Team:Toulouse/Project/Overviews

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      <a href="" class="link-banniere">ACKNOWLEGDEMENT<i></i></a>
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       <h2>Overviews</h2>
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       <h2>Overview</h2>
       <p>SubtiTree, a bacterium to save our trees</p>
       <p>SubtiTree, a bacterium to save our trees</p>
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  <p style="margin:0 auto; color:#696969; width:960px; padding-top:20px; font-size:16px;"> Project&nbsp;&nbsp;&nbsp;>&nbsp;&nbsp;&nbsp;Overview</p>
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SubtiTree, a bacterium to save our trees
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Among many other things, Southern France is well-known for the gorgeousness of its landscapes. Plane trees (<i>Platanus sp.</i>) are widely present and participate to the charm of this area, especially along the famous “Canal du Midi”. It is impossible to imagine this UNESCO World Heritage masterpiece without its trees. Unfortunately, these trees are threatened by a severe fungal infection called Canker Stain, and today the only treatment consists in a costly preventive tree-cutting and implies significant ecological troubles.
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Fungal diseases lead to major economic losses all over the world.
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Some pathogens trigger trachemycosis by disturbing the vascular system of the plant.  
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Canker is one of these infections especially affecting plane trees (Platanus sp.). Plane trees are widely present in Southern France and particularly along the famous Canal du Midi, participating to the site gorgeousness.  
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Facing this emergency, the students from the iGEM Toulouse Team, who enjoy chilling in this peaceful place, decided to be committed to the protection of their local heritage. Using a bacterium vector naturally present in the trees, our team offers an alternative solution originated from synthetic biology. Using different genetic modules, we engineered a bacterium (SubtiTree) capable of heading towards the pathogen, binding to its cell wall and finally delivering different fungicides to save the tree from its invaders. Our team also began to elaborate different strategies to prevent any accidental spreading of the optimized microorganism, thus limiting the ecological and ethical footprints of SubtiTree. Although our project originated from a very local and specific tree disease, it could be transposable to other plant diseases.
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Today, the only treatment consists in preventive tree-cutting which has a huge cost and implies significant ecological troubles.  
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Facing this emergency, our team offers an innovative alternative originated from synthetic biology.  
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<p class="title1">Choice of the chassis </p>
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<p class="texte"><i>Bacillus subtilis</i> has been reported to be an endophyte bacterium of a large variety of plants and trees. Therefore, this model organism is a perfect chassis for our project.  Already used to treat plant diseases and fungal pathogens, we aim to engineer <i>Bacillus subtilis</i> to fight Canker Stain from the inside of the tree. Injected directly in the tree sap, our smart bacterium will act as a curative and preventive drug.</p>
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<p class="legend">Figure 1: Schema of our general strategy</p>
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<p class="title1">Chemotaxis<a href="http://2014.igem.org/Team:Toulouse/Project/Chemotaxis"; style="font-size: 13px; cursor: pointer; color: #888; margin-left: 10px;"> Show more</a></p>
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The aim of our project is to make an endophytic bacterium capable of detecting the pathogen, and targeting it in order to deliver different fungicides to save the tree from its invaders.
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<p class="texte">First, the bacterium targets the pathogen with a chemotaxis module which recognizes the soluble molecules released by the fungus' cell wall (N-acetylglucosamine).</p>
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Considering ecological and ethical matters, this project limits the spreading of our engineered bacterium in the environment.  
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<p class="title1">Binding<a href="http://2014.igem.org/Team:Toulouse/Project/binding"; style="font-size: 13px; cursor: pointer; color: #888; margin-left: 10px;"> Show more</a></p>
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<p class="texte">Then, SubtiTree binds onto the pathogen using a chimeric protein anchored to the bacterium peptidoglycan and which can make a bridge between bacterial cell wall and fungal chitin, the main component of the pathogen's cell wall.</p>
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<p class="title1">Fungicides<a href="http://2014.igem.org/Team:Toulouse/Project/Fungicides"; style="font-size: 13px; cursor: pointer; color: #888; margin-left: 10px;"> Show more</a></p>
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<p class="texte">In the third step, our designed bacterium fights the pathogen by producing a powerful treatment of three different fungicides.</p>
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<p class="title1">Spreading <a href="http://2014.igem.org/Team:Toulouse/Project/Spreading"; style="font-size: 13px; cursor: pointer; color: #888; margin-left: 10px;">Show more</a></p>
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<p class="texte">Our team worked on different aspects to control SubtiTree's spreading. The aim is to prevent horizontal transfers between different bacteria and to limit the growth and the survival of the engineered bacterium inside the tree during one season.</p>
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color:#666; font-size:18px;">Chemotaxis</br>
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Latest revision as of 19:57, 17 October 2014