Team:Amsterdam
From 2012.igem.org
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- | + | <h1>The Cellular Logbook</h1> | |
- | + | <p>A Prokaryotes have been selected through evolutionary processes for accurate sensing | |
- | Meet | + | and acting upon their living environments. This bacterial versatility can be used by |
- | of | + | us, humans, to sense the environments in places we have trouble reaching. Maybe we |
+ | would want to measure the conditions (e.g. nutrient availability, toxicity, pathogen | ||
+ | presence, light) somewhere deep under the ground, perhaps we would want to noninvasively | ||
+ | scan for biomarkers in diseased tissue in our bodies. The classical way | ||
+ | to make a bacteria tell us whether a certain event has happened is to link it to the | ||
+ | transcription of fluorescent proteins. This however requires constant monitoring and | ||
+ | maintenance in order to get an idea of the time-variation of the studied system. Could | ||
+ | we make the cell ‘remember’ what it has sensed and when so we can leave it alone for a | ||
+ | while and make it report back to us later?</p> | ||
+ | <p>Meet E. memo, a ‘cellular logbook’, which uses the naturally occurring phenomenon | ||
+ | of <b>DNA methylation</b> to robustly store signals it has sensed in its environment. The | ||
Amsterdam iGEM 2012 team, consisting of six students, will dedicate the summer to | Amsterdam iGEM 2012 team, consisting of six students, will dedicate the summer to | ||
the realization of this innovative and ambitious plan. This novel storage mechanism, | the realization of this innovative and ambitious plan. This novel storage mechanism, | ||
redesignating an evolutionarly designed tested and proven principle for novel purposes, | redesignating an evolutionarly designed tested and proven principle for novel purposes, | ||
could be linked to any of the many biological sensors that are available in the DNA | could be linked to any of the many biological sensors that are available in the DNA | ||
- | parts registry. | + | parts registry. E. memo therefore holds great promise as a detect & store–system for |
- | experimental and industrial purposes. | + | experimental and industrial purposes.</p> |
- | + | <p>Just storing whether certain signals have been sensed by the cell is only half of the story | |
- | + | however. The proposed memory mechanism would be a form of volatile memory, | |
- | + | of which the traces slowly dissappear as the E. memo-population keeps proliferating. | |
- | + | This is because methylation-patterns are not transferred to the progeny in eukaryotes. | |
- | + | We can use this our advantage. The most exciting part of our project would be to infer | |
- | + | when a signal has been sensed from the percentage of bits that is methylated, which | |
- | + | slowly decreases as the cells keep proliferating. This way, we won’t just store whether | |
- | + | a certain signal has occured; we will also know when it happened.</p> | |
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- | {{Team:Amsterdam/Foot}} | + | |
+ | <div class="content-block"> | ||
+ | <h2>Molecular mechanism</h2> | ||
+ | In short, we will introduce a site-specific methyltransferase into the iGEM default | ||
+ | chassis organism E. coli, that will only be active/transcribed when the measured signal | ||
+ | is encountered by the logbook-cell. The activated methyltransferase will then move | ||
+ | over to a plasmid region we’ve termed the bit and append a methyl-group to it. By | ||
+ | 1 | ||
+ | linking the methyltransferase to a Zinc-Finger, its site-specificity is greatly increased, | ||
+ | reducing the amount of undesired background methylation events to a minimum. | ||
+ | Furthermore, by slowing down the cell replication cycle of the cells, we can increase | ||
+ | the span of time we can use to do measurements on.</p> | ||
+ | </div> | ||
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+ | {{Team:Amsterdam/ernst/Foot}} |
Revision as of 09:53, 14 September 2012