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Nothias LF, Schmid R, Garlet A, Cameron H, Leoty-Okombi S, André-Frei V, Fuchs R, Dorrestein PC, Ternes P. Functional metabolomics of the human scalp: a metabolic niche for Staphylococcus epidermidis. mSystems 2024; 9:e0035623. [PMID: 38206014 PMCID: PMC10878091 DOI: 10.1128/msystems.00356-23] [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: 04/24/2023] [Accepted: 11/29/2023] [Indexed: 01/12/2024] Open
Abstract
Although metabolomics data acquisition and analysis technologies have become increasingly sophisticated over the past 5-10 years, deciphering a metabolite's function from a description of its structure and its abundance in a given experimental setting is still a major scientific and intellectual challenge. To point out ways to address this "data to knowledge" challenge, we developed a functional metabolomics strategy that combines state-of-the-art data analysis tools and applied it to a human scalp metabolomics data set: skin swabs from healthy volunteers with normal or oily scalp (Sebumeter score 60-120, n = 33; Sebumeter score > 120, n = 41) were analyzed by liquid chromatography-tandem mass spectrometry (LC-MS/MS), yielding four metabolomics data sets for reversed phase chromatography (C18) or hydrophilic interaction chromatography (HILIC) separation in electrospray ionization (ESI) + or - ionization mode. Following our data analysis strategy, we were able to obtain increasingly comprehensive structural and functional annotations, by applying the Global Natural Product Social Networking (M. Wang, J. J. Carver, V. V. Phelan, L. M. Sanchez, et al., Nat Biotechnol 34:828-837, 2016, https://doi.org/10.1038/nbt.3597), SIRIUS (K. Dührkop, M. Fleischauer, M. Ludwig, A. A. Aksenov, et al., Nat Methods 16:299-302, 2019, https://doi.org/10.1038/s41592-019-0344-8), and MicrobeMASST (S. ZuffaS, R. Schmid, A. Bauermeister, P. W, P. Gomes, et al., bioRxiv:rs.3.rs-3189768, 2023, https://doi.org/10.21203/rs.3.rs-3189768/v1) tools. We finally combined the metabolomics data with a corresponding metagenomic sequencing data set using MMvec (J. T. Morton, A. A. Aksenov, L. F. Nothias, J. R. Foulds, et. al., Nat Methods 16:1306-1314, 2019, https://doi.org/10.1038/s41592-019-0616-3), gaining insights into the metabolic niche of one of the most prominent microbes on the human skin, Staphylococcus epidermidis.IMPORTANCESystems biology research on host-associated microbiota focuses on two fundamental questions: which microbes are present and how do they interact with each other, their host, and the broader host environment? Metagenomics provides us with a direct answer to the first part of the question: it unveils the microbial inhabitants, e.g., on our skin, and can provide insight into their functional potential. Yet, it falls short in revealing their active role. Metabolomics shows us the chemical composition of the environment in which microbes thrive and the transformation products they produce. In particular, untargeted metabolomics has the potential to observe a diverse set of metabolites and is thus an ideal complement to metagenomics. However, this potential often remains underexplored due to the low annotation rates in MS-based metabolomics and the necessity for multiple experimental chromatographic and mass spectrometric conditions. Beyond detection, prospecting metabolites' functional role in the host/microbiome metabolome requires identifying the biological processes and entities involved in their production and biotransformations. In the present study of the human scalp, we developed a strategy to achieve comprehensive structural and functional annotation of the metabolites in the human scalp environment, thus diving one step deeper into the interpretation of "omics" data. Leveraging a collection of openly accessible software tools and integrating microbiome data as a source of functional metabolite annotations, we finally identified the specific metabolic niche of Staphylococcus epidermidis, one of the key players of the human skin microbiome.
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Affiliation(s)
- Louis-Félix Nothias
- Collaborative Mass Spectrometry Innovation Center, University of California San Diego, La Jolla, California, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
| | - Robin Schmid
- Collaborative Mass Spectrometry Innovation Center, University of California San Diego, La Jolla, California, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Prague, Czechia
| | | | - Hunter Cameron
- BASF Corporation, Research Triangle Park, North Carolina, USA
| | | | | | | | - Pieter C. Dorrestein
- Collaborative Mass Spectrometry Innovation Center, University of California San Diego, La Jolla, California, USA
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California, USA
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An S, Lu M, Wang R, Wang J, Jiang H, Xie C, Tong J, Yu C. Ion entropy and accurate entropy-based FDR estimation in metabolomics. Brief Bioinform 2024; 25:bbae056. [PMID: 38426325 PMCID: PMC10939419 DOI: 10.1093/bib/bbae056] [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: 11/28/2023] [Revised: 01/07/2024] [Accepted: 01/25/2024] [Indexed: 03/02/2024] Open
Abstract
Accurate metabolite annotation and false discovery rate (FDR) control remain challenging in large-scale metabolomics. Recent progress leveraging proteomics experiences and interdisciplinary inspirations has provided valuable insights. While target-decoy strategies have been introduced, generating reliable decoy libraries is difficult due to metabolite complexity. Moreover, continuous bioinformatics innovation is imperative to improve the utilization of expanding spectral resources while reducing false annotations. Here, we introduce the concept of ion entropy for metabolomics and propose two entropy-based decoy generation approaches. Assessment of public databases validates ion entropy as an effective metric to quantify ion information in massive metabolomics datasets. Our entropy-based decoy strategies outperform current representative methods in metabolomics and achieve superior FDR estimation accuracy. Analysis of 46 public datasets provides instructive recommendations for practical application.
