Re: Lateral gene transfer

Steve Clark (ssclark@facstaff.wisc.edu)
Wed, 14 Aug 1996 14:43:36 -0500

>Steve Clark wrote, in response to my question about experimental
>studies of lateral gene transfer:
>
>>Would transposable elements, such as retroviral genomes,
>>intracisternal particle sequences, etc. qualify?
>
>Howard Temin, your legacy lives on! :-) Actually, I don't think
>retroviral phenomena are directly relevant to what I'm asking, although
>they certainly are (must be) part of the picture.
>
>Here's the sort of experiment I'd find impressive -- someone fix
>the details here if necessary:
>
>1. Determine the complete sequences of two simple eukaryotic
> species. We thus know whose genes belong to whom, a priori.
>
>2. Culture those species together with a bunch of retroviruses
> (whose genomes have also been completely sequenced, of course)
> which we believe may act as vectors.
>
>3. Assay the mess, after a while, to see which genes ended up where.
>
>Could that be done?

It has been done, the retroviruses that carry oncogenes are examples of
this. As you may know, a number of retroviruses have incorporated sequences
from one or two different cellular genes. the viruses then transfer the
sequence to a secondary infected host and so on. The only genes that have
been thus identified, are those that cause malignancy when transfered to a
susceptible host. We can reasonably assume that this sort of gene
transduction by reverse transcription happens more frequently than observed
because, so far, we have only looked at transduced genes that cause malignancy.

For those who do not have a background in molecular biology, the above
scenario is, in fact, the basis for experimental and therapeutic gene
transfer. Basically, most genes, upon cloning, can be inserted into a
retroviral vector when then delivers the gene into the genome of infected
hosts.

Steve
__________________________________________________________________________
Steven S. Clark, Ph.D. Phone: (608) 263-9137
Associate Professor FAX: (608) 263-4226
Dept. of Human Oncology and email: ssclark@facstaff.wisc.edu
UW Comprehensive Cancer Ctr
University of Wisconsin
Madison, WI 53792

"Universities are full of knowledge; the freshmen bring a little in,
the seniors take none away...the knowledge accumulates." Mark Twain
__________________________________________________________________________