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Deckert A, Anders S, Morales I, De Allegri M, Nguyen HT, Souares A, McMahon S, Meurer M, Burk R, Lou D, Brugnara L, Sand M, Koeppel L, Maier-Hein L, Ross T, Adler TJ, Brenner S, Dyer C, Herbst K, Ovchinnikova S, Marx M, Schnitzler P, Knop M, Bärnighausen T, Denkinger CM. Correction: Comparison of Four Active SARS-CoV-2 Surveillance Strategies in Representative Population Sample Points: Two-Factor Factorial Randomized Controlled Trial. JMIR Public Health Surveill 2024; 10:e57203. [PMID: 38364221 PMCID: PMC10907930 DOI: 10.2196/57203] [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: 02/07/2024] [Accepted: 02/07/2024] [Indexed: 02/18/2024] Open
Abstract
[This corrects the article DOI: 10.2196/44204.].
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Affiliation(s)
| | - Simon Anders
- Center for Molecular Biology HeidelbergHeidelbergGermany
| | - Ivonne Morales
- Division of Infectious Disease and Tropical Medicine, Heidelberg University HospitalHeidelbergGermany
| | | | | | | | | | | | - Robin Burk
- Center for Molecular Biology HeidelbergHeidelbergGermany
| | - Dan Lou
- Center for Molecular Biology HeidelbergHeidelbergGermany
| | - Lucia Brugnara
- evaplan GmbH at the University HospitalHeidelbergGermany
| | - Matthias Sand
- GESIS Leibniz-Institute for the Social SciencesMannheimGermany
| | - Lisa Koeppel
- Division of Infectious Disease and Tropical Medicine, Heidelberg University HospitalHeidelbergGermany
| | - Lena Maier-Hein
- Division of Computer Assisted Medical Interventions, German Cancer Research CentreHeidelbergGermany
| | - Tobias Ross
- Division of Computer Assisted Medical Interventions, German Cancer Research CentreHeidelbergGermany
| | - Tim J Adler
- Division of Computer Assisted Medical Interventions, German Cancer Research CentreHeidelbergGermany
| | | | | | - Konrad Herbst
- Center for Molecular Biology HeidelbergHeidelbergGermany
| | | | - Michael Marx
- evaplan GmbH at the University HospitalHeidelbergGermany
| | - Paul Schnitzler
- Center of Infectious Diseases, Virology, Heidelberg University HospitalHeidelbergGermany
| | - Michael Knop
- Center for Molecular Biology HeidelbergHeidelbergGermany
| | | | - Claudia M Denkinger
- Division of Infectious Disease and Tropical Medicine, Heidelberg University HospitalHeidelbergGermany
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Kritsiligkou P, Bosch K, Shen TK, Meurer M, Knop M, Dick TP. Proteome-wide tagging with an H 2O 2 biosensor reveals highly localized and dynamic redox microenvironments. Proc Natl Acad Sci U S A 2023; 120:e2314043120. [PMID: 37991942 PMCID: PMC10691247 DOI: 10.1073/pnas.2314043120] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 09/20/2023] [Indexed: 11/24/2023] Open
Abstract
Hydrogen peroxide (H2O2) sensing and signaling involves the reversible oxidation of particular thiols on particular proteins to modulate protein function in a dynamic manner. H2O2 can be generated from various intracellular sources, but their identities and relative contributions are often unknown. To identify endogenous "hotspots" of H2O2 generation on the scale of individual proteins and protein complexes, we generated a yeast library in which the H2O2 sensor HyPer7 was fused to the C-terminus of all protein-coding open reading frames (ORFs). We also generated a control library in which a redox-insensitive mutant of HyPer7 (SypHer7) was fused to all ORFs. Both libraries were screened side-by-side to identify proteins located within H2O2-generating environments. Screening under a variety of different metabolic conditions revealed dynamic changes in H2O2 availability highly specific to individual proteins and protein complexes. These findings suggest that intracellular H2O2 generation is much more localized and functionally differentiated than previously recognized.
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Affiliation(s)
- Paraskevi Kritsiligkou
- Division of Redox Regulation, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance69120Heidelberg, Germany
| | - Katharina Bosch
- Division of Redox Regulation, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance69120Heidelberg, Germany
- Faculty of Biosciences, Heidelberg University, 69120Heidelberg, Germany
| | - Tzu Keng Shen
- Division of Redox Regulation, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance69120Heidelberg, Germany
- Faculty of Biosciences, Heidelberg University, 69120Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, 69120Heidelberg, Germany
- Research Group Cell Morphogenesis and Signal Transduction, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, 69120Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, 69120Heidelberg, Germany
- Research Group Cell Morphogenesis and Signal Transduction, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, 69120Heidelberg, Germany
| | - Tobias P. Dick
- Division of Redox Regulation, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance69120Heidelberg, Germany
- Faculty of Biosciences, Heidelberg University, 69120Heidelberg, Germany
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3
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Deckert A, Anders S, Morales I, De Allegri M, Nguyen HT, Souares A, McMahon S, Meurer M, Burk R, Lou D, Brugnara L, Sand M, Koeppel L, Maier-Hein L, Ross T, Adler TJ, Brenner S, Dyer C, Herbst K, Ovchinnikova S, Marx M, Schnitzler P, Knop M, Bärnighausen T, Denkinger CM. Comparison of Four Active SARS-CoV-2 Surveillance Strategies in Representative Population Sample Points: Two-Factor Factorial Randomized Controlled Trial. JMIR Public Health Surveill 2023; 9:e44204. [PMID: 37235704 PMCID: PMC10437130 DOI: 10.2196/44204] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 03/30/2023] [Accepted: 05/24/2023] [Indexed: 05/28/2023] Open
Abstract
BACKGROUND The COVID-19 pandemic is characterized by rapid increases in infection burden owing to the emergence of new variants with higher transmissibility and immune escape. To date, monitoring the COVID-19 pandemic has mainly relied on passive surveillance, yielding biased epidemiological measures owing to the disproportionate number of undetected asymptomatic cases. Active surveillance could provide accurate estimates of the true prevalence to forecast the evolution of the pandemic, enabling evidence-based decision-making. OBJECTIVE This study compared 4 different approaches of active SARS-CoV-2 surveillance focusing on feasibility and epidemiological outcomes. METHODS A 2-factor factorial randomized controlled trial was conducted in 2020 in a German district with 700,000 inhabitants. The epidemiological outcome comprised SARS-CoV-2 prevalence and its precision. The 4 study arms combined 2 factors: individuals versus households and direct testing versus testing conditioned on symptom prescreening. Individuals aged ≥7 years were eligible. Altogether, 27,908 addresses from 51 municipalities were randomly allocated to the arms and 15 consecutive recruitment weekdays. Data collection and logistics were highly digitized, and a website in 5 languages enabled low-barrier registration and tracking of results. Gargle sample collection kits were sent by post. Participants collected a gargle sample at home and mailed it to the laboratory. Samples were analyzed with reverse transcription loop-mediated isothermal amplification (RT-LAMP); positive and weak results were confirmed with real-time reverse transcription-polymerase chain reaction (RT-PCR). RESULTS Recruitment was conducted between November 18 and December 11, 2020. The response rates in the 4 arms varied between 34.31% (2340/6821) and 41.17% (2043/4962). The prescreening classified 16.61% (1207/7266) of the patients as COVID-19 symptomatic. Altogether, 4232 persons without prescreening and 7623 participating in the prescreening provided 5351 gargle samples, of which 5319 (99.4%) could be analyzed. This yielded 17 confirmed SARS-CoV-2 infections and a combined prevalence of 0.36% (95% CI 0.14%-0.59%) in the arms without prescreening and 0.05% (95% CI 0.00%-0.108%) in the arms with prescreening (initial contacts only). Specifically, we found a prevalence of 0.31% (95% CI 0.06%-0.58%) for individuals and 0.35% (95% CI 0.09%-0.61%) for households, and lower estimates with prescreening (0.07%, 95% CI 0.0%-0.15% for individuals and 0.02%, 95% CI 0.0%-0.06% for households). Asymptomatic infections occurred in 27% (3/11) of the positive cases with symptom data. The 2 arms without prescreening performed the best regarding effectiveness and accuracy. CONCLUSIONS This study showed that postal mailing of gargle sample kits and returning home-based self-collected liquid gargle samples followed by high-sensitivity RT-LAMP analysis is a feasible way to conduct active SARS-CoV-2 population surveillance without burdening routine diagnostic testing. Efforts to improve participation rates and integration into the public health system may increase the potential to monitor the course of the pandemic. TRIAL REGISTRATION Deutsches Register Klinischer Studien (DRKS) DRKS00023271; https://tinyurl.com/3xenz68a. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID) RR2-10.1186/s13063-021-05619-5.
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Affiliation(s)
| | - Simon Anders
- Center for Molecular Biology Heidelberg, Heidelberg, Germany
| | - Ivonne Morales
- Division of Infectious Disease and Tropical Medicine, Heidelberg University Hospital, Heidelberg, Germany
| | | | - Hoa Thi Nguyen
- Heidelberg Institute of Global Health, Heidelberg, Germany
| | | | | | - Matthias Meurer
- Center for Molecular Biology Heidelberg, Heidelberg, Germany
| | - Robin Burk
- Center for Molecular Biology Heidelberg, Heidelberg, Germany
| | - Dan Lou
- Center for Molecular Biology Heidelberg, Heidelberg, Germany
| | - Lucia Brugnara
- evaplan GmbH at the University Hospital, Heidelberg, Germany
| | - Matthias Sand
- GESIS Leibniz-Institute for the Social Sciences, Mannheim, Germany
| | - Lisa Koeppel
- Division of Infectious Disease and Tropical Medicine, Heidelberg University Hospital, Heidelberg, Germany
| | - Lena Maier-Hein
- Division of Computer Assisted Medical Interventions, German Cancer Research Centre, Heidelberg, Germany
| | - Tobias Ross
- Division of Computer Assisted Medical Interventions, German Cancer Research Centre, Heidelberg, Germany
| | - Tim J Adler
- Division of Computer Assisted Medical Interventions, German Cancer Research Centre, Heidelberg, Germany
| | | | | | - Konrad Herbst
- Center for Molecular Biology Heidelberg, Heidelberg, Germany
| | | | - Michael Marx
- evaplan GmbH at the University Hospital, Heidelberg, Germany
| | - Paul Schnitzler
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology Heidelberg, Heidelberg, Germany
| | | | - Claudia M Denkinger
- Division of Infectious Disease and Tropical Medicine, Heidelberg University Hospital, Heidelberg, Germany
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Lou D, Meurer M, Ovchinnikova S, Burk R, Denzler A, Herbst K, Papaioannou IA, Duan Y, Jacobs ML, Witte V, Ürge D, Kirrmaier D, Krogemann M, Gubicza K, Boerner K, Bundschuh C, Weidner NM, Merle U, Knorr B, Welker A, Denkinger CM, Schnitzler P, Kräusslich HG, Dao Thi VL, De Allegri M, Nguyen HT, Deckert A, Anders S, Knop M. Scalable RT-LAMP-based SARS-CoV-2 testing for infection surveillance with applications in pandemic preparedness. EMBO Rep 2023; 24:e57162. [PMID: 36951170 PMCID: PMC10157315 DOI: 10.15252/embr.202357162] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 03/10/2023] [Indexed: 03/24/2023] Open
Abstract
Throughout the SARS-CoV-2 pandemic, limited diagnostic capacities prevented sentinel testing, demonstrating the need for novel testing infrastructures. Here, we describe the setup of a cost-effective platform that can be employed in a high-throughput manner, which allows surveillance testing as an acute pandemic control and preparedness tool, exemplified by SARS-CoV-2 diagnostics in an academic environment. The strategy involves self-sampling based on gargling saline, pseudonymized sample handling, automated RNA extraction, and viral RNA detection using a semiquantitative multiplexed colorimetric reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay with an analytical sensitivity comparable with RT-qPCR. We provide standard operating procedures and an integrated software solution for all workflows, including sample logistics, analysis by colorimetry or sequencing, and communication of results. We evaluated factors affecting the viral load and the stability of gargling samples as well as the diagnostic sensitivity of the RT-LAMP assay. In parallel, we estimated the economic costs of setting up and running the test station. We performed > 35,000 tests, with an average turnover time of < 6 h from sample arrival to result announcement. Altogether, our work provides a blueprint for fast, sensitive, scalable, cost- and labor-efficient RT-LAMP diagnostics, which is independent of potentially limiting clinical diagnostics supply chains.
