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content/2-genbank_ref.png

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content/2x PCR mastermix.md

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See [[standard pcr protocol]].
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### 1.5x Green PCR mastermix (mastermix with PCR compatible loading buffer)
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### 1.5x Green PCR mastermix (mastermix with PCR compatible loading buffer)
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The 2xPCR mastermix can be combined with a PCR compatible loading buffer such as the in described in the table below. This saves time if you have many samples as they can be loaded directly on a gel. Use 33 µL of the 1.5x Green PCR mastermix for a 50 µL PCR reaction. Scale up or down as needed.
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| 2x PCR mastermix | 25 |
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| [[6x DNA loading buffer\|6 x DNA loading buffer (PCR compatible)]] | 8 |
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| Total | 33 |
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### For MEC lab members:
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This [google sheet](https://docs.google.com/spreadsheets/d/1KWIgyq6alo-SgLN6TYQieGoHQNPxkIb1-JcRGnsbUoc/edit#gid=849990250) contains the recipe above. Create a new tab named after the date of preparation in [ISO 8601](https://xkcd.com/1179) format.
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Copy paste an old recipe and modify if necessary.
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### Testing
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Since we make our own mastermix, we need a standardized test. We use the following mix:
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- 10 µL Primer 18
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- 2 µL Chromosomal DNA from yeas
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The primers amplify a 1288 bp PCR product from the DFR1 locus in *S. cerevisiae*
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The primers amplify a 1288 bp PCR product from the DFR1 locus in _S. cerevisiae_
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using this program consisting of initial denaturation for 4 min at 94 °C, followed by 30 cycles of 94 °C for 30s, 50 °C for 30s, and 72 °C for 45 s, and a final extension at 72 °C for 5 min. [Source](https://link.springer.com/book/10.1007/978-1-0716-3358-8)
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```
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This PCR reaction is very robust and gives a high yield.
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Primers
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- 19_D-DFR1 GACTCAGACAGGTTGAAAAGAAGAC
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- 18_A-DFR1 CAAAGGTTTGGTTTTCAGTTAAGAA
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- 19\_D-DFR1 GACTCAGACAGGTTGAAAAGAAGAC
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- 18\_A-DFR1 CAAAGGTTTGGTTTTCAGTTAAGAA

content/3-genbank_ref.png

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content/4-genbank_ref.png

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content/6x DNA loading buffer.md

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This mixture will have the right fraction of loading buffer.
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## Preparation
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The table below contain the components of a 6x loading buffer used in the lab. It has two colors
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one bluish that migrates slowly and one yellow that migrates rapidly. This loading buffer should be
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compatible with PCR (see below). Note that the buffer should contain either Orange G *or* Tartrazine
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compatible with PCR (see below). Note that the buffer should contain either Orange G _or_ Tartrazine
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as the yellow color. Orange G is preferred since it migrates faster.
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| Component |Quantity |Concentration (w/v)| Final concentration |Function |
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| Water | - | to 50 mL | | - |
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| Total | 50 mL | | | |
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Recipe for 50 mL 6x DNA loading buffer:
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- add 6.25g [FICOLL 400](https://www.sigmaaldrich.com/catalog/product/sigma/f2637) powder to a new 50 mL FALCON tube.
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- add [[ddH2O]] to about 30 mL, shake to dissolve. This may take time, heating the tube in a water bath helps.
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- add 7.5 mg Xylene Cyanol FF powder
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- add 7.2 mL Orange G (1% w/v) ***OR*** 900 µL of VAHINE yellow contains [Tartrazine](http://en.wikipedia.org/wiki/Tartrazine)
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- add 7.2 mL Orange G (1% w/v) _**OR**_ 900 µL of VAHINE yellow contains [Tartrazine](http://en.wikipedia.org/wiki/Tartrazine)
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- add water to 50 mL
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The resulting solution is about the same colour as the GoTaq green flexi buffer commercialized
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by [Promega](https://worldwide.promega.com/products/pcr/endpoint-pcr/gotaq-reaction-buffers/?catNum=M7911).
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The gel below shows GoTaq green flexi buffer loaded on gel.
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![[gotaq.jpg]]
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This loading buffer is be compatible with PCR, add it to 16% (v/v) of the final PCR (8 µL in a 50 µL reaction) volume. This can be added to the [[2x PCR mastermix]].
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The yellow food coloring contain Tartrazine (E102). In this case, exact concentration
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is not known, but could be measured using a spectrophotometer at the absorption
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maximum of 472 nm. The molar absorptivity of Tartrazine at 472 nm is 20,330 L mol-1 cm-1.
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### Developmen
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#### FICOLL 400 (Density)
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From invitrogens website I found the following information:
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Xylene Cyanol (0.02%), Tartrazine and Ficoll (2.5%) do not inhibit this enzyme (recombinant Taq).
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```
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Xylene Cyanol (0.02%), Tartrazine and Ficoll (2.5%) do not inhibit this enzyme (recombinant Taq).
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```
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The information was avaliable thorugh this [link](http://www.invitrogen.com/site/us/en/home/Products-and-Services/Applications/PCR/pcr-enzymes-master-mixes/taq-dna-polymerase-enzymes/taq_dna_polymerase.html).
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Kramer 2001 suggests to add 0.5 - 1% Ficoll 400. Surpisingly they refer to v/v:
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add Ficoll 400 to a final concentration of 0.5% to 1% (v/v)
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```
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add Ficoll 400 to a final concentration of 0.5% to 1% (v/v)
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```
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Kramer, M. F., & Coen, D. M. (2001). Enzymatic amplification of DNA by PCR: standard procedures and optimization. Current Protocols in Molecular Biology / Edited by Frederick M. Ausubel... [et Al.], Chapter 15, Unit 15.1.
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Kramer, M. F., & Coen, D. M. (2001). Enzymatic amplification of DNA by PCR: standard procedures and optimization. Current Protocols in Molecular Biology / Edited by Frederick M. Ausubel... \[et Al.], Chapter 15, Unit 15.1.
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#### Xylene Cyanol FF (Blue)
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[![[1X_Quick-Load_Taq_Master_Mix.png]]](M0271Datasheet-Lot0211206.pdf)
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The final loading buffer should have 0.0025% (w/v) dye.
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The loading buffer is 6x concentrated, so the loading buffer should have 0.0025 * 6 = 0.015% (w/v).
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If we assume a density of 1 g/mL (the final buffer is denser), we should add (0.015/100) * 50000 = 7.5 mg of dye to 50 mL.
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The loading buffer is 6x concentrated, so the loading buffer should have 0.0025 \* 6 = 0.015% (w/v).
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If we assume a density of 1 g/mL (the final buffer is denser), we should add (0.015/100) \* 50000 = 7.5 mg of dye to 50 mL.
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#### Orange G
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VAHINE available in Portugal (see above). In our
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recipe the final concentration is (0.9 mL / 50 mL ) / 6 = 0.3 % (v/v).
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### Misc
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VAHINE food coloring comes in a package with blue, red and yellow. It has the following components:
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### Links
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- <http://www.wendychao.com/science/protocols/loading_buffer/>
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- <http://www.protocol-online.org/biology-forums-2/posts/12397.html>
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- <http://www.geneticorigins.org/pv92/recipes2.htm>

