ramped on the DCode system during the run
from 6368 C, giving a temperature ramp rate of 1.7 C/hr. By using these
conditions, the problem with determining the exact conditions is eliminated.
Another example of the advantage of TTGE over CDGE and DGGE is shown for
the KRAS exon 1 gene in Figure 2AD.
Since the denaturing conditions in TTGE span a wider range than CDGE,
several fragments with different melting behavior, that are analyzed on
separate gels by CDGE, can be analyzed on the same TTGE gel. This is illustrated
in Figure 3, where exons 59 and 11 of the TP53 gene are analyzed. Using
two different denaturing conditions and the same temperature ramp allowed
all of the exons to be analyzed at one time.
These examples demonstrate that the TTGE technique is more robust and
flexible than either DGGE or CDGE in mutation screening and represents
a new development with advantages for mutation screening in a diagnostic
With TTGE, the high reproducibility in casting a constant denaturant gel
and the rapid and high throughput of the analyses obtained by CDGE are
achieved. The problems in determining the exact denaturing conditions
for fragments with only one melting domain are eliminated. The focusing
of bands obtained by DGGE seems to be achieved, and since the denaturing
conditions in TTGE span a wider range, several fragments with different
melting behavior can be analyzed on the same gel.
1. Fisher, S. G. and Lerman, L. S., Proc. Nat. Acad. Sci. USA, 80, 15791583
2. Hovig, E., et al., Mutation Research, 262, 6371 (1991).
3. Brresen, A.-L., et al., Proc. Acad. Sci. USA, 88Page: All 1 2 3 4 Related biology technology :1
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