MYH3 and childhood apraxia of speech: Variations in many muscular genes have been involved in the pathogenesis of DAs, including myosin Heavy Chain 3 (MYH3, MIM ∗160720), troponin I Type 1 (TNNI1, MIM ∗191042), troponin I Type 2 (TNNI2, MIM ∗191043), and fast skeletal muscle TNNT (TNNT3, MIM ∗600692) [2, 4–9].