Influence of Dystrophin Isoform Deficiency on Motor Development in Duchenne Muscular Dystrophy
Mary Chesshyre, Deborah Ridout, Georgia Stimpson, Laurent Servais, Giovanni Baranello, Adndn Manzur, UK NorthStar Clinical Network, Francesco Muntoni. Influence of Dystrophin Isoform Deficiency on Motor Development in Duchenne Muscular Dystrophy. Annals of Clinical and Translational Neurology. 2025
Lay Summary
Duchenne muscular dystrophy (DMD) is a serious condition that affects the muscles, including those used for movement and walking. It is caused by changes in a gene called DMD, which normally helps produce a protein called dystrophin. There are different forms (called “isoforms”) of this protein, and some are important not just in muscles, but also in the brain. In particular there are 3 different types of isoforms which are affected in different ways depending of where in the DMD gene the misspelling that caused Duchenne muscular dystrophy is located.
This study looked at over 300 young boys with DMD, aged 3 to 6 years, to see how the lack of different dystrophin isoforms in the brain affects their ability to perform movement tasks, such as standing up, walking, or climbing. The boys were divided into three groups based on how many dystrophin isoforms were missing and various standards assessment to measure muscle function in clinic were studied.
The findings suggest that missing brain-related forms of dystrophin can make it harder for young boys with DMD to develop and perform motor skills and that this difficulty is more significant depending on how many isoforms produced in the brain are affected by the underlying genetic misspelling in the DMD gene. This highlights the important role that dystrophin plays not just in muscles, but also in brain development and movement control.
