | | | - Alison Meynert
- MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK
| | | | | | - Albert Tenesa
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh EH25 9RG, UK; MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK; Centre for Global Health Research, Usher Institute of Population Health Sciences and Informatics, Teviot Place, Edinburgh EH8 9AG, UK
| | - Mark Caulfield
- Genomics England, London EC1M 6BQ, UK; William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | - Richard Scott
- Genomics England, London EC1M 6BQ, UK; Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - James F Wilson
- MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK; Centre for Global Health Research, Usher Institute of Population Health Sciences and Informatics, Teviot Place, Edinburgh EH8 9AG, UK
| | - J Kenneth Baillie
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh EH25 9RG, UK; MRC Human Genetics Unit, Institute of Genetics and Cancer, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh EH4 2XU, UK; Intensive Care Unit, Royal Infirmary of Edinburgh, 54 Little France Drive, Edinburgh EH16 5SA, UK
| | - Guillaume Butler-Laporte
- Lady Davis Institute, Jewish General Hospital, Montréal, QC H3T 1E2, Canada; Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montréal, QC H3A 0G4, Canada
| | - Tomoko Nakanishi
- Lady Davis Institute, Jewish General Hospital, Montréal, QC H3T 1E2, Canada; Department of Human Genetics, McGill University, Montréal, QC H3A 0G4, Canada; Kyoto-McGill International Collaborative School in Genomic Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
| | - Mark Lathrop
- Department of Human Genetics, McGill University, Montréal, QC H3A 0G4, Canada; Canadian Centre for Computational Genomics, McGill University, Montréal, QC H3A 0G4, Canada
| | - J Brent Richards
- Lady Davis Institute, Jewish General Hospital, Montréal, QC H3T 1E2, Canada; Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montréal, QC H3A 0G4, Canada; Department of Human Genetics, McGill University, Montréal, QC H3A 0G4, Canada; Department of Twins Research, King's College London, London WC2R 2LS, UK
| | - Marcus Jones
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | | | - William Salerno
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Alan R Shuldiner
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Jonathan Marchini
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - John D Overton
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Lukas Habegger
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Michael N Cantor
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Jeffrey G Reid
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Aris Baras
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA
| | - Goncalo R Abecasis
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA.
| | - Manuel A R Ferreira
- Regeneron Genetics Center, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA.
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4
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Kosmicki JA, Horowitz JE, Banerjee N, Lanche R, Marcketta A, Maxwell E, Bai X, Sun D, Backman JD, Sharma D, Kang HM, O'Dushlaine C, Yadav A, Mansfield AJ, Li AH, Watanabe K, Gurski L, McCarthy SE, Locke AE, Khalid S, O'Keeffe S, Mbatchou J, Chazara O, Huang Y, Kvikstad E, O'Neill A, Nioi P, Parker MM, Petrovski S, Runz H, Szustakowski JD, Wang Q, Wong E, Cordova-Palomera A, Smith EN, Szalma S, Zheng X, Esmaeeli S, Davis JW, Lai YP, Chen X, Justice AE, Leader JB, Mirshahi T, Carey DJ, Verma A, Sirugo G, Ritchie MD, Rader DJ, Povysil G, Goldstein DB, Kiryluk K, Pairo-Castineira E, Rawlik K, Pasko D, Walker S, Meynert A, Kousathanas A, Moutsianas L, Tenesa A, Caulfield M, Scott R, Wilson JF, Baillie JK, Butler-Laporte G, Nakanishi T, Lathrop M, Richards JB, Jones M, Balasubramanian S, Salerno W, Shuldiner AR, Marchini J, Overton JD, Habegger L, Cantor MN, Reid JG, Baras A, Abecasis GR, Ferreira MA. A catalog of associations between rare coding variants and COVID-19 outcomes. medRxiv 2021:2020.10.28.20221804. [PMID: 33655273 PMCID: PMC7924298 DOI: 10.1101/2020.10.28.20221804] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) causes coronavirus disease-19 (COVID-19), a respiratory illness that can result in hospitalization or death. We investigated associations between rare genetic variants and seven COVID-19 outcomes in 543,213 individuals, including 8,248 with COVID-19. After accounting for multiple testing, we did not identify any clear associations with rare variants either exome-wide or when specifically focusing on (i) 14 interferon pathway genes in which rare deleterious variants have been reported in severe COVID-19 patients; (ii) 167 genes located in COVID-19 GWAS risk loci; or (iii) 32 additional genes of immunologic relevance and/or therapeutic potential. Our analyses indicate there are no significant associations with rare protein-coding variants with detectable effect sizes at our current sample sizes. Analyses will be updated as additional data become available, with results publicly browsable at https://rgc-covid19.regeneron.com.