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Affiliation(s)
- Dan Lou
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Svetlana Ovchinnikova
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- Bioquant Center, Heidelberg University, Heidelberg, Germany
| | - Robin Burk
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Anna Denzler
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Konrad Herbst
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | | | - Yuanqiang Duan
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Max L Jacobs
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Victoria Witte
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Daniel Ürge
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Daniel Kirrmaier
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Michelle Krogemann
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Krisztina Gubicza
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Kathleen Boerner
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Christian Bundschuh
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Niklas M Weidner
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Uta Merle
- Department of Gastroenterology, Heidelberg University Hospital, Heidelberg, Germany
| | - Britta Knorr
- Landratsamt Rhein-Neckar-Kreis, Gesundheitsamt, Heidelberg, Germany
| | - Andreas Welker
- Landratsamt Rhein-Neckar-Kreis, Gesundheitsamt, Heidelberg, Germany
| | - Claudia M Denkinger
- Division of Infectious Disease and Tropical Medicine, Heidelberg University Hospital, Heidelberg, Germany
- German Center for Infection Research (DZIF), Heidelberg, Germany
| | - Paul Schnitzler
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Hans-Georg Kräusslich
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- German Center for Infection Research (DZIF), Heidelberg, Germany
| | - Viet Loan Dao Thi
- German Center for Infection Research (DZIF), Heidelberg, Germany
- Schaller Research Groups, Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Manuela De Allegri
- Heidelberg Institute of Global Health, University Hospital and Medical Faculty, Heidelberg University, Heidelberg, Germany
| | - Hoa Thi Nguyen
- Heidelberg Institute of Global Health, University Hospital and Medical Faculty, Heidelberg University, Heidelberg, Germany
| | - Andreas Deckert
- Heidelberg Institute of Global Health, University Hospital and Medical Faculty, Heidelberg University, Heidelberg, Germany
| | - Simon Anders
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- Bioquant Center, Heidelberg University, Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
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5
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Deckert A, Anders S, De Allegri M, Nguyen HT, Souares A, McMahon S, Meurer M, Burk R, Sand M, Koeppel L, Hein LM, Roß T, Adler T, Siems T, Brugnara L, Brenner S, Herbst K, Kirrmaier D, Duan Y, Ovchinnikova S, Boerner K, Marx M, Kräusslich HG, Knop M, Bärnighausen T, Denkinger C. Effectiveness and cost-effectiveness of four different strategies for SARS-CoV-2 surveillance in the general population (CoV-Surv Study): study protocol for a two-factorial randomized controlled multi-arm trial with cluster sampling. Trials 2021; 22:656. [PMID: 34565421 PMCID: PMC8474710 DOI: 10.1186/s13063-021-05619-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 09/13/2021] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND To achieve higher effectiveness in population-based SARS-CoV-2 surveillance and to reliably predict the course of an outbreak, screening, and monitoring of infected individuals without major symptoms (about 40% of the population) will be necessary. While current testing capacities are also used to identify such asymptomatic cases, this rather passive approach is not suitable in generating reliable population-based estimates of the prevalence of asymptomatic carriers to allow any dependable predictions on the course of the pandemic. METHODS This trial implements a two-factorial, randomized, controlled, multi-arm, prospective, interventional, single-blinded design with cluster sampling and four study arms, each representing a different SARS-CoV-2 testing and surveillance strategy based on individuals' self-collection of saliva samples which are then sent to and analyzed by a laboratory. The targeted sample size for the trial is 10,000 saliva samples equally allocated to the four study arms (2500 participants per arm). Strategies differ with respect to tested population groups (individuals vs. all household members) and testing approach (without vs. with pre-screening survey). The trial is complemented by an economic evaluation and qualitative assessment of user experiences. Primary outcomes include costs per completely screened person, costs per positive case, positive detection rate, and precision of positive detection rate. DISCUSSION Systems for active surveillance of the general population will gain more importance in the context of pandemics and related disease prevention efforts. The pandemic parameters derived from such active surveillance with routine population monitoring therefore not only enable a prospective assessment of the short-term course of a pandemic, but also a more targeted and thus more effective use of local and short-term countermeasures. TRIAL REGISTRATION ClinicalTrials.gov DRKS00023271 . Registered November 30, 2020, with the German Clinical Trials Register (Deutsches Register Klinischer Studien).
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Affiliation(s)
- Andreas Deckert
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Simon Anders
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Manuela De Allegri
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Hoa Thi Nguyen
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Aurélia Souares
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Shannon McMahon
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Robin Burk
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Matthias Sand
- GESIS Leibniz-Institute for the Social Sciences, B2/1, 68159 Mannheim, Germany
| | - Lisa Koeppel
- Division of Clinical Tropical Medicine, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Lena Maier Hein
- Division of Computer Assisted Medical Interventions (CAMI), German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 223, 69120 Heidelberg, Germany
| | - Tobias Roß
- Division of Computer Assisted Medical Interventions (CAMI), German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 223, 69120 Heidelberg, Germany
| | - Tim Adler
- Division of Computer Assisted Medical Interventions (CAMI), German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 223, 69120 Heidelberg, Germany
| | - Tobias Siems
- Institute for Applied Mathematics, University of Heidelberg, Berliner Str. 41-49, 69120 Heidelberg, Germany
| | - Lucia Brugnara
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
- evaplan GmbH at the University Hospital, Ringstr.19b, 69115 Heidelberg, Germany
| | - Stephan Brenner
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Konrad Herbst
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Daniel Kirrmaier
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Yuanqiang Duan
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Svetlana Ovchinnikova
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Kathleen Boerner
- Department of Infectious Diseases, Virology, University of Heidelberg, Im Neuenheimer Feld 267, 69120 Heidelberg, Germany
| | - Michael Marx
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
- evaplan GmbH at the University Hospital, Ringstr.19b, 69115 Heidelberg, Germany
| | - Hans-Georg Kräusslich
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Till Bärnighausen
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
| | - Claudia Denkinger
- Division of Clinical Tropical Medicine, University of Heidelberg, Im Neuenheimer Feld 324, 69120 Heidelberg, Germany
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Kong KYE, Fischer B, Meurer M, Kats I, Li Z, Rühle F, Barry JD, Kirrmaier D, Chevyreva V, San Luis BJ, Costanzo M, Huber W, Andrews BJ, Boone C, Knop M, Khmelinskii A. Timer-based proteomic profiling of the ubiquitin-proteasome system reveals a substrate receptor of the GID ubiquitin ligase. Mol Cell 2021; 81:2460-2476.e11. [PMID: 33974913 PMCID: PMC8189435 DOI: 10.1016/j.molcel.2021.04.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 03/15/2021] [Accepted: 04/19/2021] [Indexed: 01/01/2023]
Abstract
Selective protein degradation by the ubiquitin-proteasome system (UPS) is involved in all cellular processes. However, the substrates and specificity of most UPS components are not well understood. Here we systematically characterized the UPS in Saccharomyces cerevisiae. Using fluorescent timers, we determined how loss of individual UPS components affects yeast proteome turnover, detecting phenotypes for 76% of E2, E3, and deubiquitinating enzymes. We exploit this dataset to gain insights into N-degron pathways, which target proteins carrying N-terminal degradation signals. We implicate Ubr1, an E3 of the Arg/N-degron pathway, in targeting mitochondrial proteins processed by the mitochondrial inner membrane protease. Moreover, we identify Ylr149c/Gid11 as a substrate receptor of the glucose-induced degradation-deficient (GID) complex, an E3 of the Pro/N-degron pathway. Our results suggest that Gid11 recognizes proteins with N-terminal threonines, expanding the specificity of the GID complex. This resource of potential substrates and relationships between UPS components enables exploring functions of selective protein degradation.
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Affiliation(s)
| | - Bernd Fischer
- Computational Genome Biology, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Ilia Kats
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Zhaoyan Li
- Institute of Molecular Biology (IMB), Mainz, Germany
| | - Frank Rühle
- Institute of Molecular Biology (IMB), Mainz, Germany
| | - Joseph D Barry
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Daniel Kirrmaier
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany; Cell Morphogenesis and Signal Transduction, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Veronika Chevyreva
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Bryan-Joseph San Luis
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michael Costanzo
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Wolfgang Huber
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Brenda J Andrews
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Charles Boone
- The Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON, Canada; Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany; Cell Morphogenesis and Signal Transduction, German Cancer Research Center (DKFZ), DKFZ-ZMBH Alliance, Heidelberg, Germany.
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7
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Herbst K, Meurer M, Kirrmaier D, Anders S, Knop M, Thi VLD. Colorimetric RT-LAMP and LAMP-sequencing forDetecting SARS-CoV-2 RNA in Clinical Samples. Bio Protoc 2021; 11:e3964. [PMID: 33855122 DOI: 10.21769/bioprotoc.3964] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 09/01/2020] [Revised: 01/13/2021] [Accepted: 01/14/2021] [Indexed: 11/02/2022] Open
Abstract
During pandemics, such as the one caused by SARS-CoV-2 coronavirus, simple methods to rapidly test large numbers of people are needed. As a faster and less resource-demanding alternative to detect viral RNA by conventional qPCR, we used reverse transcription loop-mediated isothermal amplification (RT-LAMP). We previously established colorimetric RT-LAMP assays on both purified and unpurified SARS-CoV-2 clinical specimens and further developed a multiplexed sequencing protocol (LAMP-sequencing) to analyze the outcome of many RT-LAMP reactions at the same time (Dao Thi et al., 2020). Extending on this work, we hereby provide step-by-step protocols for both RT-LAMP assays and read-outs.
