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Figure 8


Fig. 8. Model of action of TCL1 in trichome patterning in Arabidopsis. GL1 encodes an R2R3 MYB-type transcription factor. GL3 encodes a bHLH-related transcription factor. TTG1 encodes a WD40 domain-containing protein. GL2 encodes a homeobox transcription factor. TCL1 encodes a single-repeat R3 MYB transcription factor. Other known single-repeat MYB transcription factors, including TRY, CPC, ETC1 and ETC2, are not shown in the model. TTG1, GL3 and GL1 form an activator complex, whereas TCL1, TRY, CPC, ETC1 and ETC2 act as repressors that were proposed to bind GL3, thus limiting the interaction between GL1 and GL3, an interaction that is required to form the TTG1-GL3-GL1 activator complex that regulates the transcription of GL2. As shown in this study, TCL1 can directly suppress the expression of GL1, thereby limiting the transcriptional activity of the TTG1-GL3-GL1 activator complex. It is unclear whether the TTG1-GL3-GL1 activator complex can promote the transcription of TCL1. Arrows indicate positive regulation and the blunt-ended line indicates negative regulation.





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