Extensive genetics of ALS: A population-based study in Italy

Adriano Chio, Andrea Calvo, Letizia Mazzini, Roberto Cantello, Gabriele Mora, Cristina Moglia, Lucia Corrado, Sandra D'Alfonso, Elisa Majounie, Alan Renton, Fabrizio Pisano, Irene Ossola, Maura Brunetti, Bryan J. Traynor, Gabriella Restagno

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To assess the frequency and clinical characteristics of patients with mutations of major amyotrophic lateral sclerosis (ALS) genes in a prospectively ascertained, population-based epidemiologic series of cases. Methods: Thestudy population includes allALScases diagnosed in Piemonte, Italy, from January2007to June 2011. Mutations of SOD1, TARDBP, ANG, FUS, OPTN, andC9ORF72have been assessed. Results: Out of the 475 patients included in the study, 51 (10.7%) carried a mutation of an ALS-related gene (C9ORF72, 32; SOD1, 10; TARDBP, 7; FUS, 1; OPTN, 1; ANG, none). A positive family history for ALS or frontotemporal dementia (FTD) was found in 46 (9.7%) patients. Thirty-one (67.4%) of the 46 familial cases and 20 (4.7%) of the 429 sporadic cases had a genetic mutation. According to logistic regression modeling, besides a positive family history for ALS or FTD, the chance to carry a genetic mutation was related to the presence of comorbid FTD (odds ratio 3.5; p = 0.001), and age at onset ≤54 years (odds ratio 1.79; p = 0.012). Conclusions: We have found that ̃11% of patients with ALS carry a genetic mutation, with C9ORF72 being the commonest genetic alteration. Comorbid FTD or a young age at onset are strong indicators of a possible genetic origin of the disease.

Original languageEnglish
Pages (from-to)1983-1989
Number of pages7
JournalNeurology
Volume79
Issue number19
DOIs
Publication statusPublished - Nov 6 2012

ASJC Scopus subject areas

  • Clinical Neurology
  • Arts and Humanities (miscellaneous)

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