Research Daily Summary: What Happened on October 29, 2026

A tumor atlas finds age-linked differences in colorectal cancer

Researchers built a single-nucleus RNA-sequencing atlas of 189 primary colorectal tumors, including 54 from patients with early-onset disease and 135 from patients with average-onset disease.1 Among microsatellite-stable tumors, those from younger patients had more stromal cells and fewer epithelial cells, a pattern confirmed in an external cohort of 712 tumors.1

Epithelial cells from younger patients showed higher expression of long noncoding RNAs and FN1, alongside a trend toward greater variation in copy-number alterations.1 In left-sided microsatellite-stable tumors, researchers found more cell-to-cell interactions, including stronger signaling associated with epithelial-to-mesenchymal transition, a process linked to changes in cell behavior.1

Food-responsive gut bacteria affect nutrient handling in mice

Gut bacteria can sense eating and signal intestinal cells to absorb nutrients, Carnegie Mellon University researchers found.3 The bacteria break down phytate, found in foods such as nuts, seeds and grains, into molecules that activate a protein in intestinal cells and switch on nutrient-absorption genes.3

In mice eating high-calorie diets, bacteria that activated this pathway promoted fat accumulation.3 In animals on nutrient-poor diets, the bacteria and their molecules improved growth and helped them obtain more nutrients from limited food.3

Researcher Zheng Kuang said the team plans to study whether increasing these bacteria could improve nutrition and support healthy growth in food-insecure populations.3

A feedback controller adjusts blood-flow treatment after spinal injury

Researchers developed a controller that uses real-time ultrasound measurements of spinal cord blood flow to adjust norepinephrine infusion after injury.4 In rodents, the controller kept blood flow closer to target and reduced its variability compared with constant dosing. In a survival experiment, treated animals also showed functional recovery.4

The team also implemented the approach in pigs, measuring blood flow with ultrasound and near-infrared spectroscopy.4 Clinical management commonly aims to raise mean arterial pressure to 85–90 mm Hg for seven days after acute spinal cord injury, using drugs such as norepinephrine.4 The authors said the strategy could support translation to clinical care.4

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