A peer-reviewed experimental study introduced microDBiT to measure host and bacterial RNA while preserving positions within mouse gut tissue. The platform connected gene activity to intestinal neighbourhoods and compared control animals with a colitis model. It provides a spatial research tool; its small animal experiments do not establish human diagnostic accuracy or establish a causal role for neighbouring bacteria in disease.
Bo Tao and colleagues developed microDBiT, a method for mapping RNA from host cells and bacteria in the same tissue section. Their peer-reviewed experimental study examines genetic activity while retaining neighbourhood information lost when a specimen is analysed as a mixture. Bacterial messenger and ribosomal RNA are captured alongside host RNA. The team tested controlled bacterial mixtures before applying the technique to mouse intestines.[1]
After tissue fixation and treatment of bacterial walls, perpendicular microfluidic channels deliver barcodes that identify positions. Measurements use 50 × 50 µm spots, which can contain multiple cells. In one experiment, three germ-free mice received a defined community of 22 human-derived bacterial members. The animals’ ileum and colon were sampled 2 weeks after colonisation. Differences in bacterial RNA production mean signal strength cannot directly provide absolute bacterial cell counts.[1]
A separate experiment compared three control mice with three male mice given chemically induced colitis. Inflamed tissue showed increased immune-related gene activity and reduced epithelial-barrier markers, alongside changes in bacterial locations and RNA profiles. The study develops a research platform: these small animal comparisons establish neither human diagnostic accuracy nor a causal role for neighbouring bacteria in disease.[1]
