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Re: Transposable elements

I have a question:

Does "position effect" mean something else than what I have learned is the
classical definition in our fly lab, which is the placement (of a P-element
or other transposable element) into the heterochromatic regions of the
chromosome, therefore having some silencing of the DNA due to repression,
vs. the insertion into regular euchromatin?  I don't know the plant jargon
well enough to know if that is what is meant by position effect, or if it
is just a generic term for being put any old place on a chromosome, and
therefore "hopping" into a gene (which could knock it out or make it
less/more functional) or even possibly landing in another functional region
of a gene, using enhancers from surrounding genes and being driven itself.
Even more likely is the possibility of landing nowhere important at all.

Stacy Holtzman
Howard Hughes Medical Institute
Bloomington, Indiana Z5b

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