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Affiliation(s)
- Konrad Herbst
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | | | - Simon Anders
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany.,German Cancer Research Center (DKFZ), Heidelberg, Germany.,DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Viet Loan Dao Thi
- Schaller Research Group, Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
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8
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Deckert A, Anders S, de Allegri M, Nguyen HT, Souares A, McMahon S, Boerner K, Meurer M, Herbst K, Sand M, Koeppel L, Siems T, Brugnara L, Brenner S, Burk R, Lou D, Kirrmaier D, Duan Y, Ovchinnikova S, Marx M, Kräusslich HG, Knop M, Bärnighausen T, Denkinger C. Effectiveness and cost-effectiveness of four different strategies for SARS-CoV-2 surveillance in the general population (CoV-Surv Study): a structured summary of a study protocol for a cluster-randomised, two-factorial controlled trial. Trials 2021; 22:39. [PMID: 33419461 PMCID: PMC7791150 DOI: 10.1186/s13063-020-04982-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 12/16/2020] [Indexed: 11/24/2022] Open
Abstract
Objectives In this cluster-randomised controlled study (CoV-Surv Study), four different “active” SARS-CoV-2 testing strategies for general population surveillance are evaluated for their effectiveness in determining and predicting the prevalence of SARS-CoV-2 infections in a given population. In addition, the costs and cost-effectiveness of the four surveillance strategies will be assessed. Further, this trial is supplemented by a qualitative component to determine the acceptability of each strategy. Findings will inform the choice of the most effective, acceptable and affordable strategy for SARS-CoV-2 surveillance, with the most effective and cost-effective strategy becoming part of the local public health department’s current routine health surveillance activities. Investigating its everyday performance will allow us to examine the strategy’s applicability to real time prevalence prediction and the usefulness of the resulting information for local policy makers to implement countermeasures that effectively prevent future nationwide lockdowns. The authors would like to emphasize the importance and relevance of this study and its expected findings in the context of population-based disease surveillance, especially in respect to the current SARS-CoV-2 pandemic. In Germany, but also in many other countries, COVID-19 surveillance has so far largely relied on passive surveillance strategies that identify individuals with clinical symptoms, monitor those cases who then tested positive for the virus, followed by tracing of individuals in close contact to those positive cases. To achieve higher effectiveness in population surveillance and to reliably predict the course of an outbreak, screening and monitoring of infected individuals without major symptoms (about 40% of the population) will be necessary. While current testing capacities are also used to identify such asymptomatic cases, this rather passive approach is not suitable in generating reliable population-based estimates of the prevalence of asymptomatic carriers to allow any dependable predictions on the course of the pandemic. To better control and manage the SARS-CoV-2 pandemic, current strategies therefore need to be complemented by an active surveillance of the wider population, i.e. routinely conducted testing and monitoring activities to identify and isolate infected individuals regardless of their clinical symptoms. Such active surveillance strategies will enable more effective prevention of the spread of the virus as they can generate more precise population-based parameters during a pandemic. This essential information will be required in order to determine the best strategic and targeted short-term countermeasures to limit infection spread locally. Trial design This trial implements a cluster-randomised, two-factorial controlled, prospective, interventional, single-blinded design with four study arms, each representing a different SARS-CoV-2 testing and surveillance strategy. Participants Eligible are individuals age 7 years or older living in Germany’s Rhein-Neckar Region who consent to provide a saliva sample (all four arms) after completion of a brief questionnaire (two arms only). For the qualitative component, different samples of study participants and non-participants (i.e. eligible for study, but refuse to participate) will be identified for additional interviews. For these interviews, only individuals age 18 years or older are eligible. Intervention and comparator Of the four surveillance strategies to be assessed and compared, Strategy A1 is considered the gold standard for prevalence estimation and used to determine bias in other arms. To determine the cost-effectiveness, each strategy is compared to status quo, defined as the currently practiced passive surveillance approach. Strategy A1: Individuals (one per household) receive information and study material by mail with instructions on how to produce a saliva sample and how to return the sample by mail. Once received by the laboratory, the sample is tested for SARS-CoV-2 using Reverse Transcription Loop-mediated Isothermal Amplification (RT-LAMP). Strategy A2: Individuals (one per household) receive information and study material by mail with instructions on how to produce their own as well as saliva samples from each household member and how to return these samples by mail. Once received by the laboratory, the samples are tested for SARS-CoV-2 using RT-LAMP. Strategy B1: Individuals (one per household) receive information by mail on how to complete a brief pre-screening questionnaire which asks about COVID-19 related clinical symptoms and risk exposures. Only individuals whose pre-screening score crosses a defined threshold, will then receive additional study material by mail with instructions on how to produce a saliva sample and how to return the sample by mail. Once received by the laboratory, the saliva sample is tested for SARS-CoV-2 using RT-LAMP. Strategy B2: Individuals (one per household) receive information by mail on how to complete a brief pre-screening questionnaire which asks about COVID-19 related clinical symptoms. Only individuals whose pre-screening score crosses a defined threshold, will then receive additional study material by mail with instructions how to produce their own as well as saliva samples from each household member and how to return these samples by mail. Once received by the laboratory, the samples are tested for SARS-CoV-2 using RT-LAMP. In each strategy, RT-LAMP positive samples are additionally analyzed with qPCR in order to minimize the number of false positives. Main outcomes The identification of the one best strategy will be determined by a set of parameters. Primary outcomes include costs per correctly screened person, costs per positive case, positive detection rate, and precision of positive detection rate. Secondary outcomes include participation rate, costs per asymptomatic case, prevalence estimates, number of asymptomatic cases per study arm, ratio of symptomatic to asymptomatic cases per study arm, participant satisfaction. Additional study components (not part of the trial) include cost effectiveness of each of the four surveillance strategies compared to passive monitoring (i.e. status quo), development of a prognostic model to predict hospital utilization caused by SARS-CoV-2, time from test shipment to test application and time from test shipment to test result, and perception and preferences of the persons to be tested with regard to test strategies. Randomisation Samples are drawn in three batches of three continuous weeks. Randomisation follows a two-stage process. First, a total of 220 sampling points have been allocated to the three different batches. To obtain an integer solution, the Cox-algorithm for controlled rounding has been used. Afterwards, sample points have been drawn separately per batch, following a probability proportional to size (PPS) random sample. Second, for each cluster the same number of residential addresses is randomly sampled from the municipal registries (self-weighted sample of individuals). The 28,125 addresses drawn per municipality are then randomly allocated to the four study arms A1, A2, B1, and B2 in the ratio 5 to 2.5 to 14 to 7 based on the expected response rates in each arm and the sensitivity and specificity of the pre-screening tool as applied in strategy B1 and B2. Based on the assumptions, this allocation should yield 2500 saliva samples in each strategy. Although a municipality can be sampled by multiple batches and the overall number of addresses per municipality might vary, the number of addresses contacted in each arm is kept constant. Blinding (masking) The design is single-blinded, meaning the staff conducting the SARS-CoV-2 tests are unaware of the study arm assignment of each single participant and test sample. Sample sizes Total sample size for the trial is 10,000 saliva samples equally allocated to the four study arms (i.e. 2,500 participants per arm). For the qualitative component, up to 60 in-depth interviews will be conducted with about 30 study participants (up to 15 in each arm A and B) and 30 participation refusers (up to 15 in each arm A and B) purposefully selected from the quantitative study sample to represent a variety of gender and ages to explore experiences with admission or rejection of study participation. Up to 25 asymptomatic SARS-CoV-2 positive study participants will be purposefully selected to explore the way in which asymptomatic men and women diagnosed with SARS-CoV-2 give meaning to their diagnosis and to the dialectic between feeling concurrently healthy and yet also being at risk for transmitting COVID-19. In addition, 100 randomly selected study participants will be included to explore participants’ perspective on testing processes and implementation. Trial Status Final protocol version is “Surveillance_Studienprotokoll_03Nov2020_v1_2” from November 3, 2020. Recruitment started November 18, 2020 and is expected to end by or before December 31, 2020. Trial registration The trial is currently being registered with the German Clinical Trials Register (Deutsches Register Klinischer Studien), DRKS00023271 (https://www.drks.de/drks_web/navigate.do?navigationId=trial. HTML&TRIAL_ID=DRKS00023271). Retrospectively registered 30 November 2020. Full protocol The full protocol is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest in expediting dissemination of this material, the familiar formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol.
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Affiliation(s)
- Andreas Deckert
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 324, 69120, Heidelberg, Germany.
