Mutations in the profilin 1 gene cause familial amyotrophic lateral sclerosis
Interdisciplinary Graduate Program
Department of Neurology; Department of Biochemistry and Molecular Pharmacology
Genetics | Genomics | Molecular Biology | Molecular Genetics | Nervous System Diseases | Neurology | Neuroscience and Neurobiology
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, nearly 50% of FALS cases have unknown genetic aetiology. Here we show that mutations within the profilin 1 (PFN1) gene can cause FALS. PFN1 is crucial for the conversion of monomeric (G)-actin to filamentous (F)-actin. Exome sequencing of two large ALS families showed different mutations within the PFN1 gene. Further 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.
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Citation: Nature. 2012 Aug 23;488(7412):499-503. doi: 10.1038/nature11280. Link to article on publisher's site
Wu, Chi-Hong; Keagle, Pamela J.; Sapp, Peter; Piotrowska, Katarzyna; Lowe, Patrick; McKenna-Yasek, Diane; Baron, Desiree; Kost, Jason E.; Gonzalez-Perez, Paloma; Fox, Andrew D.; Adams, Jenni; Leclerc, Ashley Lyn; Moore, Melissa J.; Zitzewitz, Jill A.; Xu, Zuoshang; Bosco, Daryl; Brown, Robert H. Jr.; and Landers, John E., "Mutations in the profilin 1 gene cause familial amyotrophic lateral sclerosis" (2012). GSBS Student Publications. 1992.