Genetic polymorphism of the sixth component (C6) of rat complement

Area of Science:

• Immunogenetics
• Molecular Biology
• Animal Genetics

Background:

• The complement system plays a crucial role in innate and adaptive immunity.
• Genetic variations in complement proteins can influence immune responses and disease susceptibility.
• Complement protein 6 (C6) is a key component of the terminal complement pathway.

Purpose of the Study:

• To investigate the genetic polymorphism of complement protein C6 in rats.
• To determine the inheritance pattern of C6 variants.
• To assess the genetic linkage of C6 to other known marker genes in the rat genome.

Main Methods:

• Isoelectric focusing of plasma samples from 19 inbred rat strains.
• Electrophoretic analysis to identify distinct C6 migration patterns.
• Breeding studies using BN and DA rat strains to analyze inheritance.
• Backcross mating analysis to compare C6 allele distribution with eight marker genes (RT1.A, RT2, Gdc-1, Igk-1, Hbb, Svp-1, Fh-1, Es-6).

Main Results:

• Two electrophoretically distinguishable C6 migration patterns were identified, each with three bands.
• C6 patterns segregated as co-dominant autosomal traits, indicating two alleles: C6 A and C6 B.
• No detectable genetic linkage was observed between the C6 locus and the eight marker genes studied.

Conclusions:

• Complement protein C6 is genetically polymorphic in rats, determined by two co-dominant autosomal alleles.
• The C6 locus is not linked to the investigated marker genes RT1.A, RT2, Gdc-1, Igk-1, Hbb, Svp-1, Fh-1, and Es-6.
• These findings contribute to the understanding of rat immunogenetics and genome mapping.