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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
Published on: August 21, 2014
Ythdf is a N6-methyladenosine reader that modulates Fmr1 target mRNA selection and restricts axonal growth in
Lina Worpenberg1, Chiara Paolantoni1, Sara Longhi2
1Center for Integrative Genomics, Génopode Building, Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.
Abstract:
N6-methyladenosine (m6 A) regulates a variety of physiological processes through modulation of RNA metabolism. This modification is particularly enriched in the nervous system of several species, and its dysregulation has been associated with neurodevelopmental defects and neural dysfunctions. In Drosophila, loss of m6 A alters fly behavior, albeit the underlying molecular mechanism and the role of m6 A during nervous system development have remained elusive. Here we find that impairment of the m6 A pathway leads to axonal overgrowth and misguidance at larval neuromuscular junctions as well as in the adult mushroom bodies. We identify Ythdf as the main m6 A reader in the nervous system, being required to limit axonal growth. Mechanistically, we show that the m6 A reader Ythdf directly interacts with Fmr1, the fly homolog of Fragile X mental retardation RNA binding protein (FMRP), to inhibit the translation of key transcripts involved in axonal growth regulation. Altogether, this study demonstrates that the m6 A pathway controls development of the nervous system and modulates Fmr1 target transcript selection.
Insights
The N6-methyladenosine (m6 A) pathway controls nervous system development by limiting axonal growth. This RNA modification pathway interacts with Fmr1 to regulate gene translation, impacting neural development.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- N6-methyladenosine (m6 A) is a crucial RNA modification involved in various physiological processes.
- m6 A is abundant in the nervous system, and its dysregulation is linked to neurodevelopmental and neural disorders.
- The precise role and molecular mechanisms of m6 A in nervous system development remain largely unknown.
Purpose of the Study:
- To elucidate the function of the m6 A pathway in Drosophila nervous system development.
- To identify the key m6 A 'reader' protein responsible for mediating m6 A's effects in the fly nervous system.
- To investigate the molecular interactions and mechanisms by which m6 A influences neural development.
Main Methods:
- Analysis of m6 A pathway mutants in Drosophila.
- Assessment of axonal morphology at larval neuromuscular junctions and adult mushroom bodies.
- Identification and characterization of m6 A reader proteins in the fly nervous system.
- Investigation of protein-protein interactions between m6 A readers and Fmr1.
- Analysis of translational regulation of target transcripts.
Main Results:
- Impairment of the m6 A pathway results in axonal overgrowth and misguidance in Drosophila.
- Ythdf is identified as the primary m6 A reader in the fly nervous system, essential for restricting axonal growth.
- Ythdf directly interacts with Fmr1 to suppress the translation of transcripts regulating axonal growth.
- The m6 A pathway modulates the selection of Fmr1 target transcripts.
Conclusions:
- The m6 A RNA modification pathway plays a critical role in controlling nervous system development in Drosophila.
- Ythdf acts as a key mediator, linking m6 A modification to the regulation of axonal growth via Fmr1.
- This study reveals a novel mechanism by which RNA modifications influence neural development and gene expression regulation.
