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The Scientific World Journal
Volume 2014 (2014), Article ID 639682, 7 pages
http://dx.doi.org/10.1155/2014/639682
Research Article

A Comparative Analysis of Synonymous Codon Usage Bias Pattern in Human Albumin Superfamily

1Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
2Allergy and Immunology Research Centre, Institute for Medical Research, Jalan Pahang, Kuala Lumpur, Malaysia
3Crystal, Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia

Received 25 November 2013; Accepted 11 January 2014; Published 20 February 2014

Academic Editors: Y. Lai, S. Ma, and Z. Su

Copyright © 2014 Hoda Mirsafian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Synonymous codon usage bias is an inevitable phenomenon in organismic taxa across the three domains of life. Though the frequency of codon usage is not equal across species and within genome in the same species, the phenomenon is non random and is tissue-specific. Several factors such as GC content, nucleotide distribution, protein hydropathy, protein secondary structure, and translational selection are reported to contribute to codon usage preference. The synonymous codon usage patterns can be helpful in revealing the expression pattern of genes as well as the evolutionary relationship between the sequences. In this study, synonymous codon usage bias patterns were determined for the evolutionarily close proteins of albumin superfamily, namely, albumin, -fetoprotein, afamin, and vitamin D-binding protein. Our study demonstrated that the genes of the four albumin superfamily members have low GC content and high values of effective number of codons (ENC) suggesting high expressivity of these genes and less bias in codon usage preferences. This study also provided evidence that the albumin superfamily members are not subjected to mutational selection pressure.