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Hemoglobins From Bacteria to Man: Evolution of Different Patterns of Gene Expression

Hardison, Ross·1998·Journal of Experimental Biology
DOI 10.1242/jeb.201.8.1099
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Abstract

The discovery of hemoglobins in virtually all kingdoms of organisms has shown (1) that the ancestral gene for hemoglobin is ancient, and (2) that hemoglobins can serve additional functions besides transport of oxygen between tissues, ranging from intracellular oxygen transport to catalysis of redox reactions. These different functions of the hemoglobins illustrate the acquisition of new roles by a pre-existing structural gene, which requires changes not only in the coding regions but also in the regulatory elements of the genes. The evolution of different regulated functions within an ancient gene family allows an examination of the types of biosequence data that are informative for various types of issues. Alignment of amino acid sequences is informative for the phylogenetic relationships among the hemoglobins in bacteria, fungi, protists, plants and animals. Although many of these diverse hemoglobins are induced by low oxygen concentrations, to date none of the molecular mechanisms for their hypoxic induction shows common regulatory proteins; hence, a search for matches in non-coding DNA sequences would not be expected to be fruitful. Indeed, alignments of non-coding DNA sequences do not reveal significant matches even between mammalian α- and β-globin gene clusters, which diverged approximately 450 million years ago and are still expressed in a coordinated and balanced manner. They are in very different genomic contexts that show pronounced differences in regulatory mechanisms. The α-globin gene is in constitutively active chromatin and is encompassed by a CpG island, which is a dominant determinant of its regulation, whereas the β-globin gene is in A+T-rich genomic DNA. Non-coding sequence matches are not seen between avian and mammalian β-globin gene clusters, which diverged approximately 250 million years ago, despite the fact that regulation of both gene clusters requires tissue-specific activation of a chromatin domain regulated by a locus control region. The cis-regulatory sequences needed for domain opening and enhancement do show common binding sites for transcription factors. In contrast, alignments of non-coding sequences from species representing multiple eutherian mammalian orders, some of which diverged as long as 135 million years ago, are reliable predictors of novel cis-regulatory elements, both proximal and distal to the genes. Examples include a potential target for the hematopoietic transcription factor TAL1.

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Authors
Hardison, R.
Affiliations
Department of Biochemistry and Molecular Biology and the Center for Gene Regulation, The Pennsylvania State University, University Park, PA 16802, USA
Venue
Journal of Experimental Biology
Publisher
The Company of Biologists
Published
1998-04-01
Volume
201
Issue
8
Pages
1099-1117
ISSN
  • 0022-0949
  • 1477-9145
DOI
10.1242/jeb.201.8.1099
Cited by
277
References
0
Language
en
Licence
www.biologists.com/user-licence-1-1/ (vor)

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