Journal of Veterinary Medical Science
Online ISSN : 1347-7439
Print ISSN : 0916-7250
Wildlife Science
Dioxin Sensitivity-Related Two Critical Amino Acids of Arylhydrocarbon Receptor May Not Correlate with the Taxonomy or Phylogeny in Avian Species
Nozomi FUJISAWAYusuke K. KAWAIShouta M. M. NAKAYAMAYoshinori IKENAKAHideaki YAMAMOTOMayumi ISHIZUKA
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Volume 75 (2013) Issue 12 Pages 1577-1583

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Abstract

There are two arylhydrocarbon receptor (AhR) isoforms in birds, AhR1 and AhR2. The varying sensitivity of AhR is reported to be related to two critical amino acids at positions 325 and 381 in the AhR1 ligand-binding domain. In this study, seven avian species whose in vivo dioxin sensitivity was known, and 13 species with no data regarding their in vivo dioxin sensitivity were examined. The two critical amino acids in the ligand-binding domain were investigated in avian species, and the results were compared with the taxonomy or phylogenetic trees for the bird AhR proteins. We found that the two critical amino acids did not correlate with the taxonomy or phylogeny of these proteins, suggesting that dioxin sensitivity was independent of taxonomy.

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