fly DNA extraction

[Jeff Otto]

In article <1994Sep16.203710 at ccvax>, mbyhsun at ccvax writes:
>What is the best way to isolate DNA from Drosophila? I need to get DNA for
>southern blots. Thanks.
>
>Chun-Chun

I have had good luck chilling them in a mortar and pestle to dry ice temp,
then grinding them up.  I then transfer the fly powder to a homogenization
buffer (unfortanately don't have the composition here), vortex and pellet
the nuclei.  Wash a few times in an extraction buffer, add proteinase K and
SDS to 100ug/ml and 1% respectively.  Cook for 1h at 50C, Phenol extract,
til no visible interphase, Phenol:Chloroform extract 3X, Chloroform extract
3X, add NaCl to 200mM and then add 2.5 vol 100% EtOH.  I then spoon out
the genomic DNA with a glass hook, and wash several times with 70% EtOH.

If this method sounds good to you, email me back and I will supply you
with all the particulars.

Jeff