hic2 Antibody

What is HIC2 and what cellular functions does it regulate?

HIC2 (Hypermethylated in Cancer 2) is a transcription factor that functions as a transcriptional repressor. It belongs to the POK family of proteins and shares structural similarities with the tumor suppressor HIC1, particularly in its BTB/POZ and zinc-finger domains . Functionally, HIC2 plays crucial roles in embryonic development, with particular importance in cardiac and circulatory system development through the suppression of fetal genes . HIC2 commonly functions within larger protein complexes that integrate signals affecting cellular response and proliferation . Loss of HIC2 has been associated with distal variants of 22q11 Deletion Syndrome, highlighting its importance in normal development .

What types of HIC2 antibodies are available for research applications?

Several types of HIC2 antibodies are currently available for research applications:

These antibodies vary in their production methods, applications, and specific binding characteristics, offering researchers options depending on their experimental needs .

What is the molecular weight of HIC2 protein and how is it detected?

The calculated molecular weight of HIC2 protein is 66 kDa, corresponding to a 615 amino acid sequence . This predicted weight matches the observed molecular weight in Western blot analyses . When using Western blot techniques to detect HIC2, researchers should expect to observe a band at approximately 66 kDa. For example, when using the ab167257 antibody at a concentration of 1 μg/mL on HIC2-transfected 293T cell lysates, the predicted 66 kDa band is visible, while it is absent in non-transfected control lysates . This confirms both the specificity of the antibody and the expected molecular weight of the target protein.

How should I optimize HIC2 antibody dilutions for different applications?

Optimizing antibody dilutions is critical for achieving specific signals while minimizing background. Based on validated protocols, the following dilution ranges are recommended for different applications:

It is highly recommended to perform preliminary titration experiments for each new cell line or tissue type to determine optimal conditions for your specific experimental system . Start with the middle of the recommended range and adjust based on signal-to-noise ratio.

What cell lines have been validated for HIC2 antibody applications?

Several cell lines have been validated for use with HIC2 antibodies across different applications:

When working with new cell lines, preliminary validation is recommended to ensure specificity and optimal signal . Different cell types may require adjusted protocols or antibody concentrations due to variations in HIC2 expression levels.

What are the best storage conditions for maintaining HIC2 antibody activity?

To maintain optimal activity, HIC2 antibodies should be stored according to manufacturer specifications. Most HIC2 antibodies are supplied in PBS with 0.02% sodium azide and 50% glycerol at pH 7.3 . The recommended storage temperature is -20°C, where they remain stable for approximately one year after shipment. Importantly, aliquoting is generally unnecessary for -20°C storage of these antibody preparations due to the glycerol content, which prevents freeze-thaw damage .

Some formulations (20μl sizes) may contain 0.1% BSA as a stabilizer . When handling antibodies, avoid repeated freeze-thaw cycles, minimize exposure to light, and avoid contamination. Always centrifuge briefly before opening vials to ensure all liquid is at the bottom of the tube.

How can I validate HIC2 antibody specificity for my experimental system?

Validating antibody specificity is crucial for generating reliable results. For HIC2 antibodies, implement the following validation strategies:

• Positive and negative controls: Use cell lines with known HIC2 expression (e.g., HepG2, Jurkat) as positive controls. For negative controls, consider using HIC2 knockdown/knockout systems or non-transfected cell lines when using transfection-based systems .

• Multiple detection methods: Confirm results using at least two different detection methods (e.g., Western blot and immunofluorescence) or different antibodies targeting distinct epitopes of HIC2 .

• Signal verification: Verify that the observed molecular weight matches the predicted weight of 66 kDa in Western blot applications .

• Knockdown validation: Perform siRNA or shRNA knockdown of HIC2 and confirm reduced signal intensity with the antibody. Published knockdown studies have utilized the 22788-1-AP antibody and can serve as reference protocols .

• Cross-reactivity assessment: If working with non-human samples, assess potential cross-reactivity or lack thereof, as most available HIC2 antibodies are primarily validated for human samples .

How can I use HIC2 antibodies for chromatin immunoprecipitation (ChIP) studies?

HIC2 functions as a transcriptional repressor, making ChIP studies particularly valuable for understanding its genomic targets. For ChIP applications:

What methodological approaches can resolve contradictory data when using different HIC2 antibodies?

When facing contradictory results between different HIC2 antibodies, systematic troubleshooting is essential:

• Epitope mapping: Determine which epitopes are recognized by each antibody. Different antibodies may target distinct regions of HIC2, potentially explaining discrepancies if certain domains are masked in specific contexts or if post-translational modifications affect epitope accessibility .

• Expression system comparison: Different antibodies may have been raised against different expression systems (bacterial vs. eukaryotic). Those raised against eukaryotic-expressed antigens may better recognize native conformations with appropriate post-translational modifications.

• Sequential immunoprecipitation: If two antibodies give contradictory results, perform sequential immunoprecipitation with both antibodies to determine if they recognize the same or distinct populations of HIC2 protein.

