Molecular Biology Reports

, Volume 40, Issue 4, pp 3437–3443 | Cite as

Cloning of TPO gene and associations of polymorphisms with chicken growth and carcass traits

  • Xinyan Hou
  • Ruili Han
  • Yadong Tian
  • Wanying Xie
  • Guirong Sun
  • Guoxi Li
  • Ruirui Jiang
  • Xiangtao Kang


Thyroid peroxidase (TPO), which located on the apical membrane surface of thyrocytes, is the key enzyme involved in thyroid hormone synthesis, mainly catalyses the iodination of tyrosine residues and the coupling of iodotyrosines on thyroglobulin to form thyroxine and triiodothyronine. The objectives of this study were to identify genetic polymorphisms of the chicken TPO gene and to analyze potential association between single nucleotide polymorphisms (SNPs) and growth and carcass traits in chicken. Partial sequences of TPO gene were cloned firstly. The nucleotide sequence was found to have 72 % identity with that of humans. The chicken TPO amino acid sequence was 71 %. Through polymerase chain reaction-restriction fragment length polymorphism and DNA sequencing methods, three novel mutations of the chicken TPO gene were detected in the F2 resource population from Gushi chickens and Anka broilers. The association analysis indicated that all of the three SNPs showed association with chicken growth at different periods. The g.29996C>T polymorphisms was significantly associated with body weight, breast bone length, pectoral angle at 12 weeks, claw weight and leg muscle weight (P < 0.05). In addition, individuals with the TT genotype had higher value for almost all the traits than CC and CT genotype. Meanwhile for CLW, the additive effects were significant (P < 0.05). Hence, we suggest that genotype TT can be regarded as a potential molecular marker for later growth and carcass traits in chicken.


Thyroid peroxidase gene Clone SNPs Chicken Growth traits Carcass traits Association analysis 



The work is supported by the National Natural Science Foundation of China (NO. 31072023; NO. 31101707) and the National Agricultural Science, Technology Achievements Transformation Foundation of China (NO. 2009GB2D000218), the Earmarked Fund for Modern Agro-industry Technology Research System (NO. CARS-41-K04).

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Xinyan Hou
    • 1
  • Ruili Han
    • 1
  • Yadong Tian
    • 1
  • Wanying Xie
    • 1
  • Guirong Sun
    • 1
  • Guoxi Li
    • 1
  • Ruirui Jiang
    • 1
  • Xiangtao Kang
    • 1
  1. 1.College of Animal Science and Veterinary MedicineHenan Agricultural University, Henan Innovative Engineering Research Center of Poultry Germplasm ResourceZhengzhouPeople’s Republic of China

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