Enables actin filament binding activity. Acts upstream of or within microvillus assembly. Located in several cellular components, including basal plasma membrane; brush border; and lateral plasma membrane. Is expressed in several structures, including inner ear and intestine. Human ortholog(s) of this gene implicated in autosomal dominant nonsyndromic deafness 48 and sensorineural hearing loss. Orthologous to human MYO1A (myosin IA). [provided by Alliance of Genome Resources, Apr 2022]