Single linkage group per chromosome genetic linkage map for the horse, based on two three-generation, full-sibling, crossbred horse reference families.

The research presents a detailed genetic linkage map of the horse, featuring 742 markers, achieved through studying two three-generation full-sibling horse families. The generated map offers comprehensive insight into the genetic traits of horses, which can be beneficial in identifying traits of interest.

Objective

The primary objective of the study was to construct a detailed genetic linkage map of the horse. It involved the use of two three-generation full-sibling horse families, sired by the same stallion, to achieve an extensive understanding of the genetic traits of horses. The map constructed highlights promising potential for identifying and mapping traits of interest in horses.

Methodology

• The researchers used two three-generation full-sibling horse families, descended from the same stallion, including 61 individuals in the F2 generation for the study.
• The genetic study involved 742 markers, each assigned to a specific linkage group on the chromosomes. This included both the autosomes and the X chromosome.
• In addition to microsatellite markers, fluorescence in situ hybridization was used to determine orientation.

Results

• The 742 markers used for the genetic study included 734 microsatellite and 8 gene-based markers.
• Each linkage group was assigned to a chromosome and oriented with markers mapped by fluorescence in situ hybridization.
• The average interval between markers was 3.7 cM, with the linkage groups collectively spanning 2772 cM.

Comparative Mapping and Utility

• The researchers also enhanced the utility of the microsatellite markers for comparative mapping.
• This was made possible by comparing their flanking sequences with the human genome sequence, which enabled the identification of conserved segments between humans and horses.

Conclusion

The new linkage map created provides a valuable resource for genetic mapping of traits in horses. Through the use of a substantial number of markers and comparative mapping with the human genome, the research brings promising potential to better understand and identify specific genetic traits in horses.