Team:DTU-Denmark-2/Project/introduction

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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#What is iGEM?" class="h1"><b>1</b> What is iGEM?</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#What is iGEM?" class="h1"> What is iGEM?</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#Synthetic Biology" class="h1"><b>1</b> Synthetic Biology?</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#Synthetic Biology" class="h1"> Synthetic Biology</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#The world calls for a better Assembly System" class="h1"> <b>2</b> The world calls for a better Assembly System</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#The world calls for a better Assembly System" class="h1"> The world calls for a better Assembly System</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#USER cloning" class="h1"><b>3</b> USER cloning</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#USER cloning" class="h1"> USER cloning</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#Outline of the Plug 'n' Play with DNA idea" class="h1"><b>4</b> Outline of the Plug 'n' Play with DNA idea</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#Outline of the Plug 'n' Play with DNA concept" class="h1"> Outline of the Plug 'n' Play with DNA concept</a><br><br>
<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#The mission of Plug 'n' Play with DNA"
<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#The mission of Plug 'n' Play with DNA"
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class="h1"><b>5</b> The mission of Plug 'n' Play with DNA</a><br><br>
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class="h1"> The mission of Plug 'n' Play with DNA</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#Application area" class="h1"><b>6</b> Application area</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#Application area" class="h1"> Applications</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#References" class="h1"><b>7</b> References</a><br><br>
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<a href="https://2011.igem.org/Team:DTU-Denmark-2/Project/introduction#References" class="h1"> References</a><br><br>
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<a name="What is iGEM?"></a><h1><b>What is iGEM?</b></h1>
<a name="What is iGEM?"></a><h1><b>What is iGEM?</b></h1>
<p align="justify">
<p align="justify">
-
<a href="https://igem.org/Main_Page">iGEM </a> (international Genetically Engineered Machine) competition is the world’s largest competition within Synthetic Biology, which is hosted by Massachussetts Institute of Technolgy (MIT). iGEM is considered the most prestigious competition for students in the field of biotechnology, which also makes it the world’s largest event within synthetic biology(1). <br>
+
The <a href="https://igem.org/Main_Page">iGEM </a> (international Genetically Engineered Machine) competition is the world’s largest competition within synthetic biology, and is hosted by Massachussetts Institute of Technolgy (MIT). The iGEM competition is considered the most prestigious competition for students in the field of biotechnology(1). <br>
<br>
<br>
The competition started out as a month-long course at MIT, where the students had to design a biological system. This course grew to a summer competition in 2004 with just 5 teams, and since then the competition has expanded dramatically with more than 160 teams from universities all over the world in 2011(1).<br>
The competition started out as a month-long course at MIT, where the students had to design a biological system. This course grew to a summer competition in 2004 with just 5 teams, and since then the competition has expanded dramatically with more than 160 teams from universities all over the world in 2011(1).<br>
<br>
<br>
-
The iGEM competition provide a library of standardized biological parts known as BioBricks that the teams can use for building the genetic machines. The teams can also submit their own BioBricks. Information about the BioBricks and a toolkit to make and manipulate them is provided by the <a href="http://partsregistry.org/Main_Page">Registry of Standard Biological Parts </a>. In the beginning of the summer, the teams receive a kit of BioBricks from the Registry of Standard Biological Parts. Over the summer, the teams work at their own universities, where they use these parts and parts of their own design to build biological systems that can operate in living cells(1). <br>
+
The iGEM competition provides a kit with standardized biological parts known as BioBricks, that the teams can use for building the genetic machines. The teams can also submit their own BioBricks. Information about the BioBricks and the toolkit to make and manipulate them is provided by the <a href="http://partsregistry.org/Main_Page">Registry of Standard Biological Parts </a>. Over the summer, the teams work at their universities, where they use the provided parts plus parts of their own design to build biological systems that can operate in living cells(1). <br>
<br>
<br>
-
iGEM is about manipulation of genetic material, where the only limit is one’s own imagination. The iGEM competition have demonstrated a new way to arouse student interest in modern biology and to develop their independent learning skills.<br>
+
iGEM is about manipulation of genetic material, where the only limit is ones own imagination. The iGEM competition has demonstrated a new way to arouse students interest in modern biology and to develop their independent learning skills.The project ideas are many and diverse, but overall they show great potential. <br>
<br>
<br>
-
The project ideas are many and diverse, but overall they…. …… cells that exhibit new and unusual properties by engineering sets of multiple genes together with mechanisms to regulate their expression.<br>
 
