Myotonic dystrophy is an autosomal dominant genetic disorder that can be broken down into: type 1, which is caused by the expansion of more than 50 CTG trinucleotide repeats in the DMPK gene, has a congenital and an adult form and is more severe; and type 2, which is caused by the expansion of more than 75 CCTG tetranucleotide repeats in the CNBP gene, is adult-onset and milder. To learn more, watch our video: http://osms.it/myoto8c5a5 #FOAMed #learnmedicine #Osmosis #boardreview #medicine #path