User:Alexander S Mikheyev/Notebook/rotifer alien genes/2009/12/21

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18Dec09 Cycle Sequencing Post-reaction Clean Up & Resuspension

Steps 4 - 9 should be carried out without delay to prevent loss of pellets. DNA in formamide will degrade even if kept frozen. Reactions should be precipitated within 24 hours. After resuspension they should be sequenced within 3-5 days.

Supplies: Isopropanol 75 % and 70%, pipette tips, reservoir tray, paper towels, Costar foil sealer, HiDi formamide

Spin plate briefly.

Add 30µl 75% Isopropanol, seal with Costar foil, invert a few times to mix, shake sample to bottoms of wells.

Incubate at room temp for 15 minutes.

Centrifuge at 2800 RCF or 4200 RPM for 30 minutes.

Remove foil, invert on paper towel, "swirl" inverted plate and paper towel in circular motion on benchtop until most IPA falls out. Do not bang/slap/slam/tap inverted plate or pellet could be lost. (Alternatively a short spin at 100-200 RCF can be used. It is not necessary to get every last bit of IPA out of the wells.)

Add 50µl 70% IPA, seal with foil.

Spin at 2000 RCF or 3300 RPM for 10 minutes.

Remove foil and invert onto fresh paper towels.

With plate inverted on paper towel, spin at 200 RCF or 500 RPM for 1 minute.

Air dry for 20 minutes in the dark.

Resuspend in 7µl HiDi Formamide. (Note: Add formamide to all wells, even if you do not have a full plate of samples, or you will cause damage to the 3730XL capillary array.)

Spin plate briefly.

Seal with Costar foil. Store in freezer and plan to sequence within 3 days.