Multifunctional RNA-binding protein involved in the regulation of pre-mRNA splicing, mRNA stability and mRNA translation important for cell fate decision and differentiation. Plays a major role in pre-mRNA alternative splicing regulation. Mediates preferentially muscle-specific exon inclusion in numerous mRNAs important for striated cardiac and skeletal muscle cell differentiation. Binds to intronic splicing enhancer (ISE) composed of stretches of GU-rich motifs localized in flanking intron of exon that will be included by alternative splicing. Involved in embryonic stem cell (ESC) transition to cardiac cell differentiation by promoting pre-mRNA alternative splicing events of several pluripotency and/or differentiation genes. Plays a role in the regulation of mRNA stability and mRNA translation to which it is bound. Involved in myogenic differentiation by regulating MYOG levels. Binds to a huge amount of mRNAs (By similarity). Involved in embryonic heart development and myogenic differentiation of somitic muscle progenitors (PubMed:25217815). Expressed in differentiated myotomal muscle progenitors in embryos at 3 days of development (at protein level). Expressed in somites in embryos at 3 and 3.5 days of development. Expressed in the mesodermal core of the first and second branchial arches at 3 days of development. Expressed in forelimbs and hindlimbs at 3.5 days of development. Expressed in non-muscle territories including lens and otic vesicle at 3 days of development. The RRM domain is necessary for mRNA stability and mRNA translation regulation.