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Affiliation(s)
- Shaowei An
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
- Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang, China
- Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Miaoshan Lu
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
- Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang, China
- Zhejiang University, 866 Yuhangtang Road, Hangzhou 310009, Zhejiang, China
| | - Ruimin Wang
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
- Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang, China
- Fudan University, 220 Handan Road, Shanghai 200433, China
| | - Jinyin Wang
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
- Westlake University, 18 Shilongshan Road, Hangzhou 310024, Zhejiang, China
- Zhejiang University, 866 Yuhangtang Road, Hangzhou 310009, Zhejiang, China
| | - Hengxuan Jiang
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
| | - Cong Xie
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
| | - Junjie Tong
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
| | - Changbin Yu
- Shandong First Medical University & Central Hospital Affiliated to Shandong First Medical University, 6699 Qingdao Road, Jinan 271016, Shandong, China
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Pellissier L, Gaudry A, Vilette S, Lecoultre N, Rutz A, Allard PM, Marcourt L, Ferreira Queiroz E, Chave J, Eparvier V, Stien D, Gindro K, Wolfender JL. Comparative metabolomic study of fungal foliar endophytes and their long-lived host Astrocaryum sciophilum: a model for exploring the chemodiversity of host-microbe interactions. Front Plant Sci 2023; 14:1278745. [PMID: 38186589 PMCID: PMC10768666 DOI: 10.3389/fpls.2023.1278745] [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] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 11/28/2023] [Indexed: 01/09/2024]
Abstract
Introduction In contrast to the dynamics observed in plant/pathogen interactions, endophytic fungi have the capacity to establish enduring associations within their hosts, leading to the development of a mutually beneficial relationship that relies on specialized chemical interactions. Research indicates that the presence of endophytic fungi has the ability to significantly modify the chemical makeup of the host organism. Our hypothesis proposes the existence of a reciprocal exchange of chemical signals between plants and fungi, facilitated by specialized chemical processes that could potentially manifest within the tissues of the host. This research aimed to precisely quantify the portion of the cumulative fungal endophytic community's metabolome detectable within host leaves, and tentatively evaluate its relevance to the host-endophyte interplay. The understory palm Astrocaryum sciophilum (Miq.) Pulle was used as a interesting host plant because of its notable resilience and prolonged life cycle, in a tropical ecosystem. Method Using advanced metabolome characterization, including UHPLC-HRMS/MS and molecular networking, the study explored enriched metabolomes of both host leaves and 15 endophytic fungi. The intention was to capture a metabolomic "snapshot" of both host and endophytic community, to achieve a thorough and detailed analysis. Results and discussion This approach yielded an extended MS-based molecular network, integrating diverse metadata for identifying host- and endophyte-derived metabolites. The exploration of such data (>24000 features in positive ionization mode) enabled effective metabolome comparison, yielding insights into cultivable endophyte chemodiversity and occurrence of common metabolites between the holobiont and its fungal communities. Surprisingly, a minor subset of features overlapped between host leaf and fungal samples despite significant plant metabolome enrichment. This indicated that fungal metabolic signatures produced in vitro remain sparingly detectable in the leaf. Several classes of primary metabolites were possibly shared. Specific fungal metabolites and/or compounds of their chemical classes were only occasionally discernible in the leaf, highlighting endophytes partial contribution to the overall holobiont metabolome. To our knowledge, the metabolomic study of a plant host and its microbiome has rarely been performed in such a comprehensive manner. The general analytical strategy proposed in this paper seems well-adapted for any study in the field of microbial- or microbiome-related MS and can be applied to most host-microbe interactions.
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Affiliation(s)
- Leonie Pellissier
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Arnaud Gaudry
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Salomé Vilette
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Nicole Lecoultre
- Mycology Group, Research Department Plant Protection, Agroscope, Nyon, Switzerland
| | - Adriano Rutz
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Pierre-Marie Allard
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Laurence Marcourt
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Emerson Ferreira Queiroz
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Jérôme Chave
- Laboratoire Evolution et diversité Biologique (Unité Mixte de Recherche (UMR) 5174), Centre National de la Recherche Scientifique (CNRS), Université Toulouse III (UT3), Institut de Recherche pour le Développement (IRD), Université Toulouse 3, Toulouse, France
| | - Véronique Eparvier
- Université Paris-Saclay, Centre National de la Recherche Scientifique (CNRS), Institut de Chimie des Substances Naturelles, Gif-sur-Yvette, France
| | - Didier Stien
- Sorbonne Université, Centre National de la Recherche Scientifique (CNRS), Laboratoire de Biodiversité et Biotechnologie Microbiennes, Laboratoire de Biodiversité et Biotechnologies Microbiennes (LBBM), Observatoire Océanologique, Banyuls-Sur-Mer, France
| | - Katia Gindro
- Mycology Group, Research Department Plant Protection, Agroscope, Nyon, Switzerland
| | - Jean-Luc Wolfender
- School of Pharmaceutical Sciences, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
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Yang Q, Li B, Wang P, Xie J, Feng Y, Liu Z, Zhu F. LargeMetabo: an out-of-the-box tool for processing and analyzing large-scale metabolomic data. Brief Bioinform 2022; 23:6768054. [PMID: 36274234 DOI: 10.1093/bib/bbac455] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [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: 06/04/2022] [Revised: 09/06/2022] [Accepted: 09/24/2022] [Indexed: 12/14/2022] Open
Abstract
Large-scale metabolomics is a powerful technique that has attracted widespread attention in biomedical studies focused on identifying biomarkers and interpreting the mechanisms of complex diseases. Despite a rapid increase in the number of large-scale metabolomic studies, the analysis of metabolomic data remains a key challenge. Specifically, diverse unwanted variations and batch effects in processing many samples have a substantial impact on identifying true biological markers, and it is a daunting challenge to annotate a plethora of peaks as metabolites in untargeted mass spectrometry-based metabolomics. Therefore, the development of an out-of-the-box tool is urgently needed to realize data integration and to accurately annotate metabolites with enhanced functions. In this study, the LargeMetabo package based on R code was developed for processing and analyzing large-scale metabolomic data. This package is unique because it is capable of (1) integrating multiple analytical experiments to effectively boost the power of statistical analysis; (2) selecting the appropriate biomarker identification method by intelligent assessment for large-scale metabolic data and (3) providing metabolite annotation and enrichment analysis based on an enhanced metabolite database. The LargeMetabo package can facilitate flexibility and reproducibility in large-scale metabolomics. The package is freely available from https://github.com/LargeMetabo/LargeMetabo.