| | - Simon Anders
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Manuela de Allegri
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 130.1, 69120, Heidelberg, Germany
| | - Hoa Thi Nguyen
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 365, 69120, Heidelberg, Germany
| | - Aurélia Souares
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 130.1, 69120, Heidelberg, Germany
| | - Shannon McMahon
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 130.1, 69120, Heidelberg, Germany
| | - Kathleen Boerner
- Department of Infectious Diseases, Virology, University of Heidelberg, Im Neuenheimer Feld 267, 69120, Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Konrad Herbst
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Matthias Sand
- GESIS Leibniz-Institute for the Social Sciences, B2/1, 68159, Mannheim, Germany
| | - Lisa Koeppel
- Section Clinical Tropical Medicine, University of Heidelberg, Im Neuenheimer Feld 324, 69120, Heidelberg, Germany
| | - Tobias Siems
- Institute for Applied Mathematics, University of Heidelberg, Berliner Str. 41-49, 69120, Heidelberg, Germany
| | - Lucia Brugnara
- evaplan GmbH, University of Heidelberg, Ringstr.19b, 69115, Heidelberg, Germany
| | - Stephan Brenner
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 130.1, 69120, Heidelberg, Germany
| | - Robin Burk
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Dan Lou
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Daniel Kirrmaier
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Yuanqiang Duan
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Svetlana Ovchinnikova
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Michael Marx
- Heidelberg Institute of Global Health/evaplan GmbH, University of Heidelberg, Im Neuenheimer Feld 130.1, 69120, Heidelberg, Germany
| | - Hans Georg Kräusslich
- Center for Integrative Infectious Disease Research (CIID), University of Heidelberg, Im Neuenheimer Feld 344, 69120, Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120, Heidelberg, Germany
| | - Till Bärnighausen
- Heidelberg Institute of Global Health, University of Heidelberg, Im Neuenheimer Feld 130.1, 69120, Heidelberg, Germany
| | - Claudia Denkinger
- Section Clinical Tropical Medicine, University of Heidelberg, Im Neuenheimer Feld 324, 69120, Heidelberg, Germany
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9
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Baldering TN, Karathanasis C, Harwardt MLIE, Freund P, Meurer M, Rahm JV, Knop M, Dietz MS, Heilemann M. CRISPR/Cas12a-mediated labeling of MET receptor enables quantitative single-molecule imaging of endogenous protein organization and dynamics. iScience 2020; 24:101895. [PMID: 33364584 PMCID: PMC7753144 DOI: 10.1016/j.isci.2020.101895] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 11/12/2020] [Accepted: 12/02/2020] [Indexed: 12/31/2022] Open
Abstract
Single-molecule localization microscopy (SMLM) reports on protein organization in cells with near-molecular resolution and in combination with stoichiometric labeling enables protein counting. Fluorescent proteins allow stoichiometric labeling of cellular proteins; however, most methods either lead to overexpression or are complex and time demanding. We introduce CRISPR/Cas12a for simple and efficient tagging of endogenous proteins with a photoactivatable protein for quantitative SMLM and single-particle tracking. We constructed a HEK293T cell line with the receptor tyrosine kinase MET tagged with mEos4b and demonstrate full functionality. We determine the oligomeric state of MET with quantitative SMLM and find a reorganization from monomeric to dimeric MET upon ligand stimulation. In addition, we measured the mobility of single MET receptors in vivo in resting and ligand-treated cells. The combination of CRISPR/Cas12a-assisted endogenous protein labeling and super-resolution microscopy represents a powerful tool for cell biological research with molecular resolution. CRISPR/Cas12a enables endogenous protein labeling for super-resolution microscopy HEK293T cells were generated with MET endogenously labeled with mEos4b Quantitative PALM microscopy reports efficient dimerization of MET receptor Single-particle tracking shows increased MET immobilization upon ligand treatment
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Affiliation(s)
- Tim N Baldering
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
| | - Christos Karathanasis
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
| | - Marie-Lena I E Harwardt
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
| | - Petra Freund
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), 69120 Heidelberg, Germany
| | - Johanna V Rahm
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), 69120 Heidelberg, Germany.,German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Marina S Dietz
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
| | - Mike Heilemann
- Single Molecule Biophysics, Institute of Physical and Theoretical Chemistry, Goethe University Frankfurt, Max-von-Laue Str. 7, 60438 Frankfurt, Germany
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10
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Dao Thi VL, Herbst K, Boerner K, Meurer M, Kremer LP, Kirrmaier D, Freistaedter A, Papagiannidis D, Galmozzi C, Stanifer ML, Boulant S, Klein S, Chlanda P, Khalid D, Barreto Miranda I, Schnitzler P, Kräusslich HG, Knop M, Anders S. A colorimetric RT-LAMP assay and LAMP-sequencing for detecting SARS-CoV-2 RNA in clinical samples. Sci Transl Med 2020; 12:eabc7075. [PMID: 32719001 PMCID: PMC7574920 DOI: 10.1126/scitranslmed.abc7075] [Citation(s) in RCA: 404] [Impact Index Per Article: 101.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/23/2020] [Indexed: 12/14/2022]
Abstract
The coronavirus disease 2019 (COVID-19) pandemic caused by the SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2) coronavirus is a major public health challenge. Rapid tests for detecting existing SARS-CoV-2 infections and assessing virus spread are critical. Approaches to detect viral RNA based on reverse transcription loop-mediated isothermal amplification (RT-LAMP) have potential as simple, scalable, and broadly applicable testing methods. Compared to RT quantitative polymerase chain reaction (RT-qPCR)-based methods, RT-LAMP assays require incubation at a constant temperature, thus eliminating the need for sophisticated instrumentation. Here, we tested a two-color RT-LAMP assay protocol for detecting SARS-CoV-2 viral RNA using a primer set specific for the N gene. We tested our RT-LAMP assay on surplus RNA samples isolated from 768 pharyngeal swab specimens collected from individuals being tested for COVID-19. We determined the sensitivity and specificity of the RT-LAMP assay for detecting SARS-CoV-2 viral RNA. Compared to an RT-qPCR assay using a sensitive primer set, we found that the RT-LAMP assay reliably detected SARS-CoV-2 RNA with an RT-qPCR cycle threshold (CT) number of up to 30, with a sensitivity of 97.5% and a specificity of 99.7%. We also developed a swab-to-RT-LAMP assay that did not require a prior RNA isolation step, which retained excellent specificity (99.5%) but showed lower sensitivity (86% for CT < 30) than the RT-LAMP assay. In addition, we developed a multiplexed sequencing protocol (LAMP-sequencing) as a diagnostic validation procedure to detect and record the outcome of RT-LAMP reactions.
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Affiliation(s)
- Viet Loan Dao Thi
- Schaller Research Groups, Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany.
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Konrad Herbst
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Kathleen Boerner
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- German Center for Infection Research (DZIF), Heidelberg, Germany
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
| | - Lukas Pm Kremer
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Daniel Kirrmaier
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Andrew Freistaedter
- Schaller Research Groups, Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | | | - Carla Galmozzi
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany
- DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Megan L Stanifer
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Steeve Boulant
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Steffen Klein
- Schaller Research Groups, Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Petr Chlanda
- Schaller Research Groups, Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Dina Khalid
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | | | - Paul Schnitzler
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
| | - Hans-Georg Kräusslich
- Department of Infectious Diseases, Virology, Heidelberg University, Heidelberg, Germany
- German Center for Infection Research (DZIF), Heidelberg, Germany
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany.
- German Cancer Research Center (DKFZ), Heidelberg, Germany
- DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Simon Anders
- Center for Molecular Biology of Heidelberg University (ZMBH), Heidelberg, Germany.
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11
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Klein S, Müller TG, Khalid D, Sonntag-Buck V, Heuser AM, Glass B, Meurer M, Morales I, Schillak A, Freistaedter A, Ambiel I, Winter SL, Zimmermann L, Naumoska T, Bubeck F, Kirrmaier D, Ullrich S, Barreto Miranda I, Anders S, Grimm D, Schnitzler P, Knop M, Kräusslich HG, Dao Thi VL, Börner K, Chlanda P. SARS-CoV-2 RNA Extraction Using Magnetic Beads for Rapid Large-Scale Testing by RT-qPCR and RT-LAMP. Viruses 2020; 12:E863. [PMID: 32784757 PMCID: PMC7472728 DOI: 10.3390/v12080863] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/31/2020] [Accepted: 08/05/2020] [Indexed: 01/01/2023] Open
Abstract
Rapid large-scale testing is essential for controlling the ongoing pandemic of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The standard diagnostic pipeline for testing SARS-CoV-2 presence in patients with an ongoing infection is predominantly based on pharyngeal swabs, from which the viral RNA is extracted using commercial kits, followed by reverse transcription and quantitative PCR detection. As a result of the large demand for testing, commercial RNA extraction kits may be limited and, alternatively, non-commercial protocols are needed. Here, we provide a magnetic bead RNA extraction protocol that is predominantly based on in-house made reagents and is performed in 96-well plates supporting large-scale testing. Magnetic bead RNA extraction was benchmarked against the commercial QIAcube extraction platform. Comparable viral RNA detection sensitivity and specificity were obtained by fluorescent and colorimetric reverse transcription loop-mediated isothermal amplification (RT-LAMP) using a primer set targeting the N gene, as well as RT-qPCR using a primer set targeting the E gene, showing that the RNA extraction protocol presented here can be combined with a variety of detection methods at high throughput. Importantly, the presented diagnostic workflow can be quickly set up in a laboratory without access to an automated pipetting robot.
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Affiliation(s)
- Steffen Klein
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- Schaller Research Groups, Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Thorsten G. Müller
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Dina Khalid
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Vera Sonntag-Buck
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Anke-Mareil Heuser
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Bärbel Glass
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Matthias Meurer
- Center for Molecular Biology of Heidelberg University (ZMBH), 69120 Heidelberg, Germany; (M.M.); (D.K.); (S.A.); (M.K.)
- German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Ivonne Morales
- Center of Infectious Diseases, Clinical Tropical Medicine, Heidelberg University Hospital, 69120 Heidelberg, Germany;
| | - Angelika Schillak
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Andrew Freistaedter
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Ina Ambiel
- Center of Infectious Diseases, Integrative Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany;
| | - Sophie L. Winter
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- Schaller Research Groups, Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Liv Zimmermann
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Tamara Naumoska
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Felix Bubeck
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Daniel Kirrmaier
- Center for Molecular Biology of Heidelberg University (ZMBH), 69120 Heidelberg, Germany; (M.M.); (D.K.); (S.A.); (M.K.)
- German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Stephanie Ullrich
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Isabel Barreto Miranda
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Simon Anders
- Center for Molecular Biology of Heidelberg University (ZMBH), 69120 Heidelberg, Germany; (M.M.); (D.K.); (S.A.); (M.K.)
| | - Dirk Grimm
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- German Center for Infection Research (DZIF), 69120 Heidelberg, Germany
| | - Paul Schnitzler
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
| | - Michael Knop
- Center for Molecular Biology of Heidelberg University (ZMBH), 69120 Heidelberg, Germany; (M.M.); (D.K.); (S.A.); (M.K.)
- German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
- DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Hans-Georg Kräusslich
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- German Center for Infection Research (DZIF), 69120 Heidelberg, Germany
| | - Viet Loan Dao Thi
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- Schaller Research Groups, Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Kathleen Börner
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- German Center for Infection Research (DZIF), 69120 Heidelberg, Germany
| | - Petr Chlanda
- Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany; (S.K.); (T.G.M.); (D.K.); (V.S.-B.); (A.-M.H.); (B.G.); (A.S.); (A.F.); (S.L.W.); (L.Z.); (T.N.); (F.B.); (S.U.); (I.B.M.); (D.G.); (P.S.); (H.-G.K.); (V.L.D.T.)
- Schaller Research Groups, Center of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany
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12
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Fueller J, Herbst K, Meurer M, Gubicza K, Kurtulmus B, Knopf JD, Kirrmaier D, Buchmuller BC, Pereira G, Lemberg MK, Knop M. CRISPR-Cas12a-assisted PCR tagging of mammalian genes. J Cell Biol 2020; 219:e201910210. [PMID: 32406907 PMCID: PMC7265327 DOI: 10.1083/jcb.201910210] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 02/10/2020] [Accepted: 03/26/2020] [Indexed: 12/20/2022] Open
Abstract
Here we describe a time-efficient strategy for endogenous C-terminal gene tagging in mammalian tissue culture cells. An online platform is used to design two long gene-specific oligonucleotides for PCR with generic template cassettes to create linear dsDNA donors, termed PCR cassettes. PCR cassettes encode the tag (e.g., GFP), a Cas12a CRISPR RNA for cleavage of the target locus, and short homology arms for directed integration via homologous recombination. The integrated tag is coupled to a generic terminator shielding the tagged gene from the co-inserted auxiliary sequences. Co-transfection of PCR cassettes with a Cas12a-encoding plasmid leads to robust endogenous expression of tagged genes, with tagging efficiency of up to 20% without selection, and up to 60% when selection markers are used. We used target-enrichment sequencing to investigate all potential sources of artifacts. Our work outlines a quick strategy particularly suitable for exploratory studies using endogenous expression of fluorescent protein-tagged genes.
