TY - JOUR A1 - Nogales-Gadea, Gisela AU - Rubio, Juan Carlos AU - Fernández-Cadenas, Israel AU - García-Consuegra, Inés AU - Lucía Mulas, Alejandro AU - Cabello Sánchez, Ana Belén AU - García-Arumi, Elena AU - Arenas, Joaquín AU - Andreu, Antoni L. AU - Martín, Miguel Ángel T1 - Expression of the muscle glycogen phosphorylase gene in patients with McArdle disease: the role of nonsense-mediated mRNA decay Y1 - 2008 SN - 10981004 UR - http://hdl.handle.net/11268/895 AB - Nearly 35% of all mutations identified in the muscle glycogen phosphorylase gene (PYGM) in patients with McArdle disease result in premature termination codons (PTCs), particularly the p.R50X mutation. The latter accounts for more than 50% of the mutated alleles in most Caucasian patient populations. Mutations resulting in PTC could trigger the degradation of mRNA through a mechanism known as nonsense mediated decay (NMD). To investigate if NMD affects the levels of transcripts containing PYGM mutations, 28 Spanish patients with McArdle disease, harboring 17 different mutations with PTCs in 77% of their alleles, were studied. Transcripts levels of PYGM were measured and sequenced. We assessed that 92% of patients showed NMD. The most frequent mutation (p.R50X) elicited decay in all the genotypes tested. Other PTC producing mutations resulting in NMD were: p.L5VfsX22, p.Q73HfsX7, p.E125X, p.N134KfsX161, p.W388SfsX34, p.R491AfsX7, and p.D534VfsX5. Located in the last exon, the mutation p.E797VfsX19 was not affected by NMD. Missense mutations did not appear to be affected by NMD. In the cDNA sequences they appeared as homozygous, despite being heterozygous in the genomic DNA sequences. Exceptions to the rules governing NMD were found in the mutations p.A704 V and p.K754NfsX49. KW - Codon, Nonsense/*Genetics KW - Glycogen Phosphorylase, Muscle Form/*Genetics KW - Glycogen Storage Disease Type V/*Enzymology KW - Glycogen Storage Disease Type V/*Genetics KW - Rna Stability/*Genetics KW - Dna Mutational Analysis KW - Electrophoresis, Agar Gel KW - Gene Expression Profiling KW - Humans KW - Mutation/Genetics KW - Transcription, Genetic KW - Genética humana LA - eng ER -