Study Reveals Evolution Has Used the Same Genes for 120 Million Years
A study conducted by an international team of researchers, led by the University of York and the Wellcome Sanger Institute, reveals that butterflies and moths, despite their evolutionary distance, have shared the same genes responsible for warning coloration for more than 120 million years. The research suggests that evolution may follow more predictable pathways than previously believed.
Shared Genes Between Butterflies and Moths
Researchers found that two genes, known as ivory and optix, are responsible for warning coloration in seven distantly related species of butterflies and moths. Instead of altering the genes themselves, evolution acted on regulatory elements—often called “genetic switches”—that control when these genes are activated. The study showed that in butterflies, these switches were modified in similar ways across species, while in moths a genetic inversion was observed, reflecting a strategy similar to that of one butterfly group.
Evidence of Predictability in Evolution
The research suggests that evolution may be a more predictable process than previously thought. Professor Kanchon Dasmahapatra of the University of York noted that convergent evolution—where unrelated species develop similar traits—is common, but investigating its genetic basis is rare. The findings indicate that evolution may follow recurring genetic pathways, challenging the idea that it is purely random.
Importance of Warning Coloration
Warning colors play a crucial role in the survival of butterflies and moths, many of which are toxic and unpalatable to predators. Professor Joana Meier of the Wellcome Sanger Institute explained that similarity in coloration among these species is advantageous, as birds learn to associate specific color patterns with toxicity. The study shows that these patterns can evolve relatively easily due to a highly conserved genetic foundation maintained over millions of years.
Implications for Predicting Evolution
Understanding that evolution often follows established genetic pathways may help scientists predict how species will respond to environmental or climate changes. If nature tends to reuse biological solutions, forecasting future adaptations could become more feasible. The research was published in the journal PLoS Biology and is available through the publication.
These findings offer new perspectives on evolution, suggesting that the repetition of genetic patterns can enhance our understanding of evolutionary mechanisms. The study also opens the door for future research into how species adapt and survive in a constantly changing world.
Source: sciencedaily.com
