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A linkage group composed of three coat color genes and three serum protein loci in horses
Insights
Researchers studied equine coat color genes, chestnut (e) and roan (Rn), finding linkage to serum albumin (Al) and esterase (Es) loci. This establishes a new equine linkage group involving coat color and protein genes.
Area of Science:
- Genetics
- Animal Science
- Equine Genetics
Background:
- Understanding equine coat color inheritance is crucial for breed characterization and genetic studies.
- Previous research has identified several coat color genes in horses, but their precise linkage relationships are not fully established.
Purpose of the Study:
- To investigate the genetic linkage between the equine coat color genes chestnut (e) and roan (Rn) and various protein and blood group loci.
- To establish a more comprehensive equine gene linkage map.
Main Methods:
- Testing the linkage of chestnut (e) and roan (Rn) genes with 15 protein and blood group loci in horses.
- Analyzing segregation data to determine genetic distances and order.
Main Results:
- Demonstrated close linkage between chestnut (e) and roan (Rn) genes and the serum albumin locus (Al).
- Showed loose linkage between chestnut (e) and roan (Rn) genes and the serum esterase locus (Es).
- Established a linkage group including three coat color genes (To, e, Rn) and three serum protein loci (Al, Gc, Es) with a tentative gene order: Al, Gc, Rn, To-e-Es.
Conclusions:
- The results contribute to understanding coat color inheritance in horses and suggest homology with similar gene linkages in mice and rabbits.
- Electrophoretic markers can be valuable tools for testing allelism hypotheses in coat color genetics.
- Proposed designations for known autosomal linkage groups in horses.
Abstract:
The equine coat color genes chestnut (e) and roan (Rn) have been tested for linkage to 15 protein and blood group loci. Data showing close or fairly close linkage to the serum albumin locus (Al) and loose linkage to the serum esterase locus (Es) for both e and Rn are presented. This means that three coat color genes (To, e and Rn) and three serum protein loci (Al, Gc, and Es) are linked in the same linkage group. The gene order can tentatively be written Al, Gc, Rn, To-e-Es. The implications of the results for studies on coat color inheritance in horses are discussed. The possibility of using electrophoretic markers when testing hypotheses of allelism between coat color genes is suggested. The linkage of e and Es in the horse is proposed to be homologous to the loose linkage of the extension locus (e) and a cluster of esterase loci on chromosome 8 in the mouse, and on linkage group IV in the rabbit. Designations for the known autosomal linkage groups in the horse are suggested.