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Two 2026 studies describe a bacterial defense system that makes DNA in an unusual way: one enzyme copies an RNA template, while another makes a defined DNA strand without a nucleic-acid template. The finding expands what scientists know about DNA synthesis, but it does not show that a protein’s sequence is copied back into DNA or RNA—and it does not overturn biology’s central dogma.
What the discovery found
The system, called DRT3, is part of bacterial defense against bacteriophages—viruses that infect bacteria. It combines two reverse transcriptases, Drt3a and Drt3b, with a noncoding RNA. The studies describe the enzymes working together to produce alternating DNA repeats.
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The Cell study reports that Drt3a uses a 5′-ACACAC-3′ RNA template to synthesize poly-(dTdG). Drt3b makes the complementary poly-(dCdA) strand without a nucleic-acid template. The Science study likewise describes alternating poly(GT/AC) double-stranded DNA, including a protein-primed poly(AC) strand made by Drt3b. Cell study; Science study.
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| Enzyme | How it directs DNA synthesis | Reported product |
|---|---|---|
| Drt3a | Uses a noncoding RNA sequence as a template | Poly-(dTdG), reported from a 5′-ACACAC-3′ RNA template |
| Drt3b | Directs synthesis without a nucleic-acid template; the studies describe protein-primed nucleotide selection | A complementary alternating poly(AC) strand |
Drt3b’s activity is the surprising part: it can direct a specific repeating pattern in DNA without reading an RNA or DNA sequence as its template. The result is a defined repeat, not evidence that the enzyme can produce any arbitrary DNA sequence or reproduce the gene encoding a protein.
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Why this does not overturn the central dogma
The central dogma is often compressed into “DNA to RNA to protein,” which can sound like a claim that proteins cannot influence DNA synthesis in any way. The important distinction here is about information transfer: the studies show protein-directed synthesis of a particular repeat, but do not demonstrate that sequence information encoded in a protein is transferred back into nucleic acid so as to reconstruct the protein’s encoding sequence.
So “comes close” is a useful way to signal that the chemistry is unusual, not a conclusion that the central dogma has fallen. DRT3 extends what is known about how DNA can be synthesized; it does not establish protein-to-nucleic-acid sequence recovery.
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What the evidence does—and does not—establish
The Science study reports cryo-electron microscopy structures at 2.6 Å resolution. That is a measurement of structural detail, not of how common DRT3 is among bacteria or how effective it is as a defense in nature. The cited papers’ available abstracts do not establish population-level prevalence, clinical outcomes, or real-world efficacy statistics.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The finding concerns a bacterial antiphage mechanism. It is not evidence of a process in human cells or of an available medical treatment. In the Cell report, the phage-encoded RecBCD inhibitor Gam triggers DRT3-mediated abortive infection: a defense response that prevents successful phage infection rather than a treatment for disease.
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