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Molecular Biology and Evolution, Vol 2, 505-513, Copyright © 1985 by Society for Molecular Biology and Evolution

ORIGINAL ARTICLE

Concerted evolution of the cow epsilon 2 and epsilon 4 beta-globin genes

JC Schimenti and CH Duncan
Children's Hospital Research Foundation, Cincinnati, Ohio 45229.

The nucleotide sequences of the cow epsilon 2 and epsilon 4 globin genes were determined. The sequences were 95% identical. These genes arose via a four-gene block duplication that also gave rise to the bovine fetal (gamma) and adult (beta) genes. Their deduced amino acid sequences are unlike any previously reported fetal or adult globins; rather, comparison to other mammalian globin genes indicates that they are embryonic in nature. The sequence data indicate that these two genes have converted each other during evolution. Pairwise comparison to the corresponding goat genes shows greater similarity between paralogues than between more directly related orthologues. This is in direct contrast to the situation between the cow and goat fetal and adult genes. These observations suggest that the frequency of DNA conversion or the fixation of conversion events may vary in different locations of the cow beta-globin cluster.
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