important and puzzling events in the evolution of life has been the origin of the first complex eukaryotic cells. Almost all forms of life that we can perceive with the naked eye, such as algae, plants, animals and fungi, are made up of complex cells, known as “eukaryotes.” A collaborative study between the groups of Toni Gabaldón, ICREA researcher at the Institute for Biomedical Research (IRB Barcelona) and the Barcelona Supercomputing Center (BSC-CNS), and Berend Snel from the University of Utrecht, have concluded that the first cell to incorporate a mitochondrion (considered the key step for increasing of the complexity of eukaryotic cells) already presented a complexity similar to that of eukaryotes in structure and functions. This

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scenario serves as a bridge between the signs of Bahamas WhatsApp Number List complexity observed in some genomes of microscopic archaea organisms and the proposed role of mitochondria in triggering eukaryogenesis. “Acquisition of mitochondria was considered to be the crucial first step or the last step in the development of the complexity of eukaryotic cells,” explains Gabaldón . “Our findings show that it was indeed a crucial event, but that it happened in a setting in which cellular complexity had already increased,” he adds. Complexity as a prelude to the diversity of life For about the first half of the history of life on Earth, the only forms of life were the relatively simple cells of bacteria. “Eukaryotic cells are larger, contain more DNA and are made up of compartments, each with its

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own task,” explains the study’s first author, Julian Vosseberg . “In that sense, you could compare bacterial cells to a tent, while eukaryotic cells would look more like a house with several rooms.” How and when agencies changed the tent for a house remains a mystery, as there are no intermediate ways. An important moment in evolution was the origin of mitochondria, a component of eukaryotic cells that function as their “power plants.” Mitochondria were once free-living bacteria, but during evolution they were absorbed by the ancestors of today’s eukaryotic cells. Due to the fact that gene duplication likely drove increased cellular complexity, the researchers attempted to reconstruct evolutionary events based on these genetic changes.

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