WTA2 is designed to amplify RNA from formalin-fixed, paraffin-embedded (FFPE) and other damaged or degraded samples. Here are the main differences between the two kits:
1. WTA1 was developed by Rubicon. WTA2 was developed by Sigma-Aldrich.
2. The library synthesis primers for WTA2 are different and can prime more frequently, which is crucial for degraded RNAs.
3. The library synthesis conditions are different due to the change in the primers.
4. There are improved cycling conditions in WTA2 to optimize amplification of both high AT templates and high GC templates.
5. WTA1 does not contain an amplification enzyme, which needs to be supplied separately. WTA2 includes the amplification enzyme.