Journal
CYTOGENETIC AND GENOME RESEARCH
Volume 143, Issue 1-3, Pages 69-77Publisher
KARGER
DOI: 10.1159/000365233
Keywords
Arabidopsis thaliana; Chromatin; Rabl orientation; RNA polymerase II; Secale cereale; Structured illumination microscopy; Transcription factories; Transcription networks
Categories
Ask authors/readers for more resources
RNA polymerase II (RNAPII) is responsible for the transcription of most eukaryotic genes. In mammalian nuclei, RNAPII is mainly localized in relatively few distinct transcription factories. In this study - applying super-resolution microscopy -it is shown that in plants, inactive (non-phosphorylated) and active (phosphorylated) RNAPII modifications compose distinct 'transcription networks' within the euchromatin. These reticulate structures sometimes attach to each other, but they are absent from heterochromatin and nucleoli. The global RNAPII distribution within nuclei is not influenced by interphase chromatin organization such as Rabl (rye) versus non-Rabl (Arabidopsis thaliana) orientation. Replication of sister chromatids without cell division causes endopolyploidy, a phenomenon widespread in plants and animals. Endopolyploidy raises the number of gene copies per nucleus. Here, it is shown that the amounts of active and inactive RNAPII enzymes in differentiated 2-32C leaf nuclei of A. thaliana proportionally increase with rising endopolyploidy. Thus, increasing the transcriptional activity of cells and tissues seems to be an important function of endopolyploidy. (C) 2014 S. Karger AG, Basel
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available