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Related Experiment Video

Updated: Mar 18, 2026

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A Major Locus for Quantitatively Measured Shank Skin Color Traits in Korean Native Chicken.

S Jin1, J H Lee1, D W Seo1

  • 1Division of Animal and Dairy Science, Chungnam National University, Deajeon 34134, Korea.

Asian-Australasian Journal of Animal Sciences
|July 8, 2016
PubMed
Summary

Researchers identified a major genetic locus, beta-carotene dioxygenase 2 (BCDO2), on chromosome 24 that significantly influences Korean native chicken shank skin color. This finding advances understanding of quantitative trait genetics in poultry.

Keywords:
BCDO2Korean Native ChickenLinkage and AssociationQuantitative Trait LocusShank Skin Color

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Area of Science:

  • Animal Genetics
  • Quantitative Trait Loci (QTL) Analysis
  • Poultry Genomics

Background:

  • Korean native chicken (KNC) exhibits diverse shank skin coloration, unlike the typically yellow European breeds.
  • Shank skin color is a complex trait influenced by multiple genetic factors.
  • Understanding the genetic basis of KNC shank color can aid in breed characterization and genetic improvement.

Purpose of the Study:

  • To identify quantitative trait loci (QTL) associated with measured shank skin color traits (lightness, redness, yellowness) in Korean native chickens.
  • To investigate the role of the beta-carotene dioxygenase 2 (BCDO2) gene in determining KNC shank skin color.

Main Methods:

  • Genome-wide scan linkage analysis was performed on 585 KNC progeny from 68 families using 167 DNA markers.
  • Multipoint variance-component QTL analyses were conducted using the SOLAR program.
  • Association tests (Measured Genotype Association and Quantitative Transmission Disequilibrium Test) were used to evaluate the association of BCDO2 variants with skin color traits.

Main Results:

  • A major QTL significantly associated with yellowness (b*) and redness (a*) of shank skin was detected on chicken chromosome 24 (GGA24).
  • The positional candidate gene, beta-carotene dioxygenase 2 (BCDO2), showed strong associations with both a* and b* values, particularly the g.9367 A>C variant.
  • Conditional linkage analyses suggested the presence of additional functional variants influencing shank skin color on GGA24.

Conclusions:

  • This study provides the first evidence for linkage and association between the BCDO2 locus on GGA24 and quantitative shank skin color traits in Korean native chickens.
  • The BCDO2 gene is a key determinant of shank skin pigmentation variation in KNC.
  • Further research is warranted to identify other functional variants contributing to shank skin color diversity in KNC.