Key result
Digestion boosts python myofibril tension and relaxation, driven by extensive post-translational modifications.
Why the study?
Burmese pythons exhibit cardiac remodeling during digestion, but the molecular mechanisms underlying this process are not fully understood.
In a Burmese python model of extreme cardiometabolic plasticity, digestion rapidly increases myofibril tension and relaxation rates, driven by extensive post-translational modifications rather than immediate sarcomere protein synthesis.
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“We found that the python heart is basically able to radically remodel itself, becoming much less stiff and much more energy efficient, in just 24 hours. If we can map out how the python does this and harness it to use therapeutically in people it would be extraordinary.”
“It's fascinating how pythons can modify their metabolism and contraction force, which is particularly relevant given the prevalence of cardiac metabolic disorders in humans.”
“It's interesting that they address the function of the cardiomyocytes, the cells of the heart. It's an important study because it contributes, with the use of very sophisticated techniques, an insight that we did not have before at the level of cardiomyocyte function.”
Extends models of cardiac plasticity via post-translational mechanisms under metabolic stress; leaves open translation to human cardiometabolic disease.
Burmese pythons exhibit cardiac remodeling in response to increased metabolic rate during digestion. Here, we performed single-myofibril mechanics measurements and myosin biochemical assays to evaluate the impact of feeding on the cardiomyocyte sarcomere in two experimental paradigms: normal feeding (one meal per month) and frequent feeding (eight meals per month). Myofibril tension and rate of relaxation increased during digestion in both paradigms, while frequent feeding was further associated with slower myofibril activation. To gain potential mechanistic insight, we performed multi-omics analyses. RNA sequencing identified increased relative concentration of some sarcomeric mRNAs during digestion; however, proteomics suggested a delay in sarcomere protein synthesis at the peak of remodeling, as the relative abundance of most sarcomere proteins declined. Analysis of post-translational modifications identified hundreds of sites on sarcomere proteins, including on the tension-regulating proteins titin and myosin. Our results detail the molecular underpinnings of cardiac remodeling in digesting Burmese pythons and suggest the mechanism for rapidly increasing myofibril function is a post-translational program.
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Martin et al. (2026) studied Post-prandial cardiac remodeling. Frequent feeding (eight meals per month) vs Normal feeding (one meal per month) vs. Fasted pythons (28 days post-feeding) was evaluated on Myofibril tension and kinetics of activation and relaxation. Digestion in Burmese pythons increased myofibril tension and relaxation rate, with frequent feeding further slowing myofibril activation, driven by extensive post-translational modifications.
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