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Authors: Medrano, Sofía; Monges, Soledad; Gravina, Luis Pablo; Alías, Laura; Mozzoni, Julieta; Aráoz, Hilda Verónica; Bernal, Sara; Moresco, Angélica; Chertkoff, Lilien Patricia; Tizzano, Eduardo
Publication Date: 2016.
Language: English.
Abstract:
Background/Purpose: Spinal muscular atrophy (SMA) is an autosomal recessive neuromuscular disorder, considered one of the leading causes of infant mortality. It is caused by mutations in the SMN1 gene. A highly homologous copy of this gene named SMN2 and other neighbouring genes, SERF1A and NAIP, are considered phenotypic modifiers of the disease. In recent years, notable advances have been made in SMA research regarding evaluation, prognosis, and therapeutic options. Thus, genotype-phenotype studies in SMA are important to stratify patients for motor function tests and for envisaged clinical trials. The aim of this study was to provide clinical and molecular data of a series of Argentinean children with SMA to establish a comprehensive genotype-phenotype correlation. Methods: 144 Argentinean children with SMA (56 children with type I, 58 with type II, and 30 with type III) were evaluated. The copy number of SMN2, SERF1A, and NAIP genes was established using MLPA (Multiplex Ligation-dependent Probe Amplification) and then correlated with the patients clinical subtypes. To improve clinical characterization we considered the initial symptoms that prompted the consultation, age of acquisition of motor abilities to independent walking and age at loss of gait. We also evaluated clinical and molecular features of sibling pairs in seven families. Results: A strong correlation was observed between the SMN2 copy number and SMA phenotype while SERF1A and NAIP copy number showed a moderate correlation. We observed intra- and inter-family differences among the SMA types. Conclusion: This first genotype-phenotype correlation study in Argentinean SMA children provides data to improve patient stratification and define more adequate follow-up parameters.
Author affiliation: Medrano, Sofía. Gobierno de la Ciudad de Buenos Aires. Hospital de Pediatría "Juan P. Garrahan"; Argentina
Author affiliation: Monges, Soledad. Gobierno de la Ciudad de Buenos Aires. Hospital de Pediatría "Juan P. Garrahan"; Argentina
Author affiliation: Gravina, Luis Pablo. Gobierno de la Ciudad de Buenos Aires. Hospital de Pediatría "Juan P. Garrahan"; Argentina
Author affiliation: Alías, Laura. Hospital de la Santa Creu i Sant Pau; España. CIBERER; España
Author affiliation: Mozzoni, Julieta. Hospital de la Santa Creu i Sant Pau; España
Author affiliation: Aráoz, Hilda Verónica. Gobierno de la Ciudad de Buenos Aires. Hospital de Pediatría "Juan P. Garrahan"; Argentina
Author affiliation: Bernal, Sara. Hospital de la Santa Creu i Sant Pau; España. CIBERER; España
Author affiliation: Moresco, Angélica. Gobierno de la Ciudad de Buenos Aires. Hospital de Pediatría "Juan P. Garrahan"; Argentina
Author affiliation: Chertkoff, Lilien Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Gobierno de la Ciudad de Buenos Aires. Hospital de Pediatría "Juan P. Garrahan"; Argentina
Author affiliation: Tizzano, Eduardo. Hospital Valle Hebron; España. CIBERER; España
Keywords: Spinal muscular atrophy (SMA); Survival motor neuron 1 gene (SMN1); Survival motor neuron 2 gene (SMN2); Neuronal apoptosis inhibitory protein gene (NAIP); Small EDRK-rich factor 1A (SERF1A); Multiplex Ligation-dependent Probe Amplification (MLPA); Inmunología; Medicina Básica; CIENCIAS MÉDICAS Y DE LA SALUD.
Repository: CONICET Digital (CONICET). Consejo Nacional de Investigaciones Científicas y Técnicas