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Affiliation(s)
- Qingxia Yang
- Department of Bioinformatics, Smart Health Big Data Analysis and Location Services Engineering Lab of Jiangsu Province, School of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.,College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Bo Li
- College of Life Sciences, Chongqing Normal University, Chongqing, Chongqing 401331, China
| | - Panpan Wang
- College of Chemistry and Pharmaceutical Engineering, Huanghuai University, Zhumadian 463000, China
| | - Jicheng Xie
- Department of Bioinformatics, Smart Health Big Data Analysis and Location Services Engineering Lab of Jiangsu Province, School of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
| | - Yuhao Feng
- Department of Bioinformatics, Smart Health Big Data Analysis and Location Services Engineering Lab of Jiangsu Province, School of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
| | - Ziqiang Liu
- Department of Bioinformatics, Smart Health Big Data Analysis and Location Services Engineering Lab of Jiangsu Province, School of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
| | - Feng Zhu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China
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Mannochio-Russo H, de Almeida RF, Nunes WDG, Bueno PCP, Caraballo-Rodríguez AM, Bauermeister A, Dorrestein PC, Bolzani VS. Untargeted Metabolomics Sheds Light on the Diversity of Major Classes of Secondary Metabolites in the Malpighiaceae Botanical Family. Front Plant Sci 2022; 13:854842. [PMID: 35498703 PMCID: PMC9047359 DOI: 10.3389/fpls.2022.854842] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Accepted: 03/23/2022] [Indexed: 06/14/2023]
Abstract
Natural products produced by plants are one of the most investigated natural sources, which substantially contributed to the development of the natural products field. Even though these compounds are widely explored, the literature still lacks comprehensive investigations aiming to explore the evolution of secondary metabolites produced by plants, especially if classical methodologies are employed. The development of sensitive hyphenated techniques and computational tools for data processing has enabled the study of large datasets, being valuable assets for chemosystematic studies. Here, we describe a strategy for chemotaxonomic investigations using the Malpighiaceae botanical family as a model. Our workflow was based on MS/MS untargeted metabolomics, spectral searches, and recently described in silico classification tools, which were mapped into the latest molecular phylogeny accepted for this family. The metabolomic analysis revealed that different ionization modes and extraction protocols significantly impacted the chemical profiles, influencing the chemotaxonomic results. Spectral searches within public databases revealed several clades or genera-specific molecular families, being potential chemical markers for these taxa, while the in silico classification tools were able to expand the Malpighiaceae chemical space. The classes putatively annotated were used for ancestral character reconstructions, which recovered several classes of metabolites as homoplasies (i.e., non-exclusive) or synapomorphies (i.e., exclusive) for all sampled clades and genera. Our workflow combines several approaches to perform a comprehensive evolutionary chemical study. We expect it to be used on further chemotaxonomic investigations to expand chemical knowledge and reveal biological insights for compounds classes in different biological groups.
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Affiliation(s)
- Helena Mannochio-Russo
- NuBBE, Department of Biochemistry and Organic Chemistry, Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, San Diego, CA, United States
| | - Rafael F. de Almeida
- Royal Botanical Gardens Kew, Science, Ecosystem Stewardship, Diversity and Livelihoods, Richmond, United Kingdom
- Department of Biological Sciences, Lamol Lab, Feira de Santana State University (UEFS), Feira de Santana, Brazil
| | - Wilhan D. G. Nunes
- Federal Institute of Education, Science and Technology of Rondônia (IFRO), Ji-Paraná, Brazil
| | - Paula C. P. Bueno
- Max Planck Institute of Molecular Plant Physiology, Potsdam, Germany
- Institute of Chemistry, Federal University of Alfenas (UNIFAL), Alfenas, Brazil
| | - Andrés M. Caraballo-Rodríguez
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, San Diego, CA, United States
| | - Anelize Bauermeister
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, San Diego, CA, United States
| | - Pieter C. Dorrestein
- Collaborative Mass Spectrometry Innovation Center, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, San Diego, CA, United States
| | - Vanderlan S. Bolzani
- NuBBE, Department of Biochemistry and Organic Chemistry, Institute of Chemistry, São Paulo State University (UNESP), Araraquara, Brazil
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Fernando K, Reddy P, Spangenberg GC, Rochfort SJ, Guthridge KM. Metabolic Potential of Epichloë Endophytes for Host Grass Fungal Disease Resistance. Microorganisms 2021; 10:64. [PMID: 35056512 PMCID: PMC8781568 DOI: 10.3390/microorganisms10010064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 11/30/2021] [Revised: 12/22/2021] [Accepted: 12/24/2021] [Indexed: 12/27/2022] Open
Abstract
Asexual species of the genus Epichloë (Clavicipitaceae, Ascomycota) form endosymbiotic associations with Pooidae grasses. This association is important both ecologically and to the pasture and turf industries, as the endophytic fungi confer a multitude of benefits to their host plant that improve competitive ability and performance such as growth promotion, abiotic stress tolerance, pest deterrence and increased host disease resistance. Biotic stress tolerance conferred by the production of bioprotective metabolites has a critical role in an industry context. While the known antimammalian and insecticidal toxins are well characterized due to their impact on livestock welfare, antimicrobial metabolites are less studied. Both pasture and turf grasses are challenged by many phytopathogenic diseases that result in significant economic losses and impact livestock health. Further investigations of Epichloë endophytes as natural biocontrol agents can be conducted on strains that are safe for animals. With the additional benefits of possessing host disease resistance, these strains would increase their commercial importance. Field reports have indicated that pasture grasses associated with Epichloë endophytes are superior in resisting fungal pathogens. However, only a few antifungal compounds have been identified and chemically characterized, and these from sexual (pathogenic) Epichloë species, rather than those utilized to enhance performance in turf and pasture industries. This review provides insight into the various strategies reported in identifying antifungal activity from Epichloë endophytes and, where described, the associated antifungal metabolites responsible for the activity.
