Baylor College of Medicine Apr 3 2026 Myotonic dystrophy type 1 (DM1) is the most common cause of adult-onset muscular dystrophy, a genetic disorder that leads to muscle weakness and wasting, but also affects the brain, the gastrointestinal tract and the heart. In a study published in the Journal of Clinical Investigation Insight, researchers at Baylor College of Medicine focused on the effects of DM1 in the heart. Their findings help answer questions about why the disease worsens over time and