Research output per year
Research output per year
Personal profile
Biography
After degrees in Chemical Engineering & Physics, and Bioinformatics at Chalmers University of Technology, Marcus completed his PhD and postdocs at University College Cork analysing Lactobacillus genomes and age-related microbiomes. He is now an Associate Professor in Bioinformatics at School of Microbiology, UCC, researching the microbiota in inflammatory bowel disease. He currently coordinates the MSc in Bioinformatics, and recently chaired the EU COST Action ML4Microbiome to optimize and standardize machine learning in microbiome science. He has authored over 100 peer-reviewed publications, placing him among the top 0.3 most cited scientiest (Clarivate 2022), top 2% Scientists (Stanford/Elseview 2024) and top 0.1% of microbiota scientists (ScholarGPS 2025). In 2020, Marcus co-founded SeqBiome Ltd, a spin-out company providing high-quality microbiome analysis for industry and academia, where he now is the part-time Head of Bioinformatics.
Research Interests
Marcus's main research interests is the role of the gastrointestinal microbiome in inflammatory bowel diseases. He also have a particular interest in development of bioinformatics and machine learning amalysis methods of “omics” technologies for application on particularly, but not exclusively, human microbiological systems.
Teaching Activities
In addition to being Programme Director of the MSc in Bioinformatics and Computational Biology, he currently coordinates and teaches the following modules:
External positions
Head of Bioinformatics, SeqBiome Ltd.
1 Oct 2024 → …
UCC Futures (primary)
- Food, Microbiome and Health
Other research affiliations
- UCC Futures - Artificial Intelligence and Data Analytics
PhD Supervision
- Available for PhD supervision
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
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SDG 3 Good Health and Well-being -
SDG 9 Industry, Innovation, and Infrastructure
Fingerprint
Dive into the research topics where Marcus Claesson is active. These topic labels come from the works of this person. Together they form a unique fingerprint.
- 1 Similar Profiles
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Adopting omics-based approaches to facilitate the establishment of microbial consortia to generate reproducible fermented foods with desirable properties
Zhang, E., Claesson, M. J. & Cotter, P. D., 6 Feb 2026, In: npj Science of Food. 10, 1, 13 p.Research output: Contribution to journal › Review article › peer-review
Open AccessFile -
Characterizing microbiomes of African fermented foods in a global context
Leech, J., Obafemi, Y. D., Breselge, S., Aremu, T., Obadina, A. O., Itohan, M. E., Ezekiel, C. N., Parkouda, C., Tankoano, A., Traoré, K., Banwo, K., Kunadu, A.-H., Madilo, F. K., Sanni, A. I., Ogunremi, O. R., Onipede, G., Odeny, D. A., Otieno, C., Claesson, M. J. & Cotter, P. D., 5 May 2026, In: Microbiology (Reading). 172, 5, 16 p.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Functional impact of dietary chitin upon Listeria monocytogenes pathogenesis
Cazzaniga, M., Shen, P., Flegar, D., Bra, K. K., Recio, M. V., Bahey-El-Din, M., Hueston, C. M., Claesson, M., Melgar, S. & Gahan, C. G., 2026Research output: Other output › peer-review
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Impact of the defined Oligo-MM12 microbiota on intestinal colonisation and dissemination of Listeria monocytogenes
Cazzaniga, M., Bra, K. K., Herzog, M. K. M., Hardt, W.-D., Claesson, M. J., Mathur, H. & Gahan, C. G. M., 9 Mar 2026, In: Scientific Reports. 16, 1, p. 1-15 15 p., 8434.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Targeted isolation of bacteria with potential to competitively exclude Staphylococcus aureus in the upper respiratory tract of pigs
Vlasblom, A. A., Patel, S., Lawlor, P. G., Claesson, M. J., Crespo-Piazuelo, D., Eckenberger, J., Huseyin, C. E., Elend, C., Wagenaar, J. A., Zomer, A. L. & Duim, B., 8 Jan 2026, In: BMC Microbiology. 26, 1, p. 144Research output: Contribution to journal › Article › peer-review
Activities
- 1 Oral presentation
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Composition, variability, and temporal stability of the intestinal microbiota of the elderly
Claesson, M. (Speaker), Cusack, S. (Speaker), O'Sullivan, O. (Speaker), Greene-Diniz, R. (Speaker), De Weerd, H. (Speaker), Flannery, E. (Speaker), Marchesi, J. R. (Speaker), Falush, D. (Speaker), Dinan, T. (Speaker), Fitzgerald, G. (Speaker), Stanton, C. (Speaker), Van Sinderen, D. (Speaker), O'Connor, M. (Speaker), Harnedy, N. (Speaker), O'Connor, K. (Speaker), Henry, C. (Speaker), O'Mahony, D. (Speaker), AP, F. (Speaker), Shanahan, F. (Speaker), Twomey, C. (Speaker), Hill, C. (Speaker), Ross, P. (Speaker) & O'Toole, P. (Speaker)
1 Sept 2010Activity: Talk or presentation › Oral presentation
Press/Media
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Laboratory Technician required to work [...]; RECRUITMENT
18/08/23
1 item of Media coverage
Press/Media
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-University College Cork : SFI funded UCC project will enable pupil led research in air quality studies around their schools
Nyhan, M., Cryan, J. F., Wingler, A., Li, Z., O'Mahony, L., Massey, R., Venables, D. & Claesson, M.
31/05/23
2 items of Media coverage
Press/Media
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SFI funded UCC project will enable pupil led research in air quality studies around their schools
Nyhan, M., Cryan, J. F., Wingler, A., Li, Z., O'Mahony, L., Massey, R., Venables, D. & Claesson, M.
30/05/23
1 item of Media coverage
Press/Media
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University College Cork Researchers Have Published New Study Findings on Inflammatory Bowel Disease (Dietary-Induced Bacterial Metabolites Reduce Inflammation and Inflammation-Associated Cancer via Vitamin D Pathway)
Melgar, S., Claesson, M., Houston, A., Joyce, S. & Shanahan, F.
28/02/23
1 item of Media coverage
Press/Media