Genomic growth hormone gene polymorphisms in native Chinese chickens

Area of Science:

• Animal Genetics
• Molecular Biology
• Poultry Science

Background:

• Chicken growth hormone (cGH) regulates vital physiological functions including growth, body composition, and reproduction.
• Previous studies indicate associations between chicken growth hormone polymorphisms and specific phenotypes.
• Native Chinese chicken breeds represent a valuable genetic resource for agricultural research.

Purpose of the Study:

• To investigate the genetic polymorphism of the growth hormone (GH) gene in selected native Chinese chicken strains.
• To characterize the GH gene sequence and identify novel variations.
• To analyze the allele frequencies of intron 1 polymorphism across diverse native Chinese chicken populations.

Main Methods:

• DNA sequencing of the Yellow Wai Chow GH gene.
• Identification and characterization of genetic variations, including substitutions and insertions within introns.
• Novel Mspl site identification and characterization in the first intron.
• Allele frequency analysis of intron 1 polymorphism in 28 native Chinese chicken populations.

Main Results:

• The Yellow Wai Chow GH gene sequencing revealed one silent substitution, 31 insertions, and other intron substitutions.
• A novel Mspl recognition site was identified and characterized within the first intron of the cGH gene.
• Significant variations in intron 1 allele frequencies were observed among the 28 native Chinese chicken populations.

Conclusions:

• The characterized polymorphism in the chicken growth hormone (cGH) gene provides valuable genetic markers.
• GH gene polymorphism analysis can aid in phylogenetic studies of chicken populations.
• These genetic insights can inform the design of targeted breeding programs for native Chinese chickens.