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John M. S. Bartlett.pdf - Bio-Nica.info

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340 Stirling<br />

concentrations interfere with the processivity of the polymerase reactions, resulting in<br />

very short read lengths.<br />

• Primers should only be obtained from reliable sources and should be aliquoted to avoid<br />

repeated freeze thaw cycles. Any shorter primer species (e.g., n-1), in the PCR primer may<br />

not affect PCR efficiency. However, if the same primer is used for sequencing, a proportion<br />

of the fluorescent products will be primed from a shorter oligo. If the missing base is at the<br />

5′ end of the oligo, the product will be shorter, and hence the sequencing results will be<br />

confounded. This often results in a characteristic ‘shadow’ sequence.<br />

References<br />

1. Maxam, A. M. and Gilbert, W. (1977) A new method for sequencing DNA. Proc. Natl.<br />

Acad. Sci. USA 74, 560–564.<br />

2. Sanger, F., Nicklen, S., and Coulson, A. R. (1977) DNA sequencing with chain-terminating<br />

inhibitors. Proc. Natl. Acad. Sci. USA 74, 5463–5467.<br />

3. Innis, M. A., Myambo, K. B., Gelfand, D. H., and Brow. M. A. (1988) DNA sequencing<br />

with Thermus aquaticus DNA polymerase and direct sequencing of polymerase chain<br />

reaction-amplified DNA. Proc. Natl. Acad. Sci. USA 85, 9436–9440.

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