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As a key platform for gene therapy vectors, elucidating HAdV\u2019s virulence factors is vital for optimizing therapeutic applications and mitigating risks. To achieve productive replication, HAdV strategically neutralizes host immune defenses and induces S-phase pathways essential for viral propagation. This review synthesizes the latest insights into the key pathways through which HAdVs harness these early proteins to enhance virulence, skilfully evading and counteracting host defense mechanisms while propelling viral replication. As foundational platforms for gene therapy vectors (e.g., in oncology and rare disease treatments) and vaccine backbones (e.g., COVID-19 vaccines like ChAdOx1), understanding HAdV\u2019s immunoshadowing\u2014the multifaceted strategies used to cloak innate and adaptive immunity\u2014is crucial for enhancing vector safety and efficacy. Recent insights unveil how early viral proteins\u2014including E1A, E1B-55K, E4orf1, E4orf3, E4orf6, and the E3 complex\u2014participate in these processes. This review critically synthesizes these pathways, evaluating study limitations such as reliance on immortalized cell lines that underestimate the role of these proteins in immunological competent cells, and addresses unresolved controversies, including differential immunoshadowing efficacy across HAdV species that impacts vaccine design.<\/jats:p>","DOI":"10.3390\/cells15090746","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T12:00:32Z","timestamp":1776859232000},"page":"746","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Viral Immunoshadow: Early Adenovirus Strategies for Cloaking Innate Immunity with E1A, E4orf1, and Beyond"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0209-3947","authenticated-orcid":false,"given":"Marco","family":"Vezzoli","sequence":"first","affiliation":[{"name":"Molecular and Cell Biology of the Epigenome Laboratory (MCBEL), Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8792-3961","authenticated-orcid":false,"given":"Giorgio","family":"Dieci","sequence":"additional","affiliation":[{"name":"Molecular and Cell Biology of the Epigenome Laboratory (MCBEL), Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0453-0899","authenticated-orcid":false,"given":"Roberto","family":"Ferrari","sequence":"additional","affiliation":[{"name":"Molecular and Cell Biology of the Epigenome Laboratory (MCBEL), Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, 43124 Parma, Italy"},{"name":"Interdepartmental Centre for Innovation in Health Products Biopharmanet-TEC, University of Parma, 43124 Parma, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"4","DOI":"10.1016\/j.molmed.2022.10.001","article-title":"Adenoviruses in medicine: Innocuous pathogen, predator, or partner","volume":"29","author":"MacNeil","year":"2023","journal-title":"Trends Mol. 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