Scientists accidentally discover DNA that breaks the rules of life

A routine experiment reveals a microscopic pond organism with a genetic code that defies the near-universal rules of life, rewriting how genes signal their end. | Contesto: cronaca

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• Scientists accidentally discover DNA that breaks the rules of life

Contesto

In a discovery that upends fundamental assumptions about biology, scientists have identified a microscopic pond organism that breaks the near-universal genetic rules governing how life translates DNA into proteins. The finding, which emerged from a routine experiment using a new single-cell DNA sequencing method, reveals that this previously unknown protist does not use the standard "stop signal" that halts protein production in virtually all other life forms on Earth. The research team, whose work was reported by ScienceDaily, was initially conducting what they described as a standard sequencing run when they noticed something anomalous in the genetic data of the organism. Instead of following the well-established genetic code—where specific triplets of DNA bases instruct the cell to either add an amino acid or stop building a protein—this protist appears to have rewritten the very signal that tells the cellular machinery to cease translation. The discovery challenges the long-held belief that the genetic code is essentially frozen and universal across all domains of life, from bacteria to blue whales. The implications of this finding extend far beyond the pond from which the organism was sampled. For decades, molecular biology has rested on the principle that the genetic code is nearly universal, with only minor variations found in some mitochondria and a handful of single-celled organisms. This protist, however, represents a fundamental departure: it has altered the meaning of what biologists call a "stop codon," the molecular punctuation mark that ends a gene. If such flexibility exists in nature, it suggests that the evolutionary pressures shaping the genetic code may be far more dynamic than previously thought, and that other organisms may harbor similarly unconventional genetic systems. The discovery also raises profound questions about the limits of life as we know it. If a single-celled organism can rewrite one of the most conserved features of biology, then the potential for alternative genetic codes in extreme or unexplored environments—such as deep ocean vents, hypersaline lakes, or even extraterrestrial habitats—becomes a tantalizing possibility....

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Categoria: cronaca