Claude flags unusual enzyme near CRISPR-like DNA

Anthropic’s Claude identified an array-associated reverse transcriptase, or ART, in bacteriophage DNA near a gene segment resembling the CRISPR gene-editing tool. Reverse transcriptases convert RNA into DNA and can appear in viral or bacterial defense systems, but the role of this enzyme remains unclear. Anthropic CEO Dario Amodei has acknowledged that the purpose and significance of the finding are still unknown.

The computational search screened more than 200,000 candidates in bacteriophage DNA, narrowing them to 20 for further study. The run lasted 21 hours, used 950 AI agents working in parallel, and processed roughly 210 million tokens. Feng Zhang of MIT and the Broad Institute called the findings a promising sign of AI’s potential in biological research, while treating the result as an early lead rather than a confirmed breakthrough.

Anthropic says practical applications are uncertain and extensive lab work is needed before ART’s importance can be assessed. The company’s molecular biology facility is running follow-up experiments, but no timeline or confirmed use case has been provided. Even if ART proves unimportant, the search process points to a broader shift in how AI can scan biological data and generate hypotheses at scale.