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From INSERM U619 (P.C., P.V., C.A., S.V., C.R.A.), Tours; Université François-Rabelais, Tours; ALS Center (P.C., B.d.T.), Department of Neurology, CHRU, Tours; ALS Center (W.C.), Hôpital Gui de Chauliac, CHU de Montpellier; and Centre d’Investigation Clinique (J.M.H., B.G.), INSERM 202, CHRU, Tours, France.
* To whom correspondence should be addressed. E-mail: corcia{at}med.univ-tours.fr.
Abstract-- Background: SMN1 gene deletions cause spinal muscular atrophy, and SMN2 gene deletions have been associated with sporadic lower motor neuron diseases. Objectives: To study the frequency of abnormal SMN1 gene copy numbers and to determine whether SMN2 gene modulates the risk of amyotrophic lateral sclerosis (ALS) or the duration of evolution. Method: The authors studied SMN1 and SMN2 genes in 600 patients with sporadic ALS and 621 controls using a quantitative PCR method. Results: The authors found an association of ALS with an abnormal copy number (one or three copies) of SMN1 gene (p < 0.0001) with an OR of 2.8 (1.8 to 4.4, 95% CI). There was no association with SMN2 copy numbers and no effect of SMN2 copies on the duration of evolution in ALS independently of SMN1 copy number. Conclusion: Abnormal SMN1 gene copy numbers are a genetic risk factor in sporadic amyotrophic lateral sclerosis. There was no modulator effect of the SMN2 gene.
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