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Theoretical and Experimental DNA Computation (Natural ...

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x<br />

w<br />

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y<br />

y<br />

u<br />

(a) (b)<br />

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(c)<br />

Fig. 6.8. Excision/inversion<br />

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6.6 Summary 155<br />

The model has been successfully applied to all known experimental data on<br />

the assembly of real genes, including the actin I gene of Urostyla gr<strong>and</strong>is <strong>and</strong><br />

Engelmanniella mobilis, the gene encoding α telomere binding protein in several<br />

stichotrich species, <strong>and</strong> assembly of the gene encoding <strong>DNA</strong> polymerase<br />

α in Sterkiella nova. Descriptions of these applications are presented in [124].<br />

6.6 Summary<br />

In this chapter we have introduced the notion of computing with <strong>and</strong> inside<br />

living cells <strong>and</strong> reviewed several models for the assembly of genes in ciliates.<br />

Although the fundamental molecular mechanisms underlying the operations<br />

within these models are still not well-understood, they do suggest possible<br />

areas of experimental enquiry. Looking further ahead, it may well be that<br />

in the future these mechanisms may even be exploited by using ciliates as<br />

prototype cellular computers. This engineering process has already begun,<br />

<strong>and</strong> we have cited several successful examples of the genetic modification of<br />

organisms for computational purposes.<br />

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