When you work with synthetic DNA, a lot of care goes into the sequences you design and assemble for a variety of applications. But what happens when you’ve got your sequences ready and it’s time to place an order? Unfortunately, too many scientists simply turn to the vendor promising the cheapest results, or the vendor they’ve heard about most often. There’s a lot more to delivering reliable, high-quality DNA.
Next time you’re ready to order DNA, it’s worth doing a little extra research to consider a broader set of factors before committing to a vendor. That technology selection can mean the difference between a successful project that runs on time and generates reliable results, versus a project plagued by delays or unexpected results caused by receiving incorrect sequences.
Features to Look for When Selecting a DNA Synthesis Vendor
In addition to turnaround times and sequence quality, the measure of a DNA synthesis vendor lies in the features and safeguards they provide. By evaluating the aspects of DNA synthesis services, you can ensure your research progresses more smoothly.
Time to Receive Complete Order
It may seem so obvious that it’s not worth pointing out: you need to know when you’ll have your DNA so you can plan, schedule, and execute experiments. But in the world of synthetic DNA, turnaround time is anything but straightforward.
Many synthesis vendors parcel out sequences a bit at a time. Typically, the gene sequences that are easiest to manufacture are synthesized first, and shipped within the promised delivery window. Slightly more difficult synthesized sequences may take a few weeks to build, usually extending past the stated delivery time due to manufacturing failures and retries. The really challenging sequences can stymie manufacturers who attempt to make them, adding several weeks or even months to the delivery period — and, ultimately, vendors may report that the sequences cannot be synthesized and cancel that part of the order.
Responsible vendors should be able to let customers know not only how long it will take for the first sequences to ship, but also whether they expect to be able to deliver all sequences in the order in that time. Equally important is mapping out your own project requirements: if your design involves longer fragments, a vendor equipped to handle long contiguous oligos and complex builds will be more reliable than one optimized only for short, simple fragments.
Complexity
There is nothing that quashes a research plan as quickly as the “complexity” filters in the gene synthesis ordering process. Any scientist who has ever ordered synthetic DNA has probably seen sequences get rejected upon input and has had to redesign sequences to meet manufacturers’ requirements. Elements that often raise the complexity alarm include repeats, regions of high or low GC content, homopolymers, and structural motifs known to form secondary structures such as hairpins (inverted repeats) or G-quadruplexes.
Natural genomes are littered with such sequences, and the longer a desired DNA sequence is, the more likely it is to contain some feature that will be considered too complex to synthesize. But long, complex DNA is necessary for the advancement of science and medicine.
Some enzymatic DNA technology is capable of reliably synthesizing complex elements, for the first time enabling access to a much broader design space. One key component is the length of starting oligos: vendors that can produce contiguous oligos hundreds of bases long will be able to deliver more complex DNA sequences because they’ll require fewer assembly points, reducing opportunities for failure.
Quality Control
As scientists need longer and more complex DNA sequences for numerous synthetic DNA applications, quality control is becoming a bigger consideration in the choice of vendor. Researchers deserve more comprehensive information and assurance that the sequences they receive are, in fact, the ones they ordered.
The short-read gene sequencers often used for quality control may not hold up for longer DNA products, or for sequences that include repetitive DNA, extreme GC content, and certain structural elements. Alternatives such as Sanger sequencing or gel electrophoresis lack the precision needed for base-by-base quality control. Instead, long-read sequencing is the most effective option for accurately representing long or complex DNA. To gain confidence in vendor quality claims, it’s worth reviewing case studies, testimonials, or independent references, which can reveal how well a provider has handled challenging projects in practice.
Cost
It’s easy to focus on per-base cost, but a real understanding of the cost of a research project goes beyond that. Customers should also consider predicted costs against the chance that there will be a delay, or that not all sequences will be delivered. If a project can’t run without all 12 sequences, but only 10 are ultimately delivered on time or at all, then even the cheapest price-per-base can become a waste of money. And even if the complete set of sequences is ultimately delivered after a delay, what is the cost of the team’s lost time?
Made in the USA
Depending on the scientist’s institution and research application, the source of synthetic DNA may be an important consideration. For example, some companies may not want key sequence designs to be sent across borders in order to protect intellectual property. In the United States, some federal funding sources or biosecurity-related applications might require that DNA be sourced domestically. In addition, increasing use of tariffs between the U.S. and other countries could raise the price of synthetic DNA built elsewhere for use in the U.S.
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Making the Right Choice for Your Research
Selecting a DNA synthesis vendor isn’t just about finding the lowest cost per base; it’s about ensuring your project stays on track, your designs remain protected, and your results are reliable. By weighing factors like turnaround time, sequence complexity, quality control, cost, and vendor credibility, researchers can partner with providers who support their science rather than slow it down. The right choice will give you more than DNA; it will give you confidence, efficiency, and peace of mind as you move from design to discovery.At Ansa, we believe that customers deserve a significantly better experience when ordering and receiving synthetic DNA.
To learn more, download this free buyer’s guide.