Qualitative or Quantitative Defects of Beta-Myosin Heavy Chain is related to familial isolated arrhythmogenic right ventricular dysplasia and cardiomyopathy, dilated, 1b. An important gene associated with Qualitative or Quantitative Defects of Beta-Myosin Heavy Chain is LOC126861897 (BRD4-Independent Group 4 Enhancer GRCh37_chr14:23884455-23885654).