Science
Large-scale genome study reveals irreversible highways guiding animal evolution
A University of Vienna study mapped more than 5,800 chromosome-scale genomes, finding that chromosome evolution is restricted to specific, one-way pathways.
The short version
- Researchers analyzed 5,800 chromosome-scale genomes across 19 animal phyla to map historical genetic reorganizations.
- The study identified "evolutionary highways," finding that chromosome changes tend to follow limited, irreversible pathways rather than random variations.
- Certain lineages, such as mosquitoes, glass sponges, and earthworms, were found to occupy highly isolated positions on the genomic map due to their distinct chromosome architectures.
Key facts
- An international study led by researchers at the University of Vienna compared 5,800 chromosome-scale genomes representing 4,454 species across 19 animal phyla.[ScienceDaily]
- The findings, published in Science Advances, suggest that chromosome evolution is not random but follows a restricted set of irreversible routes the researchers call 'evolutionary highways'.[ScienceDaily]
- A primary driver of these restricted pathways is 'fusion-with-mixing,' a process where two chromosomes merge and permanently blend their genes, leaving a non-reversible genomic record.[ScienceDaily]
- The researchers developed a framework named evolutionary genome topology to place diverse animal genome structures onto a single coordinated map.[ScienceDaily]
- The study was funded in part by the European Research Council, the Austrian Science Fund, and the Rupert Riedl Prize of the Vienna Haus des Meeres Verein.[ScienceDaily]
What remains uncertain
- It remains to be investigated whether changes in chromosome structure are consistently associated with differences in gene regulation, development, or biodiversity.[ScienceDaily]
Sources
- Scientists find hidden “highways” guiding animal evolutionScienceDaily - Environment