Abstract
Purpose
Dengue is a mosquito vector-borne disease caused by the dengue virus, which affects 125 million people globally. The disease causes considerable morbidity. The disease, based on symptoms, is classified into three characteristic phases, which can further lead to complications in the second phase. Molecular signatures that are associated with the three phases have not been well characterized. We performed an integrated clinical and metabolomic analysis of our patient cohort and compared it with omics data from the literature to identify signatures unique to the different phases.
Methods
The dengue patients are recruited by clinicians after standard-of-care diagnostic tests and evaluation of symptoms. Blood from the patients was collected. NS1 antigen, IgM, IgG antibodies, and cytokines in serum were analyzed using ELISA. Targeted metabolomics was performed using LC–MS triple quad. The results were compared with analyzed transcriptomic data from the GEO database and metabolomic data sets from the literature.
Results
The dengue patients displayed characteristic features of the disease, including elevated NS1 levels. TNF-α was found to be elevated in all three phases compared to healthy controls. The metabolic pathways were found to be deregulated compared to healthy controls only in phases I and II of dengue patients. The pathways represent viral replication and host response mediated pathways. The major pathways include nucleotide metabolism of various amino acids and fatty acids, biotin, etc.
Conclusion
The results show elevated TNF-α and metabolites that are characteristic of viral infection and host response. IL10 and IFN-γ were not significant, consistent with the absence of any complications.
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Acknowledgements
We acknowledge Sri Sathya Sai Institute of Higher Learning (SSSIHL)- Central Research Instruments Facility (CRIF) for extending the usage of the required instrumentation facility. We thank the staff and doctors of Sri Sathya Sai Institute of Higher Medical Sciences (SSSIHMS), Whitefield, and Sri Sathya Sai General Hospital, Puttaparthi, for lending their support for the collection of blood samples from patients. We thank Kothari Distributors, Bengaluru, for providing the ELISA kits. We also thank the patient volunteers who willingly agreed to be a part of this study. We thank the Defence Research and Development Organization- Life Science Research Board (DRDO-LSRB) [O/o DG/81/48222/LSRB-337/BTB/2018], Tata Education and Development Trust [TEDT/MUM/HEA/SSSIHL/2017-2018/0069-RM-db], Prasanthi Trust, Inc., USA [22-06-2018], and the Department of Science and Technology- Technology Development Program (DST-TDP) [IDP/MED/19/2016] for providing the financial support. We also acknowledge the grant support from Department of Science and Technology- The Science and Engineering Research Board- Extra Mural Research [DST-SERB-EMR: EMR/2017/005381], Department of Science and Technology- Fund for Improvement of Science and Technology Infrastructure in Higher Educational Institutions (DST-FIST) [SR/FST/LSI-616/2014], and the University Grants Commission- Special Assistance Program (UGC-SAP III) [F.3-19 /2018/DRS-III(SAP-II)] for infrastructure funding.
Funding
Financial support was provided by Defence Research and Development Organization- LSRB [O/o DG/81/48222/LSRB-337/BTB/2018], Tata Education and Development Trust [TEDT/MUM/HEA/SSSIHL/2017–2018/0069-RM-db], Prasanthi Trust, Inc., USA [22-06-2018], DST-Technology Development Program [IDP/MED/19/2016]. We also acknowledge the grant support from Department of Department of Science and Technology-The Science and Engineering Research Board–Extra Mural Research [DST-SERB-EMR: EMR/2017/005381], Department of Science and Technology- Fund for improvement of Science and Technology Infrastructure in Higher Educational Institutions (DST-FIST) [SR/FST/LSI-616/2014], University Grants Commission-Special Assistance Program (UGC-SAP III) [F.3–19 /2018/DRS-III(SAP-II)] for infrastructure funding.
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SR carried out all the experiments, and analysis and assisted in manuscript writing and figures generation. SR and SSP helped in patient serum metabolomics sample processing and method development analysis used for the study. NSVK, RG, NB, GKM, and SK helped in collecting dengue patient and appropriate control serum samples for the study and provided clinical inputs. SKJ helped in standardizing and processing the ELISA protocols used for the study. AP helped in some of the methodology related to mass spectrometry and also with comments on the manuscript. VS and SSR conceptualized the entire idea, interpreted the results, and played a major role in the preparation of the manuscript.
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Rathnakumar, S., Kambhampati, N.S.V., Saiswaroop, R. et al. Integrated clinical and metabolomic analysis of dengue infection shows molecular signatures associated with host-pathogen interaction in different phases of the disease. Metabolomics 19, 47 (2023). https://doi.org/10.1007/s11306-023-02011-z
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DOI: https://doi.org/10.1007/s11306-023-02011-z