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| Author(s): |
Marlous Vinicius Gomes Lana
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD) |
| Defense date: | 2016-01-26 |
| Examining board members: |
Bryan Eric Strauss;
Luisa Lina Villa
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| Advisor: | Bryan Eric Strauss |
| Abstract | |
Adenovirus (ad) is an etiologic agent that causes infections in diverse species and can also be used as a technologic resource, such as a vector applied in gene therapy. Control over Ad replication could be beneficial for the combat of infections and for the technology of gene transfer. However, few tools exist that may useful for the inhibition of Ad replication. One important application would be to impede replication of helper adenovirus utilized in the production of recombinant Adenoassociated Virus (rAAV), thus minimizing the contamination of the rAAV production with helper virus. The objective of the study was to investigate the use of RNA interference (RNAi) directed against key adenoviral targets as an inhibitor of Ad replication. For this, lentiviral vectors encoding shRNAs for hexon, IVa2 and pol were constructed. Next, constitutive expression of the shRNAs was established in 293T cells, the parental cell line that is permissive for adenovirus replication. The shRNAs specific for hexon or IVa2 significantly promoted reduction in the level of these mRNAs as revealed by RT-qPCR quantification of the adenoviral transcripts. Next, knockdown of hexon was shown to be promising as an inhibitor of Ad replication, seen as the reduction of Ad produced in the 293T anti-hexon cell line. Both the knockdown of the hexon transcript and reduction in adenovirus replication were accentuated after cell sorting and isolation of cellular clones from the anti-hexon cell line. The anti-hexon clone showed significant reduction in the quantity of adenovirus particles when visualized by electron microscopy and 92% fewer infectious particles as compared to the parental 293T cells when full scale production was made. These results indicate that the use of shRNA technology for the inhibition of Ad replication is promising and represents the first step for the development of a strategy for the production of rAAV free from helper virus contamination (AU) | |
| FAPESP's process: | 12/05066-7 - Use of shRNA anti-hexon e anti-IVa2 during the production of adeno-associated virus as a strategy for eliminating helper adenovirus: Proof of principle |
| Grantee: | Marlous Vinícius Gomes Lana |
| Support Opportunities: | Scholarships in Brazil - Master |