Provided herein are RNAi molecules including a first strand containing a guide sequence and a second strand comprising a non-guide sequence where the non-guide sequence contains a bulge opposite the seed region of the guide sequences; e.g., opposite the cleavage sequence. In some aspects, the invention provides RNAi for treating Huntington’s disease. Further provided herein are expression cassettes, vectors (e.g., rAAV, recombinant adenoviral, recombinant lentiviral, and recombinant HSV vectors), cells, viral particles, and pharmaceutical compositions containing the RNAi. Yet further provided herein are methods and kits related to the use of the RNAi, for example, to treat Huntington’s disease.本案提供RNAi分子,其包括含有指導序列的第一鏈和包含非指導序列的第二鏈,其中所述非指導序列含有所述指導序列的種子區對側,例如切割序列對側的凸出。在一些方面,本發明提供用於治療亨廷頓病的RNAi。本申請進一步提供含有所述RNAi的表現盒、載體(例如,rAAV、重組腺病毒載體、重組慢病毒載體和重組HSV載體)、細胞、病毒顆粒和藥物組合物。本案又進一步提供關於使用所述RNAi,例如於治療亨廷頓病的方法和套組。