The present disclosure provides meroduplex ribonucleic acid molecules (mdRNA) capable of decreasing or silencing WNT1, WNT2, or WNT3A gene expression. An mdRNA of this disclosure comprises at least three strands that combine to form at least two non-overlapping double-stranded regions separated by a nick or gap wherein one strand is complementary to a WNT1, WNT2, or WNT3A mRNA. In addition, the meroduplex may have at least one uridine is a 5-methyluridine, a nucleoside is a locked nucleic acid, or optionally other modifications, and any combination thereof. Also provided are methods of decreasing expression of a WNT1, WNT2, or WNT3A gene in a cell or in a subject to treat a WNT1, WNT2, or WNT3A-related disease.
