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The HLA-A mutation assay: improved technique and normal results.
M A McCarron1, A Kutlaca, A A Morley
1Department of Haematology, Flinders Medical Centre, Bedford Park, South Australia.
Mutation Research
|April 1, 1989
Summary
The modified HLA-A assay enhances mutant lymphocyte detection. Elderly individuals show a significantly higher mutant frequency compared to younger adults, indicating age-related changes in immune cells.
Area of Science:
- Immunogenetics
- Cellular and Molecular Immunology
Background:
- The Human Leukocyte Antigen (HLA)-A assay is crucial for detecting mutant lymphocytes.
- Previous methods required optimization for improved immunoselection.
Purpose of the Study:
- To report modifications to the HLA-A assay, enhancing its sensitivity.
- To investigate in vivo mutant frequencies in lymphocytes across different age groups.
Main Methods:
- Incorporation of an overnight incubation step into the HLA-A assay.
- Enumeration of HLA-A2 and HLA-A3 mutants in lymphocytes.
- Comparison of mutant frequencies with the hypoxanthine phosphoribosyl transferase (HPRT) locus.
Main Results:
- The modified assay demonstrated improved immunoselection.
- In vivo mutant frequencies in normal young adults (mean age 35) were 2.99 x 10^-5.
- Elderly individuals (mean age 78) exhibited significantly higher mutant frequencies (7.16 x 10^-5).
Conclusions:
- The enhanced HLA-A assay provides a more sensitive method for detecting mutant lymphocytes.
- Aging is associated with a substantial increase in in vivo lymphocyte mutation frequency.
- The higher mutant frequency at the HLA-A locus compared to HPRT is likely influenced by factors beyond genetic instability.