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Affiliation(s)
- Krishni Fernando
- Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (K.F.); (P.R.); (G.C.S.); (S.J.R.)
- School of Applied Systems Biology, La Trobe University, Bundoora, VIC 3083, Australia
| | - Priyanka Reddy
- Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (K.F.); (P.R.); (G.C.S.); (S.J.R.)
| | - German C. Spangenberg
- Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (K.F.); (P.R.); (G.C.S.); (S.J.R.)
- School of Applied Systems Biology, La Trobe University, Bundoora, VIC 3083, Australia
| | - Simone J. Rochfort
- Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (K.F.); (P.R.); (G.C.S.); (S.J.R.)
- School of Applied Systems Biology, La Trobe University, Bundoora, VIC 3083, Australia
| | - Kathryn M. Guthridge
- Agriculture Victoria, AgriBio, Centre for AgriBioscience, Bundoora, VIC 3083, Australia; (K.F.); (P.R.); (G.C.S.); (S.J.R.)
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Kodra D, Pousinis P, Vorkas PA, Kademoglou K, Liapikos T, Pechlivanis A, Virgiliou C, Wilson ID, Gika H, Theodoridis G. Is Current Practice Adhering to Guidelines Proposed for Metabolite Identification in LC-MS Untargeted Metabolomics? A Meta-Analysis of the Literature. J Proteome Res 2021; 21:590-598. [PMID: 34928621 DOI: 10.1021/acs.jproteome.1c00841] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metabolite identification remains a bottleneck and a still unregulated area in untargeted LC-MS metabolomics. The metabolomics research community and, in particular, the metabolomics standards initiative (MSI) proposed minimum reporting standards for metabolomics including those for reporting metabolite identification as long ago as 2007. Initially, four levels were proposed ranging from level 1 (unambiguously identified analyte) to level 4 (unidentified analyte). This scheme was expanded in 2014, by independent research groups, to give five levels of confidence. Both schemes provided guidance to the researcher and described the logical steps that had to be made to reach a confident reporting level. These guidelines have been presented and discussed extensively, becoming well-known to authors, editors, and reviewers for academic publications. Despite continuous promotion within the metabolomics community, the application of such guidelines is questionable. The scope of this meta-analysis was to systematically review the current LC-MS-based literature and effectively determine the proportion of papers following the proposed guidelines. Also, within the scope of this meta-analysis was the measurement of the actual identification levels reported in the literature, that is to find how many of the published papers really reached full metabolite identification (level 1) and how many papers did not reach this level.
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Affiliation(s)
- Dritan Kodra
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Petros Pousinis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Panagiotis A Vorkas
- Institute of Applied Biosciences at the Centre for Research and Technology Hellas (INAB
- CERTH), Thessaloniki 57001, Greece.,Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London SW7 2AZ, UK
| | - Katerina Kademoglou
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Theodoros Liapikos
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Alexandros Pechlivanis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Christina Virgiliou
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Ian D Wilson
- Computational & Systems Medicine, Department of Metabolism, Digestion and Reproduction, Imperial College London, London SW7 2AZ, U.K
| | - Helen Gika
- BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,Laboratory of Forensic Medicine and Toxicology, Medical School, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
| | - Georgios Theodoridis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece.,BIOMIC_Auth, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece.,FoodOmicsGR Research Infrastructure, AUTh node, Balkan Center, Β1.4, 10th km Thessaloniki-Thermi Rd, P.O. Box 8318, Thessaloniki 57001, Greece
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8
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Ara T, Sakurai N, Takahashi S, Waki N, Suganuma H, Aizawa K, Matsumura Y, Kawada T, Shibata D. TOMATOMET: A metabolome database consists of 7118 accurate mass values detected in mature fruits of 25 tomato cultivars. Plant Direct 2021; 5:e00318. [PMID: 33969254 PMCID: PMC8082711 DOI: 10.1002/pld3.318] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 01/18/2021] [Accepted: 03/09/2021] [Indexed: 06/02/2023]
Abstract
The total number of low-molecular-weight compounds in the plant kingdom, most of which are secondary metabolites, is hypothesized to be over one million, although only a limited number of plant compounds have been characterized. Untargeted analysis, especially using mass spectrometry (MS), has been useful for understanding the plant metabolome; however, due to the limited availability of authentic compounds for MS-based identification, the identities of most of the ion peaks detected by MS remain unknown. Accurate mass values of peaks obtained by high accuracy mass measurement and, if available, MS/MS fragmentation patterns provide abundant annotation for each peak. Here, we carried out an untargeted analysis of compounds in the mature fruit of 25 tomato cultivars using liquid chromatography-Orbitrap MS for accurate mass measurement, followed by manual curation to construct the metabolome database TOMATOMET (http://metabolites.in/tomato-fruits/). The database contains 7,118 peaks with accurate mass values, in which 1,577 ion peaks are annotated as members of a chemical group. Remarkably, 71% of the mass values are not found in the accurate masses detected previously in Arabidopsis thaliana, Medicago truncatula or Jatropha curcas, indicating significant chemical diversity among plant species that remains to be solved. Interestingly, substantial chemical diversity exists also among tomato cultivars, indicating that chemical profiling from distinct cultivars contributes towards understanding the metabolome, even in a single organ of a species, and can prioritize some desirable metabolic targets for further applications such as breeding.
