• Rapid generation and validation of three distinct and highly specific Affimer binders to Zika virus within just thirteen weeks of receiving the virus target.
• The Affimer reagents bind a protein called NS1 which is diagnostic of the early, acute stage of Zika infection and for which no validated antibody is available.
• Highlights the potential of Affimer technology to support global rapid response for novel point-of-care diagnostics and health screening.
Avacta has announced it has identified three Affimer proteins capable of binding to a recombinant form of a secreted Zika virus NS1 protein (Non-Structural protein 1), which is diagnostic of Zika virus infection at the early, acute stage. These Affimer binders were identified and characterised within just thirteen weeks of receiving the virus target and have the potential to be developed into new rapid point-of-care diagnostic tests for Zika infection.
The three Affimer binders are highly specific to the Zika NS1 protein and can differentiate in human serum from five other closely related viruses that give similar symptoms: Dengue, Yellow Fever, West Nile, and Japanese and Tick-borne Encephalitis. Since these viruses are very similar, there is currently no validated antibody that detects Zika virus specifically, which is a limiting factor in the development of a reliable, quick diagnostic test.
The ability to rapidly generate new diagnostic reagents in response to outbreaks of infectious agents is critical to meeting an urgent medical need, as recently evidenced by the SARS and Ebola virus outbreaks. The very high specificity of Avacta’s Affimer technology, together with the speed with which new Affimer binders can be identified and characterised, makes the technology ideal for rapidly responding to the need for detection and monitoring of new outbreaks.
The Group intends to commercialise Affimer based rapid diagnostics through co-development and licensing to third party diagnostics developers an example of which is Mologic, a UK rapid diagnostics developer, with whom a research and product development collaboration was recently announced.
Dr Alastair Smith, Chief Executive Officer, Avacta, said: “Avacta’s Affimer technology offers a distinct advantage over antibodies in infectious disease diagnostics in terms of both rapid development times and specificity. The identification of these three Affimer binders means that new diagnostic tests could be developed that have the potential to diagnose a Zika infection from its early stages, and would be suitable for low cost, rapid point-of-care diagnostics that could be deployed widely in the field or at US transport hubs for example.
At the half year we set out three initial strategic priorities for the Affimer technology, outside of therapeutic applications, in which we believe that the technology has key competitive advantages. Rapid diagnostics is one of those strategic priorities and the news that we have been able to generate highly specific Affimer binders to a significant emerging health threat in such a short space of time is strong validation of those advantages.
The success of this work shows that the Affimer technology is a platform that can be applied more broadly to generate highly specific binders rapidly. We continue to execute our strategy of developing Affimer reagents for third party products as well as developing our in-house therapeutics pipeline focused on immuno-oncology. I look forward to the next opportunity to update the market.”