Heart evolution mapped: shared cellular roots across species

Published in Science, the study combined spatial resolution (which cell sits where in the tissue) with gene activity data for each individual cell. This produced a cell-type atlas capturing the evolutionary history of the heart. The researchers analysed cardiac tissue from animals with very different circulatory systems, from primitive molluscs to mammals.

Shared blueprint despite millions of years of evolution

Despite large differences in shape and function, certain cell types and the genes that control them turned out to be strongly conserved across species. The researchers describe a shared evolutionary blueprint for the heart at the cellular level, tracing back to early ancestors of modern animals hundreds of millions of years ago.

This has implications for how we evaluate animal models. If the cellular architecture of the heart in mice and humans aligns at a fundamental level, findings from mouse studies may translate better than previously assumed. But the atlas also shows where evolution diverged, clarifying the limits of such comparisons.

Connection to cardiac aging

Cell types conserved across millions of years of evolution are likely critical for basic cardiac function. If those same cells are vulnerable to aging, as research on heart failure in older age suggests, then an evolutionary atlas like this provides a framework for understanding why hearts fail with age. This is an indirect connection: the study is about evolution, not aging. But for longevity researchers, the atlas offers a richer picture of which cardiac cells most warrant protection.

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