Precipitation was continued from yesterday. Samples were resuspended in 25uL of The RNA Storage Solution (from PolyAPursit Kit) and spec’d. Samples were stored @ -80C in Sam’s RNA box.
Tag Archives: Micro PolyA Purist
mRNA Isolation – hard clam gill #1 DNased RNA from today
DNased RNA from earlier today was split into four equal parts (175uL = 39.8ug). Three will be used for mRNA isolation and the fourth will remain as total RNA. Three of these were precipitated according to Ambion PolyAPurist Protocol: 1/10 volume 5M ammonium acetate, 1uL glycogen and 2.5 volumes of 100% EtOH. Incubated @ -80C for 30 mins. One sample was processed with the Promega PolyA Tract kit. The remaining two samples were processed according to PolyAPurist Protocol. Of those two, one of the samples was processed a second time to evaluate the effectiveness of running a sample through the PolyAPurist Protocol twice.
mRNA samples were precipitated O/N @ -20C according to the PolyAPurist Protocol.
mRNA – Precipitation continued from yesterday
Samples were pelleted and washed with 70% EtOH according to Ambion PolyA Purist protocol. Pellets were resuspended in 10uL of The RNA Storage Solution (included in the Ambion PolyA Purist Kit).
Results: The gill mRNA looks great! Good yield and good ratios. Hemocyte mRNA looks kinda rough and a very low yield (which was to be expected).
mRNA Isolation – Hard Clam gill and hemo RNA
mRNA was isolated according to Ambion PolyA Purist protocol. After mixing samples with resin, samples were incubated @ RT for 1hr. Samples were washed per the protocol. However, the hemo sample was not clearing from the spin columns with the protocol-directed 3 min. spins. The column had to be spun up to 15 mins. in order for the column to clear. 
Results: The gill mRNA looks good (~1.8ug). The concentration of the hemo sample is extremely low and is below the error threshold for the NanoDrop, but it may not be that bad. The samples are in a relatively large volume (~200uL) and the yield is expected to be very small. So, I will precipitate these samples O/N @ -20C according to Ambion PolyA Purist protocol in order to concentrate them.