What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Yes—but only as a laboratory-built, semi-synthetic system. Researchers engineered Escherichia coli to maintain DNA containing an extra base pair, dNaM–dTPT3. The cells imported the unusual nucleotide triphosphates from their growth medium through an engineered transporter; they did not manufacture the added DNA letters independently.
The first milestone, reported in 2014, was propagation: the engineered bacterium copied DNA carrying the unnatural pair. A 2017 follow-up went further, showing that the extra information could be transcribed into unnatural codons and decoded during protein production. In that experiment, the system directed incorporation of natural and non-canonical amino acids into superfolder green fluorescent protein.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
|
Genetics: A Conceptual Approach | $71.34 | Buy on Amazon |
| 2 |
|
Genetics: A Conceptual Approach | $236.15 | Buy on Amazon |
| 3 |
|
Genetics For Dummies | $16.14 | Buy on Amazon |
| 4 |
|
Genetics: From Genes to Genomes, 5th edition | $140.00 | Buy on Amazon |
| 5 |
|
Thompson & Thompson Genetics and Genomics in Medicine (Thompson and Thompson Genetics in Medicine) | $68.29 | Buy on Amazon |
As an Amazon Associate I earn from qualifying purchases.
What “survives an unnatural DNA transplant” actually means
The headline describes a controlled experiment, not a wild bacterium that evolved a new genetic alphabet. Scientists built a strain of E. coli whose DNA included a fifth and sixth letter, then kept the cells growing while those letters were supplied from outside. “Survives” means the engineered cells remained viable and retained the modified genetic material under the reported laboratory conditions.
Recommended Free Tools
Natural DNA uses four bases—adenine (A), thymine (T), cytosine (C) and guanine (G). These bases pair in the familiar A–T and C–G combinations. The engineered system added the synthetic pair dNaM–dTPT3. The pair was designed to sit in DNA alongside the natural bases and carry information that the four-letter alphabet cannot represent by itself.
#1 Best Overall
That distinction matters because DNA storage, copying and biological use are separate hurdles. A cell might tolerate an artificial base long enough for a short experiment, yet fail to copy it accurately, lose it during cell division, or be unable to read it when making RNA and proteins. The two Nature milestones addressed those hurdles in sequence.
Two milestones, not one breakthrough
| Milestone | What was demonstrated | What was still required from the laboratory |
|---|---|---|
| 2014: propagation | An engineered E. coli strain maintained and copied DNA containing the unnatural base pair, in the reported plasmid-based system. | An engineered transporter and a growth medium containing the required unnatural nucleotide triphosphates. |
| 2017: information retrieval | The dNaM–dTPT3 information was transcribed into unnatural codons and decoded at the ribosome, enabling amino-acid insertion into a reporter protein. | Continued external provision of the synthetic nucleotide building blocks and the engineered cellular machinery used in the experiment. |
The 2014 paper, A semi-synthetic organism with an expanded genetic alphabet, established that DNA carrying the extra pair could be propagated in living engineered cells. It did not show that the added sequence was routinely translated into a protein.
Zhang and colleagues’ Nature paper, published on 30 November 2017 as A semi-synthetic organism that stores and retrieves increased genetic information, addressed the next step. The authors reported that their organism “both encodes and retrieves increased information” and described it as a platform for creating new life forms and functions. That statement refers to the experimental system, not to an independent organism already operating outside laboratory support.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsHow the expanded alphabet worked inside the cell
1. Synthetic nucleotides entered through a transporter
The engineered cells did not synthesize dNaM and dTPT3 from ordinary cellular metabolites. Instead, an engineered transport system moved the corresponding nucleotide triphosphates from the culture medium into the cell. This is the central qualification behind the term semi-synthetic: part of the genetic system was biological, while essential chemical inputs came from an external supply.
Nucleotide triphosphates are the activated building blocks used when DNA is copied. Providing them in the medium gave the cell access to the materials needed to maintain the extra pair. Without that supply—and without the transporter that could bring the materials across the cell boundary—the added letters would not be reliably available for replication.
Rank #2
2. DNA containing dNaM–dTPT3 was copied
In the 2014 experiment, the artificial pair was placed in DNA carried by the engineered bacterium. As the cell replicated that DNA, the system demonstrated that the unnatural pair could persist through copying rather than disappearing immediately. The result was propagation of modified genetic material, not a claim that the bacterium had evolved a self-sufficient sixth-letter genome.
Propagation is a demanding test because an altered base must remain recognizable in the copying process and must be passed on often enough to be detected in descendant cells. The reported result showed that this could be achieved in a designed laboratory strain, while the continued dependence on supplied triphosphates set a clear boundary on what had been achieved.
3. The extra sequence was transcribed into RNA information
The 2017 follow-up treated the synthetic pair as information rather than merely as a tolerated chemical modification. DNA sequences containing dNaM–dTPT3 were transcribed so that the added letters participated in the codons read by the protein-making machinery. This moved the system from genetic storage toward genetic expression.
Transcription and replication are different operations. Replication copies DNA into DNA; transcription copies a DNA template into RNA. Showing that an unnatural base could survive the first process did not guarantee that cellular transcription would handle it correctly. The later experiment supplied evidence that the added information could be carried into the RNA stage in the engineered system.
