Ubiquitous, but variable, expression of two alternatively spliced mRNAs encoding mouse homologues of transcription factors E47 and E12
Copyright policy )Ubiquitous, but variable, expression of two alternatively spliced mRNAs encoding mouse homologues of transcription factors E47 and E12
Two basic helix-loop-helix (bHLH) transcription factors, E47 and E12, are involved in cell-specific gene expression as part of dimeric complexes which interact with the cis-acting motif E-box. Although both generated from a single gene (E2A) by means of alternative splicing, the structural difference in these bHLH regions between the two suggests that the two bHLH proteins may differ in some of their functions. As a step toward elucidating the individual implications of E47 and E12, we investigated the mRNA expression ratios of their homologues (A1 and kA1, respectively) in mouse tissues and cell lines. Both the A1 and kA1 mRNAs were ubiquitously expressed in all tissues examined. However, their ratios varied: e.g., skeletal muscle, 2.2 +/- 0.3 (mean +/- SE); spleen, 2.0 +/- 0.2; pancreatic islet cells, 1.2 +/- 0.2. The A1/kA1 ratios in the cell lines investigated were similar to those of their original tissues. In conclusion, the ubiquity in mRNA expression observed for both the E47 and E12 homologues in mouse provides support for their involvement in a broad range of transcriptional regulation. The variation in the A1/kA1 expression ratios, on the other hand, supports the idea that A1 (E47) and kA1 (E12) each have some unique roles in the functions of these E2A gene-encoded bHLH proteins.
- Osaka University Japan
Mice, Inbred BALB C, DNA, Complementary, Base Sequence, Helix-Loop-Helix Motifs, Molecular Sequence Data, Transcription Factor 7-Like 1 Protein, Nucleic Acid Hybridization, Polymerase Chain Reaction, Cell Line, DNA-Binding Proteins, Alternative Splicing, Mice, Organ Specificity, Animals, Amino Acid Sequence, RNA, Messenger, Cloning, Molecular, TCF Transcription Factors, Transcription Factors
Mice, Inbred BALB C, DNA, Complementary, Base Sequence, Helix-Loop-Helix Motifs, Molecular Sequence Data, Transcription Factor 7-Like 1 Protein, Nucleic Acid Hybridization, Polymerase Chain Reaction, Cell Line, DNA-Binding Proteins, Alternative Splicing, Mice, Organ Specificity, Animals, Amino Acid Sequence, RNA, Messenger, Cloning, Molecular, TCF Transcription Factors, Transcription Factors
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