MYH14 and dilated cardiomyopathy: Moreover, previous studies that characterized mutations that cause myosin storage myopathies (L1793P, R1485W, E1886K and H190L) and mutations in the same residue that either causes MPD-1 (R1500P) or dilated cardiomyopathy (R1500W) did not alter the secondary structure of LMM [14], [27].