#MIT  researchers have devised a set of genetic modules that respond to inputs much like the Boolean logic gates used in #computers . 
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Synthetic circuits integrating logic and memory in living cells

Piro Siuti, John Yazbek & Timothy K Lu

"Logic and memory are essential functions of circuits that generate complex, state-dependent responses. Here we describe a strategy for efficiently assembling synthetic genetic circuits that use recombinases to implement Boolean logic functions with stable DNA-encoded memory of events. Application of this strategy allowed us to create all 16 two-input Boolean logic functions in living Escherichia coli cells without requiring cascades comprising multiple logic gates. We demonstrate long-term maintenance of memory for at least 90 cell generations and the ability to interrogate the states of these synthetic devices with fluorescent reporters and PCR. Using this approach we created two-bit digital-to-analog converters, which should be useful in biotechnology applications for encoding multiple stable gene expression outputs using transient inputs of inducers. We envision that this integrated logic and memory system will enable the implementation of complex cellular state machines, behaviors and pathways for therapeutic, diagnostic and basic science applications."


In case you like the subject there is a community for biological computing on G+ https://plus.google.com/communities/117578997424311496437?hl=en
Moreover there is a G+ page about cellular computing https://plus.google.com/u/0/b/106140549977596536572/106140549977596536572/posts
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