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Intratumoral Fusobacterium nucleatum Colonization Across Colorectal Tissue Microhabitats

#Fusobacterium #ColorectalCancer #TumorMicrobiome #16SrRNA #FISH #SpatialBiology #MicrobiomeResearch #CancerMicrobiology
Intratumoral Fusobacterium nucleatum Colonization Across Colorectal Tissue Microhabitats I am sharing a density-style visualization summarizing the spatial enrichment of Fusobacterium nucleatum in colorectal tumors relative to adjacent normal mucosa. The figure plots relative bacterial load distributions across four spatial niches, with quantification framed in terms of 16S rRNA and FISH-based approaches. Important caveat: the data displayed are simulated. They are intended to illustrate a literature-grounded trend rather than to represent any single empirical dataset. The distributions were parameterized to reflect consistently reported observations regarding F. nucleatum enrichment gradients across tumor microhabitats. The plot contrasts four niches: the luminal/surface epithelial interface, the invasive tumor front, the tumor core, and adjacent histologically normal mucosa. The density curves depict a rightward shift and heavier right tail in tumor-associated compartments, with the invasive front and tumor core exhibiting the highest modal bacterial loads. Adjacent normal mucosa shows a comparatively narrow, left-shifted distribution consistent with lower colonization density. Mechanistically, this spatial patterning aligns with FadA-mediated adhesion to E-cadherin and subsequent β-catenin signaling activation, alongside Fap2-dependent binding to Gal-GalNAc, which is overexpressed in colorectal neoplastic tissue. Fap2 engagement of TIGIT contributes to a locally immunosuppressive microenvironment, plausibly reinforcing niche-specific persistence within the tumor core and invasive margin. I would welcome methodological input regarding normalization strategies for 16S rRNA read counts versus FISH-derived per-field enumeration, particularly approaches to reconcile compositional bias with absolute spatial quantification. Comments on appropriate spatial statistics for niche-resolved microbial density are also encouraged.
August 13, 2026 at 5:05 PM