Michael L. Sullivan mlsulliv at
Tue Jun 18 08:37:46 EST 2002

I think radioactivity is probably still the most sensitive, if one is 
set up to use it.  I too have recently detected single copy genes in 
alfalfa.  I used only 1 ug of DNA with a random primed DNA probe.  I 
can only imagine that a riboprobe (which generally give 3-10 fold 
higher signals) would work even better.


>I also concur, there is a huge difference in sensitivity between
>colorimetric detection and chemiluminesence.  Our lab routinely detected
>single copy genes in alfalfa using only 10 micrograms of DNA per lane.  As
>for the control, we routinely used only 5 - 10 pg of plasmid DNA.
>Dave A. Vadnais, PhD
>51 Country Lane
>London, ON
>N5Y 2H4
>Phone:  519-858-1792
>Cell:  519-857-7969
>e-mail: d_vadnais1 at


Michael L. Sullivan, 
U.S. Dairy Forage Research Center
1925 Linden Drive West
Madison WI, 53706

(608) 264-5144 Phone
(608) 264-5147 Fax


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