Ingestible Breath Probes and the Gut Microbiome: Diverse Voices in Science Journalism and a Breakthrough Breath Test

Overview

In this Science podcast, two Diverse Voices in Science Journalism interns discuss their summer experiences in a fast-paced newsroom and their favorite stories, including coverage of a diarrheal disease outbreak. The episode also features researcher Leslie Chan discussing an ingestible metabolic probe that signals gut microbiome beta glucuronidase activity through breath. The technology aims to quantify enzyme activity in the gut and has implications for drug toxicity and carcinogen recycling.

Key insights

• Diverse Voices interns share newsroom experiences and health policy storytelling.
• Cyclospora cayetanensis and cyclosporiasis are explained in a patient accessible explainer.
• An ingestible breath probe converts enzyme activity in the gut into a breath signal for noninvasive readouts.
• The approach represents an emerging paradigm called induced volatile omics with broad potential in GI disease and beyond.

Episode overview

The podcast presents two Diverse Voices in Science Journalism interns who spent the summer with the AAAS Science newsroom. They discuss their time writing and learning in a high-energy environment, covering health policy stories and infectious disease outbreaks. The interviewees, Laura Ogudelo and Mona Patterson, describe how newsroom debates shaped their reporting, the adrenaline of editorial work, and how international experiences influenced their science communication. Interwoven is a feature discussion with researcher Leslie Chan about a novel ingestible metabolic probe designed to sense gut microbiome activity, specifically beta glucuronidase, a drug metabolizing enzyme that reactivates compounds in the GI tract and can contribute to toxicity when the drug is reactivated locally.

Diverse Voices interns and notable stories

Laura Ogudelo, born in Peru and trained in science journalism, describes transitioning from French media to an American newsroom. She highlights the value of real-time editing, policy reporting, and the NICHE coverage of NIH grant cuts and CDC leadership changes. Mona Patterson, a Chapman University graduate with a broadcast journalism background, emphasizes the shift to video production, newsroom collaboration, and the opportunities to cover health topics such as gut biology and nervous system regulation. They discuss specific stories from the summer, including coverage of diarrheal disease outbreaks and the challenges of tracing parasitic infections versus bacterial outbreaks.

The ingestible breath probe: how it works

Leslie Chan explains the motivation for developing a breath based readout for gut enzyme activity. The probe comprises ingestible sugar conjugates that are substrates for beta glucuronidase. When the enzyme acts, a volatile reporter is released and then travels via the bloodstream to the lungs, where it is exhaled and measured by mass spectrometry. This approach enables a noninvasive breath readout of enzyme activity in the GI tract, potentially reflecting local drug metabolism and toxicity risks.

Preclinical testing and readouts

In mice, the probe must be stable as it passes through the stomach and intestines and specifically cleaved by beta glucuronidase. The team discusses challenges such as differences between mouse and human microbiomes, the timing of gut transit, and the kinetics of breath signal emergence. The readout relies on mass spectrometry to detect the reporter, allowing researchers to quantify enzyme activity in breath within a 2 to 4 hour window after ingestion. The variability of human gut microbiomes is acknowledged, but the model is considered suitable because mice harbor beta glucuronidase expressing microbes as part of their gut ecology.

Broader implications and future directions

The beta glucuronidase activity is linked to chemotherapy GI toxicity and the recycling of carcinogens. The breath probe concept could be extended to monitor other host and microbial enzymes, enabling a panel of breath biomarkers for GI diseases and possibly other organ systems. The podcast also introduces the concept of induced volatile omics as a broader framework for noninvasive diagnostic signals. The discussion underscores the potential for translating these probes into clinical or consumer health contexts and expanding indices of gut health beyond current stool based assays.

Closing notes

The episode also touches on other Science and AAAS news items, including coverage of AI influenced misinformation and notable scientific papers in fields ranging from fMRI interpretation to lunar microbe habitat modeling, before returning to credit guests and producers.