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Characterization of a novel adeno-associated viral vector with preferential oligodendrocyte tropism

Abstract

No adeno-associated virus (AAV) capsid has been described in the literature to exhibit a primary oligodendrocyte tropism when a constitutive promoter drives gene expression, which is a significant barrier for efficient in vivo oligodendrocyte gene transfer. The vast majority of AAV vectors, such as AAV1, 2, 5, 6, 8 or 9, exhibit a dominant neuronal tropism in the central nervous system. However, a novel AAV capsid (Olig001) generated using capsid shuffling and directed evolution was recovered after rat intravenous delivery and subsequent capsid clone rescue, which exhibited a >95% tropism for striatal oligodendrocytes after rat intracranial infusion where a constitutive promoter drove gene expression. Olig001 contains a chimeric mixture of AAV1, 2, 6, 8 and 9, but unlike these parental serotypes after intravenous administration Olig001 has very low affinity for peripheral organs, especially the liver. Furthermore, in mixed glial cell cultures, Olig001 exhibits a 9-fold greater binding when compared with AAV8. This novel oligodendrocyte-preferring AAV vector exhibits characteristics that are a marked departure from previously described AAV serotypes.

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Acknowledgements

These studies were supported by Michael J. Fox Foundation and Target ALS grants to TJM, as well as a grant from the Legacy of Angels to SJG. Indirect administrative support for SJG was provided by Research to Prevent Blindness to the UNC Department of Ophthalmology.

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Correspondence to S J Gray or T J McCown.

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Competing interests

SJG and TJM are inventors for a filed patent by UNC that includes the Olig001 capsid and is licensed to Asklepios Biopharmaceutical. They have received royalties from Asklepios Biopharmaceutical for this patent. RJS is a scientific co-founder of Asklepios Biopharmaceutical. The remaining authors declare no conflict of interest.

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Powell, S., Khan, N., Parker, C. et al. Characterization of a novel adeno-associated viral vector with preferential oligodendrocyte tropism. Gene Ther 23, 807–814 (2016). https://doi.org/10.1038/gt.2016.62

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