Cell line purchase: what a repository order has to carry

What an order has to establish

1. Provenance you can cite. A repository line has a catalogue identifier, a documented origin and a published characterisation, and that identifier is what a methods section cites. A line received informally has none of those, and reconstructing them later is more expensive than buying the line was.
2. Authentication, on arrival and on a schedule. Short tandem repeat profiling confirms a human line is what it claims to be, against the repository's reference profile. Do it when the line arrives, before a bank is made, and periodically afterwards. Misidentified lines are common enough in the literature that funders and journals now ask for the evidence.
3. Mycoplasma status, tested rather than assumed. Mycoplasma contamination is invisible, common, and changes cell behaviour in ways that look like biology. Test on arrival, quarantine until the result is known, and test the bank before it is used. A line that enters a shared incubator untested puts every other line in it at risk.
4. A bank made early, at a low passage. Expand and freeze a master and a working bank as soon as the line is authenticated and clean. Everything afterwards comes from the working bank at a recorded passage, which is what makes an experiment two years later comparable with one today.
5. Terms of use, read before the order. Lines carry conditions: research use only, restrictions on transfer to third parties, and sometimes obligations if the work becomes commercial. Read them at purchase rather than at the point a collaboration or a licence is being negotiated.

Choosing a panel rather than a favourite line

A single line is one genotype in one culture-adapted state, and a result in it is a result about it. Conclusions that are meant to apply to a disease need several lines spanning the molecular subtypes that matter, chosen from what is known about each rather than from what is already in the freezer.

In colorectal work, for instance, the useful spread covers the mismatch repair status and the common driver mutations rather than simply three lines that grow well. Write down which property each line in the panel represents, and the panel becomes an argument rather than a convenience.

Matched pairs and isogenic sets

Some of the most informative lines come in pairs derived from the same patient, or in isogenic sets where a single gene has been altered against an otherwise identical background. They let a difference be attributed to one variable rather than to everything that differs between two unrelated lines.

They also have to be kept as a set: if one member drifts in passage or is replaced from a different source, the comparison quietly stops being controlled. Bank both members at the same time, from the same order, and record them together.

Lines that are not what their name suggests

Several widely used lines have been shown to be cross-contaminated with, or entirely replaced by, another line, and some of those are still traded informally under the original name. Registers of misidentified lines exist and are worth checking before a line enters a project.

Others have diverged so far between laboratories that two stocks with the same name behave differently. Authentication catches the first problem and passage discipline with a documented bank limits the second; neither is optional in work that will be published.

A fibroblast cell line and a human dendritic cell line

Both phrases hide the same difficulty: the useful cell is primary and the immortalised version has lost part of what made it useful. Fibroblast lines are easy to grow and are used as feeders, transfection hosts and reprogramming starting material, with the caveat that strain and passage change their secretory behaviour. There is no dendritic cell line that presents antigen like a real dendritic cell, which is why the field uses monocyte-derived cells or a leukaemia line pushed toward the phenotype, and the differentiation protocol belongs in the method.

A cho-k1 cell line and a baf3 cell line

These are two working tools rather than models. The Chinese hamster ovary derivative is the production host behind most recombinant biologics, chosen for suspension growth, glycosylation and a regulatory history, and the subclone matters because each has its own growth and productivity behaviour. The murine pro-B line is interleukin 3 dependent, which makes it the standard vehicle for cytokine and receptor signalling assays: it dies without its cytokine, so a transfected receptor that rescues growth gives a clean readout.

An mkn45 cell line, and what to check on any tumour line

This gastric carcinoma line is used for MET-driven signalling work, and like every tumour line it comes with three obligations: authenticate it by short tandem repeat profiling against the reference, test for mycoplasma, and record the passage number with every experiment because copy number and drug response drift. Ask the repository for the karyotype and the mutation profile rather than assuming the literature's, since sublines circulating under one name differ measurably in exactly the pathways people study them for.

Common questions

Why purchase cell lines from a repository rather than a colleague?

Because the repository supplies a citable identifier, a characterised identity, a known passage and a contamination status. A line passed between laboratories carries a history nobody recorded, and reconstructing it costs more than the purchase would have.

How often should a line be authenticated?

On arrival, before a bank is made, and periodically afterwards, with the profile kept. Journals and funders increasingly ask for that evidence, and it is far easier to produce prospectively than to reconstruct.

How many lines make a panel?

Enough to span the properties your conclusion depends on, each chosen because it represents one of them. A panel assembled from what grows well is a convenience; a panel where each line stands for a stated property is an argument.

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