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Myoglobin polymorphism in the pollan (Osteichthyes: Coregoninae)
Animal Blood Groups and Biochemical Genetics
|January 1, 1975
Summary
Genetic analysis of Irish pollan (Coregonus pollan) revealed three myoglobin phenotypes controlled by two alleles. Allele frequencies were consistent across isolated lakes, with a notable excess of heterozygotes suggesting balanced polymorphism.
Area of Science:
- * Population genetics
- * Molecular evolution
- * Fish biology
Background:
- * Myoglobin is a crucial protein for oxygen transport in muscle tissue.
- * Electrophoretic analysis is a common method for studying protein polymorphism.
- * Understanding genetic diversity in fish populations is vital for conservation and evolutionary studies.
Purpose of the Study:
- * To investigate the genetic basis of myoglobin variation in the Irish pollan (Coregonus pollan).
- * To determine allele frequencies and heterozygote excess in geographically isolated populations.
- * To assess the mode of inheritance and potential selective pressures maintaining myoglobin polymorphism.
Main Methods:
- * Electrophoretic separation of myoglobin from heart and lateral line muscle tissue.
- * Analysis of myoglobin phenotypes to infer genotypes.
- * Statistical analysis of allele frequencies and Hardy-Weinberg equilibrium.
Main Results:
- * Identified three distinct electrophoretically separable myoglobin phenotypes in Irish pollan.
- * Demonstrated that this polymorphism is controlled by two co-dominant alleles.
- * Observed virtually identical allele frequencies in two lakes isolated since the last Ice Age, with a significant excess of heterozygotes in both.
Conclusions:
- * The observed myoglobin polymorphism in Irish pollan is likely balanced.
- * Heterozygote superiority is proposed as the mechanism maintaining this genetic variation.
- * This finding provides insights into the evolutionary dynamics of isolated fish populations.
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