We have demonstrated exceptional specificity for comparative capture of double and single base-pair mismatched DNA sequences, with very high ratio of target to non-target, superior to competing technologies such as PCR & CRISPR diagnostics in the same space. This is very important in discriminating variants of a virus, which may vary by a single mutation (single base-mismatch).
We recently published Keychain PNAs for HIV:
https://doi.org/10.1002/bip.23481(opens in new window). KeyChain PNA offers a purely synthetic alternative to biotinylation; it is reversible, tuneable, and programmable. KeyChain PNA will enable users to both multiplex and simplify sample preparation applications in ways which are not currently possible. This technology was developed and patented during the EASIVRAL project, by Altratech in conjunction with Dr Dan Appella in the NIH.
Overall assay end-to-end linearity of the “capacitance-versus-RNA” readout from our CMOS semiconductor sensor is excellent. This very linear response demonstrated in EASIVIRAL offers the potential of superior resolution to PCR. This will be important for future comparative testing and gene-expression studies.
We have demonstrated wafer-level PNA functionalisation of our CMOS semiconductor chips which together with the use of standard digital CMOS makes our technology easily scalable to high volume and moderate cost. The PNA, beads, and CMOS sensor in our assay are all synthetic components. Therefore there is no requirement for cold-chain storage and refrigeration.
Finally, KeyChain PNA allows core components such as magnetic microparticles, high capacitance R beads and CMOS chips to be functionalised in such a way that these do not need to be altered in any way to allow realised products to be used with future emerging viral variants. Rather, infusion with the relevant novel KeyChain PNA probes renders the technology suitable for use with the novel virus very rapidly.
This technology will have major societal benefits. It will be smaller, cheaper, and much simpler to use, enabling rapid viral detection and quantification by anyone in any place, from any sample. This will reduce the burden on healthcare system resources; will radically change the accessibility of high content genetic data; and facilitate rapid pandemic monitoring and intervention by governments and health agencies.