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4 protocols using anti sox2

1

Immunocytochemical Analysis of mESC Dux Expression

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mESC clones expressing an HA-tagged Dux protein were fixed for 20 min with 4% paraformaldhyde, permeabilized for 5 min with 0.1% Triton-X 100, and blocked for 30 min with 1% BSA in PBS. Cells were then incubated for 1 hour with anti-HA.11 (Covance) or anti-NANOG (Active Motif) or anti-SOX2 (Active Motif) antibodies diluted in PBS with 1% BSA. After 3 washes, the cells were incubated with anti-mouse (HA) or anti-rabbit (NANOG, SOX2) Alexa Fluor 647-conjugated secondary antibodies for 1 hour and washed again three times. Every step until this point, was carried with cells in suspension. Pelleted cells were then resuspended in VECTASHIELD® Mounting Medium with DAPI (Vector Laboratories) and mounted on the coverslip. The slides were viewed with a Zeiss LSM700 confocal microscope.
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2

Recombinant PRMT7 and Antibody Validation

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Anti-PRMT7 antibodies were purchased from Epicypher (#13-1009), Santa Cruz Biotechnology (SC9882) and Millipore (#07-639). Anti-Nanog (#61419), anti-Sox2 (#39823) and anti-H4R3me2s (#61187) antibodies were from Active Motif. Anti-Oct4 (#2840), anti-c-Myc (#5605) and anti-Klf4 (#4038) antibodies were from Cell Signaling. Anti-β-actin antibody (A5441) was from Sigma-Aldrich. Anti-H4R3me1 antibody (PA5-27065) was from Thermo Scientific. Anti-H3 antibody (ab1791) was from Abcam. Anti-mouse Argonaute 2 (Ago2) antibody was from Wako Chemicals (292-67301) and Cell Signaling (2897P). The cDNA constructs of human (OpenBiosystem) and mouse PRMT7 (OpenBiosystem) were cloned into pCDH1-EF1-IRES-GFP vector (System Biosciences) using the cloning sites EcoRI and NotI. Human PRMT7's catalytic mutant (m. PRMT7) was generated from pCDH1-EF1-PRMT7-IRES-GFP by mutating several residues (E144A, E153A, E478A and H644A) using the QuickChange Site-Directed Mutagenesis Kit (Stratagene). These residues are likely located in arginine binding pockets according to crystal structures of PRMT1 and Caenorhabditis elegans PRMT7 (18 (link),19 (link)). Oligonucleotides used for cloning, ChIP-PCR, reverse-transcription (RT)-PCR, site-directed mutagenesis are listed in Supplementary Table S1.
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3

Immunocytochemical Analysis of mESC Dux Expression

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mESC clones expressing an HA-tagged Dux protein were fixed for 20 min with 4% paraformaldhyde, permeabilized for 5 min with 0.1% Triton-X 100, and blocked for 30 min with 1% BSA in PBS. Cells were then incubated for 1 hour with anti-HA.11 (Covance) or anti-NANOG (Active Motif) or anti-SOX2 (Active Motif) antibodies diluted in PBS with 1% BSA. After 3 washes, the cells were incubated with anti-mouse (HA) or anti-rabbit (NANOG, SOX2) Alexa Fluor 647-conjugated secondary antibodies for 1 hour and washed again three times. Every step until this point, was carried with cells in suspension. Pelleted cells were then resuspended in VECTASHIELD® Mounting Medium with DAPI (Vector Laboratories) and mounted on the coverslip. The slides were viewed with a Zeiss LSM700 confocal microscope.
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4

Western Blot Analysis of Cell Signaling

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Protein was extracted under the indicated conditions, and the protein lysate was separated by 10% sodium dodecyl sulphate-polyacrylamide gel electrophoresis. The proteins were then transferred to polyvinylidene fluoride membranes. After being blocked in 10% non-fat milk, the membranes were incubated with specific primary and secondary antibodies. The antibodies used were anti-SOX2 (Active Motif), anti-NSD2 (Cell Signaling Technology, CST), anti-H3K36me2 (Active Motif), anti-H3K27me3 (CST), anti-BCL2 (CST), anti-GAPDH (CST), anti-H3 (Abways), anti-ERK (CST), anti-pERK (CST), anti-AKT (CST) and anti-pAKT (CST).
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