Key result
DMD gene screening identifies 13 novel variants supporting a clinical continuum between Duchenne and Becker.
Why the study?
Determining the course of disease from genetic analysis alone in X-linked dystrophinopathies remains challenging, necessitating combined clinical, histological, and molecular genetic data for better understanding.
Observational (n=403)
No
The study expands the genetic landscape of dystrophinopathies by identifying 13 novel DMD variants and highlights the value of combining clinical, histological, and molecular data to understand the disease continuum.
May refine dystrophinopathy diagnostics; extends variant spectrum but leaves clinical impact hypothesis-generating.
Background/Objectives: X-linked dystrophinopathies are a group of neuromuscular diseases caused by pathogenic variants in the DMD gene (MIM *300377). Duchenne muscular dystrophy (DMD; MIM #310200) is the most common inherited muscular dystrophy. Methods: We screened datasets of 403 male, genetically confirmed X-linked dystrophinopathy patients and identified 13 pathogenic variants of the DMD gene that have not been described in the literature thus far. For all patients we provide additional data on the clinical course, genotype–phenotype correlations as well as histological datasets of nine patients. In two cases, we used RNA-Seq analyses, showing that this method can be particularly helpful in cases of deep intrinsic variants. Results: We were able to show, that a combination of the different datasets is helpful to counsel families and provides a better understanding of the underlying pathophysiology. Conclusions: Overall, we elaborated upon the persistent challenge of determining the course of disease from genetic analysis alone, rather supporting the concept of a clinical continuum of dystrophinopathies with our combined clinical, histological and molecular genetic findings.
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Neuhoff et al. (2024) conducted an observational in X-linked dystrophinopathies (Duchenne and Becker muscular dystrophy) (n=403). Novel DMD gene variants was evaluated. Screening of 403 male patients with X-linked dystrophinopathies identified 13 novel pathogenic variants in the DMD gene, supporting a clinical continuum between Duchenne and Becker muscular dystrophy rather than a restrictive division.