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

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132<br />

Figure 8.5<br />

Preparation of a gene library in a cosmid vector.<br />

Figure 8.6<br />

Different genes are expressed in different types<br />

of cell.<br />

Part I The Basic Principles of <strong>Gene</strong> <strong>Cloning</strong> <strong>and</strong> <strong>DNA</strong> <strong><strong>An</strong>alysis</strong><br />

Cell type A<br />

Cell type B<br />

Total cell <strong>DNA</strong><br />

Partial Sau3A<br />

digestion<br />

Sau3A sites<br />

Ligate into cosmid<br />

cos cos<br />

cos<br />

in vitro package,<br />

infect E. coli<br />

mRNA Protein<br />

~35 kb fragments<br />

Colonies<br />

+ other Petrie dishes<br />

= gene library<br />

Silent genes<br />

Silent genes<br />

mRNA Protein<br />

mRNA Protein<br />

mRNA Protein

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