Difference between revisions of "Team:BNU-China/Interlab"

 
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         <h3> Interlab </h3>
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            <article id="Calibration" class="col-lg-10 col-lg-offset-1 col-md-12 col-md-offset-0 col-sm-offset-0 col-sm-12">
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                <h1 id="model-introduction">Calibration experiments</h1>
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<p>Before starting cell measurements work, we accomplished three sets of calibration measurements with materials provided by the committee, including an OD600 reference point, a particle standard curve and a fluorenscein standard curve. These tests and data greatly facilitated our following quantitative interlab experiments.</p>
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                <h2>Calibration 1 OD600 reference point and LUDOX</h2>
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                <p>According to the protocol, we performed three calibration experiments (OD600 reference point, particle standard curve and the fluorescence standard curve) before the body part began.</p>
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<p>In this experiment, we first uesd LUDOX CL-X provided by the committee to obtain a conversion factor as the intermediate variable between Abs600 and OD600 measurement. The LUDOX solution (45% colloidal silica suspension) is hardly scattering and gives a low absorbance value, making it an ideal material for correct the standard path length of spectrophotometers in different laboratories, which would greatly improve the accuracy of the following volume dependent experiments.</p>
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                <p>Results shown below. </p>
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                    <figcaption>
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                        Table 1. OD600 reference point
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                <p id="model-theory">4 replicates are measured respectively to acquire the average Abs600 of LUDOX CL-X solution and dH2O. Reference OD600 is given by the iGEM authority. The ratio of OD600/Abs600 is 3.652.</p>
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              <h2>Calibration 2 Particle Standard Curve</h2>
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                <p>After standardizing the absorbance value, we managed to conclude a conversion factor between Abs600 and the estimated number of cells. In this experiment, we used the silica beads delivered by iGEM committee and made a serial dilution in the 96-well plate according to the protocol. The beads’ size and optical charateristics are similar to cells and its concentration (amount of particles per volume)is known, allowing us to conduct a standard curve of particle concentration in 4 replicates. Origin data presented at the bottom of this page.</p>
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                        Figure 1A Particle Standard Curve
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                        Figure 1B Particle Standard Curve (log scale)
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<h2>Calibration 3 Fluorescence standard curve</h2>
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                <p>Fluorescence value is an important synthetic biology signal, but it can vary widely in different instruments. As a result, comparing the fluorescence output of test devices by creating a standard fluorescence curve can accurately standardize the amount and fluctuation of GFP fluorescencein in provided kits. In the fluorescence curve measurement, we used the fluorescein powder delivered by committee and made a serial dilution in the 96-well plate according to the protocol. 4 replicates were measured in total. Origin data presented at the bottom of this page.</p>
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                        Figure 2A Fluorescein Standard Curve
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                        Figure 2B Fluorescein Standard Curve(log scale)
   