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Affiliation(s)
- J A Kosmicki
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - J E Horowitz
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - N Banerjee
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - R Lanche
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A Marcketta
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - E Maxwell
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - X Bai
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - D Sun
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - J D Backman
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - D Sharma
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - H M Kang
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - C O'Dushlaine
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A Yadav
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A J Mansfield
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A H Li
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - K Watanabe
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - L Gurski
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - S E McCarthy
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A E Locke
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - S Khalid
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - S O'Keeffe
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - J Mbatchou
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - O Chazara
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - Y Huang
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - E Kvikstad
- Bristol Myers Squibb, Route 206 and Province Line Road, Princeton, NJ 08543, USA
| | - A O'Neill
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - P Nioi
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - M M Parker
- Alnylam Pharmaceuticals, 675 West Kendall St, Cambridge, MA 02142, USA
| | - S Petrovski
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - H Runz
- Biogen, 300 Binney St, Cambridge, MA 02142, USA
| | - J D Szustakowski
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - Q Wang
- Centre for Genomics Research, Discovery Sciences, BioPharmaceuticals R&D, AstraZeneca, Cambridge CB2 0AA, UK
| | - E Wong
- Biogen, 300 Binney St, Cambridge, MA 02142, USA
| | | | - E N Smith
- Takeda California Inc., 9625 Towne Centre Dr, San Diego, CA 92121, USA
| | - S Szalma
- Takeda California Inc., 9625 Towne Centre Dr, San Diego, CA 92121, USA
| | - X Zheng
- AbbVie, Inc., 1 N. Waukegan Rd, North Chicago, IL 60064, USA
| | - S Esmaeeli
- AbbVie, Inc., 1 N. Waukegan Rd, North Chicago, IL 60064, USA
| | - J W Davis
- AbbVie, Inc., 1 N. Waukegan Rd, North Chicago, IL 60064, USA
| | - Y-P Lai
- Pfizer, Inc., 1 Portland Street, Cambridge MA 02139, USA
| | - X Chen
- Pfizer, Inc., 1 Portland Street, Cambridge MA 02139, USA
| | | | | | | | | | - A Verma
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - G Sirugo
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - M D Ritchie
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - D J Rader
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - G Povysil
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
| | - D B Goldstein
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
- Department of Genetics & Development, Columbia University, New York, NY 10032, USA
| | - K Kiryluk
- Institute for Genomic Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA
- Division of Nephrology, Department of Medicine, Vagelos College of Physicians & Surgeons, Columbia University, New York, NY 10032, USA
| | - E Pairo-Castineira
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh, EH25 9RG, UK
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
| | - K Rawlik
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh, EH25 9RG, UK
| | - D Pasko
- Genomics England, London EC1M 6BQ, UK
| | - S Walker
- Genomics England, London EC1M 6BQ, UK
| | - A Meynert
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
| | | | | | - A Tenesa
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh, EH25 9RG, UK
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
- Centre for Global Health Research, Usher Institute of Population Health Sciences and Informatics, Teviot Place, Edinburgh EH8 9AG, UK
| | - M Caulfield
- Genomics England, London EC1M 6BQ, UK
- William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London EC1M 6BQ, UK
| | - R Scott
- Genomics England, London EC1M 6BQ, UK
- Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - J F Wilson
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
- Centre for Global Health Research, Usher Institute of Population Health Sciences and Informatics, Teviot Place, Edinburgh EH8 9AG, UK
| | - J K Baillie
- Roslin Institute, University of Edinburgh, Easter Bush, Edinburgh, EH25 9RG, UK
- MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine, University of Edinburgh, Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, UK
- Intensive Care Unit, Royal Infirmary of Edinburgh, 54 Little France Drive, Edinburgh, EH16 5SA, UK
| | - G Butler-Laporte
- Lady Davis Institute, Jewish General Hospital, Montréal, Québec H3T 1E2, Canada
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montréal, Québec H3A 0G4, Canada
| | - T Nakanishi
- Lady Davis Institute, Jewish General Hospital, Montréal, Québec H3T 1E2, Canada
- Department of Human Genetics, McGill University, Montréal, Québec H3A 0G4, Canada
- Kyoto-McGill International Collaborative School in Genomic Medicine, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
- Research Fellow, Japan Society for the Promotion of Science
| | - M Lathrop
- Department of Human Genetics, McGill University, Montréal, Québec H3A 0G4, Canada
