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Para-albumin polymorphism: an unlinked two-locus system in rainbow trout
The Journal of Heredity
|January 1, 1981
Summary
A new polymorphic protein system, para-albumin (PALB), in rainbow trout is controlled by two independent loci. These loci are located on duplicate chromosomes, suggesting a past tetraploidization event in the species.
Area of Science:
- Aquaculture
- Genetics
- Biochemistry
Background:
- Rainbow trout (Oncorhynchus mykiss) exhibit genetic diversity crucial for selective breeding.
- Understanding protein polymorphism aids in population genetics and evolutionary studies.
Purpose of the Study:
- To describe a novel polymorphic protein system, para-albumin (PALB), in rainbow trout.
- To determine the genetic control and chromosomal location of the PALB system.
Main Methods:
- Electrophoretic analysis of para-albumin in 20 full-sib families.
- Differential staining techniques to assess protein structure and allelic expression.
- Segregation analysis to determine genetic control and linkage.
Main Results:
- Para-albumin (PALB) polymorphism is controlled by two independent loci (PALB-1,2).
- The PALB protein is monomeric, with two alleles at each locus.
- Alleles at both loci share identical electrophoretic mobilities, and loci are unlinked.
Conclusions:
- The PALB-1 and PALB-2 loci are situated on duplicate chromosomes.
- The genetic architecture suggests retention of integrity since a tetraploidization event in rainbow trout evolution.