Evolution is traditionally associated with a process of increasing complexity and gaining new genes. However, the explosion of the genomic era shows that gene loss and simplification is a much more frequent process in the evolution of species than previously thought, and may favor new biological adaptations that facilitate the survival of living organisms. This evolutionary driver, which seems counter-intuitive -- 'less is more' in genetic terms -- now reveals a surprising dimension that responds to the new evolutionary concept of 'less, but more', i.e. the phenomenon of massive gene losses followed by large expansions through gene duplications.
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