- Canadian Centre for Computational Genomics, McGill University, Montréal, Québec H3A 0G4, Canada
| | - J B Richards
- Lady Davis Institute, Jewish General Hospital, Montréal, Québec H3T 1E2, Canada
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montréal, Québec H3A 0G4, Canada
- Department of Human Genetics, McGill University, Montréal, Québec H3A 0G4, Canada
- Department of Twins Research, King's College London, London WC2R 2LS, UK
| | - M Jones
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - S Balasubramanian
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - W Salerno
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A R Shuldiner
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - J Marchini
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - J D Overton
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - L Habegger
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - M N Cantor
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - J G Reid
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - A Baras
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - G R Abecasis
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
| | - M A Ferreira
- Regeneron Genetics Center, 777 Old Saw Mill River Rd., Tarrytown, NY 10591, USA
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Pratt D, Chen J, Welker D, Rivas R, Pillich R, Rynkov V, Ono K, Miello C, Hicks L, Szalma S, Stojmirovic A, Dobrin R, Braxenthaler M, Kuentzer J, Demchak B, Ideker T. NDEx, the Network Data Exchange. Cell Syst 2015; 1:302-305. [PMID: 26594663 DOI: 10.1016/j.cels.2015.10.001] [Citation(s) in RCA: 154] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Networks are a powerful and flexible methodology for expressing biological knowledge for computation and communication. Network-encoded information can include systematic screens for molecular interactions, biological relationships curated from literature, and outputs from analysis of Big Data. NDEx, the Network Data Exchange (www.ndexbio.org), is an online commons where scientists can upload, share, and publicly distribute networks. Networks in NDEx receive globally unique accession IDs and can be stored for private use, shared in pre-publication collaboration, or released for public access. Standard and novel data formats are accommodated in a flexible storage model. Organizations can use NDEx as a distribution channel for networks they generate or curate. Developers of bioinformatic applications can store and query NDEx networks via a common programmatic interface. NDEx helps expand the role of networks in scientific discourse and facilitates the integration of networks as data in publications. It is a step towards an ecosystem in which networks bearing data, hypotheses, and findings flow easily between scientists.
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Affiliation(s)
- Dexter Pratt
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Jing Chen
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - David Welker
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Ricardo Rivas
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Rudolf Pillich
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Vladimir Rynkov
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Keiichiro Ono
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Carol Miello
- Pfizer Inc., Eastern Point Road, Groton, CT 06340, USA
| | | | - Sandor Szalma
- Janssen Research and Development LLC, 3210 Merryfield Row, San Diego, CA 92121, USA
| | | | - Radu Dobrin
- Janssen Research and Development LLC, 1400 McKean Road, Spring House, PA 19477, USA
| | - Michael Braxenthaler
- Roche, Pharma Research and Early Development Informatics (pREDi), Roche Innovation Center New York, New York, 10016, USA
| | - Jan Kuentzer
- Roche, Pharma Research and Early Development Informatics (pREDi), Roche Innovation Center Penzberg, Penzberg, 82377, Germany
| | - Barry Demchak
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Trey Ideker
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA ; Department of Computer Science and Engineering, University of California San Diego, La Jolla, CA 92093, USA
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Seiler M, Huang CC, Szalma S, Bhanot G. ConsensusCluster: a software tool for unsupervised cluster discovery in numerical data. OMICS 2010; 14:109-13. [PMID: 20141333 DOI: 10.1089/omi.2009.0083] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We have created a stand-alone software tool, ConsensusCluster, for the analysis of high-dimensional single nucleotide polymorphism (SNP) and gene expression microarray data. Our software implements the consensus clustering algorithm and principal component analysis to stratify the data into a given number of robust clusters. The robustness is achieved by combining clustering results from data and sample resampling as well as by averaging over various algorithms and parameter settings to achieve accurate, stable clustering results. We have implemented several different clustering algorithms in the software, including K-Means, Partition Around Medoids, Self-Organizing Map, and Hierarchical clustering methods. After clustering the data, ConsensusCluster generates a consensus matrix heatmap to give a useful visual representation of cluster membership, and automatically generates a log of selected features that distinguish each pair of clusters. ConsensusCluster gives more robust and more reliable clusters than common software packages and, therefore, is a powerful unsupervised learning tool that finds hidden patterns in data that might shed light on its biological interpretation. This software is free and available from http://code.google.com/p/consensus-cluster .
