FAM127B Antibody

What is FAM127B and how does it relate to other family members?

FAM127B (also known as CXX1B, MAR8A, RTL8A, or SIRH6) belongs to the FAM127 family, which includes three members: FAM127A (RTL8C, CXX1), FAM127B, and FAM127C (RTL8B, CXX1C). All three members consist of 113 amino acids and share extremely high sequence similarity (>95%). They are located on chromosomes, and their specific functions remain largely unknown. FAM127B is predicted to be active in the nucleolus .

What are the molecular characteristics of the FAM127B protein?

FAM127B has a calculated molecular weight of 13 kDa, although the observed molecular weight in Western blot analysis is typically around 18 kDa. This discrepancy between calculated and observed molecular weights may be due to post-translational modifications. The protein consists of 113 amino acids and is considered a retrotransposon Gag-like protein .

What types of FAM127B antibodies are available for research applications?

FAM127B antibodies are available in several formats:

• Polyclonal antibodies: Generated in rabbits and purified through affinity purification

• Monoclonal antibodies: Produced from specific hybridoma clones

• Recombinant antibodies: Engineered for enhanced specificity and consistency

Each type offers distinct advantages depending on your experimental requirements. Polyclonal antibodies typically provide broader epitope recognition, while monoclonal and recombinant antibodies offer higher specificity and batch-to-batch consistency.

How should I validate a FAM127B antibody before use in my experiments?

Proper validation should include:

• Positive control testing: Use recommended positive control cell lines such as PC-3, HeLa, HepG2, or L929 cells, which are known to express FAM127B

• Application-specific validation:

  • For Western blot: Verify the observed molecular weight matches the expected size (approximately 13-18 kDa)

  • For immunofluorescence: Confirm expected subcellular localization (nucleolar pattern)

  • For immunoprecipitation: Validate with known expressing cell lines like PC-3 cells

• Cross-reactivity assessment: Since FAM127 family members share high sequence similarity, determine if your antibody recognizes all family members or is specific to FAM127B

What are the optimal conditions for Western blot analysis using FAM127B antibodies?

Based on validated protocols from multiple sources, consider the following parameters:

For optimal results, perform a titration experiment with different antibody dilutions to determine the ideal concentration for your specific sample and experimental conditions .

How should I perform immunofluorescence/immunocytochemistry experiments with FAM127B antibodies?

For successful IF/ICC experiments:

• Sample preparation: Fix cells with 4% paraformaldehyde and permeabilize with 0.1% Triton X-100

• Antibody dilution: Use 1:50-1:100 for polyclonal antibodies or 1:125-1:500 for recombinant antibodies

• Secondary antibody: Apply fluorophore-conjugated secondary antibodies (e.g., Cy3-conjugated anti-rabbit IgG at 1:500 dilution)

• Nuclear counterstain: Use DAPI for nuclear visualization

• Validated cell lines: HepG2 cells and L929 cells have been confirmed to work well in IF/ICC applications

• Expected pattern: FAM127B should show a predominantly nucleolar localization pattern

How can I distinguish between FAM127B and other FAM127 family members in my experiments?

This is a challenging aspect of FAM127B research, as the family members share >95% sequence homology. Consider these approaches:

• Sequence analysis: Review the immunogen sequence of your antibody and compare with all three family members to assess potential cross-reactivity

• Combined approaches: Use multiple detection methods (e.g., Western blot plus IF/ICC) to verify results

• Knockout/knockdown controls: Include genetic manipulation controls specific to FAM127B to confirm antibody specificity

• Isoform-specific regions: Target antibodies raised against regions with amino acid differences between family members

• Mass spectrometry validation: For critical experiments, confirm protein identity through mass spectrometry after immunoprecipitation

Note that many commercially available antibodies may detect all FAM127 family members due to high sequence homology .

What are common issues with FAM127B antibodies and how can they be resolved?

What recent publications have used FAM127B antibodies in significant research?

Several recent publications have utilized FAM127B antibodies:

• Harihar Milaganur Mohan (PMID: 35247097) employed Western blot techniques in a Cell Molecular Life Sciences publication

• Alexandra M. Whiteley (PMID: 33277362) used immunoprecipitation methods with FAM127 antibodies in the Journal of Biological Chemistry

• Harihar M. Mohan (ID: 39484508) utilized FAM127 antibodies in research published as a preprint on bioRxiv

These publications suggest ongoing research interest in FAM127B, though specific functions remain under investigation.

What are considerations for using FAM127B antibodies in emerging research applications?

As research on FAM127B progresses, consider these advanced applications:

• Single-cell analysis: FAM127B antibodies may be adapted for single-cell Western blot or CyTOF analysis to examine cell-to-cell variation in expression

• Chromatin immunoprecipitation (ChIP): Though not yet widely validated, researchers interested in nucleolar functions might explore ChIP applications

• Proximity labeling techniques: Consider using FAM127B antibodies in conjunction with BioID or APEX2 to identify proximal interaction partners

• Super-resolution microscopy: Given the nucleolar localization, super-resolution techniques could provide insights into subnucleolar distribution

• Patient-derived samples: When using FAM127B antibodies on clinical samples, extensive validation using appropriate controls is essential

When adapting FAM127B antibodies to these emerging techniques, preliminary validation with established applications (WB, IF) is strongly recommended.