High-Throughput Identification of Functional Regulatory Switches Involved in Human Liver Metabolism

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Summary of  Molecular Cell,  https://doi.org/10.1016/j.molcel.2026.03.036
Dr. Chadmirah Zaratiana et al.

Points

Investigators performed a high-throughput molecular analysis of 109,386 human liver-derived cis-regulatory elements to map how gene expression is controlled under real physiological conditions.
Massively parallel reporter assays under matched in vitro and in vivo conditions revealed that only a minority of the tested DNA switches are functionally active in living tissue.
The identified active regulatory elements regulate core liver pathways governing metabolism and immune responses and shift their performance based on modifications in the gut microbiome.
Microbial chemical signals and specific gut-derived metabolites directly modulated these genomic switches by partially activating the protective KEAP1/NFE2L2 cellular antioxidant pathway.
A rare genetic variation predominantly identified in East Asian populations was shown to alter individual switch sensitivity to microbial inputs, highlighting new pathways for precision diagnostics.

Summary

Designed to investigate the functional gap between cell culture models and actual physiological networks, this study systematically characterized human liver-derived cis-regulatory elements (CREs). While dynamic gene regulation in hepatocytes maintains central metabolic and immunological homeostasis, traditional functional annotations depend on in vitro frameworks that fail to capture the multi-organ chemical signaling occurring in living tissue. The research sought to determine how gut microbial communities interact with specific non-coding sequences to modulate downstream genetic transcription in hepatocytes, establishing a clearer pathophysiological mechanism for the gut-liver axis in hepatic disease development.

Utilizing high-throughput massively parallel reporter assays, the investigators profiled 109,386 human liver-derived regulatory elements under matched in vitro and in vivo conditions. The experimental data revealed that only a distinct minority of these tested sequences functioned as true in vivo-active functional CREs (fCREs), which exhibited marked enrichment for biochemical markers like H3K27ac and chromatin accessibility. Longitudinal monitoring showed that a substantial portion of these functional switches altered their baseline behavior in response to changes in the composition of the gut microbiota, operating in part via the activation of the KEAP1/NFE2L2 antioxidant signaling pathway.

Chemical signaling evaluations confirmed that specific microbe-derived metabolites directly alter transcriptional activity, and genetic variation within the fCRE regions modified their explicit responsiveness to these microbial inputs. Notably, the study highlighted a rare genetic variant predominantly found in East Asian populations that renders at least one key regulatory switch significantly more sensitive to gut-derived molecular inputs. While clinical validation trials are needed to define hazard ratios for distinct stages of chronic liver failure, these baseline findings suggest that targeting microbiota-dependent regulatory DNA elements represents a viable precision health strategy.

Link to the article: https://www.cell.com/molecular-cell/fulltext/S1097-2765(26)00232-7?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS1097276526002327%3Fshowall%3Dtrue

References

Zaratiana, C., M, Y., Lee, Y.-A., Ong, A. B. L., Liu, T. Z. Y., Low, S. M. C., Chang, S. M. S., Tan, S., Mustafa, D. N. A., Ganesh, A., Chang, X., Koh, X. Q., Tay, S. H., Lee, W. J. J., Yuan, J.-M., Khor, C. C., Koh, W.-P., Dorajoo, R., Li, Y. E., … Chen, P. B. (2026). Gut microbiota modulation of regulatory DNA elements revealed by massively parallel functional characterization. Molecular Cell, 86(9), 1708-1722.e9. https://doi.org/10.1016/j.molcel.2026.03.036