Enables single-stranded RNA binding activity. Predicted to be involved in nervous system development and regulation of alternative mRNA splicing, via spliceosome. Predicted to be located in cytoplasm and nucleus. Expressed in body wall musculature; intestine; nervous system; and vulval muscle. Human ortholog(s) of this gene implicated in dilated cardiomyopathy; hypoplastic left heart syndrome; myotonic dystrophy type 1; and type 2 diabetes mellitus. Is an ortholog of human RBFOX1 (RNA binding
fox-1 homolog 1); RBFOX2 (RNA binding
fox-1 homolog 2); and RBFOX3 (RNA binding
fox-1 homolog 3).