Genome-Wide Association Study of Body Size Traits in Luning Chickens Using Whole-Genome Sequencing

Area of Science:

• Animal Genetics
• Quantitative Genetics
• Poultry Science

Background:

• Growth traits are essential for poultry breeding and production efficiency.
• Marker-assisted selection (MAS) and genomic selection (GS) rely on accurate genetic markers for trait improvement.
• Understanding the genetic architecture of growth is key for advancing poultry breeding programs.

Purpose of the Study:

• To conduct a genome-wide association study (GWAS) in Luning chickens to identify genetic variations associated with body size traits.
• To pinpoint significant single-nucleotide polymorphisms (SNPs) and insertions/deletions (INDELs) influencing chicken growth and development.
• To identify candidate genes that could be targeted for selective breeding.

Main Methods:

• A genome-wide association study (GWAS) was performed on 248 Luning chickens.
• Analysis focused on identifying significant single-nucleotide polymorphisms (SNPs) and insertions and deletions (INDELs).
• Statistical methods were employed to associate genetic markers with body size traits.

Main Results:

• A total of 30 significant SNPs and 13 INDELs were identified for body size traits.
• Two chromosomal regions (chromosome 1: 43.072–43.219 Mb; chromosome 11: 4.751–4.800 Mb) showed significant associations with growth traits.
• Ten candidate genes, including PPFIA2, KITLG, DUSP6, TOX3, MTNR1B, FAT3, PTPRR, VEZT, BBS9, and CYLD, were identified as potentially important for chicken growth.

Conclusions:

• The study successfully identified significant genetic markers and candidate genes associated with growth traits in Luning chickens.
• These findings provide valuable insights into the genetic basis of chicken growth.
• The results support the application of genomic information for enhancing selective breeding strategies in poultry.