DMD and Duchenne muscular dystrophy: To address whether the low read depth at exon 1 in P7 was due to the capture or sequencing process, we analyzed the median depth of exon 1 of the DMD gene in the 100 control specimens, and no deletion was detected, suggesting that proband (P7) contains a deletion of exon 1 of the DMD gene that may be associated with DMD disease.