MBD Selection - M.magister Sheared Gill gDNA 8 of 24 Samples Set 1 of 3

M.magister (Dungeness crab) gill gDNA provided by Mackenzie Gavery was previously sheared on 20201026 and three samples were subjected to additional rounds of shearing on 20201027, in preparation for methyl bidning domain (MBD) selection using the MethylMiner Kit (Invitrogen).

Followed the manufacturer’s protocol for using <= 1ug of DNA (I’m using 1ug) with the following notes/changes:

  • Prepared beads for all 8 samples in single prep. Combined the amount of beads/protein needed for 8, 1ug reactions. Protein calculations and wash volumes were based off of 8ug of input DNA. Prepared beads were resuspended in 80uL (instead of 100uL) and 10uL were distributed to each of 8 tubes. Volume was then brought up to 100uL with 1x binding/wash buffer.

  • DNA capture incubation was performed overnight (~20hrs).

  • Non-captured DNA and wash volumes were combined in a single tube for each sample. These were stored at 4oC, but were not precipitated.

  • Ethanol precipitations were incubated at -80oC overnight (~20hrs).

  • Precipitated DNA was resuspended in 21uL of H2O (this allows the usage of 1uL for Qubit and leave 20uL as the maximum input volume for the subsequent PicoMethylSeq Kit (ZymoResearch)).

Samples were quantified using the Roberts Lab Qubit 3.0 with the Qubit 1x dsDNA HS Assay (Invitrogen), using 1uL of sample.

All samples were stored temporarily at 4oC.

For reference, all sample info for this project is here (Google Sheet):


Qubit results (Google Sheet):

Sample_ID Resuspension_vol(uL) Total_recovery(ng) Percent_recovery
CH01-06 21 2.90 0.29
CH01-14 21 2.98 0.30
CH01-22 21 3.40 0.34
CH01-38 21 6.05 0.60
CH03-04 21 25.20 2.52
CH03-15 21 2.69 0.27
CH03-33 21 3.53 0.35
CH05-01 21 14.62 1.46

Yields are much lower than expected, as Mac indicated that the M.magister genome was ~7% methylated. However, there is more than enough DNA for the subsequent library prep with the Pico MethylSeq Kit (Zymo).