Genomic Evidence for Independent Origins of Beta-like Globin Genes in Monotremes and Therian Mammals

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2008 Jan 25

PMID 18216242

Citations 38

Authors

Juan C Opazo

Federico G Hoffmann

Jay F Storz

Affiliations

Soon will be listed here.

Abstract

Phylogenetic reconstructions of the beta-globin gene family in vertebrates have revealed that developmentally regulated systems of hemoglobin synthesis have been reinvented multiple times in independent lineages. For example, the functional differentiation of embryonic and adult beta-like globin genes occurred independently in birds and mammals. In both taxa, the embryonic beta-globin gene is exclusively expressed in primitive erythroid cells derived from the yolk sac. However, the "epsilon-globin" gene in birds is not orthologous to the epsilon-globin gene in mammals, because they are independently derived from lineage-specific duplications of a proto beta-globin gene. Here, we report evidence that the early and late expressed beta-like globin genes in monotremes and therian mammals (marsupials and placental mammals) are the products of independent duplications of a proto beta-globin gene in each of these two lineages. Results of our analysis of genomic sequence data from a large number of vertebrate taxa, including sequence from the recently completed platypus genome, reveal that the epsilon- and beta-globin genes of therian mammals arose via duplication of a proto beta-globin gene after the therian/monotreme split. Our analysis of genomic sequence from the platypus also revealed the presence of a duplicate pair of beta-like globin genes that originated via duplication of a proto beta-globin gene in the monotreme lineage. This discovery provides evidence that, in different lineages of mammals, descendent copies of the same proto beta-globin gene may have been independently neofunctionalized to perform physiological tasks associated with oxygen uptake and storage during embryonic development.

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