Difference between revisions of "Part:BBa K3179004"

Latest revision as of 18:48, 21 October 2019

2Kt-E1A

This part is constructed by adding a 2X Kturn sequence before the E1A gene of Ad5. Due to the existence of 2X Kturn, the translation of E1A is regulated by L7Ae. E1A is an early gene of adenovirus and is essential in the commence of viral replication. This part has an intron which also exists in E1A of the wild adenovirus. Using the splicing system in eukaryotes can make it function as normal. In our design, 2kt-E1A is used as a response part to initiate viral gene expression and lyse target cells.

We integrate 2kt-E1A with miR885-5p-target and miR663b-target so that while miRNA885-5p and miRNA663b are absent in the cell, E1A can be translated and initiate viral gene expression to lyse target cells.

Usage and Biology

Since the gene product of the E1 can initiate the gene replication of adenovirus and it’s not been reported that it has any other function in eukaryotic cells, SYSU-CHINA decided to transfection pTRE-E1A, which is a plasmid containing E1A gene regulated by pTRE, with replication-defective adenovirus, which lacks the E1 gene, into HeLa cell. The cell experiment showed that replication-defective adenovirus can’t replicate and lyse cells. However, if there is E1A existed, the virus can be autonomously replicable and lyse cells. As we see, higher concentration of pTRE-E1A can make better effect.

The cell viability assay is shown below. It can be easily seen that the cell viabilities in experimental group are lower than the control ones. Although the effect is not as good as we thought, it still means that it can function.

Sequence and Features