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Affiliation(s)
- Michael Seiler
- BioMaPS Institute, Rutgers University, Piscataway, New Jersey 08854, USA
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7
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Perakslis ED, Van Dam J, Szalma S. How Informatics Can Potentiate Precompetitive Open-Source Collaboration to Jump-Start Drug Discovery and Development. Clin Pharmacol Ther 2010; 87:614-6. [DOI: 10.1038/clpt.2010.21] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Reddy A, Huang CC, Liu H, Delisi C, Nevalainen MT, Szalma S, Bhanot G. Robust gene network analysis reveals alteration of the STAT5a network as a hallmark of prostate cancer. Genome Inform 2010; 24:139-153. [PMID: 22081596 PMCID: PMC6035043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We develop a general method to identify gene networks from pair-wise correlations between genes in a microarray data set and apply it to a public prostate cancer gene expression data from 69 primary prostate tumors. We define the degree of a node as the number of genes significantly associated with the node and identify hub genes as those with the highest degree. The correlation network was pruned using transcription factor binding information in VisANT (http://visant.bu.edu/) as a biological filter. The reliability of hub genes was determined using a strict permutation test. Separate networks for normal prostate samples, and prostate cancer samples from African Americans (AA) and European Americans (EA) were generated and compared. We found that the same hubs control disease progression in AA and EA networks. Combining AA and EA samples, we generated networks for low low (<7) and high (≥7) Gleason grade tumors. A comparison of their major hubs with those of the network for normal samples identified two types of changes associated with disease: (i) Some hub genes increased their degree in the tumor network compared to their degree in the normal network, suggesting that these genes are associated with gain of regulatory control in cancer (e.g. possible turning on of oncogenes). (ii) Some hubs reduced their degree in the tumor network compared to their degree in the normal network, suggesting that these genes are associated with loss of regulatory control in cancer (e.g. possible loss of tumor suppressor genes). A striking result was that for both AA and EA tumor samples, STAT5a, CEBPB and EGR1 are major hubs that gain neighbors compared to the normal prostate network. Conversely, HIF-lα is a major hub that loses connections in the prostate cancer network compared to the normal prostate network. We also find that the degree of these hubs changes progressively from normal to low grade to high grade disease, suggesting that these hubs are master regulators of prostate cancer and marks disease progression. STAT5a was identified as a central hub, with ~120 neighbors in the prostate cancer network and only 81 neighbors in the normal prostate network. Of the 120 neighbors of STAT5a, 57 are known cancer related genes, known to be involved in functional pathways associated with tumorigenesis. Our method is general and can easily be extended to identify and study networks associated with any two phenotypes.
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Affiliation(s)
- Anupama Reddy
- BioMaPS Institute, Rutgers University, Piscataway, NJ, USA.
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Racz P, Mink M, Ordas A, Cao T, Szalma S, Szauter KM, Csiszar K. The human orthologue of murine Mpzl3 with predicted adhesive and immune functions is a potential candidate gene for immune-related hereditary hair loss. Exp Dermatol 2008; 18:261-3. [PMID: 19054061 DOI: 10.1111/j.1600-0625.2008.00797.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have recently reported a mutation within the conserved immunoglobulin V-type domain of the predicted adhesion protein Mpzl3 (MIM 611707) in rough coat (rc) mice with severe skin abnormalities and progressive cyclic hair loss. In this study, we tested the hypothesis that the human orthologue MPZL3 on chromosome 11q23.3 is a candidate for similar symptoms in humans. The predicted conserved MPZL3 protein has two transmembrane motifs flanking an extracellular Ig-like domain. The R100Q rc mutation is within the Ig-domain recognition loop that has roles in T-cell receptors and cell adhesion. Results of the rc mouse study, 3D structure predictions, homology with Myelin Protein Zero and EVA1, comprehensive database analyses of polymorphisms and mutations within the human MPZL3 gene and its cell, tissue expression and immunostaining pattern indicate that homozygous or compound heterozygous mutations of MPZL3 might be involved in immune-mediated human hereditary disorders with hair loss.