content/Accuracy-and-Precision.png

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content/Acknowledgement.md

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Example acknoledgement section updated on 2022-02-16:
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Example # Acknowledgement section updated on 2022-02-16:
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We thank Professors Jin Hou, Xiaoming Bao and colleagues for sending us the malonyl-CoA sensor.
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content/Agar.md

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in a Schott flask. These can be kept at room temperature almost indefinitely.
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For 500 mL solid medium (~20 plates):
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- 1 L Schott flask
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- 10 g Agar
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- ~200 mL water
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- \~200 mL water
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- Optional a magnetic stirrer bar
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Sterilize by autoclaving.
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Sterilize by autoclaving.
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Add water and media components to 500 mL and heat in a microwave oven (5-10 min) until the agar has been dissolved.

content/Agarose electrophoresis.md

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modified: 2026-03-13T08:02:06.968+00:00
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## Purpose
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Agarose gel electrophoresis separates DNA fragments based on size. It is commonly used to verify:
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- DNA fragment sizes
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DNA migrates through agarose toward the positive electrode because DNA is negatively charged. Smaller fragments move faster than larger ones.
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# Preparing DNA Samples for Loading
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DNA samples should be mixed with a **loading buffer** before loading into the gel in most cases.
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PCR reaction mix, substitute 17 µL of water with [[6x DNA loading buffer]].
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You can also prepare [[2x PCR mastermix]] with loading buffer. For each 100 µL of 2x mastermix, substitute
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17 * 2 = 34 µL of water with [[6x DNA loading buffer]].
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17 \* 2 = 34 µL of water with [[6x DNA loading buffer]].
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> [!WARNING]
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>Not all loading buffers are PCR compatible. Do not use other loading buffers in the lab without verifying tha
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>the buffer is compatible with PCR
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> Not all loading buffers are PCR compatible. Do not use other loading buffers in the lab without verifying tha
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> the buffer is compatible with PCR
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# Using 6× Loading Buffer
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If you have several, samples, spot the loading buffer on a piece of parafilm as shown below. Add water if needed
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![[GEL-1.png]]
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# Typical Agarose Gel Percentages
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Higher agarose concentrations resolve smaller fragments better.
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<http://www.gelanalyzer.com/index.html>
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<http://sourceforge.net/projects/pyelph/files/releases/>
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- [[How many times can I reuse electrophoresis buffer?]]
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- [[TAE]]
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- [[FatVal]]
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- [[fatval]]
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- [[Turner]]
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- [[Bachman]]
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- [[Midori Green DNA loading buffer (LBx2wMidori)]]

content/ApE-20240924103839571.png

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