Heart cell DNA is exquisitely sensitive to one protein
A small shift in the amount of a single protein can reshape how heart cells organise their DNA. New research shows this may be a key mechanism behind inherited heart disease.
Researchers published in Science a study examining how the three-dimensional DNA folding pattern in human heart cells responds to changes in the levels of a specific transcription factor, a protein that controls which genes are read. The factor in question is linked to inherited heart disease.
The study demonstrates that the effect is dose-dependent: higher or lower amounts of this protein lead to measurable shifts in how DNA is folded inside the nucleus of heart cells. Those shifts in turn determine which genes are active. This is not a mutation that directly disables a protein, but a subtler change in the three-dimensional organisation of the genome.
Chromatin folding as a risk factor
Chromatin is the combination of DNA and the proteins around which it wraps. How chromatin is organised controls how accessible genes are. When a transcription factor disrupts chromatin organisation, genes that are normally silent can become active, and vice versa. In heart disease, this can lead to abnormal cell growth or disrupted heart function.
What makes the study notable is its use of human material modelled in three dimensions at the cellular level, rather than animal models or flat cell cultures. That makes the findings more directly relevant to understanding human heart disease.
Implications for the aging heart
From a longevity perspective, this is relevant because chromatin organisation also shifts during normal aging of heart cells. Understanding how a single protein in exactly the right quantity keeps heart function stable may offer a starting point for therapies that address the genetic vulnerability of the aging heart. The authors stress that their findings provide mechanistic insight, not a direct treatment option.
Search terms to explore further: chromatin organisation heart disease | transcription factor dose response | 3D genome structure cardiomyocytes