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Journal of Endocrinology (2006) 190, 17-28       DOI: 10.1677/joe.1.06703
© 2006 Society for Endocrinology
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REVIEW

Evolution of glucocorticoid receptors with different glucocorticoid sensitivity

Ellen H Stolte1,2, B M Lidy Verburg van Kemenade2, Huub F J Savelkoul2 and Gert Flik1

1 Department of Animal Physiology, Radboud University, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
2 Cell Biology and Immunology Group, Wageningen University, Marijkeweg 40, 6709 PG, Wageningen, The Netherlands

(Requests for offprints should be addressed to G Flik; Email: g.flik{at}science.ru.nl)

Glucocorticoids (GCs) are commonly used to treat a variety of immune diseases. However, the efficacy of treatment is greatly influenced by an individual variation in sensitivity to GCs, which is caused by differences in the glucocorticoid receptor (GR). The variable receptor profile results from variations in the GR gene, or alternative splicing of the gene coded. We investigated the evolution of the GR gene by comparing genomic GR sequences of vertebrates. Exon length and amino acid sequence are conserved among all classes of vertebrates studied, which indicates strong evolutionary pressure on conservation of this gene. Interestingly, teleostean fishes have two different GR proteins. One of the duplicate fish GR genes has a nine-amino-acid insert in the DNA binding region that results from alternative splicing. The duplicate GR genes and products of alternative splicing in teleostean fishes are differentially expressed in vivo and show different transactivation capacity in vitro. The presence of two GR genes appears to be a result of divergence of receptors rather than of ligands. Teleostean fishes express different, evolutionarily related, functional GR proteins within a single organism. Hereby, teleostean fishes present a model that facilitates investigation of the molecular basis of cortisol resistance and different regulatory functions of cortisol.




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