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It is possible that neuron disorder in the developing brain is a critical factor in the development of neuropsychiatric diseases in later life. Previous studies using mouse model of murine CMV (MCMV) infection demonstrated that the viral early antigen (E1 as a product of<jats:italic>e1<\/jats:italic>gene) persists in the postnatal neurons of the hippocampus (HP) and cerebral cortex (CX) after the disappearance of lytic infection from non-neuronal cells in the periventricular (PV) region. Furthermore, neuron-specific activation of the MCMV-<jats:italic>e1<\/jats:italic>-promoter (<jats:italic>e1-pro<\/jats:italic>) was found in the cerebrum of transgenic mice carrying the<jats:italic>e1-pro<\/jats:italic>-<jats:italic>lacZ<\/jats:italic>reporter construct. In this study, in order to elucidate the mechanisms of<jats:italic>e1-pro<\/jats:italic>activation in cerebral neurons during actual MCMV infection, we have generated the recombinant MCMV (rMCMV) carrying long<jats:italic>e1-pro<\/jats:italic>1373- or short<jats:italic>e1-pro<\/jats:italic>448-EGFP reporter constructs. The length of the former, 1373 nucleotides (nt), is similar to that of transgenic mice. rMCMVs and wild type MCMV did not significantly differed in terms of viral replication or E1 expression. rMCMV-infected mouse embryonic fibroblasts showed lytic infection and activation of both promoters, while virus-infected cerebral neurons in primary neuronal cultures demonstrated the non-lytic and persistent infection as well as the activation of<jats:italic>e1-pro<\/jats:italic>-1373, but not -448. In the rMCMV-infected postnatal cerebrum, lytic infection and the activation of both promoters were found in non-neuronal cells of the PV region until postnatal 8\u00a0days (P8), but these disappeared at P12, while the activation of<jats:italic>e1-pro<\/jats:italic>-1373, but not -448 appeared in HP and CX neurons at P8 and were prolonged exclusively in these neurons at P12, with preservation of the neuronal morphology. Therefore,<jats:italic>e1-pro<\/jats:italic>-448 is sufficient to activate E1 expression in non-neuronal cells, however, the upstream sequence from nt -449 to -1373 in<jats:italic>e1-pro<\/jats:italic>-1373 is supposed to work as an enhancer necessary for the neuron-specific activation of<jats:italic>e1-pro<\/jats:italic>, particularly around the second postnatal week. This unique activation of<jats:italic>e1-pro<\/jats:italic>in developing cerebral neurons may be an important factor in the neurodevelopmental disorders induced by congenital CMV infection.<\/jats:p>","DOI":"10.1186\/s40478-021-01139-0","type":"journal-article","created":{"date-parts":[[2021,3,9]],"date-time":"2021-03-09T10:03:37Z","timestamp":1615284217000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Prolonged activation of cytomegalovirus early gene e1-promoter exclusively in neurons during infection of the developing cerebrum"],"prefix":"10.1186","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6347-8402","authenticated-orcid":false,"given":"Isao","family":"Kosugi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshifumi","family":"Arai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Baba","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideya","family":"Kawasaki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshihide","family":"Iwashita","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yoshihiro","family":"Tsutsui","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,3,9]]},"reference":[{"key":"1139_CR1","doi-asserted-by":"publisher","first-page":"10458","DOI":"10.1128\/jvi.73.12.10458-10471.1999","volume":"73","author":"JH Ahn","year":"1999","unstructured":"Ahn JH, Jang WJ, Hayward GS (1999) The human cytomegalovirus IE2 and UL112-113 proteins accumulate in viral DNA replication compartments that initiate from the periphery of promyelocytic leukemia protein-associated nuclear bodies (PODs or ND10). 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