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Harlequin colour in the Great Dane dog
1Department of Agricultural Zoology and Genetics, University College, Dublin, Ireland.
Genetica
|January 1, 1988
Summary
The harlequin coat color in Great Danes results from a dominant gene (H) interacting with the merle gene (M). Homozygous HH is lethal, and H+M interactions reduce viability in white merles.
Area of Science:
- Genetics
- Animal breeding
- Canine coat color genetics
Background:
- The harlequin coat pattern in Great Danes is a distinctive trait.
- Previous hypotheses suggested a genetic basis involving dominant and merle genes.
- Understanding the genetics of coat color is crucial for breed management.
Purpose of the Study:
- To confirm the genetic hypothesis for the harlequin coat pattern in Great Danes.
- To investigate the interaction between the H and M genes.
- To analyze the viability of dogs with specific gene combinations.
Main Methods:
- Analysis of breeding data from Great Britain and Eire.
- Genotype-phenotype correlation for coat color.
- Evaluation of gene interactions and their effects on viability.
Main Results:
- The harlequin pattern is confirmed to be caused by the H+M+ genotype.
- The dominant H gene modifies the merle (M) gene's blue coloration to white.
- Homozygous HH is a prenatal lethal, and H+M interactions reduce viability in H+MM genotypes.
Conclusions:
- The genetic model for harlequin Great Danes is validated.
- The H gene plays a critical role in modifying coat color and affecting viability.
- Further research into gene interactions can inform breeding strategies for Great Danes.