Steering Before Selection: Energy-Limited Developmental Control as a Phenotypic Capacitor, a Pre-Specified Simulation Study
Living systems meet environmental change at several speeds: fast physiological control during development, slower learned memory, and genetic change through selection. We asked whether developmental control, which we interpret as bioelectric and which carries a continuous energy cost, steers evolution, and we report what survived twenty-two versions of individual-based simulation, pre-specified…
In a groundbreaking study, researchers explored the concept of energy-limited developmental control as a "phenotypic capacitor" that steers evolution. The study, consisting of twenty-two versions of individual-based simulations, was pre-specified starting from version 11 and yielded consistent results. When faced with a permanent environmental change, the system's sensing mechanism absorbed the change within around 25 generations.
Afterward, genes took over through selection alone, taking between 340 to 450 generations to adapt in every simulation seed.
Interestingly, the developmental control did not direct genetic change; instead, it concealed genetic variation from selection. This control mechanism hid three to six times more harmful load than when there was no control. Energy scarcity released this hidden load, with brief release outperforming prolonged release. However, release only helped when control re-locked around the new form.
The net value of release is mainly determined by whether the hidden harmful load is kept in check. Without reversing harmful mutations, the value of release became a cost at 500 individuals, with a mean fitness of 0.103 as compared to 0.122 without control. Conversely, with reversal, release became a benefit across population sizes ranging from 250 to 4,000, with mean fitness levels of 0.632 against 0.489 at a population size of 2,000.
To further validate these findings, the researchers conducted a separate test that separated the factors. They found that population size alone did not reverse the outcome, and the cost lay in the concealment itself. Upon release, part of the cost was recovered. While the models used in this study are abstract and do not involve voltages or channels, the bioelectric reading is an interpretation of the results.
Importantly, all findings are based on model results, and the researchers outlined predictions for future testing of these claims in developing embryos.
Written by urgent.news from bioRxiv's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
