Texas A&M University researchers map NF-κB transcription factor activity to provide predictive model for gene regulation

Chemical engineers at Texas A&M develop a mathematical map of how the NF-κB transcription factor binds to DNA, aiding research into cancer and inflammation.

By: AXL Media

Published: Mar 2, 2026, 6:09 AM EST

Source: The information in this article was sourced from Texas A&M University

Quantitative analysis of cellular decision making

Researchers at Texas A&M University have published a study in Science Advances that clarifies how transcription factors dictate changes in gene expression. Led by Dr. Gregory Reeves, the team focused on a protein called Dorsal, which is the embryonic version of Nuclear Factor-κB (NF-κB). This protein acts as a critical regulator for cellular processes including development, immune response, and wound healing. By interpreting the movement and binding patterns of this protein, the researchers aim to move cellular biology toward a more predictive and manipulative science.

Fluctuation spectroscopy and molecular movement

The research team employed fluctuation spectroscopy to distinguish between the different physical states of the Dorsal protein inside the cell nucleus. This method allowed them to categorize molecules based on their mobility: those moving quickly, those moving slowly, and those that are entirely stationary. By identifying these states, the team could determine which molecules were freely floating and which were actively bound to DNA or clumped together. This nucleus-wide view provides a comprehensive look at the mechanical connection between transcription factors and genetic instruction.

Non-linear relationships in DNA binding

A key finding of the study is that the relationship between the total amount of NF-κB in the nucleus and the amount actually performing its job on the DNA is not linear. In evaluating different parts of embryos, the team discovered that while the amount of free moving Dorsal remains relatively constant, the amount bound to DNA varies significantly. This discovery suggests that gene regulation is controlled by specific thresholds and complex binding dynamics rather than a simple one-to-one ratio of protein concentration.