GEMINIVIRUSES

1. Presented by:
Sara Barreto Tovio
Third semester
Pontifical Bolivarian University

2. Geminiviruses
The family Geminiviridae comprises
circular single-stranded DNA viruses
Geminivirus-derived proteins are
multifunctional and effective regulators
Virus-host interactions result in
changes in host gene expression
patterns

3. Methylation
DNA methylation is an epigenetic
mechanism
Plays important roles in gene
regulation and transposon silencing
Inhibits the expression of certain genes

4. GENERAL OBJETIVE
The role of active DNA
demethylation in plant-virus
interactions

5. Methods
RNA transcripts are quantified by reverse
transcribing them into cDNA first, then qPCR is
subsequently carried out
RT qPCR
Is used to detect, characterize and quantify
nucleic acids
qPCR

6. Methods
Is a popular technique to identify
physiologically relevant protein–protein
interactions by using target protein-specific
antibodies to indirectly capture proteins that
are bound to a specific target protein
Co-immunoprecipitation
Is a laboratory method used to detect specific
protein molecules from among a mixture of
proteins
Western blot analysis

7. Results
Figure 1 Figure 2

8. Results
Figure 2
Figure 4

9. Discussion
Zeng, W
Choi, Y
Yang, X.
Knockdown of DME expression leads to DNA
hypermethylation at hundreds of genomic
regions, which even- tually leads to
downregulated expression of dozens of genes
under normal growth conditions
DME was originally identified by
mutations that cause maternal effects
on seed viability
We have previously found that βC1 also
interacts with and inactivates SAHH to
reduce viral DNA methylation

10. Conclusions
A patology can be avoided
It is possible to identify which drug
reacts best against a specific virus
through genetic testing