<br>
<br>
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<a name="Synthetic Biology"></a><h1><b>Synthetic Biology</b></h1>
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<br>
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<a name="Synthetic Biology"></a><h1><b>Synthetic Biology?</b></h1>
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<p align="justify">
<p align="justify">
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Synthetic biology is relatively new area of biological research that combines science and engineering. Synthetic Biology is the engineering of Biology. The goal of synthetic biology is to extend or modify the behaviour of organisms and engineer them to perform new and innovative tasks. An analogy conceptualizing both the goal and methods of synthetic biology is the computer engineering. Within computer engineering every constituent part is embedded in a more complex system that provides its context. Synthetic biology is about using standardized parts as DNA, RNA, proteins and metabolites to construct biochemical reactions that regulate physical processes. The parts can be combined in devices and modules in order to assemble complex pathways that can function as integrated circuits. Connection of pathways to each other and their integration into host cells allows the synthetic biologist to extend or modify the behaviour of cells in a programmatic fashion (2).
+
Synthetic biology is a relatively new area of biological research that combines science and engineering. Synthetic Biology is about modification of organisms by engineering them to perform new and innovative tasks. An analogy, both conceptualizing the goal and methods of synthetic biology, is computer engineering hierarchy, were  every constituent part is embedded in a more complex system that provides its context. Starting in the bottom of the hierarchy with transistors, capacitors, and resistors; second the engineered logic gates performing binary computations and finally the more complex integrated circuits. <br> This is equivalent to how synthetic biology works. In synthetic biology standardized parts such as DNA, RNA, proteins, and metabolites are used as the basic components. The device layer regulates physical processes by the constructed biochemical reactions. The parts can be assembled into modules in order to assemble more complex pathways, having similarity with the integrated circuits. Connection of pathways and their integration into host cells allow researchers to extend or modify the behaviour of cells in a programmatic fashion (2).
</p>
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<br>
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The Registry of Standard Biological Parts and iGEM make use of the <a href="http://partsregistry.org/Assembly:Standard_assembly">Standard Assembly </a> of BioBricks formulated by Tom Knight.  
The Registry of Standard Biological Parts and iGEM make use of the <a href="http://partsregistry.org/Assembly:Standard_assembly">Standard Assembly </a> of BioBricks formulated by Tom Knight.  
-
The Standard Assembly make use of restrictionsites for the four restriction enzymes EcoRI, XbaI, SpeI , and PstI. The BioBricks have to hold the restrictionsites for the two enzymes EcoRI and XbaI prefix and suffix the restrictionsites for the two enzymes SpeI and PstI. In order to have assembly correct the BioBrik can't contain any of these four restrictionsites within the BioBrick. However, if any of this four restriction sites are present, they will have to be eliminated by alterations like site-directed mutagenesis, which can be both time consuming and cause unwanted alterations. In developing new BioBricks from natural sources and higher organism than eukaryotes the illegal restricktion sites can be of a problem. Furthermore, when assembling BioBricks with the Standard Assembly System scars occur, which makes it impossible to create fusion proteins. Additionally, the Standard Assembly of BioBricks is limited in that it is only possible to put two BioBricks together at a time (3).
+
The BioBrick Standard Assembly makes use of the restriction recognition sites of the four restriction enzymes EcoRI, XbaI, SpeI, and PstI. The BioBricks are flanked by a prefix and a suffix containing the restriction recognition sites EcoRI, XbaI, and SpeI, PstI, respectively. To ensure a correct assembly the BioBricks cannot contain any of these four restriction recognition sites. This means that if any of these four restriction recognition sites are present, they will have to be eliminated by alterations like site-directed mutagenesis, which can be time consuming and laborious. In developing new BioBricks from natural sources and higher organism such as eukaryotes the illegal restriction sites can be a problem. Furthermore, when assembling BioBricks with the Standard Assembly System scars between the Biobricks are introduced, this can be a problem for the construction of fusion proteins. Additionally, the BioBrick Assembly Standard has the drawback that only two BioBricks can be assembled at a time (3).
