This disclosure provides single-stranded and multi-stranded nucleic acid compounds having one or more double-stranded regions that regulate the function or expression of nucleic acid molecules expressed in a cell or a cell regulatory system dependent upon a nucleic acid. The disclosure provides a range of nucleic acid compounds having one or more conformationally restricted nucleomonomers (CRN). Certain nucleic acid compounds may have one or more conformationally restricted nucleomonomers and one or more hydroxymethyl substituted nucleomonomers (UNA). The nucleic acid compounds are useful in various therapeutic modalities.
