Involved in directing the movement of organelles along actin filaments. Phosphorylated by ALPK1. Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family. Represents an unconventional myosin. This protein should not be confused with the conventional myosin-1 (MYH1). MYO1A mutations have been reported to cause autosomal dominant non-syndromic hearing loss DFNA48 (PubMed:12736868). It was later shown that MYO1A is not associated with DFNA48 (PubMed:24616153).