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Related Experiment Video

Updated: Jul 5, 2026

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Human complement components C4A and C4B genetic diversities: complex genotypes and phenotypes.

Erwin K Chung¹, Yee Ling Wu, Yan Yang

¹Columbus Children's Research Institute and The Ohio State University, Columbus, Ohio, USA.

Current Protocols in Immunology

|April 25, 2008

Summary

This study details methods to genotype and phenotype human complement C4A and C4B genes. These techniques accurately quantify gene copy number, identify C4A/C4B alleles, and assess C4 protein levels, aiding in understanding genetic contributions to complement deficiencies.

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Last Updated: Jul 5, 2026

High-resolution Melting PCR for Complement Receptor 1 Length Polymorphism Genotyping: An Innovative Tool for Alzheimer's Disease Gene Susceptibility Assessment

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Published on: July 18, 2017

Measuring Erythrocyte Complement Receptor 1 Using Flow Cytometry

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Published on: May 19, 2020

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

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Published on: March 10, 2021

Area of Science:

Immunogenetics
Molecular Biology
Human Genetics

Background:

The human complement system, particularly C4A and C4B, plays a crucial role in innate immunity.
Accurate genotyping and phenotyping of C4 genes are essential for understanding their contribution to various diseases.
Existing methods may lack the precision to fully resolve C4 gene copy number, structure, and functional variants.

Purpose of the Study:

To describe precise methods for determining the genotypes and phenotypes of human complement components C4A and C4B.
To enable quantification of C4 gene copy number (C4A vs. C4B) within a diploid human genome.
To provide strategies for assessing C4 gene haplotypes, polymorphisms, and their association with C4 protein levels.

Main Methods:

Development of molecular assays for accurate C4 gene copy number determination.
Genotyping strategies to differentiate C4A and C4B gene products.
Methods to identify C4 gene haplotypes and their configuration within the Major Histocompatibility Complex (MHC).
Assessment of C4 protein polymorphism and correlation with gene dosage and potential mutations.

Main Results:

Establishment of methods for precise quantification of C4A and C4B gene copies in diploid genomes.
Characterization of strategies for determining C4 gene haplotypes and their arrangement.
Ability to assess C4 protein polymorphism and link low C4 levels to gene dosage or mutations.
Insights into the genetic basis of C4 deficiency and related immune dysregulation.

Conclusions:

The described methods provide a comprehensive toolkit for analyzing C4A and C4B genetic variation.
These techniques facilitate a deeper understanding of the genetic architecture of the human C4 locus.
The findings contribute to diagnosing and understanding diseases associated with C4 gene defects and complement deficiencies.