</p>
</p>
<br>
<br>
<p align="justify">
<p align="justify">
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All in all, the iGEM competition and the fast growing field of synthetic biology calls for a simpler, faster and more efficient assembly system that are easily applied to both bacteria, fungi, and mammalian cells. </p>
+
All in all, the iGEM competition and the fast growing field of synthetic biology calls for a simpler, faster and more efficient assembly system that is easily applied to both bacteria, fungi, and mammalian cells. </p>
<br>
<br>
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<a name="USER cloning"></a><h1><b>USER cloning</b></h1>
<a name="USER cloning"></a><h1><b>USER cloning</b></h1>
<p align="justify">
<p align="justify">
-
In early 1990s, the uracil excision-based (USER) cloning was invented as a ligation-independent cloning technique that could substitute the conventional assembly systems that made use of restriction enzymes and ligase. In 2003 New England Biolabs (NEB) introduced the USER Friendly Cloning Kit. Although NEBs USER kit was simple and efficient, it was not compatible with proofreading polymerases that stalled when encountering a uracil base in the DNA template (4). This made the USER Friendly Kit unattractive, although the concept was brilliant. In recent years, proofreading polymerases have been developed that are compatible with the concept of USER cloning, since they can read through uracil (5).</p>
+
In the early 1990s, uracil excision-based (USER) cloning was invented as a ligation-independent cloning technique that could substitute the conventional cloning methods, which mades use of restriction enzymes and ligase. In 2003 New England Biolabs (NEB) introduced the USER Friendly Cloning Kit. Although NEBs USER kit was simple and efficient, it was not compatible with proofreading polymerases that stalled when encountering a uracil base in the DNA template (4). This made the USER Friendly Kit unattractive, although the concept was brilliant. In recent years, proofreading polymerases have been developed that are compatible with the concept of USER cloning, since they can read through uracil (5).</p>
<br>
<br>
<p align="justify">
<p align="justify">
-
The USER method applies long complementary overhangs on the PCR product(s) as well as on the destination vector. The overhangs on the PCR product are custom made, between 7-15 nucleotides long and deoxy uridine nucleotides substitute selected deoxy thymidine nucleotides. The PCR products containing the customized overhangs are treated with the USER enzyme, which is a mix of DNA glycosidase and DNA glycosylase-lyase endo VIII. This treatment results in release of the DNA sequence upstream the deoxy uridine nucleotide and the resulting exposed overhangs can anneal to each other to form a stable hybridization product. This product can now be transformed directly into E.coli without prior ligation (4,5,6). In order to avoid template carry-over after PCR, the PCR product is usually treated with the restriction enzyme DpnI. DpnI cleaves only when its recognition site is methylated. Unmethylated PCR-derived DNA will be left intact (5).  
+
The USER method applies long complementary overhangs on the PCR product(s) as well as on the destination vector. The overhangs on the PCR product are custom made, between 7-15 nucleotides long and deoxy uridine nucleotides substitute selected deoxy thymidine nucleotides. The PCR products containing the customized overhangs are treated with the USER enzyme, which is a mix of DNA glycosidase and DNA glycosylase-lyase endo VIII. This treatment results in release of the DNA sequence upstream of the deoxy uridine nucleotide and the resulting exposed overhangs can anneal to each other to form a stable hybridization product. This product can now be transformed directly into <i>E.coli</i> without prior ligation (4,5,6). In order to avoid template carry-over after PCR, the PCR product is usually treated with the restriction enzyme DpnI. DpnI cleaves only when its recognition site is methylated. Unmethylated PCR-derived DNA will be left intact (5).  
</p>
</p>
<br>
<br>
<br>
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<a name="Outline of the Plug 'n' Play with DNA idea"></a><h1><b>Outline of the Plug 'n' Play with DNA idea</b></h1>
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<a name="Outline of the Plug 'n' Play with DNA concept"></a><h1><b>Outline of the Plug 'n' Play with DNA concept</b></h1>
   
