Team:TU Eindhoven/RCA/Attaching

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                   <h2>Cell Encapsulation Modeling</h2>
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                   <h2>Attaching DNA to DBCO-PEG<sub>4</sub></h2>
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                  <p>The modeling group focused on the microfluidics. With microfluidics the cells are separated into a single droplet. This process however is not very accurate. Sometimes the droplets do not contain the desired number of cells. This can be modelled using a Poisson distribution. In this model you can define an average number of cells per droplet, lambda. Lambda was varied to choose a suitable average number of cells per droplet for our microfluidic device.</p>
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<img id='Fig1' src="https://static.igem.org/mediawiki/2014/5/50/TU_Eindhoven_Poisson_distribution.jpg" class="image_wrapper image_fr" width="1085">
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                  <p>For the Rolling Circle Amplification to be used on the surface of cells a DNA-primer has to be covalently linked to the cells. This primer can then be used to start the amplification of the DNA-strand to form the long strands needed for Multiple Chain Amplification. In order to attach DNA to the cell surface, the DBCO-Azido click system developed was used. The steps described focus on attaching a short DNA oligo to a DBCO-PEG<sub>4</sub> linker molecule. This is the building block that is used to click DNA to the cells and start a Rolling Circle Amplification reaction.</p>
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<p style="font-size:18px;color:#CCCCCC;">Figure 1. Poisson distribution for multiple lambdas.</p>
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<p>This allows for the determination of the ratios between one cell/zero cells and one cell/ two or more cells. These both have to be as high as possible for a specific lambda.</p>
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<h3>Summary</h3>
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<img id='Fig2' src="https://static.igem.org/mediawiki/2014/0/09/TU_Eindhoven_Modeling2.jpg" class="image_wrapper image_fr" width="1085">
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<figure style="float:right;margin-right:0;">
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<p style="font-size:18px;color:#CCCCCC;">Figure 2. Ratio between one cell/ zero cells or more cells</p>
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<img id='Fig1' src="https://static.igem.org/mediawiki/2014/f/f0/TU_Eindhoven_RCA5.jpg" width="500" style="display: inline-block; border: 4px solid #00BAC6; padding: 4px; background: #222; margin-bottom: 10px;">
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<p>Based on these results a lambda of 0.3 was chosen for the microfluidic device. The Poisson distribution for different number of cells becomes then as follows.</p>
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<p>In order to attach DNA-primers to a cell the click-system developed by Team Eindhoven 2014 can be used. For this to work the primer needs to be functionalized with a DBCO-group. This was done by attaching a DBCO-PEG<sub>4</sub> molecule to the oligo required for Rolling Circle Amplification.
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<br><br>
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<img id='Fig3' src="https://static.igem.org/mediawiki/2014/9/91/TU_Eindhoven_Modeling3.png" class="image_wrapper image_fr" width="1085">
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To attach the molecules which normally don’t react together, DBCO-PEG4-NHS ester was ordered as well as a 5’-amine with a twelve carbon spacer functionalized primer. These two molecules where reacted for two hours at room temperature to form the product.
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<p style="font-size:18px;color:#CCCCCC;">Figure 3. Modeled Poisson distribution for a specific lambda of 0.3 together with vs. the experimental Poisson distribution based on a lambda of 0.3.</p>
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<h4>Bibliography</h4>
<h4>Bibliography</h4>

Revision as of 09:22, 15 October 2014

iGEM Team TU Eindhoven 2014

iGEM Team TU Eindhoven 2014

Attaching DNA to DBCO-PEG4

For the Rolling Circle Amplification to be used on the surface of cells a DNA-primer has to be covalently linked to the cells. This primer can then be used to start the amplification of the DNA-strand to form the long strands needed for Multiple Chain Amplification. In order to attach DNA to the cell surface, the DBCO-Azido click system developed was used. The steps described focus on attaching a short DNA oligo to a DBCO-PEG4 linker molecule. This is the building block that is used to click DNA to the cells and start a Rolling Circle Amplification reaction.

Summary

In order to attach DNA-primers to a cell the click-system developed by Team Eindhoven 2014 can be used. For this to work the primer needs to be functionalized with a DBCO-group. This was done by attaching a DBCO-PEG4 molecule to the oligo required for Rolling Circle Amplification.

To attach the molecules which normally don’t react together, DBCO-PEG4-NHS ester was ordered as well as a 5’-amine with a twelve carbon spacer functionalized primer. These two molecules where reacted for two hours at room temperature to form the product.

Bibliography

Mazutis, Linas, John Gilbert, W Lloyd Ung, David A Weitz, Andrew D Griffiths and John A Heyman. Single-cell analysis and sorting using droplet-based microfluidics. Nature protocols 8.5 (2013): 870-891.

iGEM Team TU Eindhoven 2014