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- W2120743568 abstract "The position-dependent specification of the hair and non-hair cell types in the Arabidopsis root epidermis provides a simple model for the study of cell fate determination in plants. Several putative transcriptional regulators are known to influence this cell fate decision. Indirect evidence from studies with the maize R gene has been used to suggest that a bHLH transcription factor also participates in this process. We show that two Arabidopsis genes encoding bHLH proteins, GLABRA3 (GL3) and ENHANCER OF GLABRA3 (EGL3), act in a partially redundant manner to specify root epidermal cell fates. Plants homozygous for mutations in both genes fail to specify the non-hair cell type, whereas plants overexpressing either gene produce ectopic non-hair cells. We also find that these genes are required for appropriate transcription of the non-hair specification gene GL2 and the hair cell specification gene CPC, showing that GL3 and EGL3 influence both epidermal cell fates. Furthermore, we show that these bHLH proteins require a functional WER MYB protein for their action, and they physically interact with WER and CPC in the yeast two-hybrid assay. These results suggest a model in which GL3 and EGL3 act together with WER in the N cell position to promote the non-hair cell fate, whereas they interact with the incomplete MYB protein CPC in the H position, which blocks the non-hair pathway and leads to the hair cell fate." @default.
- W2120743568 created "2016-06-24" @default.
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- W2120743568 date "2003-12-29" @default.
- W2120743568 modified "2023-10-16" @default.
- W2120743568 title "The bHLH genes<i>GLABRA3 (GL3)</i>and<i>ENHANCER OF GLABRA3(EGL3)</i>specify epidermal cell fate in the<i>Arabidopsis</i>root" @default.
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- W2120743568 doi "https://doi.org/10.1242/dev.00880" @default.
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