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Affiliation(s)
- Julia Fueller
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Konrad Herbst
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Krisztina Gubicza
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Bahtiyar Kurtulmus
- Center for Organismal Studies, University of Heidelberg and DKFZ, DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Julia D. Knopf
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Daniel Kirrmaier
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
- Cell Morphogenesis and Signal Transduction, DKFZ-ZMBH Alliance and DKFZ, Heidelberg, Germany
| | - Benjamin C. Buchmuller
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Gislene Pereira
- Center for Organismal Studies, University of Heidelberg and DKFZ, DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Marius K. Lemberg
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), German Cancer Research Center (DKFZ)-ZMBH Alliance, Heidelberg, Germany
- Cell Morphogenesis and Signal Transduction, DKFZ-ZMBH Alliance and DKFZ, Heidelberg, Germany
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13
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Dubreuil B, Sass E, Nadav Y, Heidenreich M, Georgeson JM, Weill U, Duan Y, Meurer M, Schuldiner M, Knop M, Levy ED. YeastRGB: comparing the abundance and localization of yeast proteins across cells and libraries. Nucleic Acids Res 2020; 47:D1245-D1249. [PMID: 30357397 PMCID: PMC6324022 DOI: 10.1093/nar/gky941] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/18/2018] [Indexed: 01/06/2023] Open
Abstract
The ability to measure the abundance and visualize the localization of proteins across the yeast proteome has stimulated hypotheses on gene function and fueled discoveries. While the classic C’ tagged GFP yeast library has been the only resource for over a decade, the recent development of the SWAT technology has led to the creation of multiple novel yeast libraries where new-generation fluorescent reporters are fused at the N’ and C’ of open reading frames. Efficient access to these data requires a user interface to visualize and compare protein abundance, localization and co-localization across cells, strains, and libraries. YeastRGB (www.yeastRGB.org) was designed to address such a need, through a user-friendly interface that maximizes informative content. It employs a compact display where cells are cropped and tiled together into a ‘cell-grid.’ This representation enables viewing dozens of cells for a particular strain within a display unit, and up to 30 display units can be arrayed on a standard high-definition screen. Additionally, the display unit allows users to control zoom-level and overlay of images acquired using different color channels. Thus, YeastRGB makes comparing abundance and localization efficient, across thousands of cells from different strains and libraries.
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Affiliation(s)
- Benjamin Dubreuil
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Ehud Sass
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Yotam Nadav
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Meta Heidenreich
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Joseph M Georgeson
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Uri Weill
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Yuanqiang Duan
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - Maya Schuldiner
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany.,Cell Morphogenesis and Signal Transduction, DKFZ-ZMBH Alliance and German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Emmanuel D Levy
- Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel
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14
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Devarajan S, Meurer M, van Roermund CWT, Chen X, Hettema EH, Kemp S, Knop M, Williams C. Proteasome-dependent protein quality control of the peroxisomal membrane protein Pxa1p. Biochim Biophys Acta Biomembr 2020; 1862:183342. [PMID: 32416190 DOI: 10.1016/j.bbamem.2020.183342] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 05/02/2020] [Accepted: 05/04/2020] [Indexed: 10/24/2022]
Abstract
Peroxisomes are eukaryotic organelles that function in numerous metabolic pathways and defects in peroxisome function can cause serious developmental brain disorders such as adrenoleukodystrophy (ALD). Peroxisomal membrane proteins (PMPs) play a crucial role in regulating peroxisome function. Therefore, PMP homeostasis is vital for peroxisome function. Recently, we established that certain PMPs are degraded by the Ubiquitin Proteasome System yet little is known about how faulty/non-functional PMPs undergo quality control. Here we have investigated the degradation of Pxa1p, a fatty acid transporter in the yeast Saccharomyces cerevisiae. Pxa1p is a homologue of the human protein ALDP and mutations in ALDP result in the severe disorder ALD. By introducing two corresponding ALDP mutations into Pxa1p (Pxa1MUT), fused to mGFP, we show that Pxa1MUT-mGFP is rapidly degraded from peroxisomes in a proteasome-dependent manner, while wild type Pxa1-mGFP remains relatively stable. Furthermore, we identify a role for the ubiquitin ligase Ufd4p in Pxa1MUT-mGFP degradation. Finally, we establish that inhibiting Pxa1MUT-mGFP degradation results in a partial rescue of Pxa1p activity in cells. Together, our data demonstrate that faulty PMPs can undergo proteasome-dependent quality control. Furthermore, our observations may provide new insights into the role of ALDP degradation in ALD.
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Affiliation(s)
- S Devarajan
- Department of Cell Biochemistry, University of Groningen, the Netherlands
| | - M Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany
| | - C W T van Roermund
- Laboratory Genetic Metabolic Diseases, Amsterdam University Medical Centres, the Netherlands
| | - X Chen
- Department of Cell Biochemistry, University of Groningen, the Netherlands
| | - E H Hettema
- Department of Molecular Biology, University of Sheffield, Sheffield, United Kingdom
| | - S Kemp
- Laboratory Genetic Metabolic Diseases, Amsterdam University Medical Centres, the Netherlands
| | - M Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg, Germany; Cell Morphogenesis and Signal Transduction, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - C Williams
- Department of Cell Biochemistry, University of Groningen, the Netherlands.
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15
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Abstract
Albinism can be divided into oculocutaneous albinism (OCA) and ocular albinism (OA). In the differential diagnostics these can be distinguished from rarer syndromes with partial albinism, which are frequently associated with susceptibility to infections and neurological symptoms. The OCA is an autosomal recessive inherited disease of melanin biosynthesis, which leads to complete or partial loss of melanin in the skin, hair follicles and eyes. Of the seven currently known subtypes (OCA 1-7), four are well-characterized (OCA 1-4). These are based on gene mutations, which code for tyrosinase, a key enzyme in melanin synthesis and for further proteins. These play an important role in the catalytic activity of tyrosinase and the structure and function of melanosomes. In the presence of these subtypes, the clinical symptoms and the course of the disease show a pronounced variability, especially in the type and extent of pigmentation of the skin and hair as well as the severity of eye involvement, which makes the phenotypic classification difficult. Treatment priorities are a consistent protection from UV light for prophylaxis against skin cancer and regular preventive investigations. The ocular alterations typical for albinism necessitate timely diagnostics and care by institutions specialized in ophthalmology. Novel strategies for systemic treatment of subtypes of albinism are in preclinical testing. The OA without skin involvement shows X‑linked inheritance, is much rarer and is characterized by reduced pigmentation of the retina and iris, nystagmus and macular hypoplasia, sometimes with substantial loss of visual acuity. The typical ocular symptoms of OA can be manifested to a varying extent in all forms of OCA.
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Affiliation(s)
- A S Kubasch
- UniversitätsCentrum für Seltene Erkrankungen, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland
| | - M Meurer
- Stiftung Hochschulmedizin Dresden, Universitätsklinikum Carl Gustav Carus, Technische Universität Dresden, Dresden, Deutschland.
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16
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Meurer M, Günther C. [37-year-old male with confluent papules and arcuate erythematosquamous plaques on the upper trunk and arms : Preparation for the specialist examination: part 22]. Hautarzt 2018; 69:173-176. [PMID: 30374546 DOI: 10.1007/s00105-018-4297-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- M Meurer
- Stiftung zur Förderung der Hochschulmedizin in Dresden, Fetscherstr. 74, 01307, Dresden, Deutschland.
| | - C Günther
- Klinik und Poliklinik für Dermatologie, Universitätsklinikum Carl Gustav Carus, Dresden, Deutschland
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Castells-Ballester J, Zatorska E, Meurer M, Neubert P, Metschies A, Knop M, Strahl S. Monitoring Protein Dynamics in Protein O-Mannosyltransferase Mutants In Vivo by Tandem Fluorescent Protein Timers. Molecules 2018; 23:E2622. [PMID: 30322079 PMCID: PMC6222916 DOI: 10.3390/molecules23102622] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/05/2018] [Accepted: 10/09/2018] [Indexed: 12/27/2022] Open
Abstract
For proteins entering the secretory pathway, a major factor contributing to maturation and homeostasis is glycosylation. One relevant type of protein glycosylation is O-mannosylation, which is essential and evolutionarily-conserved in fungi, animals, and humans. Our recent proteome-wide study in the eukaryotic model organism Saccharomyces cerevisiae revealed that more than 26% of all proteins entering the secretory pathway receive O-mannosyl glycans. In a first attempt to understand the impact of O-mannosylation on these proteins, we took advantage of a tandem fluorescent timer (tFT) reporter to monitor different aspects of protein dynamics. We analyzed tFT-reporter fusions of 137 unique O-mannosylated proteins, mainly of the secretory pathway and the plasma membrane, in mutants lacking the major protein O-mannosyltransferases Pmt1, Pmt2, or Pmt4. In these three pmtΔ mutants, a total of 39 individual proteins were clearly affected, and Pmt-specific substrate proteins could be identified. We observed that O-mannosylation may cause both enhanced and diminished protein abundance and/or stability when compromised, and verified our findings on the examples of Axl2-tFT and Kre6-tFT fusion proteins. The identified target proteins are a valuable resource towards unraveling the multiple functions of O-mannosylation at the molecular level.
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Affiliation(s)
| | - Ewa Zatorska
- Centre for Organismal Studies (COS), Heidelberg University, 69120 Heidelberg, Germany.
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg University, 69120 Heidelberg, Germany.
| | - Patrick Neubert
- Centre for Organismal Studies (COS), Heidelberg University, 69120 Heidelberg, Germany.
| | - Anke Metschies
- Centre for Organismal Studies (COS), Heidelberg University, 69120 Heidelberg, Germany.
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, Heidelberg University, 69120 Heidelberg, Germany.
- Deutsches Krebsforschungszentrum (DKFZ), DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany.
| | - Sabine Strahl
- Centre for Organismal Studies (COS), Heidelberg University, 69120 Heidelberg, Germany.
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18
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Stein A, Hackert I, Sebastian G, Meurer M, Griming T, Liepe K, Pinkert J, Franke WG, Kropp J. Accuracy of the intra-operative radioauided localization of the sentinel lymph node (SLN) 24 hours after lymphoscintigraphy in patients with malignant melanoma. Nuklearmedizin 2018. [DOI: 10.1055/s-0038-1623876] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Summary
Aim: For optimized logistics for the sentinel lymph-adenectomy (SL) it might be helpful for the clinics involved if a longer time period between the lymphoscintigraphy (LS) and surgery is possible. Therefore, we investigated if a precise localization of the sentinel lymph node is possible 24 hours after LS. Methods: 78 patients with primary malignant melanoma (MM; η = 44) or with MM pre-operated by excisional biopsy (n = 34) were investigated. In 40 cases the tumor was localized on the trunk and in 38 cases on the extremities. Mean MM thickness was 2.68 mm (range: 0.29 to 12 mm). In all patients a lymphoscintigraphy (LS) with an average of 85 MBq of Tc-99m nanocolloid was performed one day prior to surgery. Immediately after tracer application dynamic data acquisition was started at a LFOV gamma camera followed by a whole body scan. With a hand-held gamma detector (C-Trak®) 2,4,6,8, and 24 hours after tracer administration the SLN was identified and the counts registered. Results: 94 SLNs were identified in 87 lymphatic basins from which 86 could be resected. Nine MM showed two draining channels. After 24 hours 15.5% (as an average) of the initial counts could be measured in the SLN. The uptake in the SLN in pre-operated versus patients with primary tumor was statistically not significant (p = 0.4). In 16 cases (20.5%) the SLN was tumor positive. Four of those patients developed distant metastases and two died within the first year. None of the patients with negative SLN developed distant metastases or died. Conclusion: The remaining activity in the SLN up to 24 hours after administration is sufficient for their intra operative localization. The method of lymphoscintigraphy and localization of the SLN by a hand-held gamma detector optimizes the intra operative identification of the SLN in patients with malignant melanoma.
