Multiplicity of retrovirus infection and integration?

Howard Davis hdavis at
Thu Aug 5 14:49:31 EST 1999

  Our group has looked at the effect of MOI on retrovirus transduction.
More than one integrative event per cell can definitely occur, however,
the maximum number of events is a function of the initial active
retrovirus concentration and the number of target cells. As retroviruses
decay (half life ~7 hrs for murine leukemia viruses), the "million"
viruses don't all have the opportunity to infect the "one" target cell
before they are inactivated. Two papers you might want to take a look

Morgan et al., "Retrovirus infection: effect of time and target cell
J Virol. 1995 Nov;69(11):6994-7000.

LeDoux et al., "Kinetics of retrovirus production and decay."
Biotechnol Bioeng. 1999 Jun 20;63(6):654-62.

I'd be happy to provide you with additional info, so feel free to drop
me an e-mail. Hope this helps!


Paul Kowalski wrote:

> Hi -
> does any bionetter know of any papers discussing how often a given
> human
> or mouse cell can be infected by a integrative retrovirus? I.e. if you
> put 1 cell in a dish with a million retroviruses, how many
> integrations
> would you see? Also, I'm thinking of retroviral vectors here, so
> resistance to superinfection wouldn't be a issue. I've seen a paper
> from
> JC Burns group (Methods Cell Biol 1994;43 Pt A:99-112 ) mentioning
> that
> the env pseudotype matters- that generally cells infected with a high
> MOI of amphotropic virus only get 1 integration/cell, but they saw up
> to
> 4 integrations/cell with a VSV-G pseudotype, which they chalked up to
> the higher titers of VSV-retrovirus.
> If anyone knows any other literature regarding this, I'd really
> appreciate knowing! Thanks in advance-
> Paul Kowalski
> Postdoctoral Fellow - Genetics Dept.
> Stanford University School of Medicine
> kowalski at

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