Team:NU Kazakhstan/Aptamers

From 2013.igem.org

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<h3><center>Selection of ssDNA Aptamers for Use in Detection of Cancer Biomarker-Carcinoembryonic Antigen</center></h3>
<h3><center>Selection of ssDNA Aptamers for Use in Detection of Cancer Biomarker-Carcinoembryonic Antigen</center></h3>
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<div><u>PCR optimization conditions: our reagent and Qiagen reagents</u></div>
<div><u>PCR optimization conditions: our reagent and Qiagen reagents</u></div>
<p>Since PCR products, that were obtained using combination of our own reagents (Taq.pol from New England Biolabs, MgCl2 from NCB and so on), were faint on gel I decided to use Qiagen PCR amplification kit, which I found in the freezer. I run two reactions at the same. As the result bands for PCR products from Qiagen were more visible and stronger.</p>
<p>Since PCR products, that were obtained using combination of our own reagents (Taq.pol from New England Biolabs, MgCl2 from NCB and so on), were faint on gel I decided to use Qiagen PCR amplification kit, which I found in the freezer. I run two reactions at the same. As the result bands for PCR products from Qiagen were more visible and stronger.</p>
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<br/><img src="https://static.igem.org/mediawiki/2013/4/4b/Selex_1.png" alt="" />
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<img src="https://static.igem.org/mediawiki/2013/4/4b/Selex_1.png" alt="" />
<p>Conclusion: use Qiagen reagent kit for further PCR amplifications</p>
<p>Conclusion: use Qiagen reagent kit for further PCR amplifications</p>
<p>Problem: still having multiple bands and smears</p>
<p>Problem: still having multiple bands and smears</p>
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<div><u>Primer optimization: primer set 20uM, Primer set 0.5uM</u></div>
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<p>According to Qiagen kit the primer concentration for PCR amplification should be 0.5uM. So I did PCR amplification for primer concentration that we have been using and primer concentration according to Qiagen protocol. PCR amplification worked only with 20uM primer concentration.</p>
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<img src="https://static.igem.org/mediawiki/2013/1/1d/Selex_2.png" alt="" />
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<p>Conclusion: keep using primers that you have been using</p>
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<p>Problem: still having multiple bands</p>
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<div><u>Preparation for SELEX 9; PCR optimization: cycles 10, 12, 15 and 20</u></div>
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<p>To resolve problem with multiple banding I decided to use two different cycles 15 and 20. Then I further gel purified band from 15 cycle run (shown in red box)</p>
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<img src="https://static.igem.org/mediawiki/2013/5/5d/Selex_3.png" alt="" />
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<p>Conclusion: In 15 cycle PCR amplification program there is less by product comparing to 20 cycle PCR amplification program</p>
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<p>Problem: Still having multiple bands</p>
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Revision as of 18:10, 25 September 2013

NU_Kazakhstan




Selection of ssDNA Aptamers for Use in Detection of Cancer Biomarker-Carcinoembryonic Antigen

1. PCR AMPLIFICATION CYCLE AND PRIMER CONCENTRATION OPTIMIZATION EXPERIMENTS
PCR optimization conditions: our reagent and Qiagen reagents

Since PCR products, that were obtained using combination of our own reagents (Taq.pol from New England Biolabs, MgCl2 from NCB and so on), were faint on gel I decided to use Qiagen PCR amplification kit, which I found in the freezer. I run two reactions at the same. As the result bands for PCR products from Qiagen were more visible and stronger.

Conclusion: use Qiagen reagent kit for further PCR amplifications

Problem: still having multiple bands and smears

Primer optimization: primer set 20uM, Primer set 0.5uM

According to Qiagen kit the primer concentration for PCR amplification should be 0.5uM. So I did PCR amplification for primer concentration that we have been using and primer concentration according to Qiagen protocol. PCR amplification worked only with 20uM primer concentration.

Conclusion: keep using primers that you have been using

Problem: still having multiple bands

Preparation for SELEX 9; PCR optimization: cycles 10, 12, 15 and 20

To resolve problem with multiple banding I decided to use two different cycles 15 and 20. Then I further gel purified band from 15 cycle run (shown in red box)

Conclusion: In 15 cycle PCR amplification program there is less by product comparing to 20 cycle PCR amplification program

Problem: Still having multiple bands

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