Claude Finds Hidden DNA System With CRISPR-Like Features That Could Cut, Copy and Paste Genetic Material

Anthropic's Claude has discovered a previously uncharacterised enzyme system hidden in bacteriophage DNA, after AI agents searched more than 200,000 reverse transcriptases and spotted an unusual genetic pattern resembling CRISPR.

The system, named array-associated reverse transcriptases (ART), could potentially represent a new programmable biological mechanism. But scientists do not yet know exactly what it does, whether it can edit DNA or whether it will have any practical medical use.

Claude Spotted What Humans Had Missed

Anthropic announced the discovery on 23 September as the first result from its new molecular biology research group and laboratory.

Researchers initially gave Claude broad instructions to search a massive database of DNA sequences for interesting examples of reverse transcriptases, enzymes that copy RNA into DNA.

Roughly 950 Claude agents then spent around 21 hours analysing the data, using 210 million tokens. They gathered more than 200,000 reverse transcriptases, identified approximately 3,500 candidate systems, and eventually narrowed them to 20 particularly compelling candidates.

While examining one unusual reverse transcriptase family, Claude inspected the surrounding raw DNA and detected a repeating pattern beside the gene.

The AI counted the repeats, examined their spacing, compared the arrangement with known systems and searched scientific literature for previous descriptions before flagging it for human review.

Anthropic's scientists subsequently investigated the candidate in their laboratory.

Why Scientists Are Comparing It to CRISPR

ART consists of three main components: a reverse transcriptase, a neighbouring partner gene and a long array of evenly spaced DNA repeats.

That layout resembles CRISPR arrays, which helped turn a naturally occurring bacterial defence system into one of biotechnology's most important gene-editing tools.

Anthropic said the characteristics found in ART have previously appeared together in only a handful of known biological systems, all of which are programmable and perform operations such as cutting, copying or pasting DNA.

That does not mean ART itself has been shown to perform those functions.

Initial experiments found that its DNA array is expressed as distinct short RNAs, which Anthropic said suggests something analogous to other programmable systems could be occurring. Further experiments are underway to establish ART's primary function.

Could It Become Another Gene-Editing Tool?

Anthropic is cautious about the discovery's significance.

The underlying reverse transcriptase had previously been identified in a jumbo phage. What Claude appears to have discovered was the broader biological system surrounding it, including the non-coding repeat array and an additional protein with an unknown function.

Feng Zhang, an MIT professor and CRISPR genome-editing pioneer who reviewed the preprint, called the RNA-repeat arrays associated with reverse transcriptases 'genuinely intriguing' and said they merit further investigation.

The research remains early-stage, and Anthropic has released its findings as a preprint while work continues.

For scientists, the immediate significance may extend beyond whether ART eventually becomes a useful genetic tool. Claude's ability to sift through enormous genomic datasets and identify an overlooked biological pattern suggests AI could increasingly help researchers find promising discoveries hidden in data that would take humans weeks or months to analyse.

The discovery could also provide an important test of how effectively AI can contribute to future experimental research alongside human scientists.