On September 23, Anthropic announced that Claude agents found a previously uncharacterized enzyme system in bacteriophages, the viruses that infect bacteria. Anthropic scientists gave Claude one prompt: search a massive DNA sequence database for interesting reverse transcriptases, enzymes that copy RNA into DNA. About 950 agents ran for 21 hours and used 210 million tokens. The output:
• 200,000+ reverse transcriptases gathered
• 3,500 new candidate systems flagged
• 20 candidates written up as human-readable reports
One agent reading raw DNA beside an unusual enzyme spotted a tandem repeat array by eye. It counted the repeats, measured their spacing, compared the layout with known systems, and checked the literature before filing a report. Anthropic named the system Array-associated Reverse Transcriptases, or ART: the enzyme, a partner gene, and a repeat array. Lab work confirmed the array is transcribed into short RNAs.
Earlier studies had identified the enzyme; Claude was first to connect the array and partner protein. Nobody knows what ART does. The preprint has no peer review yet, and reruns struggled to reproduce the find. CRISPR pioneer Feng Zhang reviewed the preprint and said the result merits further investigation.
Anthropic says this kind of genome mining takes an expert weeks to months. Humans still run every experiment in its lab. The constraint now sits at the bench.
PCR took years to move from a new method into every teaching lab, and it needed Taq polymerase from a Yellowstone hot spring bacterium to get there. ART has 21 hours of agent time and one lab result behind it. Robots can pipette these days but so far anyways, they cannot dream up what to test next…. At least not very well.
950 agents turned a search that would take an expert months into a Tuesday afternoon, and handed a lab twenty leads worth checking.
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