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Affiliation(s)
- Takeshi Ara
- Graduate School of AgricultureKyoto UniversityUjiJapan
| | - Nozomu Sakurai
- Kazusa DNA Research InstituteKisarazuJapan
- National Institute of GeneticsMishimaJapan
| | - Shingo Takahashi
- Graduate School of AgricultureKyoto UniversityUjiJapan
- KAGOME CO., LTD.NasushiobaraJapan
| | - Naoko Waki
- Graduate School of AgricultureKyoto UniversityUjiJapan
- KAGOME CO., LTD.NasushiobaraJapan
| | | | | | | | - Teruo Kawada
- Graduate School of AgricultureKyoto UniversityUjiJapan
| | - Daisuke Shibata
- Graduate School of AgricultureKyoto UniversityUjiJapan
- Kazusa DNA Research InstituteKisarazuJapan
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9
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Lagarrigue M, Lavigne R, Guével B, Palmer A, Rondel K, Guillot L, Kobarg JH, Trede D, Pineau C. Spatial segmentation and metabolite annotation involved in sperm maturation in the rat epididymis by MALDI imaging mass spectrometry. J Mass Spectrom 2020; 55:e4633. [PMID: 33043525 DOI: 10.1002/jms.4633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 07/19/2020] [Accepted: 07/21/2020] [Indexed: 06/11/2023]
Abstract
Spermatozoa acquire their fertilizing capacity during a complex maturation process that occurs in the epididymis. This process involves a substantial molecular remodeling at the surface of the gamete. Epididymis is divided into three regions (the caput, corpus, and cauda) or into 19 intraregional segments based on histology. Most studies carried out on epididymal maturation have been performed on sperm samples or tissue extracts. Here, we used MALDI imaging mass spectrometry in the positive and negative ion modes combined with spatial segmentation and automated metabolite annotation to study the precise localization of metabolites directly in the rat epididymis. The spatial segmentation revealed that the rat epididymis could be divided into several molecular clusters different from the 19 intraregional segments. The discriminative m/z values that contributed the most to each molecular cluster were then annotated and corresponded mainly to phosphatidylcholines, sphingolipids, glycerophosphates, triacylglycerols, plasmalogens, phosphatidylethanolamines, and lysophosphatidylcholines. A substantial remodeling of lipid composition during epididymal maturation was observed. It was characterized in particular by an increase in the number of sphingolipids and plasmalogens and a decrease in the proportion of triacylglycerols annotated from caput to cauda. Ion images reveal that molecules belonging to the same family can have very different localizations along the epididymis. For some of them, annotation was confirmed by on-tissue MS/MS experiments. A 3D model of the epididymis head was reconstructed from 61 sections analyzed with a lateral resolution of 50 μm and can be used to obtain information on the localization of a given analyte in the whole volume of the tissue.
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Affiliation(s)
- Mélanie Lagarrigue
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail), UMR_S 1085, Rennes Cedex, F-35042, France
- Protim, Univ Rennes, Rennes Cedex, F-35042, France
| | - Régis Lavigne
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail), UMR_S 1085, Rennes Cedex, F-35042, France
- Protim, Univ Rennes, Rennes Cedex, F-35042, France
| | - Blandine Guével
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail), UMR_S 1085, Rennes Cedex, F-35042, France
- Protim, Univ Rennes, Rennes Cedex, F-35042, France
| | - Andrew Palmer
- Structural and Computational Biology Unit, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | - Karine Rondel
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail), UMR_S 1085, Rennes Cedex, F-35042, France
- Protim, Univ Rennes, Rennes Cedex, F-35042, France
| | | | | | | | - Charles Pineau
- Univ Rennes, Inserm, EHESP, Irset (Institut de recherche en santé, environnement et travail), UMR_S 1085, Rennes Cedex, F-35042, France
- Protim, Univ Rennes, Rennes Cedex, F-35042, France
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10
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Pezzatti J, González-Ruiz V, Boccard J, Guillarme D, Rudaz S. Evaluation of Different Tandem MS Acquisition Modes to Support Metabolite Annotation in Human Plasma Using Ultra High-Performance Liquid Chromatography High-Resolution Mass Spectrometry for Untargeted Metabolomics. Metabolites 2020; 10:metabo10110464. [PMID: 33203160 PMCID: PMC7697060 DOI: 10.3390/metabo10110464] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 09/23/2020] [Revised: 10/23/2020] [Accepted: 11/09/2020] [Indexed: 12/18/2022] Open
Abstract
Ultra-high performance liquid chromatography coupled to high-resolution mass spectrometry (UHPLC-HRMS) is a powerful and essential technique for metabolite annotation in untargeted metabolomic applications. The aim of this study was to evaluate the performance of diverse tandem MS (MS/MS) acquisition modes, i.e., all ion fragmentation (AIF) and data-dependent analysis (DDA), with and without ion mobility spectrometry (IM), to annotate metabolites in human plasma. The influence of the LC separation was also evaluated by comparing the performance of MS/MS acquisition in combination with three complementary chromatographic separation modes: reversed-phase chromatography (RPLC) and hydrophilic interaction chromatography (HILIC) with either an amide (aHILIC) or a zwitterionic (zHILIC) stationary phase. RPLC conditions were first chosen to investigate all the tandem MS modes, and we found out that DDA did not provide a significant additional amount of chemical coverage and that cleaner MS/MS spectra can be obtained by performing AIF acquisitions in combination with IM. Finally, we were able to annotate 338 unique metabolites and demonstrated that zHILIC was a powerful complementary approach to both the RPLC and aHILIC chromatographic modes. Moreover, a better analytical throughput was reached for an almost negligible loss of metabolite coverage when IM-AIF and AIF using ramped instead of fixed collision energies were used.