   
<p align="justify">
<p align="justify">
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We introduce a standardized assembly system based on the principle of USER cloning and the USER fusion Assembly standard introduced by the 2009 iGEM of DTU. The new assembly standrad called The Plug 'n' Play allowing easier cloning and is a combined standard and system. The Plug 'n' Play assembly standard can be found here (BBF RFC 80).<br><br>
+
We introduce a standardized assembly system based on the principle of USER cloning and the USER fusion Assembly standard introduced by the 2009 DTU iGEM team. The new assembly standard called Plug 'n' Play with DNA (<a href="http://bbf.openwetware.org/RFC.html#BBF_RFC_80:_Plug_.27n.27_Play_with_DNA">BBF RFC 80</a>) offers easier cloning and is a combined standard and assembly system.<br><br>
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Successful assembly of up to six biological parts in one reaction have in the conducted project proof to be possible. The upper limit of fragments that efficiently can be assembled has not been delineated.
+
The time required to construct devices and plasmids can be significantly reduced with the use of Plug 'n' Play. This is essential to be able to move beyond what we theoretically can create with synthetic biology and conducting it in practice. <br>
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The time for construction of devices and plasmids to create new synthetic biology system have hereby significantly been reduce. This is essential for move beyond imagination of what we can create with synthetic biology and solve fundamental problems in our communities. <br>
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<a name="The mission of Plug 'n' Play with DNA"></a><h1><b>The mission of Plug 'n' Play with DNA</b></h1>
<a name="The mission of Plug 'n' Play with DNA"></a><h1><b>The mission of Plug 'n' Play with DNA</b></h1>
<p align="justify">
<p align="justify">
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DTU-Denmark-2 introduces the standardized and versatile system called "Plug ‘n’ Play with DNA", where certain categories of biological parts can be gathered. We imagine that the parts is in the form of pre-produced PCR-products, which directly can be mixed with a backbone vector to make assembly of expression vectors possible in less than one day. All our parts in the form of PCR-products should be distributed like the original iGEM BioBricks in microtiter plates, but directly ready for cloning. Furthermore, the "Plug ’n’ Play" kit will contain a back-up plasmid of all parts to ensure amplification from a mutation free template if needed. The simple and easy use of the system have been demonstrated by developing a reporter targeting system for the filamentous fungi of <i>Aspergilli</i> as well as for mammalian cells. In collaboration with the Copenhagen iGEM team the system have been demonstrate the easy use for the bacteria <i>E. coli</i>.  
+
We introduce the standardized and versatile system called "Plug ‘n’ Play with DNA", where categories of biological parts can be gathered. We imagine that BioBricks in the form of pre-produced PCR-products, can be directly mixed with a backbone vector. This will make assembly of expression vectors possible in only a few hours. All our parts in form of PCR-products, should be distributed in microtiter plates, like the original iGEM BioBrick kit. The parts in Plug 'n' Play kit are directly ready for cloning. Furthermore, the "Plug ’n’ Play" kit will contain back-up plasmids of all parts to ensure amplification from a mutation free template if needed.
</p>
</p>
<br><br>
<br><br>
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<a name="Application area"></a><h1><b>Application area</b></h1>
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<a name="Application area"></a><h1><b>Applications</b></h1>
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<p align="justify">
 +
The Plug ‘n’ Play assembly standard can be applied in a lot of different contexts. Use of the Plug 'n' Play assembly standard is especially advantageous for high throughput projects. In a previous study by Hussam H. Nour-Eldin et. al. (5), they were able to clone 240 genes from a library into an expression vector in only three weeks with efficiency close to 95% (5).<br><br>
 +
Below we have listed some different applications in which our standard assembly would be particularly useful.<br>
 +
<dt>
 +
<dd><li>Construction of DNA libraries.</li></dd>
 +
<dd><li>High-troughput cloning.</li></dd>
 +
<dd><li>Development of vector systems for gene expression analysis.</li></dd>
 +
<dd><li>Development of genetic tools for eukaryotes.</li></dd>
 +
<dd><li>Development of reporter systems.</li></dd>
 +
</dt>
 +
<br>
 +
To proof our concept, we developed a reporter system for <a href="https://2011.igem.org/Team:DTU-Denmark-2/results/Proofofconcept/mammalian">mammalian cells </a> and for <a href="https://2011.igem.org/Team:DTU-Denmark-2/results/Proofofconcept/fungi"><i>Aspergillus nidulans</i></a>.
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Latest revision as of 21:42, 21 September 2011




