A field study led by scientists at Singapore’s A*STAR Genome Institute (A*STAR GIS) has revealed how the gut microbiome can influence gene activity in the liver by acting on short pieces of regulatory DNA that act like molecular “switches.” By testing the activity of more than 100,000 human DNA switches related to liver biology and comparing the results of both in vitro and in vivo approaches, the research team determined which switches operate under real physiological conditions and how microbial signals alter their activity. This provides a clearer biological basis for how gut bacteria shape liver function and provides new avenues for precise diagnosis and targeted therapy of liver diseases. The survey results are molecular cell.
The liver plays a central role in metabolism and immune regulation, and there is growing evidence linking gut microbial imbalance and liver disease. Gut microbial imbalances are associated with liver disease, but the pathways linking intestinal signals and liver gene regulation remain unclear.
A key challenge is that genes are not controlled solely by their own sequences. They are heavily influenced by nearby regulatory elements, often called DNA switches, that determine when genes are used and how strongly they are expressed. Determining which of these switches are actually active in biological tissues is important for accurately identifying practical drug targets.
To determine this, the researchers conducted a high-throughput assessment of more than 100,000 human regulatory DNA elements related to liver biology. These DNA elements were obtained from publicly available international research datasets.
The study found that only a minority of the DNA switches tested were active in living liver tissue, and that these active switches were primarily associated with genes involved in metabolism and immune responses, important pathways involved in liver disease and therapeutic intervention.
Importantly, a significant portion of these bioactive switches responded to changes in the gut microbiota. As the microbial community changed, the activity of specific DNA switches also changed, and so did the expression of the genes those switches controlled.
The researchers also demonstrated that certain microbe-derived molecules can directly influence the operation of some switches, strengthening the evidence that gut bacteria can influence liver gene regulation through chemical signaling.
Additionally, the research team identified a rare genetic variation found primarily in East Asian populations that makes at least one regulatory switch more sensitive to microbial inputs, highlighting how genetic differences can shape an individual’s response to the microbiome, making it an important consideration for precision health approaches.
This study strengthens the evidence behind the gut-liver link in disease by showing that microbial signals can act through specific DNA “switches” in living liver tissue. The findings may also have practical implications for precision medicine and therapeutic development through:
- Improved target selection: Identifying DNA switches that function in living liver tissue will improve the way drug targets are selected, allowing research to move more quickly toward treatments that are more likely to be successful for patients.
- Patient stratification: Genetic differences that alter susceptibility to microbial signals help explain why people with the same risk factors experience different disease courses and respond differently to treatment.
- New therapeutic opportunities: The findings may inform future strategies for liver disease management that incorporate gut-focused approaches, potentially expanding treatment options beyond traditional treatments.
We are excited to see how these findings can support the development of microbiome-based biomarkers and therapeutic strategies and guide gut-targeted or gene-modulatory interventions to prevent or ameliorate cases of liver disease. ”
Dr. Benson Chen, A*STAR GIS Principal Scientist
“This study strengthens the scientific foundation for understanding liver health from a systemic perspective,” said Dr. Wan Yue, Executive Director of A*STAR GIS. “Identifying functional regulatory switches in living tissues provides the research community with a more reliable framework for discovering targets and developing precise interventions.”
The research team is now focused on identifying microbial and genetic markers that can work with clinical partners to translate these findings into patient-relevant insights and support a more personalized approach to liver disease.
sauce:
Singapore Agency for Science, Technology and Research (A*STAR)
Reference magazines:
Zaratyana, C. Others. (2026). The regulation of the gut microbiota of DNA regulatory elements was revealed by extensive parallel functional characterization. molecular cell. https://www.cell.com/molecular-cell/fulltext/S1097-2765(26)00232-7
