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Two primate-specific small non-protein-coding RNAs in transgenic mice: neuronal expression, subcellular localization
Tasneem Khanam1, Timofey S Rozhdestvensky, Marsha Bundman
1Institute of Experimental Pathology (ZMBE), University of Münster, Von-Esmarch-Strasse 56, D-48149 Münster, Germany.
Nucleic Acids Research
|December 19, 2006
Summary
Two non-protein coding RNAs (npcRNAs), BC200 and G22, were studied in transgenic mice to understand their neuronal expression and function. Both npcRNAs were found to be expressed in the brain and transported to dendrites, suggesting conserved roles in primates.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Alu retroposon insertions can lead to the exaptation of genes, including those encoding non-protein coding RNAs (npcRNAs).
- BC200 RNA in anthropoid primates and G22 RNA in prosimians are examples of npcRNAs arising from independent Alu insertions at the same locus.
- Understanding the neuronal function of these npcRNAs is crucial for comprehending primate brain evolution.
Purpose of the Study:
- To investigate the neuronal expression patterns of BC200 and G22 npcRNAs in a mammalian model.
- To identify protein binding partners of BC200 and G22 npcRNAs.
- To explore the potential conserved functions of these independently exapted npcRNAs.
Main Methods:
- Generation of transgenic mice carrying BC200 and G22 genes with flanking sequences.
- Analysis of npcRNA expression in transgenic mouse brains using techniques to assess gene expression and localization.
- Biochemical analysis to identify ribonucleoprotein (RNP) complexes formed by the npcRNAs.
Main Results:
- Transgenic BC200 and G22 genes were expressed in mouse brain regions analogous to human expression patterns.
- Expression of the G22 gene was dependent on upstream regulatory sequences, not just internal promoters.
- Both BC200 and G22 RNAs were transported into neuronal dendrites and formed RNP complexes with poly(A) binding protein and SRP9/14.
Conclusions:
- Independently exapted npcRNAs, BC200 and G22, exhibit conserved neuronal expression and dendritic transport in a mouse model.
- The identified protein partners suggest a potential shared function in translational regulation of dendritic protein synthesis.
- These findings support the hypothesis of similar functional roles for BC200 and G22 npcRNAs in primate neuronal biology.