Introduction


What is iGEM?

The iGEM (international Genetically Engineered Machine) competition is the world’s largest competition within synthetic biology, and is hosted by Massachussetts Institute of Technolgy (MIT). The iGEM competition is considered the most prestigious competition for students in the field of biotechnology(1).

The competition started out as a month-long course at MIT, where the students had to design a biological system. This course grew to a summer competition in 2004 with just 5 teams, and since then the competition has expanded dramatically with more than 160 teams from universities all over the world in 2011(1).

The iGEM competition provides a kit with standardized biological parts known as BioBricks, that the teams can use for building the genetic machines. The teams can also submit their own BioBricks. Information about the BioBricks and the toolkit to make and manipulate them is provided by the Registry of Standard Biological Parts . Over the summer, the teams work at their universities, where they use the provided parts plus parts of their own design to build biological systems that can operate in living cells(1).

iGEM is about manipulation of genetic material, where the only limit is ones own imagination. The iGEM competition has demonstrated a new way to arouse students interest in modern biology and to develop their independent learning skills.The project ideas are many and diverse, but overall they show great potential.


Synthetic Biology

Synthetic biology is a relatively new area of biological research that combines science and engineering. Synthetic Biology is about modification of organisms by engineering them to perform new and innovative tasks. An analogy, both conceptualizing the goal and methods of synthetic biology, is computer engineering hierarchy, were every constituent part is embedded in a more complex system that provides its context. Starting in the bottom of the hierarchy with transistors, capacitors, and resistors; second the engineered logic gates performing binary computations and finally the more complex integrated circuits.
This is equivalent to how synthetic biology works. In synthetic biology standardized parts such as DNA, RNA, proteins, and metabolites are used as the basic components. The device layer regulates physical processes by the constructed biochemical reactions. The parts can be assembled into modules in order to assemble more complex pathways, having similarity with the integrated circuits. Connection of pathways and their integration into host cells allow researchers to extend or modify the behaviour of cells in a programmatic fashion (2).



The world calls for a better Assembly System

The Registry of Standard Biological Parts and iGEM make use of the Standard Assembly of BioBricks formulated by Tom Knight. The BioBrick Standard Assembly makes use of the restriction recognition sites of the four restriction enzymes EcoRI, XbaI, SpeI, and PstI. The BioBricks are flanked by a prefix and a suffix containing the restriction recognition sites EcoRI, XbaI, and SpeI, PstI, respectively. To ensure a correct assembly the BioBricks cannot contain any of these four restriction recognition sites. This means that if any of these four restriction recognition sites are present, they will have to be eliminated by alterations like site-directed mutagenesis, which can be time consuming and laborious. In developing new BioBricks from natural sources and higher organism such as eukaryotes the illegal restriction sites can be a problem. Furthermore, when assembling BioBricks with the Standard Assembly System scars between the Biobricks are introduced, this can be a problem for the construction of fusion proteins. Additionally, the BioBrick Assembly Standard has the drawback that only two BioBricks can be assembled at a time (3).


All in all, the iGEM competition and the fast growing field of synthetic biology calls for a simpler, faster and more efficient assembly system that is easily applied to both bacteria, fungi, and mammalian cells.



