Enables mRNA 3'-UTR binding activity. Involved in mRNA destabilization and posttranscriptional gene silencing. Acts upstream of or within positive regulation of gene expression. Predicted to be located in cytoplasmic stress granule; nucleoplasm; and perinucleolar compartment. Predicted to be part of ribonucleoprotein complex. Predicted to be active in cytoplasm and nucleus. Orthologous to human CELF1 (CUGBP Elav-like family member 1). [provided by Alliance of Genome Resources, Apr 2022]