Approximately two-thirds of Duchenne muscular dystrophy (DMD) patients show intragenic deletions ranging from one to several exons of the DMD gene and leading to a premature stop codon. Other deletions that maintain the translational reading frame of the gene result in the milder Becker muscular dystrophy (BMD) form of the disease. Thus the opportunity to transform a DMD phenotype into a BMD phenotype appeared as a new treatment strategy with the development of antisense oligonucleotides technology, which is able to induce an exon skipping at the pre-mRNA level in order to restore an open reading frame. Because the DMD gene contains 79 exons, thousands of potential transcripts could be produced by exon skipping and should be investigated. The conventional approach considers skipping of a single exon. Here we report the comparison of single- and multiple-exon skipping strategies based on bioinformatic analysis. By using the Universal Mutation Database (UMD)-DMD, we predict that an optimal multiexon skipping leading to the del45-55 artificial dystrophin (c.6439_8217del) could transform the DMD phenotype into the asymptomatic or mild BMD phenotype. This multiple-exon skipping could theoretically rescue up to 63% of DMD patients with a deletion, while the optimal monoskipping of exon 51 would rescue only 16% of patients.
espanolEl entrenamiento de sprint repetidos parece ser una estrategia eficiente para el desarrollo simultaneo de diferentes componentes de la condicion fisica en deportes intermitentes. El objetivo del presente estudio fue analizar los efectos de suplementar el entrenamiento habitual, mediante un entrenamiento basado en sprint repetidos, sobre la capacidad de repetir sprints (RSA), el tiempo de reaccion en situacion de fatiga y la capacidad de salto. Para ello veintisiete jovenes futbolistas (edad 17.7 ± 0.7 anos) fueron divididos en dos grupos y asignados a un grupo de entrenamiento (GER, n = 14) y a un grupo control (GC, n = 13). Ambos grupos realizaron cuatro semanas de identico entrenamiento, para posteriormente realizar cuatro semanas de la intervencion especifica GER (entrenamiento habitual mas 3 sesiones semanales realizando 2 series de 8 repeticiones sobre 10-30 metros a la maxima intensidad) y continuar con el entrenamiento habitual GC durante las 4 ultimas semanas de la temporada. No se mostraron efectos significativos en la mejora del tiempo medio (TE = -0.17; Posible Trivial) y el decrecimiento (TE = -0.11; poco claro) del test RSA, ni en la diferencia entre el tiempo de reaccion del sprint 1 y 8 de un test RSA antes y despues de la intervencion (TE = 0.27; poco claro) mediante sprint repetidos. La suplementacion del entrenamiento mediante sprint repetidos al final del macrociclo competitivo no mostro efectos significativos en la mejora del RSA ni en el tiempo de reaccion en jovenes futbolistas. English Repeated sprint training appears to be an efficient strategy for the simultaneous development of different fitness components in intermittent sport. The aim of this study was to analyze the effects of implement training with repeated sprint training on repeated sprint ability (RSA), reaction time in fatigue condition and jump height. Twenty-seven young soccer players (age 17.7 ± 0.7 years) were assigned to intervention group (GER, n = 14) and control group (GC, n = 13). Both groups perform over four weeks the identical training program with the objective that the previous training did not condition the results and later, GER implement the habitual training with specific intervention (habitual training plus 3 weekly sessions, 2 sets of 8 repetitions on 10-30 meters at maximum intensity) and GC continue with habitual training over the last four weeks of the competitive period. Repeated sprint training not shown significant improvement in mean time (TE = -0.17, Possible Trivial) and decrement (TE = -0.11, unclear) obtained in an RSA test, nor in the difference between the reaction time of sprint 1 and 8 of an RSA test before and after the intervention (TE = 0.27; Clear). The implementation of the habitual training by RST at the end of the competitive season has not shown significant positive effects in the RSA nor in the reaction time in young players.
Duchenne muscular dystrophy (DMD) is associated with mutations in the dystrophin gene that disrupt the open reading frame whereas the milder Becker's form is associated with mutations which leave an in-frame mRNA transcript that can be translated into a protein that includes the N- and C- terminal functional domains. It has been shown that by excluding specific exons at, or adjacent to, frame-shifting mutations, open reading frame can be restored to an out-of-frame mRNA, leading to the production of a partially functional Becker-like dystrophin protein. Such targeted exclusion can be achieved by administration of oligonucleotides that are complementary to sequences that are crucial to normal splicing of the exon into the transcript. This principle has been validated in mouse and canine models of DMD with a number of variants of oligonucleotide analogue chemistries and by transduction with adeno-associated virus (AAV)-small nuclear RNA (snRNA) reagents encoding the antisense sequence. Two different oligonucleotide agents are now being investigated in human trials for splicing out of exon 51 with some early indications of success at the biochemical level.
New, simpler and cheaper tools are necessary to properly control fermentation processes at the industrial level. In this paper, a simple method to calculate a major parameter, ethanol concentration, at any time in the fermentation medium by measuring only the temperature evolution, has been developed and successfully applied to industrial cider fermentation.