The genetic code is usually described as an orderly language, read one letter after another in precise three-letter units.
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code → describe → units
But nature has never been particularly interested in following the rules humans use to describe it.
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humans → follow → it
Researchers at the Innovative Genomics Institute (IGI), founded by Jennifer Doudna, have now uncovered a viral system that appears to rewrite some of those assumptions.
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that → found → assumptions
Called VIPR, the system uses a previously unknown “gapped” coding strategy to recognise DNA, offering clues about the ancient origins of CRISPR and potentially opening another route to genome engineering.
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system → call → engineering
The findings were reported in two connected papers in Science in September 2026.
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findings → report → September
A mystery hidden in viral RNA
The discovery began with a search for ancient relatives of Class 1 CRISPR systems, the older and more widespread branch of CRISPR biology.
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discovery → hide → biology
Unlike the better-known Cas9 system, Class 1 systems rely on several proteins working together.
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systems → know → proteins
Researchers Peter Yoon and Kenneth Loi used AI-assisted structural analysis to screen roughly 2.3 million protein structures.
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Yoon → use → structures
Among hundreds of candidates, one stood out because its shape resembled proteins associated with ancient CRISPR systems, even though it was paired with an unfamiliar RNA rather than a recognisable CRISPR guide.
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it → stand → RNA
The RNA initially appeared almost impossible to interpret.
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RNA → appear → ?
Its sequence contained repeating patterns that conventional genetic analysis did not explain.
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analysis → contain → that
The code between the gaps
A second AI approach helped reveal the pattern.
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approach → help → pattern
The researchers found that groups of three bases repeatedly contained a predictable pair followed by a highly variable third position.
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groups → find → position
, the system appeared to skip across it, effectively creating a hidden code.
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system → appear → code
That pattern ultimately allowed the researchers to identify matching sequences in viral DNA.
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researchers → allow → DNA
The finding is unusual because genetic information is generally interpreted as a continuous sequence.
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information → interpret → sequence
VIPR instead appears to ignore positions that are more prone to mutation while concentrating on more stable parts of the genetic code.
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that → appear → code
This could give the system an advantage when targeting rapidly changing viral genomes.
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This → give → genomes
A different way to engage DNA
VIPR also behaves differently from familiar CRISPR systems.
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way → engage → systems
Rather than using a protein to cut DNA, researchers found that its RNA can wrap around the DNA double helix, forming a three-stranded structure known as a triplex.
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RNA → use → triplex
That interaction can interfere with gene activity rather than cutting the DNA itself.
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interaction → interfere → DNA
In laboratory experiments, the researchers were able to reprogram VIPR to bind near a gene's promoter and silence the gene.
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researchers → reprogram → gene
Its compact size could be useful because delivering large genome-editing machinery into cells remains a major challenge in developing practical gene-editing technologies.
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delivering → deliver → technologies
The IGI itself identifies delivery as one of the biggest barriers to broader use of CRISPR-based therapies.
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IGI → identify → therapies
A viral origin story for CRISPR
The discovery may also reshape ideas about where CRISPR came from.
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CRISPR → reshape → where
The researchers found VIPR systems in viruses that appear to use them against competing viruses, suggesting that viral competition helped shape this unusual molecular weapon.
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competition → find → weapon
Even more intriguingly, some functional VIPR systems appear to have moved into bacteria.
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systems → appear → bacteria
The researchers propose that bacteria may have acquired such viral machinery and repurposed it against viruses, potentially contributing to the evolutionary pathway that eventually produced ancient Class 1 CRISPR systems.
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that → propose → systems
For now, VIPR remains a research tool rather than an established medical technology.
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VIPR → remain → ?
But its unusual structure, tiny size and broad targeting potential give scientists another piece of the evolutionary puzzle, and another molecular system to explore as the genome-editing toolbox continues to expand.
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toolbox → give → puzzle
The Aporia
