Mutation-agnostic RNA interference with engineered replacement rescues Tmc1-related hearing loss

Yoichiro Iwasa, Miles J. Klimara, Hidekane Yoshimura, William D. Walls, Ryotaro Omichi, Cody A. West, Seiji B. Shibata, Paul T. Ranum, Richard Jh Smith

研究成果査読

5 被引用数 (Scopus)

抄録

Hearing loss is the most common sensory deficit, of which genetic etiologies are a frequent cause. Dominant and recessive mutations in TMC1, a gene encoding the pore-forming subunit of the hair cell mechanotransduction channel, cause DFNA36 and DFNB7/11, respectively, accounting for ∼2% of genetic hearing loss. Previous work has established the efficacy of mutation-targeted RNAi in treatment of murine models of autosomal dominant non-syndromic deafness. However, application of such approaches is limited by the infeasibility of development and validation of novel constructs for each variant. We developed an allele-non-specific approach consisting of mutation-agnostic RNAi suppression of both mutant and WT alleles, co-delivered with a knockdown-resistant engineered WT allele with or without the use of woodchuck hepatitis virus post-transcriptional regulatory element (WPRE) to augment transgene expression. This therapeutic construct was delivered into the mature murine model of DFNA36 with an AAV vector and achieved robust hair cell and auditory brainstem response preservation. However, WPRE-enhanced Tmc1 expression resulted in inferior outcomes, suggesting a role for gene dosage optimization in future TMC1 gene therapy development.

本文言語English
ジャーナルLife Science Alliance
6
3
DOI
出版ステータスPublished - 3月 1 2023

ASJC Scopus subject areas

  • 生態学
  • 生化学、遺伝学、分子生物学(その他)
  • 植物科学
  • 健康、毒物学および変異誘発

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