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Molecular and Cellular Biology, July 2003, p. 4753-4763, Vol. 23, No. 14
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.14.4753-4763.2003

Variegated Expression from the Murine Band 3 (AE1) Promoter in Transgenic Mice Is Associated with mRNA Transcript Initiation at Upstream Start Sites and Can Be Suppressed by the Addition of the Chicken ß-Globin 5' HS4 Insulator Element

Tiffany F. Frazar,1,{dagger} Jessica L. Weisbein,1,{ddagger} Stacie M. Anderson,1 Amanda P. Cline,1 Lisa J. Garrett,2 Gary Felsenfeld,3 Patrick G. Gallagher,4 and David M. Bodine1*

Hematopoiesis Section, Genetics and Molecular Biology Branch,1 Transgenic Mouse Core Facility, Genetic Disease Research Branch, National Human Genome Research Institute,2 Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland,3 Department of Pediatrics, Yale University, New Haven, Connecticut4

Received 8 January 2003/ Returned for modification 24 March 2003/ Accepted 28 April 2003

The anion exchanger protein 1 (AE1; band 3) is an abundant erythrocyte transmembrane protein that regulates chloride-bicarbonate exchange and provides an attachment site for the erythrocyte membrane skeleton on the cytoplasmic domain. We analyzed the function of the erythroid AE1 gene promoter by using run-on transcription, RNase protection, transient transfection, and transgenic mouse assays. AE1 mRNA was transcribed at a higher level and maintained at a higher steady-state level than either ankyrin or ß-spectrin in mouse fetal liver cells. When linked to a human {gamma}-globin gene, two different AE1 promoters directed erythroid-specific expression of {gamma}-globin mRNA in 18 of 18 lines of transgenic mice. However, variegated expression of {gamma}-globin was observed in 14 of 18 lines. While there was a significant correlation between transgene copy number and the amount of {gamma}-globin mRNA in all 18 lines, the transgene mRNAs initiated upstream of the start site of the endogenous AE1 mRNA. Addition of the insulator element from 5'HS4 of the chicken ß-globin cluster to the AE1/{gamma}-globin transgene allowed position-independent, copy-number-dependent expression at levels similar to the AE1 transcription rate in six of six lines of transgenic mice. The mRNA from the insulated AE1/{gamma}-globin transgene mapped to the start site of the endogenous AE1 mRNA, and {gamma}-globin protein was expressed in 100% of erythrocytes in all lines. We conclude that the chicken ß-globin 5'HS4 element is necessary for full function of the AE1 promoter and that position effect variegation is associated with RNA transcription from the upstream start sites.

* Corresponding author. Mailing address: Hematopoiesis Section, GMBB, NHGRI, 49 Convent Dr., MSC 4442, Building 49, Rm. 3A14, Bethesda, MD 20892-4442. Phone: (301) 402-0902. Fax: (301) 402-4929. E-mail: tedyaz{at}nhgri.nih.gov.

{dagger} Present address: University of Vermont Medical School, Burlington, Vt.

{ddagger} Present address: University of Pennsylvania Medical School, Philadelphia, Pa.

Molecular and Cellular Biology, July 2003, p. 4753-4763, Vol. 23, No. 14
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.14.4753-4763.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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