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              <h1>Interlab</h1>
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              <p class="title1" style="text-align:center">The Peking iGEM 2016 team is participating in the third year of the iGEM Interlab study along with about 100 teams. We focused on quantifying expression of GFP in common, comparable or absolute units. </p>
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    <h4>Introduction</h4>
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    <h4>Method</h4>
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    <h4>Results</h4>
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        <ul>
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          <li><a href="#sequencing">Sequencing</a></li>
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          <li><a href="#data">Data</a></li>   
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    <h4>Discussion</h4>
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              <div class="texttitle">Introduction</div>
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              <div>                           
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                  <p>The Measurement Committee is committed to achieving reliable and repeatable measurement. Therefore the interlab study is established, measurements made in different laboratories by measuring the expression of GFP will be no more variable than measurements taken within the same lab.
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                  <p>After several years of hard work, the committee concluded a universal protocol for measuring GFP expression. In recent years, the interlab study aims to improve the protocol and identify and correct the sources of systematic variability as much as possible.
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                  <div class="texttitle">Method</div>
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                  <p>This year’s interlab study aims to reduce a major source of variability during fluorescence measurements: the number of cells in the sample. Normally, we take the Abs600 of a sample as a representation of its cell density, but still many previous studies showed that there was significant lab-to-lab variability(?). Therefore, we followed the protocols delivered by the iGEM authority and carried out this verification.</p>
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                  <br>
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                  <p>According to the protocol, we performed three calibration experiments (OD600 reference point, particle standard curve and the fluorescence standard curve) before the body part began. Results shown below. </p>
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                  <br>
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                  <img src="https://static.igem.org/mediawiki/2018/0/06/T--BNU-China--image_interlab_1.jpg">                 
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                  <p style="text-align:center;"><b>Table 1. OD600 reference point</b></p>
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                  <br>
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                  <p>Plasmids containing promoters and GFP were taken from The 2016 DNA Distribution Kit and all devices were transformed into <i>E. coli</i>. Fluorescence of colonies was checked up under UV light. </p>
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                  <p>5 ml of liquid LB-M medium with chloramphenicol were inoculated with two chosen colonies of each device. Liquid cultures were incubated for 16~18 hours in HONOUR INCURATOR SHAKER placed in incubator. OD of these cultures was measured by MAPADA UV-3100PC SPECTROPHOTOMETER and diluted to 0.02. Fluorescence of biological and also technical replicates was measured using Thermo VARIOSKAN FLASH following our protocol.
+
                  </p>
+
                    <a  id="sequencing"></a>
+
                    <br>
+
                  <div class="texttitle">Results</div>
+
                  <h3 class="classic-title";"><span>Sequencing</span></h3>
+
                  <p> • Device 1: J23101+I13504<br>
+
                      • Device 2: J23106+I13504<br>
+
                      • Device 3: J23117+I13504<br>
+
                      • Positive Control Device: I20270 in pSB1C3<br>
+
                      • Negative Control Device: R0040 in pSB1C3 </p>
+
  <p>
+
  >BBa_J23101 Part-only sequence (35 bp)<br>
+
      <span style="padding-left:45px">Tttacagctagctcagtcctaggtattatgctagc</span></p><p>
+
  >BBa_J23106 Part-only sequence (35 bp)<br>
+
      <span style="padding-left:45px">Tttacggctagctcagtcctaggtatagtgctagc</span></p><p>
+
  >BBa_J23117 Part-only sequence (35 bp)<br>
+
      <span style="padding-left:45px">Ttgacagctagctcagtcctagggattgtgctagc</span></p><p>
+
  >BBa_I13504 Part-only sequence (875 bp)<br>
+
      <span style="padding-left:45px">Aaagaggagaaatactagatgcgtaaaggagaagaacttttcactggagttgtcccaattcttgttgaattagatggtgatgttaatgggcacaaattttctgtcagtggagagggtgaaggtgatgcaacatacggaaaacttacccttaaatttatttgcactactggaaaactacctgttccatggccaacacttgtcactactttcggttatggtgttcaatgctttgcgagatacccagatcatatgaaacagcatgactttttcaagagtgccatgcccgaaggttatgtacaggaaagaactatatttttcaaagatgacgggaactacaagacacgtgctgaagtcaagtttgaaggtgatacccttgttaatagaatcgagttaaaaggtattgattttaaagaagatggaaacattcttggacacaaattggaatacaactataactcacacaatgtatacatcatggcagacaaacaaaagaatggaatcaaagttaacttcaaaattagacacaacattgaagatggaagcgttcaactagcagaccattatcaacaaaatactccaattggcgatggccctgtccttttaccagacaaccattacctgtccacacaatctgccctttcgaaagatcccaacgaaaagagagaccacatggtccttcttgagtttgtaacagctgctgggattacacatggcatggatgaactatacaaataataatactagagccaggcatcaaataaaacgaaaggctcagtcgaaagactgggcctttcgttttatctgttgtttgtcggtgaacgctctctactagagtcacactggctcaccttcgggtgggcctttctgcgtttata</span></p><p>
+
  >BBa_I20270 Part-only sequence (919 bp)<br>
+
      <span style="padding-left:45px">Ttgatggctagctcagtcctaggtacaatgctagctactagagtcacacaggaaagtactagatgcgtaaaggagaagaacttttcactggagttgtcccaattcttgttgaattagatggtgatgttaatgggcacaaattttctgtcagtggagagggtgaaggtgatgcaacatacggaaaacttacccttaaatttatttgcactactggaaaactacctgttccatggccaacacttgtcactactttcggttatggtgttcaatgctttgcgagatacccagatcatatgaaacagcatgactttttcaagagtgccatgcccgaaggttatgtacaggaaagaactatatttttcaaagatgacgggaactacaagacacgtgctgaagtcaagtttgaaggtgatacccttgttaatagaatcgagttaaaaggtattgattttaaagaagatggaaacattcttggacacaaattggaatacaactataactcacacaatgtatacatcatggcagacaaacaaaagaatggaatcaaagttaacttcaaaattagacacaacattgaagatggaagcgttcaactagcagaccattatcaacaaaatactccaattggcgatggccctgtccttttaccagacaaccattacctgtccacacaatctgccctttcgaaagatcccaacgaaaagagagaccacatggtccttcttgagtttgtaacagctgctgggattacacatggcatggatgaactatacaaataataatactagagccaggcatcaaataaaacgaaaggctcagtcgaaagactgggcctttcgttttatctgttgtttgtcggtgaacgctctctactagagtcacactggctcaccttcgggtgggcctttctgcgtttata</span></p><p>
+
  >BBa_R0040 Part-only sequence (54 bp)<br>
+
      <span style="padding-left:45px">tccctatcagtgatagagattgacatccctatcagtgatagagatactgagcac</span>
+
  </p></p>
+
                   
