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Endocrinology Vol. 142, No. 5 1923-1934
Copyright © 2001 by The Endocrine Society

ARTICLES

Organization and Evolution of the Human Growth Hormone Receptor Gene 5'-Flanking Region1

C. G. Goodyer2, G. Zogopoulos3, G. Schwartzbauer3, H. Zheng, G. N. Hendy2 and R. K. Menon

Departments of Pediatrics (C.G.G., G.Z., H.Z., G.N.H.), Medicine (C.G.G., G.Z., H.Z., G.N.H.), Human Genetics (G.N.H.), and Physiology (G.N.H.), McGill University, Montréal, Québec, Canada H3Z 2Z3; and Department of Pediatrics, University of Pittsburgh School of Medicine, Children’s Hospital of Pittsburgh (G.S., R.K.M.), Pittsburgh, Pennsylvania 15213-2583

Address all correspondence and requests for reprints to: Dr. Cynthia G. Goodyer, McGill University-Montreal Children’s Hospital Research Institute, 4th Floor, Place Toulon, Room 415/1, 4060 St. Catherine Street West, Westmount, Québec, Canada H3Z 2Z3. E-mail: cindy.goodyer{at}muhc.mcgill.ca

Previous studies have identified eight variant human GH receptor (hGHR) messenger RNA (mRNAs; V1–V8), that differ in their 5'-untranslated regions (5'UTRs) but splice into the same site just upstream of the translation start site in exon 2; thus, they encode the same protein. Here we report a novel variant, V9, and describe the mapping of all nine 5'UTR sequences within 40 kb upstream of exon 2. A cluster of three sequences, V2-V9-V3 (termed module A), lies furthest 5', and approximately 16 kb downstream is a second cluster of four exons, V7-V1-V4-V8 (module B). V6 is midway between modules A and B. Module B is about 18 kb upstream of V5, which lies adjacent to exon 2. hGHR expression is under developmental- and tissue-specific regulation, and expression of the variant mRNAs is related to their position within the 5'-flanking region; whereas module A (V2,V9,V3) and V5 variants are widely expressed, module B (V7,V1,V4,V8) and V6 variant mRNAs are detectable only in postnatal liver. Transcriptional start sites for V1 and V9 (representing the two different modules) were identified, showing that postnatal liver-specific expression of V1 is driven from two TATA boxes, whereas the ubiquitous V9 transcript has a single start site and a TATA-less promoter. V9 promoter activity was shown by in vivo and in vitro transfection assays, and an NF-Y binding site was demonstrated by electromobility shift assay. Thus, the regulatory regions of the hGHR gene are complex, and the clustering of seven 5'UTR exons within two modules with distinctly different mRNA expression patterns is the most striking feature.




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