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I have tried twice to get it to work. Both to get it to my DNA (which was a big mess in
the end) and using indirect with anti-bodies (sometimes ok but most of the time huge
background and a lot of aggregates). My experience is that the q-dots tend to aggregate
and stick to the membrane of the nucleus. With bacteria I would think accessibility might
be a problem. The paraffin does not help either but with thin enough sections I guess it
would be doable. I would try first one q-dot staining before doing multi-colour FISH. The
few times I was successful the signals were absolutely great, that was indirect using a
digoxigenin labeled probe. You can also try a combination of both q-dots (when you get one
or two to work in you FISH) and conventional dyes.
Good luck,
Mariette
on 08-06-2010 21:01 Carl Boswell said the following:
> Hi all,
> A recent query came up here for which I had no answer. Someone wants to
> do multichannel FISH (up to 7 labels) and I immediately thought of
> quantum dots. However I don't know how easy it is to get Qdots into a
> fixed bacterium. The specimen will be paraffin embedded and sectioned
> gut of an insect. Any thoughts?
>
> Thanks,
> c
>
> Carl A. Boswell, Ph.D.
> Molecular and Cellular Biology
> University of Arizona
> 520-954-7053
> FAX 520-621-3709
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