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Mutations in the Profilin 1 Gene Cause Familial Amyotrophic Lateral Sclerosis

Amyotrophic lateral sclerosis (ALS) is a late-onset neurodegenerative disorder resulting from motor neuron death. Approximately 10% of cases are familial (FALS), typically with a dominant inheritance mode. Despite numerous advances in recent years(1-9), nearly 50% of FALS cases have unknown genetic...

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Detalles Bibliográficos
Autores principales: Wu, Chi-Hong, Fallini, Claudia, Ticozzi, Nicola, Keagle, Pamela J., Sapp, Peter C., Piotrowska, Katarzyna, Lowe, Patrick, Koppers, Max, McKenna-Yasek, Diane, Baron, Desiree M., Kost, Jason E., Gonzalez-Perez, Paloma, Fox, Andrew D., Adams, Jenni, Taroni, Franco, Tiloca, Cinzia, Leclerc, Ashley Lyn, Chafe, Shawn C., Mangroo, Dev, Moore, Melissa J., Zitzewitz, Jill A., Xu, Zuo-Shang, van den Berg, Leonard H., Glass, Jonathan D., Siciliano, Gabriele, Cirulli, Elizabeth T., Goldstein, David B., Salachas, Francois, Meininger, Vincent, Rossoll, Wilfried, Ratti, Antonia, Gellera, Cinzia, Bosco, Daryl A., Bassell, Gary J., Silani, Vincenzo, Drory, Vivian E., Brown, Robert H., Landers, John E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3575525/
https://www.ncbi.nlm.nih.gov/pubmed/22801503
http://dx.doi.org/10.1038/nature11280
Descripción
Sumario:Amyotrophic lateral sclerosis (ALS) is a late-onset neurodegenerative disorder resulting from motor neuron death. Approximately 10% of cases are familial (FALS), typically with a dominant inheritance mode. Despite numerous advances in recent years(1-9), nearly 50% of FALS cases have unknown genetic etiology. Here we show that mutations within the profilin 1 (PFN1) gene can cause FALS. PFN1 is critical for monomeric (G)-actin conversion to filamentous (F)-actin. Exome sequencing of two large ALS families revealed different mutations within the PFN1 gene. Additional sequence analysis identified 4 mutations in 7 out of 274 FALS cases. Cells expressing PFN1 mutants contain ubiquitinated, insoluble aggregates that in many cases contain the ALS-associated protein TDP-43. PFN1 mutants also display decreased bound actin levels and can inhibit axon outgrowth. Furthermore, primary motor neurons expressing mutant PFN1 display smaller growth cones with a reduced F-/G-actin ratio. These observations further document that cytoskeletal pathway alterations contribute to ALS pathogenesis.