Fig. 1.

Chromatin landscape at the inner periphery of Arabidopsis nuclei. a Artist impression representing Arabidopsis interphase nuclei and the potential links between nuclear pore complexes (NPC) and contrasting chromatin contexts. Two NPCs neighboring (1) heterochromatic and Polycomb-repressed domains or (2) actively transcribed genes are highlighted within the yellow box. For simplicity, only two chromosomes are shown. Their telomeres are centrally localized, forming nucleolus-associated domains (NADs), whereas their heterochromatic repetitive elements are condensed around centromeric and peri-centromeric regions, forming peripheral chromocenters. According to the rosette organizational model described by Fransz et al. [6], gene-rich euchromatic loops emanate from the chromocenters. A question mark indicates the potential existence of gradually enriched RNA polymerase II transcription microenvironments from the nuclear interior to peripheral regions where mRNA surveillance and export could be favored. b Schematic representation of NUP1-containing NPCs facing diverse chromatin landscapes. NUP1 is densely distributed along the nuclear periphery and protrudes into the lamina-like nuclear matrix. The two NPCs boxed in a are schematically represented. Cc chromocenter, No nucleolus