Author

Ashley Spahn

National Marrow Donor Program

Listed by name: these papers carry no ORCID for this author, so different people with the same name may be mixed together.

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Microbiology· 1

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Research Focus:clustering· 1 Research Focus:differential expression· 1 Approach:experimental assay· 1 Research Focus:gene regulatory network inference· 1 Research Focus:host-pathogen & immune response· 1 Organism:human· 1 Assay:metagenomics· 1

Frequent Co-Authors

Ami Siddharth BhattiD· 1 shared Andrew R. RezvaniiD· 1 shared Anthony Derek SungiD· 1 shared Armin RashidiiD· 1 shared Boryana DoyleiD· 1 shared Brandi BratrudeiD· 1 shared Brent R. LoganiD· 1 shared Erin F. BrooksiD· 1 shared

Activity by Year

2026-2026 · peak 1/yr

Co-Author Collaboration Network

10 top collaborators · 45 mutual co-author links

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1 shared paperMicrobiology

Ami Siddharth BhattORCID

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1 paper

Recent·Most cited

Differential effects of two common GVHD prophylaxis regimens on the gut microbiome: Results from the BMT CTN 1801 study

Jakob Wirbel, Wael Saber, Michael J. Martens, Jonathan U. Peled, Tessa M. Andermann, Teng Fei, Erin F. Brooks, Boryana Doyle, Nathan B. Pincus, Robert R. Jenq, Merav Bar, Javier Bolaños‐Meade, Brandi Bratrude, Saurabh Chhabra, Sung Won Choi, , Ami Siddharth Bhatt

This study compares the effects of two GVHD prophylaxis regimens on the gut microbiome in allo-HCT recipients and finds that while PTCy reduces microbiome diversity and bile acid metabolism, it is linked to better clinical outcomes.

bioRxiv · Feb 20, 2026 · PreprintMicrobiology