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Subnucleosome structures as substrates in enzyme-linked immunosorbent assays.
1W.M. Keck Autoimmune Disease Center, Research Institute of Scripps Clinic, La Jolla, CA 92037.
Journal of Immunological Methods
|December 5, 1990
Summary
This study developed novel histone-DNA and histone-histone complex substrates for enzyme-linked immunosorbent assays. These substrates enable precise characterization of anti-histone antibodies, aiding in disease diagnostics.
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- Histones are crucial for DNA packaging and chromatin structure.
- Anti-histone antibodies are biomarkers for certain autoimmune diseases.
- Characterizing antibody specificity requires well-defined antigen substrates.
Purpose of the Study:
- To develop and validate histone complexes as substrates for enzyme-linked immunosorbent assays (ELISAs).
- To assess the suitability of these substrates for detecting anti-histone antibodies.
- To enable the study of antibody reactivity against specific histone quaternary structures.
Main Methods:
- Isolation and reconstitution of histone-histone and histone-DNA complexes.
- Optimization of antigen coating and quantification using micro-bicinchoninic acid assay.
- Assessment of DNA content via anti-native DNA antibody binding.
- Testing with prototype sera to evaluate assay reproducibility and bias.
Main Results:
- Reproducible and unique reactivity patterns were observed with prototype sera.
- Two substrates, H2A-H2B dimer and H2A-H2B-DNA complex, showed random orientation on the solid phase.
- Various epitopes were accessible for antibody binding.
Conclusions:
- A novel set of histone antigens preserving structural integrity was established.
- These antigens facilitate the definition of anti-histone antibody specificity based on chromatin quaternary structure.
- The assay platform shows promise for improved diagnostics in autoimmune diseases.