USER cloning

In the early 1990s, uracil excision-based (USER) cloning was invented as a ligation-independent cloning technique that could substitute the conventional cloning methods, which mades use of restriction enzymes and ligase. In 2003 New England Biolabs (NEB) introduced the USER Friendly Cloning Kit. Although NEBs USER kit was simple and efficient, it was not compatible with proofreading polymerases that stalled when encountering a uracil base in the DNA template (4). This made the USER Friendly Kit unattractive, although the concept was brilliant. In recent years, proofreading polymerases have been developed that are compatible with the concept of USER cloning, since they can read through uracil (5).


The USER method applies long complementary overhangs on the PCR product(s) as well as on the destination vector. The overhangs on the PCR product are custom made, between 7-15 nucleotides long and deoxy uridine nucleotides substitute selected deoxy thymidine nucleotides. The PCR products containing the customized overhangs are treated with the USER enzyme, which is a mix of DNA glycosidase and DNA glycosylase-lyase endo VIII. This treatment results in release of the DNA sequence upstream of the deoxy uridine nucleotide and the resulting exposed overhangs can anneal to each other to form a stable hybridization product. This product can now be transformed directly into E.coli without prior ligation (4,5,6). In order to avoid template carry-over after PCR, the PCR product is usually treated with the restriction enzyme DpnI. DpnI cleaves only when its recognition site is methylated. Unmethylated PCR-derived DNA will be left intact (5).



Outline of the Plug 'n' Play with DNA concept

We introduce a standardized assembly system based on the principle of USER cloning and the USER fusion Assembly standard introduced by the 2009 DTU iGEM team. The new assembly standard called Plug 'n' Play with DNA (BBF RFC 80) offers easier cloning and is a combined standard and assembly system.

The time required to construct devices and plasmids can be significantly reduced with the use of Plug 'n' Play. This is essential to be able to move beyond what we theoretically can create with synthetic biology and conducting it in practice.


The mission of Plug 'n' Play with DNA

We introduce the standardized and versatile system called "Plug ‘n’ Play with DNA", where categories of biological parts can be gathered. We imagine that BioBricks in the form of pre-produced PCR-products, can be directly mixed with a backbone vector. This will make assembly of expression vectors possible in only a few hours. All our parts in form of PCR-products, should be distributed in microtiter plates, like the original iGEM BioBrick kit. The parts in Plug 'n' Play kit are directly ready for cloning. Furthermore, the "Plug ’n’ Play" kit will contain back-up plasmids of all parts to ensure amplification from a mutation free template if needed.



Applications

The Plug ‘n’ Play assembly standard can be applied in a lot of different contexts. Use of the Plug 'n' Play assembly standard is especially advantageous for high throughput projects. In a previous study by Hussam H. Nour-Eldin et. al. (5), they were able to clone 240 genes from a library into an expression vector in only three weeks with efficiency close to 95% (5).

Below we have listed some different applications in which our standard assembly would be particularly useful.

  • Construction of DNA libraries.
  • High-troughput cloning.
  • Development of vector systems for gene expression analysis.
  • Development of genetic tools for eukaryotes.
  • Development of reporter systems.

  • To proof our concept, we developed a reporter system for mammalian cells and for Aspergillus nidulans.



    References

    [1] https://igem.org/About (Website, accessed 19/09/2011)

    [2] Andrianantoandro, E. et. al. Synthetic biology: new engineering rules for an emerging discipline. Molecular Systems Biology: 10: 1-14 (2006).

    [3] http://partsregistry.org/Assembly:Standard_assembly (Website, accessed 19/09/2011) [4] New England Biolabs, 2004

    [5] Hussam H. Nour-Eldin, Fernando Geu-Flores, and Barbara A. Halkier. USER Cloning and USER Fusion: The Ideal Cloning Techniques for Small and Big Laboratories. Methods in Molecular Biology 643.


    [6] Nørholm, M. H. H. A mutant Pfu DNA polymerase designed for advanced uracil-excision DNA engineering. BMC Biotechnol. 10, 21 (2010).