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Neuronal MAP2 mRNA: species-dependent differential dendritic targeting competence
Massimiliano Cristofanilli1, Solon Thanos, Jürgen Brosius
1Department of Physiology and Pharmacology, State University of New York, Health Science Center at Brooklyn, 11203, USA.
Journal of Molecular Biology
|August 27, 2004
Summary
Dendritic RNA targeting, crucial for neuronal plasticity, evolved recently. Avian MAP2 mRNA lacks dendritic targeting competence, unlike mammalian counterparts, suggesting a recent evolutionary acquisition of this trait.
Area of Science:
- Neuroscience
- Evolutionary Biology
- Molecular Biology
Background:
- Local protein synthesis in dendrites, facilitated by RNA transport, underpins long-term neuronal plasticity.
- Dendritic RNA targeting mechanisms are hypothesized to provide evolutionary advantages for complex neural systems.
Purpose of the Study:
- To investigate the evolutionary timeline of dendritic RNA targeting competence.
- To examine the dendritic targeting competence of Microtubule-Associated Protein 2 (MAP2) transcripts across different species.
Main Methods:
- In vivo analysis of somato-dendritic distribution of MAP2 transcripts in chicken, mouse, and rat.
- Identification of dendritic targeting elements (DTEs) within the 3' untranslated region (UTR) of MAP2 mRNA.
Main Results:
- Rodent MAP2 mRNAs are highly enriched in dendritic regions, while chicken MAP2 transcripts are primarily confined to neuronal somata.
- Avian MAP2 mRNA lacks a functional DTE homologous to the mammalian MAP2 DTE in its 3' UTR.
Conclusions:
- Avian MAP2 mRNA does not possess dendritic targeting competence, contrasting with mammalian MAP2 transcripts.
- The acquisition of dendritic targeting competence for MAP2 transcripts appears to be a relatively recent evolutionary event.