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Affiliation(s)
- Julian Pezzatti
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; (J.P.); (V.G.-R.); (J.B.); (D.G.)
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
| | - Víctor González-Ruiz
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; (J.P.); (V.G.-R.); (J.B.); (D.G.)
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
- Swiss Centre for Applied Human Toxicology (SCATH), 4055 Basel, Switzerland
| | - Julien Boccard
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; (J.P.); (V.G.-R.); (J.B.); (D.G.)
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
- Swiss Centre for Applied Human Toxicology (SCATH), 4055 Basel, Switzerland
| | - Davy Guillarme
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; (J.P.); (V.G.-R.); (J.B.); (D.G.)
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
| | - Serge Rudaz
- School of Pharmaceutical Sciences, University of Geneva, Rue Michel-Servet 1, 1211 Geneva 4, Switzerland; (J.P.); (V.G.-R.); (J.B.); (D.G.)
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211 Geneva 4, Switzerland
- Swiss Centre for Applied Human Toxicology (SCATH), 4055 Basel, Switzerland
- Correspondence: ; Tel.: +41-2‐2379-6572
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11
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Hassanpour N, Alden N, Menon R, Jayaraman A, Lee K, Hassoun S. Biological Filtering and Substrate Promiscuity Prediction for Annotating Untargeted Metabolomics. Metabolites 2020; 10:E160. [PMID: 32326153 PMCID: PMC7241244 DOI: 10.3390/metabo10040160] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 04/10/2020] [Accepted: 04/15/2020] [Indexed: 02/07/2023] Open
Abstract
Mass spectrometry coupled with chromatography separation techniques provides a powerful platform for untargeted metabolomics. Determining the chemical identities of detected compounds however remains a major challenge. Here, we present a novel computational workflow, termed extended metabolic model filtering (EMMF), that aims to engineer a candidate set, a listing of putative chemical identities to be used during annotation, through an extended metabolic model (EMM). An EMM includes not only canonical substrates and products of enzymes already cataloged in a database through a reference metabolic model, but also metabolites that can form due to substrate promiscuity. EMMF aims to strike a balance between discovering previously uncharacterized metabolites and the computational burden of annotation. EMMF was applied to untargeted LC-MS data collected from cultures of Chinese hamster ovary (CHO) cells and murine cecal microbiota. EMM metabolites matched, on average, to 23.92% of measured masses, providing a > 7-fold increase in the candidate set size when compared to a reference metabolic model. Many metabolites suggested by EMMF are not catalogued in PubChem. For the CHO cell, we experimentally confirmed the presence of 4-hydroxyphenyllactate, a metabolite predicted by EMMF that has not been previously documented as part of the CHO cell metabolic model.
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Affiliation(s)
- Neda Hassanpour
- Department of Computer Science, Tufts University, Medford, MA 02421, USA;
| | - Nicholas Alden
- Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02421, USA; (N.A.); (K.L.)
| | - Rani Menon
- Department of Chemical Engineering, Texas A&M, College Station, TX 77843, USA; (R.M.); (A.J.)
| | - Arul Jayaraman
- Department of Chemical Engineering, Texas A&M, College Station, TX 77843, USA; (R.M.); (A.J.)
| | - Kyongbum Lee
- Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02421, USA; (N.A.); (K.L.)
| | - Soha Hassoun
- Department of Computer Science, Tufts University, Medford, MA 02421, USA;
- Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02421, USA; (N.A.); (K.L.)
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12
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Abstract
Metabolomics has grown into one of the major approaches for systems biology studies, in part driven by developments in mass spectrometry (MS), providing high sensitivity and coverage of the metabolome at high throughput. Untargeted metabolomics allows for the investigation of metabolic phenotypes involving several hundreds to thousands of metabolites. In this approach, all signals in a mass chromatogram are processed in an unbiased way, allowing for a deeper investigation of metabolic phenotypes, but also resulting in significantly more complex data processing and post-processing steps. In this article, we discuss all the intricacies involved in extracting and analyzing metabolites by chromatography coupled to MS, as well as the processing and analysis of such datasets. © 2019 The Authors. Basic Protocol 1: Metabolite extraction for LC-MS Alternate Protocol: Methyl tert-butyl ether (MTBE) extraction for multiple mass spectrometry platforms (GC-polar, LC-polar, LC-lipid) Basic Protocol 2: LC-MS analysis Support Protocol 1: GC-MS derivatization and analysis Support Protocol 2: Lipid analysis Basic Protocol 3: LC-MS data processing Basic Protocol 4: Data analysis Basic Protocol 5: Metabolite annotation Support Protocol 3: Molecular networking using MetNet Support Protocol 4: Co-injection of authentic standards.
