AlanFung:Protocol/Construction of Solexa sequencing Library: Difference between revisions
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Revision as of 18:55, 12 November 2009
Construction of Solexa sequencing library from padlock captured PCR products using NEBNext DNA Sample Prep Master Mix Set 1 Kit (E6040S/L)
- Info Read the FAQ!!!
- Protocol
- The NEBNext DNA SPMMS 1 (I) is compatible with protocols requiring a 3´ A overhang on the library molecules to facilitate ligation to adapters containing a 5´ T overhang, such as Illumina’s Genomic DNA Sample Prep protocol for the Genome Analyzer II.
- For 60bp run, we can use the library size of >180bp
- For 80bp runs, the lower limit for the sequencing libraries should be 200bp.
- If the library size is too small, some of the 80bp reads will reach to the other end of the adaptor sequences. we don't want to waste the sequencing $$ on the regions we don't want
- The total size of the adaptors is 105bp, and there is another ~25bp of the capturing arm
- The upper limit should be ~50bp above the lower limit
Overview
- Fragmentation and end-polishing
- Size Selection
- Ligation
- PCR of sequencing Library
- QPCR quantification
Fragmentation and end-polishing (Make blunt ends with 5'P)
- The PCR amplicons (200ng-1ug) are fragmented with Covaris sonicator to ~100bp
- End-Repair Reactions
Fragmented DNA | 85ul |
10X End Repair Bufer | 10ul |
End Repair Enzyme Mix | 5ul |
- Incubate tubes at RT for 30minutes.
- Perform a Qiaquick purification and elute with 39ul EB buffer.
- NOTE: For blunt-end ligation, the A-Tailing reaction should be skipped. Doing TA ligation is preferable since it eliminates the chance of getting chimeric reads.
- A-Tailing Reactions
Blunet-end DNA | 37ul |
10X dA-Tailing Reaction Buffer | 5ul |
Klenow Fragment (3'-5' exo-) | 3ul |
H2O | 5ul |
Incubated at 37C for 30min, purified with Qiaquick columns, eluted with 40 ul EB.
- Measure concentration with nanodrop
Size selection using Invitrogen 2% SizeSelect gel
- Fill any unused well with 30ul EB Buffer
- Mix 15ul EB buffer with 0.5ul ladder in a 0.2ml tube
- Load 20u end-polished DNA sample into two lanes(use 3 or more lanes if the starting DNA is more than 1ug)
- Run the SizeSelect program for 12~14 min. Pause when the 125bp band just move into the middle collection well
- Use pipette to extract all solution in each of the sample well, and quickly refill the wells with 20ul EB.
- Resume the electrophoresis for additional 15sec, extract DNA and refill the wells with 20ul EB. *Resume the electrophoresis for additional 15sec, extract DNA (all the extracted DNA from the same sample are mixed in a tube)
- Refill the wells with 20ul EB, and run the electrophoresis for additional 3 minutes. Take a picture of the gel to document the extracted fragment sizes.
- Concentrate the DNA with a SpeedVac (no heat) to ~36ul (takes about 1hour).
Ligation. Blunt-end and TA ligations use the same protocol but slightly different adaptor sequences.
- Set up ligation reaction. Note that the ATP in the Quick Ligase buffer hydrolyzes very quickly after several rounds of freeze/thaw cycles, so it’s a good idea to make small aliquots of a fresh tube of Quick Ligase Buffer, and use one small aliquot each time.
ul | |
End-repaired & size selected DNA | 36 |
40uM adaptor2 | 2 |
5X Quick Ligase Buffer | 10 |
Quick Ligase | 2 |
- Incubate at room temperature for 15 minutes, purified with MinElute columns, eluted with 22ul EB.
PCR of sequencing library
Solexa_PCR_up: AATGATACGGCGACCACCGAGATCTACACTCTTTCCCTACACGACGCTCTTCCGATCT
AmpR6.3Sol: CAAGCAGAAGACGGCATACGAGCTCTTCGGAACGATGAGCCTCCAAC
AmpF6.3rSol: CAAGCAGAAGACGGCATACGAGCTCTTCCAGATGTTATCGAGGTCCGA
Ligation products | 10 | 10 |
10uM solexa PCR up | 2 | 2 |
10uM AmpR6.3Sol | 2 | - |
10uM AmpF6.3Sol | - | 2 |
2X iProof master mix (Bio-Rad) | 50 | 50 |
50X SYBR Green I | 0.4 | 0.4 |
H2O | 36 | 36 |
- Setup 2 master mix
F | R | |
Ligation products | ||
10uM solexa PCR up | 13.2 | 13.2 |
10uM AmpR6.3Sol | 13.2 | - |
10uM AmpF6.3Sol | - | 13.2 |
2X iProof master mix (Bio-Rad) | 330 | 330 |
50X SYBR Green I | 2.64 | 2.64 |
H2O | 237.6 | 237.6 |
PCR program: 98 °C 30sec -> 8 cycles of (98°C 10sec -> 60°C 20 sec -> 72°C 15sec) -> 72°C 3min ->15°C hold.
Mix the amplicons with two sets of primers, purified with Qiaquick columns. Typically, the PCR products are clean enough for sequencing without further size selection.