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19
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Bunina D, Štefl M, Huber F, Khmelinskii A, Meurer M, Barry JD, Kats I, Kirrmaier D, Huber W, Knop M. Upregulation of SPS100 gene expression by an antisense RNA via a switch of mRNA isoforms with different stabilities. Nucleic Acids Res 2017; 45:11144-11158. [PMID: 28977638 PMCID: PMC5737743 DOI: 10.1093/nar/gkx737] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 08/09/2017] [Accepted: 08/21/2017] [Indexed: 12/19/2022] Open
Abstract
Pervasive transcription of genomes generates multiple classes of non-coding RNAs. One of these classes are stable long non-coding RNAs which overlap coding genes in antisense direction (asRNAs). The function of such asRNAs is not fully understood but several cases of antisense-dependent gene expression regulation affecting the overlapping genes have been demonstrated. Using high-throughput yeast genetics and a limited set of four growth conditions we previously reported a regulatory function for ∼25% of asRNAs, most of which repress the expression of the sense gene. To further explore the roles of asRNAs we tested more conditions and identified 15 conditionally antisense-regulated genes, 6 of which exhibited antisense-dependent enhancement of gene expression. We focused on the sporulation-specific gene SPS100, which becomes upregulated upon entry into starvation or sporulation as a function of the antisense transcript SUT169. We demonstrate that the antisense effect is mediated by its 3' intergenic region (3'-IGR) and that this regulation can be transferred to other genes. Genetic analysis revealed that SUT169 functions by changing the relative expression of SPS100 mRNA isoforms from a short and unstable transcript to a long and stable species. These results suggest a novel mechanism of antisense-dependent gene regulation via mRNA isoform switching.
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Affiliation(s)
- Daria Bunina
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Martin Štefl
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Florian Huber
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Anton Khmelinskii
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Joseph D. Barry
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany
| | - Ilia Kats
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Daniel Kirrmaier
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
- Deutsches Krebsforschungszentrum (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Wolfgang Huber
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
- Deutsches Krebsforschungszentrum (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
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Abstract
Systemic drug treatment of vitiligo is currently limited to predominantly adjuvant measures for increasing the effectiveness of UV light therapy. We here present new approaches for the systemic treatment of vitiligo currently under clinical investigation. These include the α‑MSH-analogue afamelatonide and oral immunosuppressants such as the Janus kinase (JAK) inhibitors which target interferon-α-dependent autotoxic inflammatory reactions. In 2015 the first publications on the successful systemic use of Janus kinase (JAK) inhibitors in vitiligo appeared. The effectiveness was experimentally supported by animal models of vitiligo and by the characterization of new biomarkers in the serum of vitiligo patients. This may significantly expand the range of treatment options for vitiligo. Topical antiinflammatory and UV therapies are still the main components of vitiligo treatment, often in combination. The main outcome parameters include the extent and duration of repigmentation, cessation of spreading, avoidance of side effects and improvement in the quality of life of patients.
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Affiliation(s)
- M Meurer
- Stiftung zur Förderung der Hochschulmedizin in Dresden, Fetscherstr. 74, 01307, Dresden, Deutschland. .,Dr. A.R. Shamma Medical Center, Jumeira 1, Dubai, Vereinigte Arabische Emirate.
| | - P Ceric-Dehdari
- Emirates Hospital Group Cosmesurge, Dubai, Vereinigte Arabische Emirate
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21
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Affiliation(s)
- M Meurer
- Stiftung zur Förderung der Hochschulmedizin in Dresden, Fetscherstr. 74, 01307, Dresden, Deutschland.
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Meurer M, Duffaud F, Salas S, Bertucci F, Floquet A, Penel N, Ray-Coquard I, Italiano A, Blay JY, Pautier P, Delannes M, Piperno-Neumann S, Mancini J, Auriche M. Localized undifferentiated endometrial sarcomas (LUES): Results of a French Sarcoma Group (FSG) retrospective series of 39 patients (pts). Ann Oncol 2017. [DOI: 10.1093/annonc/mdx387.012] [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: 11/13/2022] Open
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Meurer M, Chevyreva V, Cerulus B, Knop M. The regulatableMAL32promoter inSaccharomyces cerevisiae: characteristics and tools to facilitate its use. Yeast 2016; 34:39-49. [DOI: 10.1002/yea.3214] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 09/01/2016] [Accepted: 09/23/2016] [Indexed: 11/09/2022] Open
Affiliation(s)
- Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg; University of Heidelberg; Im Neuenheimer Feld 282 69120 Heidelberg Germany
| | - Veronika Chevyreva
- Zentrum für Molekulare Biologie der Universität Heidelberg; University of Heidelberg; Im Neuenheimer Feld 282 69120 Heidelberg Germany
| | - Bram Cerulus
- KU Leuven Department Microbiële en Moleculaire Systemen; CMPG Laboratory of Genetics and Genomics; Gaston Geenslaan 1 3001 Leuven Belgium
- VIB Laboratory of Systems Biology; Gaston Geenslaan 1 3001 Leuven Belgium
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg; University of Heidelberg; Im Neuenheimer Feld 282 69120 Heidelberg Germany
- Deutsches Krebsforschungszentrum (DKFZ); Im Neuenheimer Feld 280 69120 Heidelberg Germany
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Huber F, Bunina D, Gupta I, Khmelinskii A, Meurer M, Theer P, Steinmetz LM, Knop M. Protein Abundance Control by Non-coding Antisense Transcription. Cell Rep 2016; 15:2625-36. [PMID: 27292640 PMCID: PMC4920891 DOI: 10.1016/j.celrep.2016.05.043] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 04/08/2016] [Accepted: 05/10/2016] [Indexed: 11/17/2022] Open
Abstract
Stable unannotated transcripts (SUTs), some of which overlap protein-coding genes in antisense direction, are a class of non-coding RNAs. While case studies have reported important regulatory roles for several of such RNAs, their general impact on protein abundance regulation of the overlapping gene is not known. To test this, we employed seamless gene manipulation to repress antisense SUTs of 162 yeast genes by using a unidirectional transcriptional terminator and a GFP tag. We found that the mere presence of antisense SUTs was not sufficient to influence protein abundance, that observed effects of antisense SUTs correlated with sense transcript start site overlap, and that the effects were generally weak and led to reduced protein levels. Antisense regulated genes showed increased H3K4 di- and trimethylation and had slightly lower than expected noise levels. Our results suggest that the functionality of antisense RNAs has gene and condition-specific components.
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Affiliation(s)
- Florian Huber
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Daria Bunina
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Ishaan Gupta
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany
| | - Anton Khmelinskii
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany
| | - Patrick Theer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany; Deutsches Krebsforschungszentrum (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Lars M Steinmetz
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstraße 1, 69117 Heidelberg, Germany; Stanford Genome Technology Center, Stanford University, Palo Alto, CA 94304, USA; Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany; Deutsches Krebsforschungszentrum (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany.
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Abstract
The range of treatment options for vitiligo has significantly expanded in the last 10 years and we can offer our patients more effective treatment strategies supported by European guidelines and consensus findings. Topical and UV therapy are-often in combination-the main components of vitiligo treatment. The main outcome parameters include extent and maintenance of gained repigmentation, cessation of spreading, avoidance of side effects and the influence of the treatment on the quality of life. The efficacy of the currently available treatments is often limited. New options include antioxidative or melanocyte-stimulating adjuvant therapies in combination with UV or laser light as well as a topical maintenance treatment to reduce the risk of recurrences. In many cases, psychological support is indicated.
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Affiliation(s)
- M Meurer
- Stiftung zur Förderung der Hochschulmedizin in Dresden, Fetscherstr. 74, 01307, Dresden, Deutschland.
| | - M Schild
- Klinik und Poliklinik für Dermatologie, Universitätsklinikum Carl Gustav Carus, Dresden, Deutschland
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Khmelinskii A, Meurer M, Ho CT, Besenbeck B, Füller J, Lemberg MK, Bukau B, Mogk A, Knop M. Incomplete proteasomal degradation of green fluorescent proteins in the context of tandem fluorescent protein timers. Mol Biol Cell 2016; 27:360-70. [PMID: 26609072 PMCID: PMC4713137 DOI: 10.1091/mbc.e15-07-0525] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 11/12/2015] [Accepted: 11/16/2015] [Indexed: 11/17/2022] Open
Abstract
Tandem fluorescent protein timers (tFTs) report on protein age through time-dependent change in color, which can be exploited to study protein turnover and trafficking. Each tFT, composed of two fluorescent proteins (FPs) that differ in maturation kinetics, is suited to follow protein dynamics within a specific time range determined by the maturation rates of both FPs. So far, tFTs have been constructed by combining slower-maturing red fluorescent proteins (redFPs) with the faster-maturing superfolder green fluorescent protein (sfGFP). Toward a comprehensive characterization of tFTs, we compare here tFTs composed of different faster-maturing green fluorescent proteins (greenFPs) while keeping the slower-maturing redFP constant (mCherry). Our results indicate that the greenFP maturation kinetics influences the time range of a tFT. Moreover, we observe that commonly used greenFPs can partially withstand proteasomal degradation due to the stability of the FP fold, which results in accumulation of tFT fragments in the cell. Depending on the order of FPs in the timer, incomplete proteasomal degradation either shifts the time range of the tFT toward slower time scales or precludes its use for measurements of protein turnover. We identify greenFPs that are efficiently degraded by the proteasome and provide simple guidelines for the design of new tFTs.
