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6 protocols using m11217

1

Immunofluorescence Staining of Cellular Markers

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Immunofluorescence staining was performed using standard procedures7 (link),71 . Primary antibodies used were mouse anti-Fas III (1:200, DSHB, 7G10), anti-HA (1:200; Sigma-Aldrich H3663), anti-PCNA (1:200; Santa Cruz sc-56), anti-GFP (1:1,000; Abcam ab 13970), anti-mKO (1:200; MBL PM051M), anti-mCherry (1:1000; Invitrogen M11217), anti-H3K27me3 (1:200; Millipore 07–449), anti-H4K20me2/3 (1:400; Abcam ab7817), anti-ssDNA (1:100, DSHB) and anti-BrdU (1:200; Abcam ab6326). BrdU analogue was Invitrogen B23151 5-bromo-2´-deoxyuridine (BrdU). Secondary antibodies were the Alexa Fluor-conjugated series (1:1000; Molecular Probes). Confocal images for immunostained fixed sample were taken using Zeiss LSM 700 Multiphoton confocal microscope with 63x or 100x oil immersion objectives and processed using Adobe Photoshop software.
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2

Immunofluorescence Staining of Cellular Markers

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Immunofluorescence staining was performed using standard procedures7 (link),71 . Primary antibodies used were mouse anti-Fas III (1:200, DSHB, 7G10), anti-HA (1:200; Sigma-Aldrich H3663), anti-PCNA (1:200; Santa Cruz sc-56), anti-GFP (1:1,000; Abcam ab 13970), anti-mKO (1:200; MBL PM051M), anti-mCherry (1:1000; Invitrogen M11217), anti-H3K27me3 (1:200; Millipore 07–449), anti-H4K20me2/3 (1:400; Abcam ab7817), anti-ssDNA (1:100, DSHB) and anti-BrdU (1:200; Abcam ab6326). BrdU analogue was Invitrogen B23151 5-bromo-2´-deoxyuridine (BrdU). Secondary antibodies were the Alexa Fluor-conjugated series (1:1000; Molecular Probes). Confocal images for immunostained fixed sample were taken using Zeiss LSM 700 Multiphoton confocal microscope with 63x or 100x oil immersion objectives and processed using Adobe Photoshop software.
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3

Immunohistochemistry of Labeled Neurons

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After slicing, samples for immunohistochemistry were blocked with 2.5% normal donkey serum / 2.5% normal goat serum / 0.5% Triton X-100/PBS for 4–6 hours at room temperature, primary antibodies for 4–6 days at 4°C, and secondary antibodies overnight at 4°C. Antibodies were diluted in blocking solution. The following antibodies were used: rat anti-mCherry (1:250, ThermoFisher M11217), Mouse anti-Parvalbumin (1:1000, Millipore MAB1572), Donkey anti-Rat-Alexa 594 (1:1000, Invitrogen), and Goat anti-Mouse-Alexa 633 (1:1000, Invitrogen). Neurotrace 435/455 (1:250, ThermoFisher N21479) was added to the secondary antibody solution. Sections were mounted and imaged on a Zeiss LSM 880 using a 20x objective in 425×425 μm tiles at 1024×1024-pixel identification.
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4

Expression and Characterization of KCNG4 Mutant

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A full-length human KCNG4 cDNA clone was purchased from Source bioscience (IRCMp5012B0629D) and cloned in-house into a pcDNA3 based expression plasmid (CMV-genex-polioIRESmCherry) both with or without a C-terminal HA tag. The p.Val419Met mutation was introduced by site-directed mutagenesis (Stratagene) according to the manufacturer’s protocols and sequences of the plasmids were confirmed by Sanger Sequencing. The clone expressing KV2.1 alongside a nuclear GFP reporter in the pCAGGS-IRES2-nucEGFP vector has been described previously (Saitsu et al., 2015 (link)) and was a kind gift from Prof. Hiromoto Saitsu.
Antibodies used were anti-HA mouse monoclonal (12B12, #MMS-101P, Biolegend), anti-Na+/K+ ATPase rabbit monoclonal (ab76020, Abcam), anti-mCherry rat monoclonal (M11217), anti-β-actin mouse monoclonal (a2228, Sigma), anti-KV2.1 rabbit polyclonal (APC-012, Alomone), anti-KV6.4 mouse monoclonal (N458/10, NeuroMab), anti-KV2.1 mouse monoclonal (K89/34, ab192761, Abcam), and anti-HA rabbit monoclonal (C29F4 #3724, Cell Signaling).
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5

RGC-Oligodendrocyte Co-culture Myelination

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Retinae were dissected from P6 Sprague-Dawley rat pups (AMPREP Animal Ethics Committee #E-1602/2015/M). RGCs were purified according to the published immunopanning protocol (Watkins et al., 2008 (link); Deliyanti and Wilkinson-Berka, 2015 (link)). Details of the RGC preparation are described in Supplemental Experimental Procedure. The RGC growth medium was changed every third day and cultures were maintained for 9 days. Pre-OLs from NKX2.1-GFP + cells at stage VI day 10, were FACS sorted according to O4 antibody labeling. O4 + sorted cells were then co-cultured with RGCs at a density of 20,000/well under 3 different conditions: T3 with 0.01% ethanol, 10 ng/mL DITPA, and 40 ng/mL T3 with DITPA in myelination medium (see Supplemental Experimental Procedure). The medium was changed every 3 days. At day 7, all co-cultures were fixed with 2% paraformaldehyde (PFA) for 10 min at room temperature. Cells were stained with a monoclonal rat anti-mCherry (Life Technologies, M11217, 1:1000); monoclonal mouse anti-NF-200 (Sigma-Aldrich, N0142, 1:200); and polyclonal rabbit anti-MBP (Millipore, AB980, 1:200). Subsequently cells were stained with appropriate Alexa Fluor-labeled secondary antibodies (Life technologies).
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6

Viral Expression Visualization in Mouse Brain

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To verify viral expression, mice were deeply anaesthetized with isoflurane and transcardially perfused with PBS, followed by fixation in cold 4% PFA solution for 48 h. Then the brain tissue was dissected and fixed in PFA overnight at 4 °C. The brain tissue was dehydrated in PBS solution containing 30% sucrose and then embedded in OCT freezing embedding solution. Coronal sections (30 μm) were cut on a Leica CM1860 UV freezing microtome (20 sections per brain). The brain slices were permeabilized in PBST for 20 min, subsequently blocked with 5% BSA in PBST for 1 h at room temperature, and then incubated with anti-mCherry (Thermo Fisher M11217,1:1000) and anti-Serotonin (Sigma–Aldrich s5545,1:2000) overnight at 4 °C. After washing with PBS for 10 min and PBST twice for 10 min each, brain slices were incubated in Alexa Fluor 568 Goat anti-Rat (Thermo Fisher, 1:400) and Alexa Fluor 488 Donkey anti-Rabbit (Jackson Labs, 1:200) for 3 h at room temperature. After washing 3 times with PBS for 10 min each, brain slices were sealed with anti-fading fluorescent mounting medium (Vectorlabs) overlay and subsequently imaged with a confocal microscope.
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