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Gene Cloning and DNA Analysis: An Introduction, Sixth Edition ...

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Chapter 10 The Polymerase Chain Reaction 155<br />

Figure 9.10<br />

Size markers<br />

R R R<br />

1 2 3<br />

PCR<br />

PCR PCR<br />

Restrict<br />

1 2 3<br />

Gel electrophoresis of the PCR product can provide information on the template <strong>DNA</strong> molecule. Lanes 1 <strong>and</strong> 2 show,<br />

respectively, an unrestricted PCR product <strong>and</strong> a product restricted with the enzyme that cuts at site R. Lane 3 shows the<br />

result obtained when the template <strong>DNA</strong> contains an insertion in the amplified region.<br />

Figure 9.11<br />

Row<br />

A<br />

B<br />

C<br />

D<br />

E<br />

F<br />

G<br />

H<br />

Mix, PCR<br />

Repeat for all rows in<br />

all 10 trays = 80 PCRs<br />

Column 1 2 3 4 5 6 7 8 9 10 11 12<br />

Repeat for all columns in<br />

all 10 trays = 120 PCRs<br />

Mix, PCR<br />

Combinatorial screening of clones in microtiter trays. A library of 960 clones is screened by a series of PCRs, each with<br />

a combination of clones. The clone combinations that give positive results enable the well(s) containing positive clone(s)<br />

to be identified. For example, if positive PCRs are given with row A of tray 2, row D of tray 6, column 7 of tray 2, <strong>and</strong><br />

column 9 of tray 6, then it can be deduced that there are positive clones in well A7 of tray 2 <strong>and</strong> well D9 of tray 6.<br />

Although there are 960 clones, unambiguous identification of the positive clones is therefore achieved after just 200 PCRs.

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