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Affiliation(s)
- Anton Khmelinskii
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Chi-Ting Ho
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Birgit Besenbeck
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Julia Füller
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Marius K Lemberg
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Bernd Bukau
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Axel Mogk
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
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Guan Y, Meurer M, Raghavan S, Rebane A, Lindquist JR, Santos S, Kats I, Davidson MW, Mazitschek R, Hughes TE, Drobizhev M, Knop M, Shah JV. Live-cell multiphoton fluorescence correlation spectroscopy with an improved large Stokes shift fluorescent protein. Mol Biol Cell 2015; 26:2054-66. [PMID: 25877871 PMCID: PMC4472016 DOI: 10.1091/mbc.e14-10-1473] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 04/03/2015] [Accepted: 04/07/2015] [Indexed: 11/11/2022] Open
Abstract
We report an improved variant of mKeima, a monomeric long Stokes shift red fluorescent protein, hmKeima8.5. The increased intracellular brightness and large Stokes shift (∼180 nm) make it an excellent partner with teal fluorescent protein (mTFP1) for multiphoton, multicolor applications. Excitation of this pair by a single multiphoton excitation wavelength (MPE, 850 nm) yields well-separable emission peaks (∼120-nm separation). Using this pair, we measure homo- and hetero-oligomerization interactions in living cells via multiphoton excitation fluorescence correlation spectroscopy (MPE-FCS). Using tandem dimer proteins and small-molecule inducible dimerization domains, we demonstrate robust and quantitative detection of intracellular protein-protein interactions. We also use MPE-FCCS to detect drug-protein interactions in the intracellular environment using a Coumarin 343 (C343)-conjugated drug and hmKeima8.5 as a fluorescence pair. The mTFP1/hmKeima8.5 and C343/hmKeima8.5 combinations, together with our calibration constructs, provide a practical and broadly applicable toolbox for the investigation of molecular interactions in the cytoplasm of living cells.
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Affiliation(s)
- Yinghua Guan
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115 Renal Division, Brigham and Women's Hospital, Boston, MA 02115
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH-Allianz, 69120 Heidelberg, Germany
| | - Sarada Raghavan
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH-Allianz, 69120 Heidelberg, Germany
| | | | - Jake R Lindquist
- Department of Cell Biology and Neuroscience, Montana State University, Bozeman, MT 59717
| | - Sofia Santos
- Center for Systems Biology, Massachusetts General Hospital, Boston, MA 02114 Instituto de Investigação do Medicamento, Faculdade de Farmácia, Universidade de Lisboa, Lisbon 1640-003, Portugal
| | - Ilia Kats
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH-Allianz, 69120 Heidelberg, Germany
| | - Michael W Davidson
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310
| | - Ralph Mazitschek
- Center for Systems Biology, Massachusetts General Hospital, Boston, MA 02114 Broad Institute of Harvard and MIT, Cambridge, MA 02142
| | - Thomas E Hughes
- Department of Cell Biology and Neuroscience, Montana State University, Bozeman, MT 59717
| | | | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg and Deutsches Krebsforschungszentrum, DKFZ-ZMBH-Allianz, 69120 Heidelberg, Germany
| | - Jagesh V Shah
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115 Renal Division, Brigham and Women's Hospital, Boston, MA 02115
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Affiliation(s)
- M Meurer
- Department of Dermatology, Ludwig-Maximilians-Universität, Munich, FRG
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Boeke D, Trautmann S, Meurer M, Wachsmuth M, Godlee C, Knop M, Kaksonen M. Quantification of cytosolic interactions identifies Ede1 oligomers as key organizers of endocytosis. Mol Syst Biol 2014; 10:756. [PMID: 25366307 PMCID: PMC4299599 DOI: 10.15252/msb.20145422] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 09/11/2014] [Accepted: 10/01/2014] [Indexed: 01/08/2023] Open
Abstract
Clathrin-mediated endocytosis is a highly conserved intracellular trafficking pathway that depends on dynamic protein-protein interactions between up to 60 different proteins. However, little is known about the spatio-temporal regulation of these interactions. Using fluorescence (cross)-correlation spectroscopy in yeast, we tested 41 previously reported interactions in vivo and found 16 to exist in the cytoplasm. These detected cytoplasmic interactions included the self-interaction of Ede1, homolog of mammalian Eps15. Ede1 is the crucial scaffold for the organization of the early stages of endocytosis. We show that oligomerization of Ede1 through its central coiled coil domain is necessary for its localization to the endocytic site and we link the oligomerization of Ede1 to its function in locally concentrating endocytic adaptors and organizing the endocytic machinery. Our study sheds light on the importance of the regulation of protein-protein interactions in the cytoplasm for the assembly of the endocytic machinery in vivo.
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Affiliation(s)
- Dominik Boeke
- European Molecular Biology Laboratory (EMBL), Heidelberg, Germany Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH) Deutsches Krebsforschungszentrum (DKFZ) DKFZ-ZMBH-Allianz, Heidelberg, Germany
| | - Susanne Trautmann
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH) Deutsches Krebsforschungszentrum (DKFZ) DKFZ-ZMBH-Allianz, Heidelberg, Germany
| | - Matthias Meurer
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH) Deutsches Krebsforschungszentrum (DKFZ) DKFZ-ZMBH-Allianz, Heidelberg, Germany
| | - Malte Wachsmuth
- European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Camilla Godlee
- European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Michael Knop
- Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH) Deutsches Krebsforschungszentrum (DKFZ) DKFZ-ZMBH-Allianz, Heidelberg, Germany
| | - Marko Kaksonen
- European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
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Glasser M, MacDowell M, Hunsaker M, Salafsky B, Nielsen K, Peters K, Meurer M. Factors and outcomes in primary care physician retention in rural areas. S Afr Fam Pract (2004) 2014. [DOI: 10.1080/20786204.2010.10874002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Kaskel P, Lange U, Sander S, Huber M, Utikal J, Leiter U, Krähn G, Meurer M, Kron M. Ultraviolet exposure and risk of melanoma and basal cell carcinoma in Ulm and Dresden, Germany. J Eur Acad Dermatol Venereol 2014; 29:134-42. [DOI: 10.1111/jdv.12488] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Accepted: 02/25/2014] [Indexed: 11/28/2022]
Affiliation(s)
| | - U. Lange
- Department of Dermatology; Technical University of Dresden; Dresden Germany
| | - S. Sander
- Institute of Epidemiology and Medical Biometry; University of Ulm; Ulm Germany
| | - M.A. Huber
- Department of Dermatology; University of Ulm; Ulm Germany
| | - J. Utikal
- Department of Dermatology; University of Ulm; Ulm Germany
- Skin Cancer Unit; German Cancer Research Center (DKFZ); Heidelberg Germany
- Department of Dermatology, Venereology and Allergology; University Medical Center Mannheim; Ruprecht-Karl University of Heidelberg; Mannheim Germany
| | - U. Leiter
- Department of Dermatology; University of Ulm; Ulm Germany
- Center of Dermato-Oncology; Department of Dermatology; University of Tübingen; Tübingen Germany
| | - G. Krähn
- Department of Dermatology; University of Ulm; Ulm Germany
| | - M. Meurer
- Department of Dermatology; Technical University of Dresden; Dresden Germany
| | - M. Kron
- Institute of Epidemiology and Medical Biometry; University of Ulm; Ulm Germany
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Hofmann M, Salgo R, Aschoff R, Luger TA, Meurer M, Bräutigam M, Thaci D. Validation of Dermaphot(®) for the assessment of steroid-induced skin atrophy. Arch Dermatol Res 2012; 305:215-21. [PMID: 23242470 DOI: 10.1007/s00403-012-1297-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 10/15/2012] [Accepted: 10/22/2012] [Indexed: 10/27/2022]
Abstract
Currently, there are no accurate and simple methods available to measure this risk of atrophy in patients treated with topical glucocorticosteroids. In the present clinical trial, we validated a new score (Dermaphot(®) score) to assess the atrophogenic potential of glucocorticosteroids. 36 healthy adult volunteers were included in an investigator-initiated, blinded, randomized, intra-individual comparison, vehicle controlled multi-centre study. Subjects were treated in a randomized manner for 3 weeks with pimecrolimus cream 1 %, mometasone furoate (1 mg/g), clobetasol propionate 0.05 % and vehicle. In addition, ultrasound examination for skin thickness was performed. Data demonstrated a direct correlation of the achieved Dermaphot(®) score and the ultrasound thickness measurements. Our study shows that the Dermaphot(®) score can be used as a simple method to evaluate the atrophogenic potential of glucocorticosteroids. Respectively, we showed that the new score is an easy, valid and sensitive new tool for early detecting and quantifying even subclinical glucocorticosteroid-induced skin damage. We demonstrated that the score is able to differentiate the extent of skin atrophy (damage) after 3 weeks of topical glucocorticosteroid application with different levels of skin transparency and levels of telangiectasia.
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Affiliation(s)
- M Hofmann
- Department of Dermatology, Venereology and Allergology, Goethe-University, Theodor-Stern Kai 7, 60590, Frankfurt/Main, Germany
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Wozel G, Meurer M. Zehn Jahre Biologics in der Dermatologie. Hautarzt 2012; 63 Suppl 1:53-8. [DOI: 10.1007/s00105-011-2296-5] [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: 11/24/2022]
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Günther C, Wozel G, Meurer M, Pfeiffer C. Up-regulation of CCL11 and CCL26 is associated with activated eosinophils in bullous pemphigoid. Clin Exp Immunol 2011; 166:145-53. [PMID: 21985360 DOI: 10.1111/j.1365-2249.2011.04464.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Eosinophils contribute to the pathogenesis of bullous pemphigoid (BP) by secretion of proinflammatory cytokines and proteases. Trafficking of eosinophils into tissue in animal models and asthma depends on interleukin-5 and a family of chemokines named eotaxins, comprising CCL11, CCL24 and CCL26. Up-regulation of CCL11 has been described in BP, but the expression of the other two members of the eotaxin-family, CCL24 and CCL26, has not been investigated. In addition to these chemokines, expression of adhesion molecules associated with eosinophil migration to the skin should be analysed. We demonstrate that similar to CCL11, the concentration of CCL26 was up-regulated in serum and blister fluid of BP patients. In contrast, the concentration of CCL24 was not elevated in sera and blister fluid of the same BP patients. In lesional skin, CCL11 and CCL26 were detected in epidermis and dermis by immunohistochemistry. In contrast to CCL11, CCL26 was expressed strongly by endothelial cells. In line with these findings, eosinophils represented the dominating cell population in BP lesional skin outnumbering other leucocytes. The percentage of eosinophils expressing very late antigen (VLA): VLA-4 (CD49d) and CD11c correlated with their quantity in tissue. Macrophage antigen (MAC)-1 (CD11b/CD18) was expressed constitutively by tissue eosinophils. In conclusion, these data link the up-regulation of the eosinophil chemotactic factor CCL26 in BP to the lesional accumulation of activated eosinophils in the skin. Thereby they broaden the understanding of BP pathogenesis and might indicate new options for therapeutic intervention.
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Affiliation(s)
- C Günther
- University Hospital for Dermatology, Technical University Dresden, Dresden, Germany.
