Journal of Molecular Evolution

, Volume 29, Issue 4, pp 344–354

Amphibian albumins as members of the albumin, alpha-fetoprotein, vitamin D-binding protein multigene family

  • Denise Nardelli Haefliger
  • John E. Moskaitis
  • Daniel R. Schoenberg
  • Walter Wahli
Article

DOI: 10.1007/BF02103621

Cite this article as:
Haefliger, D.N., Moskaitis, J.E., Schoenberg, D.R. et al. J Mol Evol (1989) 29: 344. doi:10.1007/BF02103621

Summary

TheXenopus laevis 68-kd and 74-kd albumin amino acid sequences are examined with respect to their relationship to the other known members of the albumin/α-fetoprotein/vitamin D-binding protein gene family. Each of the three members of this family presents a unique pattern of conserved regions indicating a differential selective pressure related to specific functional characteristics. Furthermore, an evolutionary tree of these genes was deduced from the divergence times calculated from direct nucleotide sequence comparisons of individual gene pairs. These calculations indicate that the vitamin D-binding protein/albumin separation occurred 560–600 million years (Myr) ago and the albumin/α-fetoprotein divergence 280 Myr ago. This observation leads to the hypothesis according to which the albumin/α-fetoprotein gene duplication occurred shortly after the amphibian/reptile separation. Consequently, and unlike mammals, amphibians and fishes should lack anα-fetoprotein in their serum at larval stages, which is consistent with a recent analysis of serum proteins inXenopus laevis larvae. This hypothesis now will have to be tested further in additional lower vertebrates.

Key words

Xenopus laevis Gene families Evolutionary tree Albumin/α-fetoprotein/vitamin D-binding protein Percent corrected divergence Molecular clocks Sequence homology 

Copyright information

© Springer-Verlag New York Inc. 1989

Authors and Affiliations

  • Denise Nardelli Haefliger
    • 1
  • John E. Moskaitis
    • 2
  • Daniel R. Schoenberg
    • 2
  • Walter Wahli
    • 1
  1. 1.Institut de Biologie animaleUniversité de Lausanne, Bâtiment de BiologieLausanneSwitzerland
  2. 2.Department of PharmacologyUniformed Services University of the Health SciencesBethesdaUSA

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