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Rexroth A, Schmidt P, Szalma S, Geppert T, Schwalbe H, Griesinger C. New principle for the determination of coupling constants that largely suppresses differential relaxation effects. J Am Chem Soc 2002. [DOI: 10.1021/ja00146a027] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Badger J, Kumar RA, Yip P, Szalma S. New features and enhancements in the X-PLOR computer program. Proteins 1999; 35:25-33. [PMID: 10090283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
This article describes new methods for X-ray crystallographic refinement and nuclear magnetic resonance (NMR) structure determination that are available in the recent release of the X-PLOR software, X-PLOR 98.0. The major new features of the X-PLOR 98.0 software are: (i) the introduction of maximum likelihood methods (Pannu and Read, Acta Crystallogr 1996;A52:659-668) for X-ray crystallographic refinement with structure factor amplitude, intensity and phase probability targets, (ii) the addition of the Andersen thermal coupling method for temperature control during simulated annealing refinements, (iii) a new utility function for converting reflection data in to the X-PLOR format, (iv) validated scripts and performance enhancements for structure determination from NMR distance restraints using torsion angle dynamics, (v) fast code for direct nuclear Oberhauser effect (NOE) refinement using matrix doubling and gaussian quadratures, (vi) methodologies for using ambiguous restraint information to perform automated iterative peak assignment and structure determination (Nilges et al., J Mol Biol 1997;269: 408-422). Additional developments in methodology for refining crystal structures from poor initial models include the implementation of a fast adaptive bulk solvent scattering correction and an energy minimization routine that makes use of second derivative information. Trial crystallographic refinements with an energy minimization protocol that includes these enhancements indicate significantly improved convergence. The quality of the resulting models appears comparable to models obtained from refinement protocols that incorporate torsion angle dynamics. Test applications of the new energy minimizer to NMR structure refinement with using NOE calculations also show improved convergence, leading to more optimized final models.
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Affiliation(s)
- J Badger
- Molecular Simulations Inc., San Diego, California, USA.
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13
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Rexroth A, Szalma S, Weisemann R, Bermel W, Schwalbe H, Griesinger C. Determination of (3)J(H (infi) (supN) ,C (infi) (sup') ) coupling constants in proteins with the C'-FIDS method. J Biomol NMR 1995; 6:237-244. [PMID: 22910848 DOI: 10.1007/bf00197805] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/1995] [Accepted: 07/27/1995] [Indexed: 06/01/2023]
Abstract
We introduce the C'-FIDS-(1)H,(15)N-HSQC experiment, a new method for the determination of (3)J(H (infi) (supN) ,C (infi) (sup') ) coupling constants in proteins, yielding information about the torsional angle ϕ. It relies on the (1)H,(15)N-HSQC or HNCO experiment, two of the the most sensitive heteronuclear correlation experiments for isotopically labeled proteins. A set of three (1)H,(15)N-HSQC or HNCO spectra are recorded: a reference experiment in which the carbonyl spins are decoupled during t(1) and t(2), a second experiment in which they are decoupled exclusively during t(1) and a third one in which they are coupled in t(1) as well as t(2). The last experiment yields an E.COSY-type pattern from which the (2)J(H (infi) (supN) ,C (infi-1) (sup') ) and (1)J(N(i),C (infi-1) (sup') ) coupling constants can be extracted. By comparison of the coupled multiplet (obtained from the second experiment) with the decoupled multiplet (obtained from the first experiment) convoluted with the (2)J(H (infi) (supN) ,C (infi-1) (sup') ) coupling, the (3)J(H (infi) (supN) ,C (infi) (sup') ) coupling can be found in a one-parameter fitting procedure. The method is demonstrated for the protein rhodniin, containing 103 amino acids. Systematic errors due to differential relaxation are small for (n)J(H(N),C') couplings in biomacromolecules of the size currently under NMR spectroscopic investigation.
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Affiliation(s)
- A Rexroth
- Institut für Organische Chemie, Universität Frankfurt, Marie Curie Strasse 11, D-60439, Frankfurt, Germany
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Szalma S, Pelczer I. 5164670 Multidimensional magnetic resonance system using selective discrete fourier transformation (SDFT). Magn Reson Imaging 1993. [DOI: 10.1016/0730-725x(93)90279-m] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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