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Annexin A2 ( ANXA2 ) is a member of the A subfamily of a multifunctional calcium dependent membrane phospholipid binding protein family. The mRNA expression of  ANXA2  is consistent with ovary function and egg laying in chickens. In this study, six nucleotide polymorphisms in the key promoter region of chicken  ANXA2  gene (−2861   bp to −1394   bp), i.e.,: g.−2337 indel (GT), g.−2255 C   &gt;   T, g. −2248   A   &gt;   G, g.−2188 A   &gt;   G, g.−2169 G   &gt;   A, g.−2160 A   &gt;   C, were identified. Their distributions in populations of Xinyang Brown, Recessive White Rock, Wenchang and Wenshang Barred chickens were analyzed. In the Recessive White Rock chicken population,  CAA ,  CAG  and  TGG  were three major haplotypes. Association analysis indicated that the individuals with diplotype  TGG / TGG  laid more eggs at 32   weeks, and the individual with diplotype  CAG / TGG  laid at the earlier age. Luciferase activity assay showed that mutation from  C  to  T  at −2255 increased trascriptional activity of chicken  ANXA2 , which is consistent with its effect on egg laying traits.

Identification of nucleotide polymorphisms in the key promoter region of chicken annexins A2 gene associatied with egg laying traits