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• W1567447620 endingPage "122" @default.
• W1567447620 startingPage "109" @default.
• W1567447620 abstract "Expansins are proteins involved in plant morphogenesis, exerting their effects on cellulose to extend cell walls. Dictyostelium is an organism that possesses expansin-like molecules, but their functions are not known. In this study, we analyzed the expL7 (expansin-like 7) gene, which has been identified as a putative target of Dd-STATa, a Dictyostelium homolog of the metazoan signal transducer and activator of transcription (STAT) proteins. Promoter fragments of the expL7 were fused to a lacZ reporter and the expression patterns determined. As expected from the behavior of the endogenous expL7 gene, the expL7/lacZ fusion gene was downregulated in Dd-STATa null slugs. In the parental strain, the expL7 promoter was activated in the anterior tip region. Mutational analysis of the promoter identified a sequence that was necessary for expression in tip cells. In addition, an activator sequence for pstAB cells was identified. These sequences act in combination with the repressor region to prevent ectopic expL7 expression in the prespore and prestalk regions of the slug and culminant. Although the expL7 null mutant showed no phenotypic change, the expL7 overexpressor showed aberrant stalk formation. These results indicate that the expansin-like molecule is important for morphogenesis in Dictyostelium." @default.
• W1567447620 created "2016-06-24" @default.
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• W1567447620 date "2009-02-01" @default.
• W1567447620 modified "2023-10-16" @default.
• W1567447620 title "Role of an expansin-like molecule in Dictyostelium morphogenesis and regulation of its gene expression by the signal transducer and activator of transcription protein Dd-STATa" @default.
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• W1567447620 doi "https://doi.org/10.1111/j.1440-169x.2009.01086.x" @default.
• W1567447620 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19207182" @default.
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