Transcriptome alterations in myotonic dystrophy skeletal muscle and heart

Area of Science:

• Genomics
• Molecular Biology
• Genetic Diseases

Background:

• Myotonic dystrophy (DM) is a multi-systemic genetic disorder caused by expanded microsatellite repeats.
• DM exhibits significant clinical variability, partly due to muscleblind-like protein sequestration by repeat-containing RNAs.
• Other cellular pathways are perturbed in DM, contributing to symptom severity variations.

Purpose of the Study:

• To investigate transcriptome changes in skeletal and heart muscle of DM patients to understand disease variability.
• To identify tissue-specific RNA processing alterations and gene expression patterns correlated with muscle strength.
• To create a publicly accessible web resource for DM transcriptome data.

Main Methods:

• Generated 120 RNASeq transcriptomes from healthy and DM1 muscle biopsies/autopsies, plus limited DM2 and Duchenne muscular dystrophy samples.
• Analyzed splicing patterns and gene expression profiles.
• Developed a web resource (http://DMseq.org) for data browsing and analysis.

Main Results:

• Identified tissue-specific changes in RNA processing and gene expression in DM.
• Uncovered transcriptome alterations that strongly correlate with muscle strength.
• Provided raw and processed transcriptome data through the DMseq.org web resource.

Conclusions:

• Transcriptome analysis reveals key molecular differences contributing to myotonic dystrophy variability.
• The identified changes in RNA processing and gene expression offer insights into disease mechanisms.
• The DMseq.org resource facilitates further research into myotonic dystrophy and related genetic muscle disorders.