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Affiliation(s)
| | - Saleh Alseekh
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.,Center of Plant Systems Biology and Biotechnology (CPSBB), Plovdiv, Bulgaria
| | - Thomas Naake
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany
| | - Alisdair Fernie
- Max Planck Institute of Molecular Plant Physiology, Potsdam-Golm, Germany.,Center of Plant Systems Biology and Biotechnology (CPSBB), Plovdiv, Bulgaria
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13
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Ernst M, Kang KB, Caraballo-Rodríguez AM, Nothias LF, Wandy J, Chen C, Wang M, Rogers S, Medema MH, Dorrestein PC, van der Hooft JJJ. MolNetEnhancer: Enhanced Molecular Networks by Integrating Metabolome Mining and Annotation Tools. Metabolites 2019; 9:E144. [PMID: 31315242 DOI: 10.3390/metabo9070144] [Citation(s) in RCA: 185] [Impact Index Per Article: 37.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 07/10/2019] [Accepted: 07/11/2019] [Indexed: 12/17/2022] Open
Abstract
Metabolomics has started to embrace computational approaches for chemical interpretation of large data sets. Yet, metabolite annotation remains a key challenge. Recently, molecular networking and MS2LDA emerged as molecular mining tools that find molecular families and substructures in mass spectrometry fragmentation data. Moreover, in silico annotation tools obtain and rank candidate molecules for fragmentation spectra. Ideally, all structural information obtained and inferred from these computational tools could be combined to increase the resulting chemical insight one can obtain from a data set. However, integration is currently hampered as each tool has its own output format and efficient matching of data across these tools is lacking. Here, we introduce MolNetEnhancer, a workflow that combines the outputs from molecular networking, MS2LDA, in silico annotation tools (such as Network Annotation Propagation or DEREPLICATOR), and the automated chemical classification through ClassyFire to provide a more comprehensive chemical overview of metabolomics data whilst at the same time illuminating structural details for each fragmentation spectrum. We present examples from four plant and bacterial case studies and show how MolNetEnhancer enables the chemical annotation, visualization, and discovery of the subtle substructural diversity within molecular families. We conclude that MolNetEnhancer is a useful tool that greatly assists the metabolomics researcher in deciphering the metabolome through combination of multiple independent in silico pipelines.
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14
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Rutz A, Dounoue-Kubo M, Ollivier S, Bisson J, Bagheri M, Saesong T, Ebrahimi SN, Ingkaninan K, Wolfender JL, Allard PM. Taxonomically Informed Scoring Enhances Confidence in Natural Products Annotation. Front Plant Sci 2019; 10:1329. [PMID: 31708947 PMCID: PMC6824209 DOI: 10.3389/fpls.2019.01329] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2019] [Accepted: 09/24/2019] [Indexed: 05/11/2023]
Abstract
Mass spectrometry (MS) offers unrivalled sensitivity for the metabolite profiling of complex biological matrices encountered in natural products (NP) research. The massive and complex sets of spectral data generated by such platforms require computational approaches for their interpretation. Within such approaches, computational metabolite annotation automatically links spectral data to candidate structures via a score, which is usually established between the acquired data and experimental or theoretical spectral databases (DB). This process leads to various candidate structures for each MS features. However, at this stage, obtaining high annotation confidence level remains a challenge notably due to the extensive chemodiversity of specialized metabolomes. The design of a metascore is a way to capture complementary experimental attributes and improve the annotation process. Here, we show that integrating the taxonomic position of the biological source of the analyzed samples and candidate structures enhances confidence in metabolite annotation. A script is proposed to automatically input such information at various granularity levels (species, genus, and family) and complement the score obtained between experimental spectral data and output of available computational metabolite annotation tools (ISDB-DNP, MS-Finder, Sirius). In all cases, the consideration of the taxonomic distance allowed an efficient re-ranking of the candidate structures leading to a systematic enhancement of the recall and precision rates of the tools (1.5- to 7-fold increase in the F1 score). Our results clearly demonstrate the importance of considering taxonomic information in the process of specialized metabolites annotation. This requires to access structural data systematically documented with biological origin, both for new and previously reported NPs. In this respect, the establishment of an open structural DB of specialized metabolites and their associated metadata, particularly biological sources, is timely and critical for the NP research community.
