Total RNA-seq as a Tool to Study DMD Splicing and Transcriptional Dynamics

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Duchenne muscular dystrophy (DMD) research relies on understanding dystrophin gene mRNA.
• Early methods like cDNA sequencing and RT-PCR identified mutation types and transcription times.

Purpose of the Study:

• To outline a cost-effective RNA sequencing (RNA-seq) protocol for analyzing muscle biopsy total RNA from DMD/BMD patients.
• To focus on resolving pseudoexon and intronic mutations within the dystrophin gene locus.

Main Methods:

• Utilized RNA sequencing (RNA-seq) with ribosomal RNA (rRNA) depletion.
• Examined total RNA from muscle biopsies of patients with DMD/BMD.
• Focused on analyzing exon and intron mRNA levels.

Main Results:

• The RNA-seq approach provides sufficient coverage for robust evaluation of DMD mRNA levels.
• This method effectively identifies pseudoexon and intronic mutations.
• Achieved comparable read depths for both exon and intron regions.

Conclusions:

• RNA sequencing offers a powerful and cost-effective strategy for comprehensive DMD mutation analysis.
• This protocol enhances the study of mRNA transcription and splicing in DMD/BMD.
• The method facilitates the detection of complex intronic mutations impacting dystrophin expression.