He has duchenne muscular dystrophy which is ultimately a fatal disease.

他患有杜氏肌营养不良症，这最终是一种致命的疾病。

Within that group, dystrophinopathies are the most common, which includes Duchenne muscular dystrophy, or DMD, and Becker muscular dystrophy, both of which result from mutations in the dystrophin gene.

这些功能紊乱中，营养不良疾病是最常见的，包括Duchenne型肌营养不良（DMD）和Becker型肌营养不良（BMD）；这二者都是由抗肌萎缩蛋白基因突变导致的。

On the other hand, mutations that allow for a misshapen protein to form, like missense mutations, lead to Becker muscular dystrophy which is basically a milder form of Duchenne muscular dystrophy that presents later on, usually between age 10 to 20.

另一方面，突变（如错义突变）会导致畸形蛋白形成，引发BMD，病情比DMD较轻，发病年龄较晚，一般在10到20岁。