To uncover a diversity of genetic and biological unknowns, a comprehensive and comparative proteomic analysis is performed on egg albumen of domestic chicken, duck, goose, turkey, quail, and pigeon with tandem mass tags quantification technology. In this study, a total of 148, 138, 150, 162, 183, and 179 proteins are identified in egg albumen of the above six species, respectively. Venn plots, PCA, and cluster analysis all reveal the highest similarity of protein composition between duck and goose (≈75%). Additionally, the six species have 52 proteins detected in common in the egg albumen. As revealed by GO and pathway analyses, the plausible functions of these highly conserved proteins are to provide a secure environment and prevent the early death of embryonic cells. Species-specific proteins such as haptoglobin in pigeon, serpin-like protein HMSD in duck, and ovodefensin in chicken are also screened and are likely associated with species-dependent biological processes. Furthermore, Enzyme Code analysis indicated egg albumen have abundant enzyme activity, with hydrolases accounting for more than half of the total enzymes. This study is the first to provide the proteome profiles of egg albumen for the major poultry species, which will be instructive for the understanding of species-specific biological problems with egg albumen.

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