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Molecular Endocrinology 11 (9): 1278-1290
Copyright © 1997 by The Endocrine Society

Identification of Transcripts Initiated from an Internal Promoter in the c-erbA{alpha} Locus That Encode Inhibitors of Retinoic Acid Receptor-{alpha} and Triiodothyronine Receptor Activities

Olivier Chassande1, Alexandre Fraichard1, Karine Gauthier, Frédéric Flamant, Claude Legrand, Pierre Savatier, Vincent Laudet and Jacques Samarut

Laboratoire de Biologie Moléculaire et Cellulaire (A.F., O.C., K.G., F.F., C.L., P.S., J.S.) Centre Nationale de la Recherche Scientifique UMR 49, Institut Nationale de la Recherche Agronomique LA 913 Ecole Normale Supérieure de Lyon 69364 Lyon Cedex 07, France
1 Unité d’Oncologie Moléculaire (V.L.) Institut Pasteur 59019 Lille, France

The thyroid hormone receptor-coding locus, c-erbA{alpha}, generates several mRNAs originating from a single primary transcript that undergoes alternative splicing. We have identified for the first time two new transcripts, called TR{Delta}{alpha}1 and TR{Delta}{alpha}2 [mRNA for isoform {alpha}1 and {alpha}2 of the T3 receptor (TR), respectively], whose transcription is initiated from an internal promoter located within intron 7 of the c-erbA{alpha} gene. These two new transcripts exhibit tissue-specific patterns of expression in the mouse. These two patterns are in sharp contrast with the expression patterns of the full-length transcripts generated from the c-erbA{alpha} locus. TR{Delta}{alpha}1 and TR{Delta}{alpha}2 mRNAs encode N-terminally truncated isoforms of T3R{alpha}1 and T3R{alpha}2, respectively. The protein product of TR{Delta}{alpha}1 antagonizes the transcriptional activation elicited by T3 and retinoic acid. This protein inhibits the ligand-induced activating functions of T3R{alpha}1 and 9-cis-retinoic acid receptor-{alpha} but does not affect the retinoic acid-dependent activating function of retinoic acid receptor-{alpha}. We predict that these truncated proteins may work as down-regulators of transcriptional activity of nuclear hormone receptors in vivo.




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