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C4 allotyping on plasma or serum: application to routine laboratories
W J Zhang1, P H Kay, T J Cobain
1Department of Clinical Immunology, Royal Perth Hospital, Queen Elizabeth II Medical Centre, Western Australia.
Human Immunology
|March 1, 1988
Summary
This study introduces a new method for typing C4 allotypes using carboxypeptidase B and neuraminidase. This technique improves accuracy and allows analysis of stored plasma or serum samples.
Area of Science:
- Immunogenetics
- Complement system biology
- Molecular diagnostics
Background:
- Complement component 4 (C4) allotypes are crucial genetic markers.
- Current methods using neuraminidase (NAse) on EDTA plasma have limitations in resolving overlapping bands.
Purpose of the Study:
- To evaluate the utility of adding carboxypeptidase B (CPseB) to NAse treatment for C4 allotyping.
- To assess the feasibility of using stored heparinized plasma or serum for C4 allotype determination.
Main Methods:
- Electrophoresis and immunofixation of C4 allotypes.
- Comparative analysis of NAse treatment versus combined CPseB + NAse treatment.
- Evaluation of C4 allotyping in stored heparinized plasma and serum.
Main Results:
- Combined CPseB + NAse treatment resolves each C4 allele into a single band, improving resolution over NAse alone.
- C4 allotypes can be reliably determined from stored heparinized plasma or serum.
- Most C4 null alleles are identifiable without necessitating family studies.
Conclusions:
- The CPseB + NAse method enhances C4 allotype resolution and expands sample compatibility.
- This refined approach is suitable for routine implementation in clinical and research settings.
- The method facilitates more accurate genetic typing and null allele identification.