2-p21.1, a large gene that encodes
dystrophin, a muscle protein
. Deletions in specific areas of the gene are associated with cognitive impairment
, verbal memory
, auditory comprehension, increased risk of ADHD
& Autistic Spectrum Disorder. Each son of a carrier mom has a 50% chance of having DMD. Carrier girls can have muscle weakness
, including heart
. See mda.org & a geneticist.