The deepest secrets of life are hidden in genes that predate our common ancestor.
In short: We trace all life back to a single ancestor from four billion years ago. But that organism was already complex, with DNA and cell membranes. To see what came before, scientists are now tracking rare, ancient genes that reveal the very first biological functions to ever emerge on Earth.
Every living thing on Earth shares a lineage tracing back to the last universal common ancestor (LUCA), which existed about four billion years ago. While LUCA was already a sophisticated organism with a DNA genome and cellular membranes, it was not the beginning of life. To understand the era before LUCA, researchers are focusing on universal paralogs—rare gene families that appear in multiple copies across nearly all modern genomes. Because these genes were duplicated before LUCA emerged, they serve as a genetic fossil record of the earliest cellular processes.
A team including Aaron Goldman, Greg Fournier, and Betül Kaçar has identified that all known universal paralogs are involved in two fundamental tasks: building proteins or transporting molecules across membranes. By reconstructing the ancient proteins produced by these ancestral genes, scientists have demonstrated that these early molecules were capable of embedding themselves into primitive membranes and interacting with protein-making machinery. This suggests that protein synthesis and membrane transport were among the earliest biological functions to evolve, providing a foundation for all subsequent life.
This research, published in Cell Genomics, highlights how modern computational tools and AI-optimized hardware are transforming our ability to study these deep evolutionary timelines. By following the history of universal paralogs, scientists hope to move beyond the limits of traditional evolutionary methods. These genes offer a unique window into the earliest cellular lineages, allowing researchers to transform the deepest mysteries of our origins into testable scientific discoveries. As these techniques advance, we gain a clearer picture of how life transitioned from pre-cellular systems into the complex, organized organisms we recognize today.
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Sources
- Summary by Intellect · source: Scientists find genes that existed before all life on Earth
- Also: First universal common ancestor
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