Where custom plasmid synthesis, gene block synthesis and plasmid synthesis stop being the same order: what synthetic genes delivered as a linear fragment leave you to do, when a plasmid preparation service or plasmid preparation at scale is the thing you actually needed, how synthetic grna is ordered and stored differently from anything else on this list, and what sequence evidence and ownership terms should come with every construct so the next person does not rebuild it

Ordering the right thing

1. Decide whether you need DNA or a vector. A linear fragment is cheap and is an input to your own assembly. A finished plasmid is more expensive and arrives ready to transfect. If you have no assembly capacity or no time, the fragment is not the saving it appears to be.
2. Specify the backbone and the junctions exactly. Vector, insertion site, reading frame, tags and their positions, and the exact junction sequences. Most rework in this category is an assumed backbone or a frame shift introduced by an unstated junction.
3. Send the sequence for screening before ordering. Repeats, extreme composition and hairpins turn a routine synthesis into a long one or a refusal. Suppliers screen a draft for free, and a small redesign at that point avoids a delay measured in weeks.
4. Use a preparation service where the bottleneck is quantity. When the construct already exists and what you lack is milligrams at a stated purity, a preparation service is faster and cheaper than culturing it yourself, and it comes with a certificate you can file.
5. Handle synthetic guides as their own class. Chemically synthesised guides arrive with modifications that affect stability and immune sensing, and they are stored and resuspended differently from plasmid DNA. Order them with the modification pattern stated and keep them separate from the plasmid workflow.
6. Settle ownership and sequence evidence in the order. Ask for the full sequence as manufactured and the underlying reads, and confirm who owns the construct and any intermediates. Both are easy to agree before an order and awkward afterwards.

The construct record outlives the project

A construct that exists as a tube in a box and a name in someone's notebook will be rebuilt. A construct that exists as a sequence file, a manufacturing record and an identifier that appears on the tube will not.

Set the convention once: identifier, full sequence, source, date, person, and where the physical stock lives. The saving compounds every year the laboratory runs.

Where the money actually goes

Per base pricing suggests that length drives cost, and for easy sequences it does. For difficult ones the cost is in the attempts, the redesigns and the delay, none of which appear on the quotation until the sequence is screened.

That is why a design conversation before ordering is worth more than shopping the price. A supplier who tells you a sequence is hard is doing you a service.

Common questions

Fragment or finished plasmid?

Fragment when you are assembling several parts and have the capacity. Finished plasmid when the construct is the deliverable, when time matters, or when the sequence verification is worth outsourcing along with the build.

What should a preparation service return?

Plasmid at a stated concentration and purity, with a supercoiled fraction, an endotoxin figure where it matters, an identity check and the strain it was grown in. A tube with a concentration alone is not enough for anything downstream.

Are synthetic guides better than expressed ones?

They are faster, transient and avoid integration, which suits primary cells and delivery as a complex. Expressed guides suit stable systems and library work. The choice follows the experiment rather than a general ranking.

Why do suppliers ask about my institution?

Because sequence screening and customer verification are a routine part of ordering synthetic DNA. Providing the details promptly is the fastest route through it, and orders from a new account should be placed with time in hand.

Browse by service class

• Compare Gene synthesis on advertised prices