The invention relates to an artificial nucleic acid molecule comprising at least one open reading frame and at least one 3′-untranslated region element (3′-UTR element) comprising a nucleic acid sequence which is derived from the 3′-UTR of a FIG4 gene or from a variant of the 3′-UTR of a FIG4 gene. The invention further relates to the use of such an artificial nucleic acid molecule in gene therapy and/or genetic vaccination. Furthermore, the invention relates to the use of a 3′-UTR element comprising a nucleic acid sequence which is derived from the 3′-UTR of a FIG4 gene or from a variant of the 3′-UTR of a FIG4 gene for the stabilization and/or prolongation of protein expression from a nucleic acid sequence comprising such 3′-UTR element.
