Molecular Evolution in the Hypervariable Regions of Fetuin: Comparison between Human and African Green Monkey Fetuin
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K. Yoshida
Abstract
Sequences of fetuin cDNA and its deduced amino acid residues from the African green monkey cell line Vero were found to differ by 7.3% and 12.9%, respectively, from the corresponding human sequences. Most amino acid substitutions were clustered within a small segment of the third domain (D3). Calculations of nonsynonymous and synonymous nucleotide substitution rates suggest that this small segment was mutated under positive selection. cDNAs encoding α1-antitrypsin, β-actin and the sequences of intron 4 of α1-antitrypsin gene in human liver and Vero cells were also investigated. The results substantiated the positive selection imposed on the D3 segment.
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