TA and GC Cloning

Learn how to simulate TA and GC cloning in SnapGene, with this video series.

TA and GC Cloning in SnapGene

INSIDE THE VIDEO

TA and GC cloning are two simple techniques that do not require restriction enzymes. This video will show you how to simulate these cloning techniques in SnapGene.

LENGTH

5 minutes

Common Questions About Using SnapGene

What is the difference between TA cloning and GC cloning in SnapGene?

TA cloning uses the 3' adenine overhang added by Taq polymerase's terminal transferase activity to ligate a PCR product into a vector with complementary T overhangs. GC cloning works on the same principle but uses a cytosine overhang, making it compatible with proofreading polymerases that generate blunt-ended PCR products. Both are simulated via Actions → TA or GC Cloning in SnapGene.

Does SnapGene include TA and GC cloning vector sequences?

Yes. SnapGene provides a list of commercial linearised vectors suitable for TA and GC cloning. You can also load a custom linearised vector from your own sequence files if the vector you need is not in the list.

What happens if I use a high-fidelity polymerase that generates blunt-ended PCR products for TA cloning?

If you specify a blunt-end polymerase, SnapGene will prompt you to simulate the addition of 3' A overhangs post-PCR using the Edit DNA Ends tool before proceeding with the TA cloning simulation. This reflects the A-tailing step required in the lab when using proofreading polymerases.

How does SnapGene handle the non-directional nature of TA cloning?

TA cloning is non-directional. SnapGene always displays a warning to flag this. You can generate a second product file showing the insert in the reverse (flipped) orientation, so both possible ligation outcomes can be simulated and assessed before bench work.

Can SnapGene automatically design PCR primers for TA or GC cloning?

Yes. In the Product tab, clicking Choose PCR Primers lets you set a target Tm. SnapGene designs appropriate primers for amplifying the insert from your source sequence. Primer names can be edited before export for ordering.

What is the difference between this simulation series and the Simulate TOPO™ Cloning series?

Both methods clone PCR products without restriction enzymes, but they use different mechanisms. TA and GC cloning use terminal overhang compatibility between PCR products and linearised vectors. TOPO™ cloning uses topoisomerase I covalently linked to the vector ends to ligate the insert. Each series covers its respective mechanism and simulation workflow in SnapGene.