+
                    <a  id="data"></a>
+
                  <h3 class="classic-title";"><span>Data</span></h3>
+
                    <h4>OD600 Reference Point</h4>
+
                    <p><b>Table 1. OD600 Reference Point.</b></p>
+
                    <img src="https://static.igem.org/mediawiki/2016/f/f4/T--Peking--image_interlab_3.png">   
+
                    <br>
+
                    <h4>FITC Standard Curve</h4>
+
                    <p ><b>Table 2. Data of FITC standard curve.</b></p>
+
                    <img src="https://static.igem.org/mediawiki/2016/1/1b/T--Peking--image_interlab_4.png">
+
                    <img src="https://static.igem.org/mediawiki/2016/0/03/T--Peking--image_interlab_5.png">
+
                    <p ><b>Figure 2. FITC standard curve.</b></p>
+
                    <br>
+
                      <h4>Normalization</h4>
+
                      <p ><b>Table 3. Normalization.</b></p>
+
                      <img src="https://static.igem.org/mediawiki/2016/d/db/T--Peking--image_interlab_6.png">
+
                      <br>
+
                      <h4>Cell Measurement</h4>
+
                      <p ><b>Table 4. Raw data of Abs600 measurement.</b></p>
+
                      <img src="https://static.igem.org/mediawiki/2016/0/04/T--Peking--image_interlab_7.png">
+
                      <p ><b>Table 5. Blank subtraction and correction of Abs600 measurement.</b></p>
+
                     
