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Joerg Graf
Research Professor, PBRC
Affiliated Faculty, Microbiology Graduate Program

Contact Info


Ph.D. University of Southern California
B.S. Baylor University

Curriculum Vitae

Research Interests

We study the role of the microbiome in animal health, discover antibiotic resistance producing bacteria and how biofilms develop in Hawaiian streams and fishponds. We use a range of techniques and approaches including molecular genetics, microscopy, 16S rRNA sequencing, transcriptomics, metagenomics, comparative genomics and experimental evolution to learn more about these research fields.

Department and Laboratory Webpages

Selected Publications

1.Testerman, T., J. Varga, M. M. Schiffer, H. Donohue, C. Vieira Da Silva, and J. Graf. 2023. Pseudomonas apudapuas sp. nov., Pseudomonas fontis sp. nov., Pseudomonas idahonensis sp. nov., and Pseudomonas rubra sp. nov. isolated from in, and around, a rainbow trout farm. Int. J. Syst. Evol. Microbiol. 73:006201.

2.Graf, J., N. Ledala, M. Caimano, E. Jackson, D. Gratalo, D. Fasulo, M.D. Driscoll, S. Collman, A. Matson. 2021. Tracking closely related enteric bacteria at high resolution in fecal samples of premature infants using a novel rRNA amplicon. mBio. 12:e03656-20.

3. EA McClure, EA, MC Nelson, A Lin, J Graf. 2021. Macrobdella decora: Old World Leech Gut Microbial Community Structure Conserved in a New World Leech. Appl. Env. Microbiol. 87:e02082-20.

4. Goldstein, S., L. Beka, J. Graf, J. L. Klassen. 2019. Evaluation of strategies for the assembly of diverse bacterial genomes using MinION long-read sequencing. BMC Genomics 20:23.

5. Beka, L., M. S Fullmer, S. M. Colston, M. C Nelson, E. Talagrand-Reboul, P. Walker, B. Ford, I. S. Whitaker, B. Lamy, J. P. Gogarten, and J. Graf. 2018. Low-level antimicrobials in the medicinal leech select for resistant pathogens that spread to patients. mBio 9: e01328-18. doi: 10.1128/mBio.01328-18.

6. Benjamino, J., S., Lincoln, R. Srivastava, and J. Graf. 2018. Low-abundant bacteria drive compositional changes in the gut microbiota after dietary alteration. Microbiome 6: 86.

7. Nyholm, S. and J. Graf. 2012. Knowing your friends: how invertebrate innate immunity fosters beneficial symbioses. Nat. Rev. Microbiol. 10:815-827. doi: 10.1038/nrmicro2894.

8. Bomar, L., M. Maltz, S. Colston and J. Graf. 2011. Directed culturing of microorganisms using metatranscriptomics. mBio 2(2):e00012-11. doi:10.1128/mBio.00012-11.9.

9. Silver, A.C., Y. Kikuchi, A. A. Fadl, J. Sha, A. Chopra and J. Graf. 2007. Interaction between innate immune cells and a bacterial type-three secretion system in mutualistic and pathogenic associations. Proc. Natl. Acad. Sci. USA. 104:9481-9486.

10. Graf, J. and E. G. Ruby. 1998. Host-derived amino acids support the proliferation of symbiotic bacteria. Proc. Natl. Acad. Sci. USA. 95:1818-1822.

Additional Information

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