Difference between revisions of "Team:Austin UTexas/Results"

 
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   <h2 class="w3-bar-item">Menu</h2>
 
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   <a href="https://2018.igem.org/Team:Austin_UTexas/Results/Parts" class="w3-bar-item w3-button">Part Plasmids</a>
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<p>Although bacteria can naturally synthesize GABA, we wanted to <b>increase expression of the <i>gadB</i> gene and subsequently GABA production in order to give our intended probiotic, <i>Lactobacillus plantarum</i>, a more potent medicinal quality</b>, with the idea that this GABA-overproducing probiotic can then be consumed by patients with bowel disorders, hypertension or anxiety (1). Overexpression of the <i>gadB</i> gene will be accomplished by placing it under the control of either the P8 or P32 constitutive promoters from <i>Lactococcus lactis</i> (2).
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<img src="https://static.igem.org/mediawiki/2018/d/d6/T--Austin_UTexas--BHRKitTable.jpeg"style = "width:400px;">
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<figcaption><b>Table 1:</b> This is the number of parts organized by type that have been made thus far. All contribute to the BHR kit and many are included in full assemblies.</figcaption>
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<p>To make our GABA-producing probiotic, we ultimately needed to assemble a GABA overexpression cassette plasmid. The intention is that bacteria containing this GABA overexpression cassette plasmid should produce high levels of GABA. In order to assemble this plasmid, we decided to utilize the Golden Gate Assembly method. In short, Golden Gate Assembly is a relatively new cloning method that allows for the creation of a multi-part DNA assembly (i.e. cassette plasmid) in a single reaction through the use of DNA parts containing specific, predefined suffixes and prefixes with recognition sites for Type IIs restriction enzymes (e.g. BsmBI and BsaI). The specificity of these suffixes and prefixes provides directionality of the desired DNA parts during the assembly process. For our purposes, we used the MoClo Yeast Tool Kit developed by John Dueber (3).</p>
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<p>There are millions of species of bacteria<sup>1</sup>, few of which are well characterized. However, these non-model organisms perform cellular processes and are native to harsh biomes, and this makes them of great interest to researchers<sup>2</sup>. Synthetic biologists take great interest in engineering such bacteria, in an attempt to harness their natural abilities<sup>3</sup>. Because finding the best way to genetically modify an organism can be a laborious and resource-demanding process, <b>we have developed a kit of modular plasmids, designed to quickly test multiple broad host range origins of replication (ORIs).</b> To do this, we used a cloning technique called Golden Gate Assembly (GGA) to build plasmids. GGA uses Type IIs restriction enzymes, which allows researchers to pick the overhang each cut produces. Therefore, many parts can be assembled together at once, in a specific order. The plasmids are minimal and standardized<sup>4</sup>. They include barcode sequences and reporter genes to indicate which plasmid is which.</p>  
  
<p>We decided to first assemble and test our Golden Gate plasmids in <i>E. coli</i>, which was chosen due to the ease in which we could genetically manipulate it. We then wanted to use these Golden Gate plasmids to genetically manipulate <i>L. plantarum</i>. This part of the project required us to assemble a Golden Gate compatible shuttle vector (that is replicable in both <i>E. coli</i> and <i>L. plantarum </i>) and transform <i>L. plantarum</i>.  Our experimental results are detailed below. </p>
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<p>We developed a reaction where a mixture of various plasmids with different origin of replications is transformed into a single sample of host bacteria. The colored reporters allow the researcher to quickly determine which origin of replication allow the host to replicate the plasmid. However, if the reporters are not expressed, there are included primers that sequence the barcode region of the plasmid, allowing for complete verification of which plasmid(s) worked.</p>
  
