Chicken microsatellite primers are not efficient markers for Japanese quail

Area of Science:

• Avian genetics
• Comparative genomics
• Poultry breeding

Background:

• Domestic fowl (Gallus gallus) and Japanese quail (Coturnix japonica) are agriculturally important poultry species within the Phasianidae family.
• Establishing a high-resolution comparative genetic map for Phasianidae requires marker information exchange between species, particularly chicken and quail.
• Microsatellite markers are valuable tools for genetic mapping due to their polymorphism and abundance.

Purpose of the Study:

• To evaluate the suitability of chicken microsatellite markers for genetic linkage mapping in Japanese quail.
• To assess the potential for cross-species marker utility in constructing a comparative genetic map for Phasianidae.

Main Methods:

• Tested 120 chicken microsatellite primers for amplification in Japanese quail.
• Assessed polymorphism in amplified loci.
• Sequenced informative polymorphic loci and compared them to orthologous chicken regions.
• Estimated allele frequencies for successful cross-species markers in a quail population.

Main Results:

• 26% of chicken primers amplified loci in quail, with 65% of these being polymorphic.
• Nine polymorphic loci were identified as informative, with six showing high similarity to chicken orthologous regions.
• Only a small subset of chicken microsatellite markers demonstrated utility in Japanese quail.

Conclusions:

• While a few chicken markers can serve as anchor points for comparative mapping, most are not transferable to quail.
• Significant effort should focus on developing quail-specific microsatellite markers for effective genetic studies and mapping.
• The limited cross-species utility highlights challenges in building comparative genetic maps between closely related avian species.