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Yang Y.,Peking UniversityBeijing 100871China | Li L.,Peking UniversityBeijing 100871China | Qu L.-J.,Peking UniversityBeijing 100871China
Journal of Integrative Plant Biology | Year: 2015

The Mediator complex is an important component of the eukaryotic transcriptional machinery. As an essential link between transcription factors and RNA polymerase II, the Mediator complex transduces diverse signals to genes involved in different pathways. The plant Mediator complex was recently purified and comprises conserved and specific subunits. It functions in concert with transcription factors to modulate various responses. In this review, we summarize the recent advances in understanding the plant Mediator complex and its diverse roles in plant growth, development, defense, non-coding RNA production, response to abiotic stresses, flowering, genomic stability and metabolic homeostasis. In addition, the transcription factors interacting with the Mediator complex are also highlighted. © 2015 Institute of Botany, Chinese Academy of Sciences.

Yang M.,Peking UniversityBeijing 100871China | Wang X.,Tsinghua UniversityBeijing 100084China | Huang H.,Tsinghua UniversityBeijing 100084China | Ren D.,Peking UniversityBeijing 100871China | And 5 more authors.
Journal of Integrative Plant Biology | Year: 2015

Histone modifications affect gene expression, but the mechanism and biological consequence of natural variation in histone modifications remain unclear. Here, we generated genome-wide integrated maps of H3K27me3 modification and transcriptome for Col, C24 and their F1 hybrid. A total of 1,828 genomic regions showing variation in H3K27me3 modification between Col and C24 were identified, most of which were associated with genic regions. Natural variation of H3K27me3 modification between parents could result in allelic bias of H3K27me3 in hybrids. Furthermore, we found that H3K27me3 variation between Col and C24 was negatively correlated with gene expression differences between two accessions, especially with those arising from the cis-effect. Importantly, mutation of CLF, an Arabidopsis methyltransferase for H3K27, altered gene expression patterns between the parents. Together, these data provide insights into natural variation of histone modifications and their association with gene expression differences between Arabidopsis ecotypes. © 2015 Institute of Botany, Chinese Academy of Sciences.

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