GSM1571967: RRBS of primed 129 EpiSCs; Mus musculus; Bisulfite-Seq
Genomic DNA was extracted from snap-frozen cell pellets (Quick-gDNA MiniPrep, Zymo Research). 300ng of DNA was then digested overnight with MspI (NEB R0106) followed by end-repair (NEB E6050) and addition of a 3' overhang A using Klenow fragment (3'-5' Exo-, NEB M0212). The resulting DNA fragments were size-selected for ones shorter than 500bp using AMPure XP beads (Beckman Coulter A63881). 10ng of size-selected DNA was ligated, using quick T4 ligase (NEB M2200), into a cut and T-tailed plasmid containing a 6bp unique molecular identifier (UMI) sequence. The ligated plasmid was bisulfite converted and cleaned (EZ DNA methylation Gold kit, Zymo Research). The converted DNA was amplified using 25 cycles of PCR with GoTaq Hot Start polymerase (Promega M5005) and primers matching specific locations on the plasmid. The primer sites were cut from the amplicons using XbaI (NEB R0145) end EcoRI-HF (NEB R3101). Further details regarding the plasmid are available in Shipony Z et al. Dynamic and static maintenance of epigenetic memory in pluripotent and somatic cells. Nature 2014 Sep 4;513(7516):115-9. RRBS fragments underwent addition of a 3' overhang A using Klenow fragment (3'-5' Exo-, NEB M0212). The fragments were then ligated to Illumina compatible adapters using quick T4 ligase (NEB M2200) and amplified using 8 cycles of PCR with GoTaq Hot Start polymerase (Promega M5005) and primers matching the Illumina adapters. The final products underwent gel electrophoresis using NuSieve 3:1 agarose (Lonza 50094). Gel bands matching fragment sizes of 200-500bp were cut and the DNA was extracted (MinElute Gel Extraction Kit, Qiagen 28604). Libraries were then pooled and sequenced on HiSeq 2500 system according to the manufacturer's procedures.
GEO
GSM1571967