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Khmelinskii A, Meurer M, Duishoev N, Delhomme N, Knop M. Seamless gene tagging by endonuclease-driven homologous recombination. PLoS One 2011; 6:e23794. [PMID: 21915245 PMCID: PMC3161820 DOI: 10.1371/journal.pone.0023794] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2011] [Accepted: 07/27/2011] [Indexed: 11/27/2022] Open
Abstract
Gene tagging facilitates systematic genomic and proteomic analyses but chromosomal tagging typically disrupts gene regulatory sequences. Here we describe a seamless gene tagging approach that preserves endogenous gene regulation and is potentially applicable in any species with efficient DNA double-strand break repair by homologous recombination. We implement seamless tagging in Saccharomyces cerevisiae and demonstrate its application for protein tagging while preserving simultaneously upstream and downstream gene regulatory elements. Seamless tagging is compatible with high-throughput strain construction using synthetic genetic arrays (SGA), enables functional analysis of transcription antisense to open reading frames and should facilitate systematic and minimally-invasive analysis of gene functions.
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Affiliation(s)
- Anton Khmelinskii
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Matthias Meurer
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Nurlanbek Duishoev
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Nicolas Delhomme
- Genome Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Michael Knop
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
- * E-mail:
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Khmelinskii A, Meurer M, Knop M, Schiebel E. Artificial tethering to nuclear pores promotes partitioning of extrachromosomal DNA during yeast asymmetric cell division. Curr Biol 2011; 21:R17-8. [PMID: 21215928 DOI: 10.1016/j.cub.2010.11.034] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
SUMMARY Asymmetric cell division in unicellular organisms enables sequestration of senescence factors to specific subpopulations. Accumulation of autonomously replicating sequence (ARS) plasmids, which frequently emerge from recombination within the highly repetitive ribosomal DNA locus, is linked to limited replicative life span of Saccharomyces cerevisiae cells [1]. During budding yeast cell division, ARS plasmids are retained in the ageing mother cell, such that only 1 out of 10 plasmids enters the rejuvenated bud [2]. Binding of ARS plasmids to nuclear structures retained in the mother cell was speculated to explain asymmetric plasmid segregation [2]. Association with nuclear pore complexes (NPCs) was proposed to underlie retention of ARS plasmids in the mother cell [3]. However, the role of NPCs in segregation of ARS plasmids is unclear, as NPCs are partitioned between mother and bud nuclei during mitosis [4,5]. Here we analyzed how segregation of ARS plasmids is influenced by their interaction with NPCs. We found that artificial tethering to NPCs promotes transport of ARS plasmids into the bud. Moreover, our experiments provide support for the notion that interaction with ARS plasmids does not affect movement of NPCs into the bud. We conclude that binding to NPCs cannot by itself contribute to asymmetric segregation of ARS plasmids.
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Spornraft-Ragaller P, Abraham S, Lueck C, Meurer M. Response of HIV-infected patients with syphilis to therapy with penicillin or intravenous ceftriaxone. Eur J Med Res 2011; 16:47-51. [PMID: 21463980 PMCID: PMC3353420 DOI: 10.1186/2047-783x-16-2-47] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Background Ceftriaxone is commonly used as an alternative antibiotic drug in treating syphilis but clinical data on its efficacy are limited. Objective: To evaluate the response of HIV-infected patients with active syphilis to treatment with penicillin or ceftriaxone. Methods A retrospective study involving 24 consecutive patients with a positive Veneral Disease Research Laboratory test (VDRL) and at least one specific treponemal test. 12 patients were treated with different regimens of high-dose penicillin G for at least 2 weeks. Another 12 patients were treated with ceftriaxone 1-2 g per day intravenously for 10-21 days. Results After a median follow up of 18,3 months all patients of the penicillin-treated group and 11 of 12 ceftriaxone-treated patients showed a ≥ 4-fold decline in VDRL-titers; 91% of them already within 6 months after therapy. Conclusion Our serological data demonstrate a comparable efficacy of currently recommened penicillin and ceftriaxone treatment regimens for active syphilis in HIV-infected patients.
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Affiliation(s)
- Petra Spornraft-Ragaller
- Dept. of Dermatology, University Hospital Carl Gustav Carus, Technical University of Dresden, Fetscherstr. 74, 01307 Dresden, Germany.
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Meurer M. Atypische Mykobakteriosen. Hautarzt 2011; 62:265. [DOI: 10.1007/s00105-010-2072-y] [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: 11/25/2022]
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Abstract
Seborrheic dermatitis is a frequent skin disorder in infancy and adulthood. It also often occurs in patients with HIV or neurologic disorders like Parkinson disease or mood disorders. It is characterized by greasy, yellow flakes or scales in areas of high sebaceous gland activity like the scalp, face, chest and upper back. Additionally, erythema and itching can be present. The etiology and pathogenesis of seborrheic dermatitis is unknown; however, the focus lies on the involvement of Malassezia yeasts or fatty acid metabolites of Malassezia, on hormones and immunologic factors. The diagnosis is usually a clinical one, based on history and the appearance and site of lesions. The therapy consists mainly of antifungal agents, corticosteroids, immunomodulators, and keratolytics. Because of the chronicity of the illness with frequent relapses, a treatment strategy in which effectiveness and potential side effects are weighed should be used.
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Affiliation(s)
- R Aschoff
- Klinik und Poliklinik für Dermatologie, Anstalt des öffentlichen Rechts des Freistaates Sachsen, Universitätsklinikum Carl Gustav Carus an der Technischen Universität Dresden, Fetscherstr. 74, 01307 Dresden, Deutschland.
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Meurer M. Neue kutane Arzneinebenwirkungen. Hautarzt 2010; 61:649. [DOI: 10.1007/s00105-010-1991-y] [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: 11/24/2022]
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Schmitt J, Schäkel K, Fölster-Holst R, Bauer A, Oertel R, Augustin M, Aberer W, Luger T, Meurer M. Prednisolone vs. ciclosporin for severe adult eczema. An investigator-initiated double-blind placebo-controlled multicentre trial. Br J Dermatol 2009; 162:661-8. [DOI: 10.1111/j.1365-2133.2009.09561.x] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Günther C, Meurer M, Stein A, Viehweg A, Lee-Kirsch MA. Familial chilblain lupus--a monogenic form of cutaneous lupus erythematosus due to a heterozygous mutation in TREX1. Dermatology 2009; 219:162-6. [PMID: 19478477 DOI: 10.1159/000222430] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Accepted: 03/11/2009] [Indexed: 11/19/2022] Open
Abstract
Chilblain lupus erythematosus is a rare form of cutaneous lupus erythematosus characterized by bluish red infiltrates in acral locations of the body mostly affecting middle-aged women. We recently described a familial form of chilblain lupus manifesting in early childhood caused by a heterozygous mutation in the TREX1 gene, which encodes a 3'-5' DNA exonuclease. Thus, familial chilblain lupus represents the first monogenic form of cutaneous lupus erythematosus. Here we describe the unusual clinical course of this newly defined genodermatosis in an 18-year-old female member of the family in which familial chilblain lupus was originally described.
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Affiliation(s)
- C Günther
- University Hospital for Dermatology, Technical University Dresden, Dresden, Germany.
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Hanitsch LG, Burmester GR, Witt C, Hunzelmann N, Genth E, Krieg T, Lehmacher W, Melchers I, Meurer M, Müller-Ladner U, Schulze-Lohoff E, Becker M, Sunderkoetter C, Riemekasten G. Skin sclerosis is only of limited value to identify SSc patients with severe manifestations--an analysis of a distinct patient subgroup of the German Systemic Sclerosis Network (DNSS) Register. Rheumatology (Oxford) 2009; 48:70-3. [PMID: 19056798 DOI: 10.1093/rheumatology/ken408] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVES In SSc, diagnosis and classification is based mainly on skin sclerosis. Herein, we investigated in a large multicentre cohort, to what extent skin sclerosis reflects organ involvement and additional clinical symptoms. METHODS A total of 1200 SSc patients from the register of the German Systemic Sclerosis Network (DNSS), classified as either lcSSc or dcSSc, were analysed for their serological characteristics, clinical symptoms and organ manifestations in relation to skin involvement measured by the modified Rodnan skin score (mRSS). RESULTS SSc patients with different mRSS did not differ significantly in their disease duration and in most of the clinical symptoms. They showed a similar distribution of most organ manifestations such as pulmonary arterial hypertension as well as cardiac, renal and nervous system involvement. More severe skin thickening was found to be associated with pulmonary fibrosis and gastrointestinal symptoms, as well as with digital ulcers and musculoskeletal involvement. CONCLUSIONS In patients with SSc, potentially life-threatening complications and clinical symptoms with high impact on the quality of life occur independently from the extent of skin sclerosis. The diagnosis in SSc patients with a low mRSS could be missed or they could be insufficiently treated.
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Affiliation(s)
- L G Hanitsch
- Clinic of Rheumatology and Clinical Immunology, Charité Universitätsmedizin, Charité, Berlin, Germany
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Sunderkötter C, Herrgott I, Brückner C, Moinzadeh P, Pfeiffer C, Gerss J, Hunzelmann N, Böhm M, Krieg T, Müller-Ladner U, Genth E, Schulze-Lohoff E, Meurer M, Melchers I, Riemekasten G. Comparison of patients with and without digital ulcers in systemic sclerosis: detection of possible risk factors. Br J Dermatol 2009; 160:835-43. [PMID: 19183180 DOI: 10.1111/j.1365-2133.2008.09004.x] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND Digital ulcers (DU) are a major complication in the course of systemic sclerosis (SSc). In recent years, efficacious, but expensive therapies (e.g. iloprost, sildenafil, bosentan) have been shown to improve healing or to reduce the recurrence of DU. For optimal management it would be useful to identify the risk factors for DU. Such statistical analyses have been rare because they require a high number of patients. OBJECTIVES To identify potential risk factors for DU in patients with SSc. METHODS We used the registry of the German Network for Systemic Scleroderma and evaluated the data of 1881 patients included by August 2007. We assessed potential risk factors for DU by comparing patients with (24.1%) and without active DU at time of entry (75.9%). RESULTS Multivariate analysis revealed that male sex, presence of pulmonary arterial hypertension (PAH), involvement of the oesophagus, diffuse skin sclerosis (only when PAH was present), anti-Scl70 antibodies, young age at onset of Raynaud's phenomenon (RP), and elevated erythrocyte sedimentation rate (ESR) significantly impacted on the appearance of DU. Certain combinations increased the patients' probability of presenting with DU, with the highest probability (88%) for male patients with early onset of RP, ESR>30 mm h(-1), anti-Scl70 antibodies and PAH. Patients with DU developed RP, skin sclerosis and organ involvement approximately 2-3 years earlier than patients without DU. CONCLUSIONS The results reveal possible risk factors for the occurrence of DU in SSc. As DU are prone to local complications, prophylactic vasoactive treatment for patients presenting with these factors may be justified.
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Affiliation(s)
- C Sunderkötter
- Department of Dermatology, University of Münster, Von-Esmarch-Str. 58, 48149 Münster, Germany.
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Schmitt J, Zhang Z, Wozel G, Meurer M, Kirch W. Efficacy and tolerability of biologic and nonbiologic systemic treatments for moderate-to-severe psoriasis: meta-analysis of randomized controlled trials. Br J Dermatol 2008; 159:513-26. [DOI: 10.1111/j.1365-2133.2008.08732.x] [Citation(s) in RCA: 146] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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