• Mass spectrometry validation: For definitive identification, immunoprecipitate HIC2 using both antibodies and analyze the precipitated proteins by mass spectrometry to confirm target identity and identify potential differences in interacting partners.

• Independent methodologies: Employ non-antibody-based approaches like CRISPR tagging of endogenous HIC2 with reporters (e.g., GFP) to validate antibody-based findings and resolve discrepancies.

How is HIC2 antibody used to study cardiac development and 22q11 Deletion Syndrome?

HIC2 plays crucial roles in cardiac development, and its loss is associated with distal variants of 22q11 Deletion Syndrome . Researchers can utilize HIC2 antibodies to:

• Developmental expression profiling: Track HIC2 protein expression across cardiac developmental stages using immunohistochemistry or immunofluorescence in embryonic tissues with antibodies like ab167257 or 83162-7-RR .

• Protein interaction networks: Identify HIC2 interaction partners in developing cardiac tissue using co-immunoprecipitation with 22788-1-AP, followed by mass spectrometry to identify novel cardiac-specific interactions .

• Genome-wide binding profiles: Generate ChIP-seq data using ChIP-certified antibodies like HPA059399 to map HIC2 binding sites throughout the genome in cardiac progenitors and identify direct target genes involved in heart development .

• Patient-derived models: Compare HIC2 expression and localization in patient-derived cells (from 22q11 Deletion Syndrome patients) versus controls using immunofluorescence to understand molecular mechanisms underlying the syndrome.

• Functional consequences: Correlate HIC2 binding patterns with gene expression changes in wild-type versus 22q11 Deletion models to establish functional consequences of HIC2 loss.

What are the methodological considerations for studying HIC2 in cancer research?

As implied by its name (Hypermethylated in Cancer 2), HIC2 may have roles in cancer development or progression. When investigating HIC2 in cancer contexts:

• Expression analysis across cancer types: Use Western blot with 22788-1-AP to quantitatively compare HIC2 expression across different cancer cell lines and matched normal tissues .

• Subcellular localization: Employ immunofluorescence with 83162-7-RR or ab167257 to determine whether HIC2 localization changes in cancer cells versus normal cells, as altered localization may indicate functional changes .

• Epigenetic regulation: Given its name, investigate the methylation status of HIC2 promoter in correlation with protein expression levels across cancer types.

• Functional studies: After knockdown or overexpression of HIC2 in cancer models, assess changes in proliferation, migration, invasion, and other cancer-relevant phenotypes, validating knockdown efficiency with HIC2 antibodies.

• Prognostic value assessment: Correlate HIC2 protein levels (determined by immunohistochemistry) with patient outcomes to evaluate potential prognostic value.

• Transcriptional targets: Identify cancer-specific transcriptional targets of HIC2 using ChIP-seq with HPA059399, focusing on genes involved in cancer pathways .

How can HIC2 antibodies be applied in single-cell analysis techniques?

Single-cell technologies offer new opportunities to understand HIC2 function at unprecedented resolution:

• Flow cytometry: The 83162-7-RR antibody has been validated for intracellular flow cytometry, enabling quantification of HIC2 protein levels at the single-cell level . Use the recommended concentration of 0.25 μg per 10^6 cells in a 100 μl suspension.

• Mass cytometry (CyTOF): Metal-conjugated HIC2 antibodies can be incorporated into CyTOF panels to simultaneously measure HIC2 expression alongside numerous other proteins at single-cell resolution.

• Single-cell Western blot: Apply microfluidic-based single-cell Western blot techniques using 22788-1-AP to quantify HIC2 protein levels in individual cells, revealing cell-to-cell variability .

• Imaging mass cytometry: Combine spatial information with single-cell protein quantification by using metal-labeled HIC2 antibodies for imaging mass cytometry of tissue sections.

• Multiplexed immunofluorescence: Combine HIC2 antibodies with antibodies against other proteins of interest in multiplexed immunofluorescence panels to reveal co-expression patterns at single-cell resolution.

What approaches enable studying HIC2 protein interactions and complex formation?

As HIC2 functions within larger protein complexes , studying these interactions is crucial:

• Co-immunoprecipitation: Use 22788-1-AP for immunoprecipitation followed by Western blot to detect known or suspected interaction partners .

• Proximity ligation assay (PLA): Combine HIC2 antibodies with antibodies against suspected interaction partners in PLA to visualize and quantify protein interactions in situ within cells.

• BioID or APEX proximity labeling: Fuse HIC2 to a biotin ligase (BioID) or APEX peroxidase, then use HIC2 antibodies to confirm proper expression and localization of the fusion protein before proximity labeling experiments.

• FRET/FLIM analysis: Use fluorescently labeled HIC2 antibodies in Förster Resonance Energy Transfer (FRET) or Fluorescence Lifetime Imaging Microscopy (FLIM) to study protein interactions in living cells.

• Protein complex immunoprecipitation: Use gentler lysis conditions and crosslinking approaches with 22788-1-AP to preserve and isolate intact HIC2-containing protein complexes for mass spectrometry analysis .