Nucleic Acids Research, 1992, Vol. 20, No. 7 1691-1696
© 1992
MOLECULAR BIOLOGY |
Strand displacement amplificationan isothermal, in vitro DNA amplification technique
Department of Molecular Biology, Becton Dickinson Research Center PO Box 12016, Research Triangle Park, NC 27709, USA
*To whom correspondence should be addressed
Received December 4, 1991. Revised March 10, 1992. Accepted March 10, 1992.
Strand Displacement Amplification (SDA) Is an isothermal, in vitro nucleic acid amplification technique based upon the ability of Hindi to nick the unmodified strand of a hemiphosphorothioate form of its recognition site, and the ability of exonuclease deficient klenow (exo klenow) to extend the 3'-end at the nick and displace the downstream DNA strand. Exponential amplification results from coupling sense and antisense reactions in which strands displaced from a sense reaction serve as target for an antisense reaction and vice versa. In the original design (G. T. Walker, M. C. Little, J. G. Nadeau and D. D. Shank (1992) Proc. Natl. Acad. Scl 89, 392 396), the target DNA sample is first cleaved with a restriction enzyme(s) in order to generate a double-stranded target fragment with defined 5'- and 3'-ends that can then undergo SDA. Although effective, target generation by restriction enzyme cleavage presents a number of practical limitations. We report a new target generation scheme that eliminates the requirement for restriction enzyme cleavage of the target sample prior to amplification. The method exploits the strand displacement activity of exo klenow to generate target DNA copies with defined 5'- and 3'-ends. The new target generation process occurs at a single temperature (after initial heat denaturation of the double-stranded DNA). The target copies generated by this process are then amplified directly by SDA. The new protocol improves overall amplification efficiency. Amplification efficiency is also enhanced by improved reaction conditions that reduce nonspecific binding of SDA primers. Greater than 107-fold amplification of a genomic sequence from Mycobacterium tuberculosis is achieved in 2 hours at 37° C even in the presence of as much as 10 µg of human DNA per 50 µL reaction. The new target generation scheme can also be applied to techniques separate from SDA as a means of conveniently producing double-stranded fragments with 5'- and 3'-sequences modified as desired.
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