None, if it does not contain the gene or does not have the receptor required for the lentivirus to gain entry into the cell type. I have been answering many questions about Glycoproteins today. Glycoproteins are what the virus uses to enter the cell with a receptor to which the Glycoprotein binds to on the cell. If the cell does not contain the gene that CRISPR has a targeting sequence programmed for the CAS9 protein will not find the sequence of DNA that it needs to cut to silence the gene being a DNA Endonuclease. Secondly, there is the off chance if another gene contains a similar set of DNA that is the same as the targeted gene’s that it could also silence that gene by mistake but that is very rare since CAS9 has a targeting of DNA length of 5 to 12 base pairs, but if you made one with 5 base pairs the odds are much greater than a 12 base pair guide RNA targeted Cas9 DNA target.