4. The ribosome decoded unnatural codons
After transcription, the resulting codons were read during translation. The reported system used those codons to direct site-specific insertion of amino acids into superfolder green fluorescent protein, a robust reporter used to reveal whether the intended genetic instruction had been followed.
Rank #3
The experiment demonstrated incorporation of both natural amino acids and non-canonical amino acids. Non-canonical amino acids are chemical building blocks outside the standard set used by ordinary proteins. Being able to place one at a chosen position gives scientists a way to alter a protein’s chemistry while retaining a DNA-encoded instruction for where the change belongs.
Why the 2017 protein result changed the significance
A DNA sequence that can be copied but not read has limited biological utility. The 2017 result showed an information pipeline: the synthetic pair could be stored in DNA, transferred into an RNA message, and interpreted at the ribosome to influence the final protein sequence. That is why the follow-up is more than a repeat of the 2014 experiment.
The reporter was superfolder green fluorescent protein, whose fluorescence provides a practical signal that a correctly folded protein was produced. The key point was not a new consumer product or a faster way to make fluorescent markers. It was proof of principle that an expanded alphabet could carry an instruction through multiple stages of gene expression.
Site-specific placement also matters. Randomly attaching an unusual chemical to a protein would not amount to an expanded genetic code. The reported approach used DNA-encoded positions, allowing the selected amino acid—whether natural or non-canonical—to be requested at a defined site in the reporter protein.
What the bacterium could not do
- It could not independently supply the new letters. The required unnatural nucleotide triphosphates came from the growth medium.
- It was not a naturally evolved organism. The strain and its transport capability were engineered by researchers.
- The first report did not establish full genetic expression. The 2014 result concerned propagation; transcription and translation were demonstrated in the later work.
- It was not a drop-in replacement for ordinary DNA. The natural A–T and C–G pairs remained part of the genome and of the cell’s normal biology.
- It was not a demonstrated commercial or consumer technology. The papers presented a platform for future experimentation, not an available product or service.
These limits are not minor footnotes. Dependence on external chemistry means the system is different from an organism that synthesizes every nucleotide it needs. It also means performance in a supplied culture medium should not be generalized to soil, water, an animal host or an uncontrolled environment.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Rank #4
How this differs from ordinary genetic engineering
Conventional genetic engineering rearranges the information available in the natural four-letter code. A gene can be copied, edited or moved between organisms, but its instructions still use A, T, C and G. The semi-synthetic system changed the alphabet itself by adding dNaM and dTPT3, then connected those letters to codons that could be interpreted during translation.
That extra capacity can be used in two distinct ways. First, it can encode more information in a sequence, potentially creating additional distinguishable instructions. Second, it can assign instructions to chemical building blocks that ordinary biology does not routinely place in proteins. The 2017 reporter experiment addressed both ideas at the proof-of-concept level by retrieving the added sequence and incorporating non-canonical amino acids.
It is useful to separate “more symbols” from “more biological functions.” An alphabet with six letters increases the possible sequence combinations, but a useful function still requires compatible copying, transcription, translation, regulation and cell physiology. The reported work connected several of those steps in one engineered system; it did not solve every engineering problem involved in building an autonomous alternative genetic code.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What applications are plausible—and what remains speculative
New protein chemistry
The most immediate scientific opportunity is the controlled production of proteins containing non-canonical amino acids. Such residues can introduce chemical groups that the standard genetic code does not normally provide. Researchers could use that capability to investigate protein structure, create molecular probes or test new catalytic functions, provided the necessary cellular machinery and chemical supplies are available.
Biological information storage
An expanded alphabet could encode more distinguishable states in DNA than the natural four-letter system. In principle, that may support denser or more complex biological records. The demonstrated experiments were about maintaining and retrieving information in living cells, not about a finished data-storage product, a benchmarked capacity claim or a practical replacement for electronic storage.
Best Value
Platforms for synthetic organisms
The 2017 authors described the semi-synthetic organism as a platform for creating new life forms and functions. That is a research direction, not evidence that a fully independent organism with a permanent alternative alphabet has already been built. Future systems would need reliable internal synthesis of the unnatural nucleotides, stable inheritance over many generations and predictable control of any new genes.
How to read claims about “unnatural DNA” accurately
When you encounter a similar headline, check four questions before drawing a conclusion:
- Was the organism engineered? In this case, yes. The strain was designed to carry the extra pair.
- Where did the synthetic nucleotides come from? They were imported from the growth medium rather than made by the cell.
- Was the DNA only copied, or was it read? The 2014 work showed propagation; the 2017 work demonstrated transcription and translation.
- What output proved decoding? The later study used superfolder green fluorescent protein and reported site-specific incorporation of natural and non-canonical amino acids.
Those questions prevent the most common overstatement: turning a chemically supported laboratory system into a self-sufficient bacterium with a naturally evolved genetic alphabet.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →The bottom line for readers
An engineered E. coli strain did maintain DNA with the synthetic dNaM–dTPT3 base pair, and a later experiment showed that the extra information could be retrieved to guide protein production. That is a genuine expansion of what a living cell can be made to store and read. It is also a qualified achievement: the cells depended on an engineered transporter and an external supply of unnatural nucleotide triphosphates. The work is best understood as a synthetic-biology platform with future potential, not as an autonomous bacterium or a technology already ready for everyday use.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
