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Structure of the differentially expressed mouse U3A gene
1Centre de Recherche de Biochimie et de Génétique Cellulaires du CNRS, Université Paul-Sabatier, Toulouse, France.
European Journal of Biochemistry
|May 1, 1992
Summary
Mouse U3A and U3B RNA variants exhibit distinct gene structures and regulatory elements. These differences, conserved across species, suggest specific roles in differential gene expression for these essential small nuclear RNAs.
Area of Science:
- Molecular Biology
- Genetics
- RNA Biology
Background:
- Two distinct forms of U3 RNA (U3A and U3B) exist in mice, with tissue-specific abundance.
- U3B is encoded by four known genes, while the U3A variant's gene was previously uncharacterized.
Purpose of the Study:
- To isolate and analyze the unique gene encoding the mouse U3A RNA variant.
- To complete the characterization of the mouse U3 multigene family.
- To compare mouse U3A and U3B genes with their rat counterparts to understand evolutionary divergence.
Main Methods:
- Gene isolation and sequence analysis.
- Comparative genomic analysis between mouse and rat U3 genes.
- Structural and sequence motif comparison of U3A and U3B genes.
Main Results:
- The gene for the U3A variant was identified, completing the mouse U3 multigene family characterization.
- Diversification of U3A and U3B forms predates mouse-rat divergence.
- While primary and secondary structures are similar, flanking sequences, particularly 5' regions, show significant divergence and conservation patterns between mouse and rat, suggesting regulatory roles.
- Specific differences in conserved transcriptional control motifs between U3A and U3B genes are maintained across rodents.
Conclusions:
- The mouse U3 multigene family is fully characterized with the identification of the U3A gene.
- Evolutionary divergence of U3A and U3B forms occurred before rodent speciation.
- Distinct flanking sequences and regulatory motifs in U3A and U3B genes likely mediate their differential expression patterns.