On which chromosome is the genetic disorder myofibrillar myopathy?

80% not identified: Here is a good link to get more information about this condition. http://www.ncbi.nlm.nih.gov/books/nbk1499/ they have identified a number of genes that contribute to that condition. If the gene causing mutation has been established then genetic counseling may help with prenatal testing. We have established some of the genes involved but only 20% of cases have a genetic basis identified.