Genome-wide association study on chicken carcass traits using sequence data imputed from SNP array.

Area of Science:

• Animal Genetics
• Agricultural Science
• Genomics

Background:

• Chicken carcass traits are crucial for the poultry industry, making genetic improvement a key objective.
• Understanding the genetic basis of traits like carcass weight is essential for enhancing chicken production.

Purpose of the Study:

• To investigate the genetic mechanisms underlying chicken carcass traits through a genome-wide association study (GWAS).
• To identify specific genes and genetic markers associated with carcass weight and related traits in Chinese indigenous chickens.

Main Methods:

• Phenotyping 435 Chinese indigenous chickens for carcass weight (CW), eviscerated weight with giblets (EWG), and eviscerated weight (EW).
• Genotyping using a 600K SNP array and imputation to whole-genome sequence data.
• Performing univariate GWAS using GEMMA software on imputed sequence data.

Main Results:

• Identified 3, 25, and 63 suggestively significant SNPs associated with CW, EWG, and EW, respectively.
• Detected six candidate genes: RNF219, SCEL, MYCBP2, ETS1, APLP2, and PRDM10.
• SCEL and MYCBP2 showed potential associations with all three traits; other genes were linked to specific traits.

Conclusions:

• This GWAS provides valuable insights into the genetic architecture of chicken carcass traits.
• The identified genes and SNPs contribute to the knowledge base for genetic selection and breeding programs in poultry.
• The study successfully pinpointed candidate genes and validated previously reported QTLs, enhancing understanding of chicken meat production genetics.