In most cases, DNA replication stops at a stop codon, or an animo acid that codes for the stop codon. A team at Earlham Institute took samples of freshwater to collect a certain protist: Oligohymenophorea sp. The goal was simple: collect the samples, analyze the genome, and ultimately test a new DNA sequencing pipeline specialized in extremely small amounts of DNA. But for our brave scientists, fate had other plans: an undiscovered species that had a completely new take on DNA reading. The protist, somehow, reassigned the two codons typically associated with gene stopping signals had been changed to different amino acid sequences. In the specific protist, only TGA functions as a stop codon, and not TAG and TAA. Additionally, the protist had an elevated amount of TGA's, theorized to be a compensation for the repurposing of TAA and TAG. I find studies like this interesting for two reasons. One: It shows how our modern understanding of both biology and genetics is not a complete understanding, rather it is an explanation that BEST explains things. And two, it shows how science can be unpredictable, and new ideas can be found pretty much everywhere, even ponds.
Source:
https://www.sciencedaily.com/releases/2026/05/260507024045.htm
https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1010913
https://ar.inspiredpencil.com/pictures-2023/protist-cell-microscope
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