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Hou VC, Lersch R, Gee SL, Ponthier JL, Lo AJ, Wu M, Turck CW, Koury M, Krainer AR, Mayeda A, Conboy JG. Decrease in hnRNP A/B expression during erythropoiesis mediates a pre-mRNA splicing switch. EMBO J 2002; 21:6195-204. [PMID: 12426391 PMCID: PMC137214 DOI: 10.1093/emboj/cdf625] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
A physiologically important alternative pre-mRNA splicing switch, involving activation of protein 4.1R exon 16 (E16) splicing, is required for the establishment of proper mechanical integrity of the erythrocyte membrane during erythropoiesis. Here we identify a conserved exonic splicing silencer element (CE(16)) in E16 that interacts with hnRNP A/B proteins and plays a role in repression of E16 splicing during early erythropoiesis. Experiments with model pre-mRNAs showed that CE(16) can repress splicing of upstream introns, and that mutagenesis or replacement of CE(16) can relieve this inhibition. An affinity selection assay with biotinylated CE(16) RNA demonstrated specific binding of hnRNP A/B proteins. Depletion of hnRNP A/B proteins from nuclear extract significantly increased E16 inclusion, while repletion with recombinant hnRNP A/B restored E16 silencing. Most importantly, differentiating mouse erythroblasts exhibited a stage-specific activation of the E16 splicing switch in concert with a dramatic and specific down-regulation of hnRNP A/B protein expression. These findings demonstrate that natural developmental changes in hnRNP A/B proteins can effect physiologically important switches in pre-mRNA splicing.
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Affiliation(s)
| | | | | | | | | | - Michael Wu
- Lawrence Berkeley National Laboratory, Life Sciences Division and
Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, CA 94720, University of California, San Francisco, HHMI, Department of Medicine and Cardiovascular Research Institute, San Francisco, CA 94143, Department of Medicine, Vanderbilt University, Veterans Affairs Medical Centers, Nashville, TN 37232, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724 and University of Miami School of Medicine, Department of Biochemistry and Molecular Biology, Miami, FL 33136, USA Corresponding author e-mail:
| | - Chris W. Turck
- Lawrence Berkeley National Laboratory, Life Sciences Division and
Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, CA 94720, University of California, San Francisco, HHMI, Department of Medicine and Cardiovascular Research Institute, San Francisco, CA 94143, Department of Medicine, Vanderbilt University, Veterans Affairs Medical Centers, Nashville, TN 37232, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724 and University of Miami School of Medicine, Department of Biochemistry and Molecular Biology, Miami, FL 33136, USA Corresponding author e-mail:
| | - Mark Koury
- Lawrence Berkeley National Laboratory, Life Sciences Division and
Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, CA 94720, University of California, San Francisco, HHMI, Department of Medicine and Cardiovascular Research Institute, San Francisco, CA 94143, Department of Medicine, Vanderbilt University, Veterans Affairs Medical Centers, Nashville, TN 37232, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724 and University of Miami School of Medicine, Department of Biochemistry and Molecular Biology, Miami, FL 33136, USA Corresponding author e-mail:
| | - Adrian R. Krainer
- Lawrence Berkeley National Laboratory, Life Sciences Division and
Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, CA 94720, University of California, San Francisco, HHMI, Department of Medicine and Cardiovascular Research Institute, San Francisco, CA 94143, Department of Medicine, Vanderbilt University, Veterans Affairs Medical Centers, Nashville, TN 37232, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724 and University of Miami School of Medicine, Department of Biochemistry and Molecular Biology, Miami, FL 33136, USA Corresponding author e-mail:
| | - Akila Mayeda
- Lawrence Berkeley National Laboratory, Life Sciences Division and
Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, CA 94720, University of California, San Francisco, HHMI, Department of Medicine and Cardiovascular Research Institute, San Francisco, CA 94143, Department of Medicine, Vanderbilt University, Veterans Affairs Medical Centers, Nashville, TN 37232, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724 and University of Miami School of Medicine, Department of Biochemistry and Molecular Biology, Miami, FL 33136, USA Corresponding author e-mail:
| | - John G. Conboy
- Lawrence Berkeley National Laboratory, Life Sciences Division and
Department of Molecular and Cellular Biology, University of California at Berkeley, Berkeley, CA 94720, University of California, San Francisco, HHMI, Department of Medicine and Cardiovascular Research Institute, San Francisco, CA 94143, Department of Medicine, Vanderbilt University, Veterans Affairs Medical Centers, Nashville, TN 37232, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724 and University of Miami School of Medicine, Department of Biochemistry and Molecular Biology, Miami, FL 33136, USA Corresponding author e-mail:
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