Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, USA.
Department of Bioengineering, Rice University, Houston, TX, USA.
Nat Commun. 2024 Jun 10;15(1):4924. doi: 10.1038/s41467-024-48974-y.
Targeted gene delivery to the brain is a critical tool for neuroscience research and has significant potential to treat human disease. However, the site-specific delivery of common gene vectors such as adeno-associated viruses (AAVs) is typically performed via invasive injections, which limit its applicable scope of research and clinical applications. Alternatively, focused ultrasound blood-brain-barrier opening (FUS-BBBO), performed noninvasively, enables the site-specific entry of AAVs into the brain from systemic circulation. However, when used in conjunction with natural AAV serotypes, this approach has limited transduction efficiency and results in substantial undesirable transduction of peripheral organs. Here, we use high throughput in vivo selection to engineer new AAV vectors specifically designed for local neuronal transduction at the site of FUS-BBBO. The resulting vectors substantially enhance ultrasound-targeted gene delivery and neuronal tropism while reducing peripheral transduction, providing a more than ten-fold improvement in targeting specificity in two tested mouse strains. In addition to enhancing the only known approach to noninvasively target gene delivery to specific brain regions, these results establish the ability of AAV vectors to be evolved for specific physical delivery mechanisms.
靶向基因脑内递送是神经科学研究的重要工具,具有治疗人类疾病的巨大潜力。然而,常见基因载体(如腺相关病毒(AAV))的靶向递释通常通过侵入性注射来实现,这限制了其研究和临床应用的适用范围。相反,非侵入性聚焦超声血脑屏障开放(FUS-BBBO)可使 AAV 从全身循环中特异性进入大脑。然而,当与天然 AAV 血清型联合使用时,这种方法的转导效率有限,并且会导致外周器官的大量非期望转导。在这里,我们使用高通量体内选择来工程新型 AAV 载体,专门用于 FUS-BBBO 部位的局部神经元转导。结果载体显著增强了超声靶向基因递送和神经元嗜性,同时减少了外周转导,在两种测试的小鼠品系中靶向特异性提高了十倍以上。除了增强唯一已知的非侵入性靶向特定脑区基因递送的方法外,这些结果还确立了 AAV 载体能够针对特定物理递释机制进化的能力。
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