Anti-Histone H2A.X antibody - ChIP Grade (ab20669)

Lanes 1 - 3: Merged signal (red and green). Green - ab20669 observed at 17 kDa. Red - loading control, ab9484, observed at 37 kDa.

ab20669 was shown to recognize Histone H2A.X in wild-type HAP1 cells as signal was lost at the expected MW in H2AFX (Histone H2A.X) knockout cells. Additional cross-reactive bands were observed in the wild-type and knockout cells. Wild-type and H2AFX (Histone H2A.X) knockout samples were subjected to SDS-PAGE. Ab20669 and ab9484 (Mouse anti-GAPDH loading control) were incubated overnight at 4°C at 1 μg/ml and 1/20000 dilution respectively. Blots were developed with Goat anti-Rabbit IgG H&L (IRDye^® 800CW) preabsorbed ab216773 and Goat anti-Mouse IgG H&L (IRDye^® 680RD) preabsorbed ab216776 secondary antibodies at 1/20000 dilution for 1 hour at room temperature before imaging.

Chromatin was prepared from HeLa cells according to the Abcam X-ChIP protocol. Cells were fixed with formaldehyde for 10 minutes. The ChIP was performed with 25µg of chromatin, 2µg of ab20669 (blue), and 20µl of Protein A/G sepharose beads. No antibody was added to the beads control (yellow). The immunoprecipitated DNA was quantified by real time PCR (Taqman approach for active and inactive loci, Sybr green approach for heterochromatic loci). Primers and probes are located in the first kb of the transcribed region.

IHC image of ab20669 staining Histone H2A.X in human colon formalin fixed paraffin embedded tissue sections, performed on a Leica Bond. The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH6, epitope retrieval solution 1) for 20 mins. The section was then incubated with ab20669, 0.5µg/ml, for 15 mins at room temperature and detected using an HRP conjugated compact polymer system. DAB was used as the chromogen. The section was then counterstained with haematoxylin and mounted with DPX. No primary antibody was used in the negative control (shown on the inset).

For other IHC staining systems (automated and non-automated) customers should optimize variable parameters such as antigen retrieval conditions, primary antibody concentration and antibody incubation times.

ab20669 staining Histone H2A.X in Mouse brain neurone cells by ICC/IF (Immunocytochemistry/immunofluorescence). Cells were fixed with paraformaldehyde, permeabilized with 0.3% Triton X-100 and blocked with 5% serum for 2 hours at 22°C. Samples were incubated with primary antibody (1/500 in 2.5% serum + 0.3% Triton X-100 in PBS) for 24 hours at 4°C. ab175651, an Alexa Fluor® 405-conjugated Donkey anti-rabbit IgG polyclonal (1/500) was used as the secondary antibody.

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IHC image of Histone H2A.X staining in Human Lung formalin fixed paraffin embedded tissue section, performed on a Leica Bond™ system using the standard protocol F. The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH6, epitope retrieval solution 1) for 20 mins. The section was then incubated with ab20669, 0.2 µg/ml, for 15 mins at room temperature and detected using an HRP conjugated compact polymer system. DAB was used as the chromogen. The section was then counterstained with haematoxylin and mounted with DPX.

For other IHC staining systems (automated and non-automated) customers should optimize variable parameters such as antigen retrieval conditions, primary antibody concentration and antibody incubation times.

See Abreview