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6 protocols using axioimager m1

1

Immunofluorescent Detection of 53BP1

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Cells were washed with PBS and fixed with 4% formaldehyde for 10 min at room temperature, permeabilized with 0.3% Triton X-100 in PBS for 5 min at room temperature and then blocked with 3% BSA/10% FBS in PBS for 1 h at room temperature. Samples were then incubated with rabbit anti-53BP1 overnight at 4°C, washed with 0.05% PBS-Tween20 and incubated with anti-rabbit IgG AlexaFluor 594 (Molecular Probes). DNA was counterstained with DAPI and images were acquired using a Zeiss AxioImager M1, using a Hamamatsu digital camera and the Volocity 4.3.2 software (Perkin Elmer).
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2

Immunofluorescent Detection of 53BP1

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Cells were washed with PBS and fixed with 4% formaldehyde for 10 min at room temperature, permeabilized with 0.3% Triton X-100 in PBS for 5 min at room temperature and then blocked with 3% BSA/10% FBS in PBS for 1 h at room temperature. Samples were then incubated with rabbit anti-53BP1 overnight at 4°C, washed with 0.05% PBS-Tween20 and incubated with anti-rabbit IgG AlexaFluor 594 (Molecular Probes). DNA was counterstained with DAPI and images were acquired using a Zeiss AxioImager M1, using a Hamamatsu digital camera and the Volocity 4.3.2 software (Perkin Elmer).
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3

Immunofluorescence Staining of HeLa and Flp-In T-REx 293 Cells

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HeLa Kyoto cells or Flp-In T-REx 293 cells were fixed and processed for immunofluorescence as described45 (link). In brief, cells were fixed in 4% paraformaldehyde for 10 min at the room temperature followed by ice-cold methanol for 1 min. The cells were then wash with 1 × phosphate-buffered saline (PBS) and permeabilized with 0.5% Triton X-100 for 5 min before antibody staining. The primary antibodies used were as follows: mouse anti-histone H2AX pSer139 (1:1,000, Millipore 05-636-1), mouse anti-α-tubulin (1:5,000, Sigma-Aldrich T9026), rabbit anti-GFP (1:5,000, Abcam ab290), mouse anti-cyclin A (1:200, Santa Cruz sc-56299), mouse anti-FLAG (1:1,000, Sigma-Aldrich A8592). Secondary antibodies conjugated to Alexa Fluor 488 and Alexa Fluor 555 (1:1,000, Molecular Probes) were used for detection. DNA was stained with 4,6-diamidino-2-phenylindole. Images were acquired using Zeiss AXIO Imager M1 with a × 40 EC-Plan-Neofluor lens and Hamamatsu photonics camera under the control of Volocity software. Images were processed using Adobe Photoshop.
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4

Immunofluorescence Imaging of Cell Markers

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HeLa Kyoto cells or Flp-In T-REx 293 cells were fixed and processed for immunofluorescence as described45 (link). In brief, cells were fixed in 4% paraformaldehyde for 10 min at the room temperature followed by ice-cold methanol for 1 min. The cells were then wash with 1xPBS and permeabilised with 0.5% Triton X-100 for 5 min before antibody staining. The primary antibodies used were: mouse anti-histone H2AX pSer139 (1:1000, Millipore 05-636-1), mouse anti-α-tubulin (1:5000, Sigma-Aldrich T9026), rabbit anti-GFP (1:5000, Abcam ab290), mouse anti-cyclin A (1:200, Santa Cruz sc-56299), mouse anti-FLAG (1:1000, Sigma-Aldrich A8592). Secondary antibodies conjugated to Alexa Fluor 488 and Alexa Fluor 555 (1:1000, Molecular Probes) were used for detection. DNA was stained with DAPI. Images were acquired using Zeiss AXIO Imager M1 with a 40x EC-Plan-Neofluor lens and Hamamatsu photonics camera under the control of Volocity software. Images were processed using Adobe Photoshop.
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5

Proximity Ligation Assay for RNAPII-PCNA Interaction

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Cells grown on coverslips were pre-extracted in 0.5% NP40 on ice for 4min then washed once with PBS an fixed with 4% formaldehyde in PBS for 15 min at room temperature, washed three times with PBS, blocked with 3% BSA/10% fetal bovine serum and incubated with antibodies mouse RNAPII 8WG16Pol 1:200 and rabbit PCNA 1:200 overnight at 4°C. PLA was performed following the manufacturer’s instructions using the Duolink anti-Mouse MINUS and anti-Rabbit PLUS In Situ PLA probes and the Duolink In Situ Detection Reagents Red (Olink Bioscience). Images were acquired using a Zeiss AxioImager M1, equipped with a Hamamatsu digital camera and the Volocity software (Perkin Elmer). PLA foci were analyzed using ImageJ (https://imagej.nih.gov/ij/).
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6

Imaging Biofilms in Microtiter Plates

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About 1 μl aliquots of media from 96-well plates were placed on glass microscope slides and imaged using a Zeiss AxioImager M1 with a Hamamatsu Orca 03 12-bit grayscale digital color camera. Images were taken at 40× and 100×. Nile Red was detected using the Texas Red filter. To image intact biofilms within each well in glass-bottom 96-well microtiter plates, we used a Zeiss AxioObserver Z1 Live-Cell system with a QImaging Retiga SRV and a QImaging 5MPix Micropublisher camera. Images were taken with a 0.01–0.05 s exposure time (depending on magnification) and analyzed using the Zeiss Axio Vision software.
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