Southern blot analysis of
D10-ΔMSP1#2 gDNA following
no (URF) or three cycles (SRF). (A) Parental D10,
URF and SRF gDNA was digested with XmnI or EcoRI
separated on 0.6% agarose gel and transferred to a nylon
membrane. The filter was then hybridised with a TgDHFR-TS probe.
(B) URF or SRF gDNA was digested with a combination
of either XhoI, BglII, SpeI
or XhoI, BglII, XbaI
as indicated, electrophoresed on 0.6% agarose gel and transferred
to nitrocellulose membrane. The filter was hybridised with the 900
bp MSP-1 probe and the signal quantitated by phosphorimager
analysis. The larger band (4.4 or 2.8 kb) represents the single
endogenous copy of the MSP-1 target sequence (E)
while the 0.7 kb species corresponds to the XhoI–BglII fragment derived from the transfected plasmid (P).