May be involved in transcriptional regulation (By similarity). Down-regulates MYOD1 expression and may up-regulate MYF5 expression. May regulate microRNA (miRNA) transcription, up-regulating the expression of some myogenic miRNAs, including MIR1-1, MIR133A2, MIR133B and MIR206. Impairs the differentiation of myoblasts and may be involved in muscle regeneration. May interact with MYF5; regulates MYF5 expression. Expressed in muscles, as well as in primary myoblasts and myotubes (at protein level). Up-regulated during myoblasts differentiation (at protein level). Up-regulated in myoblasts of facioscapulohumeral muscular dystrophy (FSHD) patients (at protein level).