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Affiliation(s)
- Adriano Rutz
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Miwa Dounoue-Kubo
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, Japan
| | - Simon Ollivier
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
| | - Jonathan Bisson
- Center for Natural Product Technologies, Program for Collaborative Research in the Pharmaceutical Sciences (PCRPS), University of Illinois at Chicago, Chicago, IL, United States
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Illinois at Chicago, Chicago, IL, United States
| | - Mohsen Bagheri
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- Department of Phytochemistry, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, G.C., Evin, Tehran, Iran
| | - Tongchai Saesong
- Department of Pharmaceutical Chemistry and Pharmacognosy, Faculty of Pharmaceutical Sciences and Center of Excellence for Innovation in Chemistry, Naresuan University, Phitsanulok, Thailand
| | - Samad Nejad Ebrahimi
- Department of Phytochemistry, Medicinal Plants and Drugs Research Institute, Shahid Beheshti University, G.C., Evin, Tehran, Iran
| | - Kornkanok Ingkaninan
- Department of Pharmaceutical Chemistry and Pharmacognosy, Faculty of Pharmaceutical Sciences and Center of Excellence for Innovation in Chemistry, Naresuan University, Phitsanulok, Thailand
| | - Jean-Luc Wolfender
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- *Correspondence: Jean-Luc Wolfender, ; Pierre-Marie Allard,
| | - Pierre-Marie Allard
- Institute of Pharmaceutical Sciences of Western Switzerland (ISPSO), University of Geneva, Centre Médical Universitaire (CMU), Geneva, Switzerland
- *Correspondence: Jean-Luc Wolfender, ; Pierre-Marie Allard,
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15
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Frainay C, Schymanski EL, Neumann S, Merlet B, Salek RM, Jourdan F, Yanes O. Mind the Gap: Mapping Mass Spectral Databases in Genome-Scale Metabolic Networks Reveals Poorly Covered Areas. Metabolites 2018; 8:E51. [PMID: 30223552 PMCID: PMC6161000 DOI: 10.3390/metabo8030051] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 09/06/2018] [Accepted: 09/07/2018] [Indexed: 11/23/2022] Open
Abstract
The use of mass spectrometry-based metabolomics to study human, plant and microbial biochemistry and their interactions with the environment largely depends on the ability to annotate metabolite structures by matching mass spectral features of the measured metabolites to curated spectra of reference standards. While reference databases for metabolomics now provide information for hundreds of thousands of compounds, barely 5% of these known small molecules have experimental data from pure standards. Remarkably, it is still unknown how well existing mass spectral libraries cover the biochemical landscape of prokaryotic and eukaryotic organisms. To address this issue, we have investigated the coverage of 38 genome-scale metabolic networks by public and commercial mass spectral databases, and found that on average only 40% of nodes in metabolic networks could be mapped by mass spectral information from standards. Next, we deciphered computationally which parts of the human metabolic network are poorly covered by mass spectral libraries, revealing gaps in the eicosanoids, vitamins and bile acid metabolism. Finally, our network topology analysis based on the betweenness centrality of metabolites revealed the top 20 most important metabolites that, if added to MS databases, may facilitate human metabolome characterization in the future.
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Affiliation(s)
- Clément Frainay
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, 31555 Toulouse, France.
| | - Emma L Schymanski
- Eawag: Swiss Federal Institute for Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland.
- Luxembourg Centre for Systems Biomedicine (LCSB), University of Luxembourg, 7, avenue des Hauts-Fourneaux, L-4362 Esch-sur-Alzette, Luxembourg.
| | - Steffen Neumann
- Leibniz Institute of Plant Biochemistry, Department of Stress and Developmental Biology, Weinberg 3, 06120 Halle, Germany.
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig Deutscher Platz 5e, 04103 Leipzig, Germany.
| | - Benjamin Merlet
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, 31555 Toulouse, France.
| | - Reza M Salek
- The International Agency for Research on Cancer (IARC), 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France.
| | - Fabien Jourdan
- Toxalim (Research Centre in Food Toxicology), Université de Toulouse, INRA, ENVT, INP-Purpan, UPS, 31555 Toulouse, France.
| | - Oscar Yanes
- Metabolomics Platform, IISPV, Department of Electronic Engineering, Universitat Rovira i Virgili, Avinguda Paisos Catalans 26, 43007 Tarragona, Spain.
- Spanish Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM), Monforte de Lemos 3-5, 28029 Madrid, Spain.
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16
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van der Hooft JJJ, Ridder L, Barrett MP, Burgess KEV. Enhanced acylcarnitine annotation in high-resolution mass spectrometry data: fragmentation analysis for the classification and annotation of acylcarnitines. Front Bioeng Biotechnol 2015; 3:26. [PMID: 25806366 PMCID: PMC4353373 DOI: 10.3389/fbioe.2015.00026] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [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: 11/21/2014] [Accepted: 02/19/2015] [Indexed: 11/24/2022] Open
Abstract
Metabolite annotation and identification are primary challenges in untargeted metabolomics experiments. Rigorous workflows for reliable annotation of mass features with chemical structures or compound classes are needed to enhance the power of untargeted mass spectrometry. High-resolution mass spectrometry considerably improves the confidence in assigning elemental formulas to mass features in comparison to nominal mass spectrometry, and embedding of fragmentation methods enables more reliable metabolite annotations and facilitates metabolite classification. However, the analysis of mass fragmentation spectra can be a time-consuming step and requires expert knowledge. This study demonstrates how characteristic fragmentations, specific to compound classes, can be used to systematically analyze their presence in complex biological extracts like urine that have undergone untargeted mass spectrometry combined with data dependent or targeted fragmentation. Human urine extracts were analyzed using normal phase liquid chromatography (hydrophilic interaction chromatography) coupled to an Ion Trap-Orbitrap hybrid instrument. Subsequently, mass chromatograms and collision-induced dissociation and higher-energy collisional dissociation (HCD) fragments were annotated using the freely available MAGMa software1. Acylcarnitines play a central role in energy metabolism by transporting fatty acids into the mitochondrial matrix. By filtering on a combination of a mass fragment and neutral loss designed based on the MAGMa fragment annotations, we were able to classify and annotate 50 acylcarnitines in human urine extracts, based on high-resolution mass spectrometry HCD fragmentation spectra at different energies for all of them. Of these annotated acylcarnitines, 31 are not described in HMDB yet and for only 4 annotated acylcarnitines the fragmentation spectra could be matched to reference spectra. Therefore, we conclude that the use of mass fragmentation filters within the context of untargeted metabolomics experiments is a valuable tool to enhance the annotation of small metabolites.
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Affiliation(s)
| | - Lars Ridder
- Laboratory of Biochemistry, Wageningen University and Research Centre , Wageningen , Netherlands
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