Huntingtin antisense RNA 1 (head to head) (HTT-AS1)

Huntington antisense RNA 1 (head to head), abbreviated as HTT-AS1, is a long non-coding RNA transcribed from the region opposite the huntingtin gene (HTT) locus. It functions as a natural antisense transcript, acting primarily to regulate the expression of the HTT gene at the transcriptional and post-transcriptional levels[1][2]. Like other antisense RNAs, HTT-AS1 operates through mechanisms such as hybridizing with HTT mRNA to block its translation, recruiting nucleases for targeted degradation, and modulating chromatin structure and transcription factor access[1][2]. Therapeutically, HTT-AS1—and antisense mechanisms targeting HTT transcripts—form the basis of gene-silencing approaches in Huntington's disease, aiming to reduce mutant huntingtin protein production and prevent neuronal degeneration[4]. Safety concerns for therapeutics targeting HTT-AS1 include off-target effects, interference with normal HTT function, and immune reactions to oligonucleotide drugs, emphasizing the need for precision medicine approaches[4]. If additional gene-specific information about the exact sequence, expression profile, or unique disease mechanisms of HTT-AS1 in Huntington's disease becomes available, it could further refine its use as a biomarker or therapeutic target. Current consensus is that antisense regulation at the HTT locus is a valid target for gene silencing strategies in neurodegeneration[4].

Other names

HTT antisense RNAHTT-ASHTTASHTT-AS1HTT antisense RNA (head to head)HTT antisense RNA 1 (head to head)HTT antisense RNA 1 (non-protein coding)

RNA hybridization: HTT-AS binds to complementary HTT mRNA, blocking translation; Promotion of RNA degradation: triggers RNase H-mediated cleavage or nonsense-mediated decay if targeted by ASOs; Modulation of chromatin or transcriptional machinery