+
 
+
 
+
 
+
 
+
<img src="https://static.igem.org/mediawiki/2016/e/ee/T--Peking--image_interlab_8.png">
+
                      <img src="https://static.igem.org/mediawiki/2016/7/71/T--Peking--image_interlab_9.png">
+
                      <p ><b>Figure 3. Blank subtraction and correction of Abs600 measurement.</b></p>
+
                      <p ><b>Table 6. Raw data of fluorescence measurement.</b></p>
+
                      <img src="https://static.igem.org/mediawiki/2016/5/52/T--Peking--image_interlab_10.png">
+
                        <p ><b>Table 7. Blank substraction and correction of fluorescence measurement.</b></p>
+
                      <img src="https://static.igem.org/mediawiki/2016/3/32/T--Peking--image_interlab_11.png">
+
                        <img src="https://static.igem.org/mediawiki/2016/6/67/T--Peking--image_interlab_12.png">
+
                        <p ><b>Figure 4. Blank subtraction and correction of fluorescence measurement.</b></p>
+
                          <p ><b>Table 8.Raw data of Fl/Abs600.</b></p>
+
                        <img src="https://static.igem.org/mediawiki/2016/d/d3/T--Peking--image_interlab_13.png">
+
                        <p ><b>Table 9. Raw data of average and SD.</b></p>
+
                      <img src="https://static.igem.org/mediawiki/2016/a/a1/T--Peking--image_interlab_14.png">
+
                      <img src="https://static.igem.org/mediawiki/2016/0/07/T--Peking--image_interlab_15.png">
+
                      <p ><b>Figure 4. Average level of devices.</b></p>
+
 
+
 
+
 
+
 
+
                 
+
 
+
                    <div class="texttitle">Discussion</div>
+
                    <p>It is noticeable that the promoter of the Device 1 is strongest followed by the promoter of the Device 2 and Device 3.</p>
+
 
+
                    <h3 class="classic-title";"><span>Appendix</span></h3>
+
                    <p>Individuals responsible for conducting InterLab study
+
  • Dong Yiming measured the devices.
+
  • Li Cheng processed the data.
+
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Latest revision as of 15:51, 9 October 2018

Team:BNU-CHINA - 2016.igem.org style = "font-family: Helvetica;"

Interlab

Before starting cell measurements work, we accomplished three sets of calibration measurements with materials provided by the committee, including an OD600 reference point, a particle standard curve and a fluorenscein standard curve. These tests and data greatly facilitated our following quantitative interlab experiments.

Calibration 1 OD600 reference point and LUDOX

According to the protocol, we performed three calibration experiments (OD600 reference point, particle standard curve and the fluorescence standard curve) before the body part began.

In this experiment, we first uesd LUDOX CL-X provided by the committee to obtain a conversion factor as the intermediate variable between Abs600 and OD600 measurement. The LUDOX solution (45% colloidal silica suspension) is hardly scattering and gives a low absorbance value, making it an ideal material for correct the standard path length of spectrophotometers in different laboratories, which would greatly improve the accuracy of the following volume dependent experiments.

Results shown below.

this is a pic
Table 1. OD600 reference point

4 replicates are measured respectively to acquire the average Abs600 of LUDOX CL-X solution and dH2O. Reference OD600 is given by the iGEM authority. The ratio of OD600/Abs600 is 3.652.

Calibration 2 Particle Standard Curve

After standardizing the absorbance value, we managed to conclude a conversion factor between Abs600 and the estimated number of cells. In this experiment, we used the silica beads delivered by iGEM committee and made a serial dilution in the 96-well plate according to the protocol. The beads’ size and optical charateristics are similar to cells and its concentration (amount of particles per volume)is known, allowing us to conduct a standard curve of particle concentration in 4 replicates. Origin data presented at the bottom of this page.

this is a pic
Figure 1A Particle Standard Curve
this is a pic
Figure 1B Particle Standard Curve (log scale)

Calibration 3 Fluorescence standard curve

Fluorescence value is an important synthetic biology signal, but it can vary widely in different instruments. As a result, comparing the fluorescence output of test devices by creating a standard fluorescence curve can accurately standardize the amount and fluctuation of GFP fluorescencein in provided kits. In the fluorescence curve measurement, we used the fluorescein powder delivered by committee and made a serial dilution in the 96-well plate according to the protocol. 4 replicates were measured in total. Origin data presented at the bottom of this page.

this is a pic
Figure 2A Fluorescein Standard Curve
this is a pic
Figure 2B Fluorescein Standard Curve(log scale)