{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,3]],"date-time":"2026-08-03T12:44:36Z","timestamp":1785761076885,"version":"3.56.0"},"reference-count":27,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[2021,5,17]],"date-time":"2021-05-17T00:00:00Z","timestamp":1621209600000},"content-version":"vor","delay-in-days":46,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100005725","name":"CHDI Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100005725","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100017510","name":"UK Dementia Research Institute","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100017510","id-type":"DOI","asserted-by":"publisher"}]},{"name":"DRI Ltd"},{"DOI":"10.13039\/501100000265","name":"UK Medical Research Council","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100000265","id-type":"DOI","asserted-by":"crossref"}]},{"name":"Alzheimer\u2019s Society and Alzheimer\u2019s Research UK"},{"name":"National Institutes of Health New Innovator","award":["DP2NS087949 to V.G."],"award-info":[{"award-number":["DP2NS087949 to V.G."]}]},{"name":"Beckman Institute for CLARITY, Optogenetics and Vector Engineering Research"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,4,5]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>The engineering of the AAV-PHP capsids was an important development for CNS research and the modulation of gene expression in the brain. They cross the blood brain barrier and transduce brain cells after intravenous systemic delivery, a property dependent on the genotype of Ly6a, the AAV-PHP capsid receptor. It is important to determine the transduction efficiency of a given viral preparation, as well as the comparative tropism for different brain cells; however, manual estimation of adeno-associated viral transduction efficiencies can be biased and time consuming. Therefore, we have used the Opera Phenix high-content screening system, equipped with the Harmony processing and analysis software, to reduce bias and develop an automated approach to determining transduction efficiency in the mouse brain. We used R Studio and \u2018gatepoints\u2019 to segment the data captured from coronal brain sections into brain regions of interest. C57BL\/6J and CBA\/Ca mice were injected with an AAV-PHP.B virus containing a green fluorescent protein reporter with a nuclear localization signal. Coronal sections at 600\u2009\u03bcm intervals throughout the entire brain were stained with Hoechst dye, combined with immunofluorescence to NeuN and green fluorescent protein to identify all cell nuclei, neurons and transduced cells, respectively. Automated data analysis was applied to give an estimate of neuronal percentages and transduction efficiencies throughout the entire brain as well as for the cortex, striatum and hippocampus. The data from each coronal section from a given mouse were highly comparable. The percentage of neurons in the C57BL\/6J and CBA\/Ca brains was approximately 40% and this was higher in the cortex than striatum and hippocampus. The systemic injection of AAV-PHP.B resulted in similar transduction rates across the entire brain for C57BL\/6J mice. Approximately 10\u201315% of all cells were transduced, with neuronal transduction efficiencies ranging from 5% to 15%, estimates that were similar across brain regions, and were in contrast to the much more localized transduction efficiencies achieved through intracerebral injection. We confirmed that the delivery of the AAV-PHP.B viruses to the brain from the vasculature resulted in widespread transduction. Our methodology allows the rapid comparison of transduction rates between brain regions producing comparable data to more time-consuming approaches. The methodology developed here can be applied to the automated quantification of any parameter of interest that can be captured as a fluorescent signal.<\/jats:p>","DOI":"10.1093\/braincomms\/fcab105","type":"journal-article","created":{"date-parts":[[2021,5,14]],"date-time":"2021-05-14T19:11:31Z","timestamp":1621019491000},"source":"Crossref","is-referenced-by-count":14,"title":["Use of high-content imaging to quantify transduction of AAV-PHP viruses in the brain following systemic delivery"],"prefix":"10.1093","volume":"3","author":[{"given":"Edward J","family":"Smith","sequence":"first","affiliation":[{"name":"Huntington\u2019s Disease Centre, Department of Neurodegenerative Disease, UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4816-6635","authenticated-orcid":false,"given":"Pamela P","family":"Farshim","sequence":"additional","affiliation":[{"name":"Huntington\u2019s Disease Centre, Department of Neurodegenerative Disease, UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6434-5804","authenticated-orcid":false,"given":"Rachel","family":"Flomen","sequence":"additional","affiliation":[{"name":"Huntington\u2019s Disease Centre, Department of Neurodegenerative Disease, UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel T","family":"Jones","sequence":"additional","affiliation":[{"name":"Huntington\u2019s Disease Centre, Department of Neurodegenerative Disease, UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sean J","family":"McAteer","sequence":"additional","affiliation":[{"name":"Huntington\u2019s Disease Centre, Department of Neurodegenerative Disease, UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Benjamin E","family":"Deverman","sequence":"additional","affiliation":[{"name":"The Stanley Center for Psychiatric Research at the Broad Institute of MIT and Harvard, Cambridge, MA 02142, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Viviana","family":"Gradinaru","sequence":"additional","affiliation":[{"name":"Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91101, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4041-6305","authenticated-orcid":false,"given":"Gillian P","family":"Bates","sequence":"additional","affiliation":[{"name":"Huntington\u2019s Disease Centre, Department of Neurodegenerative Disease, UK Dementia Research Institute at UCL, Queen Square Institute of Neurology, University College London, London WC1N 3BG, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2021,5,17]]},"reference":[{"issue":"4","key":"2021070810535732500_fcab105-B1","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1038\/s41576-019-0205-4","article-title":"Engineering adeno-associated virus vectors for gene therapy","volume":"21","author":"Li","year":"2020","journal-title":"Nat Rev 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