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• W2024857522 endingPage "e42781" @default.
• W2024857522 startingPage "e42781" @default.
• W2024857522 abstract "Expression divergence is thought to be a hallmark of functional diversification between homologs post duplication. Modification in regulatory elements has been invoked to explain expression divergence after duplication for several MADS-box genes, however, verification of reciprocal loss of cis-regulatory elements is lacking in plants. Here, we report that the evolution of MPF2-like genes has entailed degenerative mutations in a core promoter CArG-box and an auxin response factor (ARF) binding element in the large 1st intron in the coding region. Previously, MPF2-like genes were duplicated into MPF2-like-A and -B through genome duplication in Withania and Tubocapsicum (Withaninae). The calyx of Withania grows exorbitantly after pollination unlike Tubocapsicum, where it degenerates. Besides inflated calyx syndrome formation, MPF2-like transcription factors are implicated in functions both during the vegetative and reproductive development as well as in phase transition. MPF2-like-A of Withania (WSA206) is strongly expressed in sepals, while MPF2-like-B (WSB206) is not. Interestingly, their combined expression patterns seem to replicate the pattern of their closely related hypothetical progenitors from Vassobia and Physalis. Using phylogenetic shadowing, site-directed mutagenesis and motif swapping, we could show that the loss of a conserved CArG-box in MPF2-like-B of Withania is responsible for impeding its expression in sepals. Conversely, loss of an ARE in MPF2-like-A relaxed the constraint on expression in sepals. Thus, the ARE is an active suppressor of MPF2-like gene expression in sepals, which in contrast is activated via the CArG-box. The observed expression divergence in MPF2-like genes due to reciprocal loss of cis-regulatory elements has added to genetic and phenotypic variations in the Withaninae and enhanced the potential of natural selection for the adaptive evolution of ICS. Moreover, these results provide insight into the interplay of floral developmental and hormonal pathways during ICS development and add to the understanding of the importance of polyploidy in plants." @default.
• W2024857522 created "2016-06-24" @default.
• W2024857522 creator A5045984287 @default.
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• W2024857522 date "2012-08-10" @default.
• W2024857522 modified "2023-10-16" @default.
• W2024857522 title "Reciprocal Loss of CArG-Boxes and Auxin Response Elements Drives Expression Divergence of MPF2-Like MADS-Box Genes Controlling Calyx Inflation" @default.
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• W2024857522 doi "https://doi.org/10.1371/journal.pone.0042781" @default.
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