Provided herein are compositions and methods of treating muscular dystrophy (MD), such as administering an effective amount of a composition that increases the expression of JAG1, a composition comprising a JAG1 agonist, or a composition that promotes JAG1 signaling. Also provided are methods of prognosing MD or evaluating responsiveness to treatment for MD, e.g., by measuring an expression level of JAG1, and methods of identifying a compound for the treatment of MD.

The present invention features modified human transcription factors capable of increasing utrophin expression, recombinant adeno-associated vectors for delivery of the modified human transcription factors, and methods of treating muscle diseases, including Duchenne's muscular dystrophy.

In certain aspects, the present invention provides compositions and methods for inducing utrophin expression in muscle with an ActRIIB protein as therapy for muscular dystrophy. The present invention also provides methods of screening compounds that modulate activity of an ActRIIB protein and/or an ActRIIB ligand.

The present invention provides a delivery technique for delivering a gene modification tool capable of providing a high gene modification efficiency in cells. The composition according to the present invention is a composition for inducing gene modification at a target gene locus in a cell, the composition containing 1) a compound represented by formula (I) or a salt thereof; 2) a structural lipid; and 3) a guide RNA or a DNA including a sequence encoding the guide RNA, and/or an RNA-guided nuclease or a nucleic acid including a sequence encoding the RNA-guided nuclease. In formula (I), n represents an integer of 2 to 5, R represents a linear C.sub.1-5 alkyl group, a linear C.sub.7-11 alkenyl group, or a linear C.sub.11 alkadienyl group, and wavy lines each independently represent a cis-type bond or a trans-type bond.

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The present invention concerns a quasidystrophin (QD) having the structure CH1CH2H1R1R2R3H2R8R9 in its N-terminal part and advantageously further comprising the R16 and R17 rod domains, as well as the dual AAV vector system which allows producing it.

The present application provides materials and methods for treating a patient with Duchenne Muscular Dystrophy (DMD) both ex vivo and in vivo. In addition, the present application provides materials and methods for editing a dystrophin gene in a cell by genome editing.

Disclosed herein are CRISPR/Cas-based genome editing compositions and methods for treating Duchenne Muscular Dystrophy by restoring dystrophin function.

Disclosed herein are therapeutic targets for the correction of the human dystrophin gene by gene editing and methods of use.

Disclosed herein are CRISPR/Cas-based base editing compositions and methods for treating Duchenne Muscular Dystrophy by restoring dystrophin function. In an aspect, the disclosure relates to a CRISPR/Cas-based base editing system for altering a RNA splice site encoded in the genomic DMA of a subject. In some embodiments, altering the RNA splice site encoded in the genomic DNA results in exclusion or inclusion of at least one exon sequence in an RNA transcript.

Disclosed herein are guide sequences for modifying a dystrophin gene using CRISPR technology. Specifically, the disclosure provides a method of modifying a dystrophin gene in a cell or a subject, which comprises introducing into the cell or subject (a) a Cas protein or a nucleotide sequence encoding the Cas protein; and a single guide RNA (gRNA), or a first gRNA and a second gRNA, wherein the Cas protein is a type II CRISPR/Cas endonuclease. Further disclosed are gRNA nucleic acid sequences.