delta helicase, ATP-dependent helicase RENT1, regulator of nonsense transcripts 1, smg-2, UPF1 regulator of nonsense transcripts homolog, up-frameshift suppressor 1 homolog, yeast Upf1p homolog, UTF, up-frameshift mutation 1 homolog, nonsense mRNA reducing factor 1, smg-2 homolog, nonsense mediated mRNA decay factor, HUPF1, pNORF1, NORF1, RENT1