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<figcaption><b>Figure 1:</b>  This figure shows how the kit is used. A mixture of part plasmids is transformed into a sample of host bacteria, then it is plated on selective media. The colonies will express their colored reporter gene, indicating which plasmids are maintained by the host. If there are colonies, but no expression is apparent, then the colonies can be sequenced to determine which ORI allowed replication. <b>Knowing which ORIs a bacteria can use to maintain plasmids are important for researchers building their own plasmid for non-model bacteria.</b></figcaption>
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<p>After determining which Origin of Replication works best in their organism of interest, the researchers can then utilize our repository of dried GGA part plasmids to create their own assembly plasmids. Due to the standardization of our kit and GGA as a whole, users of our kit can create their own part plasmids and use them with the provided parts. For example, if a team wanted to produce a certain gene <i><b>X</b></i> in their host organism, they could use PCR to add on the proper overhangs to the gene to create a part plasmid, and then create their own assembly plasmid. All of this is possible due to GGA's modular design that maintains directionality.</p>
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<h4>References</h4>
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<ol>
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<li>Amann, R. and Rosselló-Móra, R. (2016) After All, Only Millions? American Society for Microbiology, 7 (4): 1-2. </li>
  
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<li>Nemergut, et al. (2011) Global patterns in the biogeography of bacterial taxa. Environmental Microbiology, 13: 135-144.</li>
  
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<li>Liu, H. and Deutschbauer, A. (2018) Rapidly moving new bacteria to model-organism status. Current Opinion In Biotechnolodgy, 51:116–122.</li>
  
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<li>Jain, A.,& Srivastava, P. (2013) Broad host range plasmids. FEMS Microbiol Lett, 348: 87–96. 10</1i>
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Latest revision as of 23:44, 17 October 2018


Results



Table 1: This is the number of parts organized by type that have been made thus far. All contribute to the BHR kit and many are included in full assemblies.

There are millions of species of bacteria1, few of which are well characterized. However, these non-model organisms perform cellular processes and are native to harsh biomes, and this makes them of great interest to researchers2. Synthetic biologists take great interest in engineering such bacteria, in an attempt to harness their natural abilities3. Because finding the best way to genetically modify an organism can be a laborious and resource-demanding process, we have developed a kit of modular plasmids, designed to quickly test multiple broad host range origins of replication (ORIs). To do this, we used a cloning technique called Golden Gate Assembly (GGA) to build plasmids. GGA uses Type IIs restriction enzymes, which allows researchers to pick the overhang each cut produces. Therefore, many parts can be assembled together at once, in a specific order. The plasmids are minimal and standardized4. They include barcode sequences and reporter genes to indicate which plasmid is which.

We developed a reaction where a mixture of various plasmids with different origin of replications is transformed into a single sample of host bacteria. The colored reporters allow the researcher to quickly determine which origin of replication allow the host to replicate the plasmid. However, if the reporters are not expressed, there are included primers that sequence the barcode region of the plasmid, allowing for complete verification of which plasmid(s) worked.

Figure 1: This figure shows how the kit is used. A mixture of part plasmids is transformed into a sample of host bacteria, then it is plated on selective media. The colonies will express their colored reporter gene, indicating which plasmids are maintained by the host. If there are colonies, but no expression is apparent, then the colonies can be sequenced to determine which ORI allowed replication. Knowing which ORIs a bacteria can use to maintain plasmids are important for researchers building their own plasmid for non-model bacteria.

After determining which Origin of Replication works best in their organism of interest, the researchers can then utilize our repository of dried GGA part plasmids to create their own assembly plasmids. Due to the standardization of our kit and GGA as a whole, users of our kit can create their own part plasmids and use them with the provided parts. For example, if a team wanted to produce a certain gene X in their host organism, they could use PCR to add on the proper overhangs to the gene to create a part plasmid, and then create their own assembly plasmid. All of this is possible due to GGA's modular design that maintains directionality.












References

  1. Amann, R. and Rosselló-Móra, R. (2016) After All, Only Millions? American Society for Microbiology, 7 (4): 1-2.
  2. Nemergut, et al. (2011) Global patterns in the biogeography of bacterial taxa. Environmental Microbiology, 13: 135-144.
  3. Liu, H. and Deutschbauer, A. (2018) Rapidly moving new bacteria to model-organism status. Current Opinion In Biotechnolodgy, 51:116–122.
  4. Jain, A.,& Srivastava, P. (2013) Broad host range plasmids. FEMS Microbiol Lett, 348: 87–96. 10