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Expression of two alternatively spliced forms of the 5' untranslated region of the GM-CSF receptor α chain mRNA

Chopra, R; Kendall, G; Gale, RE; Thomas, NSB; Linch, DC; (1996) Expression of two alternatively spliced forms of the 5' untranslated region of the GM-CSF receptor α chain mRNA. Experimental Hematology , 24 (6) pp. 755-762.

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Abstract

The granulocyte-macrophage colony-stimulating factor receptor (GM-CSFR) is composed of at least two chains (α and β). The a chain binds GM-CSF specifically with low affinity, and the binding is converted to high affinity when the α chain is associated with the β chain. To date, there are at least six isoforms described for the GM-CSFRα, all involving alternative splicing at the 3' end, which alters the coding region and hence the protein produced. To detect variants at the 5' end of the GM-CSFRα mRNA, RNAse protection and reverse transcriptase polymerase chain reaction (RT-PCR) assays were performed using a probe spanning nucleotides 102-392 and pairs of primers covering exons 1-4. In addition to the expected full-length transcript, two mRNAs were detected, one containing a deletion of 24 nucleotides by alternative splicing at the 3' end of exon 2 (exon 2b-deleted isoform) and another in which exon 2 was completely deleted (exon 2-deleted isoform). Together, the isoforms were more highly expressed than the full-length sequence (TF-1 cells: full-length 36 ± 2.8% vs. exon 2-deleted isoforms 64 ± 5.5%). These isoforms were detected in primary hematopoietic cells, blasts from patients with acute myeloid leukemia (AML), and malignant cell lines, and the relative mRNA expression for the isoforms was always similar to that of TF-1. cells. As sequences in the 5' untranslated region can be involved in the modulation of translational efficiency, translation of constructs corresponding to these exon 2-deleted isoforms was assessed using an in vitro reticulocyte lysate system. Deletion of exon 2 resulted in significantly lower in vitro translation of the receptor protein relative to the full-length sequence (53, 56, and 76% in three separate batches of reticulocytes), while deletion of exon 2b resulted in higher translation of the sequence (164, 128, and 305%; p = 0.01). These data suggest a mechanism by which expression of the GM-CSFRα protein may be regulated by alternatively spliced transcripts with different translational efficiencies.

Type: Article
Title: Expression of two alternatively spliced forms of the 5' untranslated region of the GM-CSF receptor α chain mRNA
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Haematology
URI: http://discovery.ucl.ac.uk/id/eprint/42245
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