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Molecular evolution in the hypervariable regions of fetuin: comparison between human and African green monkey fetuin
K Yoshida1, Y Suzuki, K Yamamoto
1Department of Biochemistry, Kinki University School of Medicine, Osaka-Sayama, Osaka, Japan.
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 alpha1-antitrypsin, beta-actin and the sequences of intron 4 of alpha1-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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