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Molecular Endocrinology, doi:10.1210/me.2003-0176
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Molecular Endocrinology 18 (6): 1428-1437
Copyright © 2004 by The Endocrine Society

Generation of Two Distinct Functional Isoforms of Dosage-Sensitive Sex Reversal-Adrenal Hypoplasia Congenita-Critical Region on the X Chromosome Gene 1 (DAX-1) by Alternative Splicing

Anwar Hossain, Chun Li and Grady F. Saunders

Department of Biochemistry and Molecular Biology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030-4009

Address all correspondence and requests for reprints to: Grady F. Saunders, Department of Biochemistry and Molecular Biology, Unit 117, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas 77030-4009. E-mail: gsaunders{at}mdanderson.org.

DAX-1 (dosage-sensitive sex reversal-adrenal hypoplasia congenita-critical region on the X chromosome gene 1; NR0B1) is an orphan nuclear receptor that plays an important role in the development and functioning of the adrenal gland and hypothalamic-pituitary gonadal axis. The DAX-1 protein acts as a transcriptional repressor of genes involved in the steroidogenic pathway. We have identified a novel isoform encoded by the known exon 1 of DAX-1 and a previously unrecognized exon (exon 2{alpha}) that lies within intron 1 of DAX-1. This novel transcript, which we designated DAX-1{alpha}, is terminated at exon 2{alpha}; the last 70 amino acids of the C-terminal repressor domain encoded by exon 2 are absent. DAX-1{alpha} encodes a protein of 401 amino acids; the first 389 amino acids are encoded by exon 1 and the last 12 are encoded by exon 2{alpha}. Using conventional RT-PCR and real-time RT-PCR analyses, we found that DAX-1{alpha} is abundantly expressed in the adrenal gland, brain, kidney, ovary, and testis. We also found that DAX-1{alpha} can bind to steroidogenic factor 1 and to DNA but is unable to repress steroidogenic factor 1-mediated transcriptional activation of the reporter gene and acts as an antagonist of DAX-1 under certain conditions.

NURSA Molecule Pages Link:

Nuclear Receptors:   DAX1  |  SF-1
Coregulators:   Alien  |  NCOR



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