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Oles RE, Terrazas MC, Loomis LR, Hsu CY, Tribelhorn C, Ferre PB, Ea A, Bryant M, Young J, Carrow HC, Sandborn WJ, Dulai P, Sivagnanam M, Pride D, Knight R, Chu H. Pangenome comparison of Bacteroides fragilis genomospecies unveil genetic diversity and ecological insights. bioRxiv 2023:2023.12.20.572674. [PMID: 38187556 PMCID: PMC10769428 DOI: 10.1101/2023.12.20.572674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Bacteroides fragilis is a Gram-negative commensal bacterium commonly found in the human colon that differentiates into two genomospecies termed division I and II. We leverage a comprehensive collection of 694 B. fragilis whole genome sequences and report differential gene abundance to further support the recent proposal that divisions I and II represent separate species. In division I strains, we identify an increased abundance of genes related to complex carbohydrate degradation, colonization, and host niche occupancy, confirming the role of division I strains as gut commensals. In contrast, division II strains display an increased prevalence of plant cell wall degradation genes and exhibit a distinct geographic distribution, primarily originating from Asian countries, suggesting dietary influences. Notably, division II strains have an increased abundance of genes linked to virulence, survival in toxic conditions, and antimicrobial resistance, consistent with a higher incidence of these strains in bloodstream infections. This study provides new evidence supporting a recent proposal for classifying divisions I and II B. fragilis strains as distinct species, and our comparative genomic analysis reveals their niche-specific roles.
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Affiliation(s)
- Renee E Oles
- Department of Pathology, University of California, San Diego, La Jolla, CA
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
| | | | - Luke R Loomis
- Department of Pathology, University of California, San Diego, La Jolla, CA
| | - Chia-Yun Hsu
- Department of Pathology, University of California, San Diego, La Jolla, CA
| | - Caitlin Tribelhorn
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
| | - Pedro Belda Ferre
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
| | - Allison Ea
- Department of Pathology, University of California, San Diego, La Jolla, CA
| | - MacKenzie Bryant
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
| | - Jocelyn Young
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
- Rady Children's Hospital, San Diego, CA, United States
| | - Hannah C Carrow
- Department of Pathology, University of California, San Diego, La Jolla, CA
| | - William J Sandborn
- Division of Gastroenterology, University of California, San Diego, La Jolla, CA
- Center for Microbiome Innovation, University of California, San Diego, La Jolla, CA
| | - Parambir Dulai
- Division of Gastroenterology, University of California, San Diego, La Jolla, CA
- Division of Gastroenterology, Northwestern University, Chicago, Illinois
| | - Mamata Sivagnanam
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
- Rady Children's Hospital, San Diego, CA, United States
| | - David Pride
- Department of Pathology, University of California, San Diego, La Jolla, CA
- Center for Microbiome Innovation, University of California, San Diego, La Jolla, CA
- Center for Innovative Phage Applications and Therapeutics (IPATH), University of California, San Diego, La Jolla, CA
- Center of Advanced Laboratory Medicine (CALM), University of California, San Diego, La Jolla, CA
| | - Rob Knight
- Department of Pediatrics, School of Medicine, University of California, La Jolla, CA
- Center for Microbiome Innovation, University of California, San Diego, La Jolla, CA
- Shu Chien-Gene Lay Department of Bioengineering, University of California San Diego, La Jolla, CA
- Department of Computer Science & Engineering, University of California, San Diego, La Jolla, CA
- Halıcıoğlu Data Science Institute, University of California, San Diego, La Jolla, CA
| | - Hiutung Chu
- Department of Pathology, University of California, San Diego, La Jolla, CA
- Center for Microbiome Innovation, University of California, San Diego, La Jolla, CA
- Chiba University-UC San Diego Center for Mucosal Immunology, Allergy and Vaccines (cMAV), University of California, San Diego, La Jolla, CA
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