Dynamic nature of cleavage bodies and their spatial relationship to DDX1 bodies, Cajal bodies, and gems.
DDX1 bodies, cleavage bodies, Cajal bodies (CBs), and gems are nuclear suborganelles that contain factors involved in RNA transcription and/or processing. Although all four nuclear bodies can exist as distinct entities, they often colocalize or overlap with each other. To better understand the relationship between these four nuclear bodies, we examined their spatial distribution as a function of the cell cycle. Here, we report that whereas DDX1 bodies, CBs and gems are present throughout interphase, CPSF-100-containing cleavage bodies are predominantly found during S and G2 phases, whereas CstF-64-containing cleavage bodies are primarily observed during S phase. All four nuclear bodies associate with each other during S phase, with cleavage bodies colocalizing with DDX1 bodies, and cleavage bodies/DDX1 bodies residing adjacent to gems and CBs. Although inhibitors of RNA transcription had no effect on DDX1 bodies or cleavage bodies, inhibitors of DNA replication resulted in loss of CstF-64-containing cleavage bodies. A striking effect on nuclear structures was observed with latrunculin B, an inhibitor of actin polymerization, resulting in the formation of needlelike nuclear spicules made up of CstF-64, CPSF-100, RNA, and RNA polymerase II. Our results suggest that cleavage body components are highly dynamic in nature.
Li
Lei
L
Department of Oncology, University of Alberta, Cross Cancer Institute, Edmonton, Alberta T6G 1Z2, Canada.
Roy
Ken
K
Katyal
Sachin
S
Sun
Xuejun
X
Bléoo
Stacey
S
Godbout
Roseline
R
D000199:Actins / Q000378:metabolism; D000818:Animals; D019556:COS Cells; D002453:Cell Cycle; D002522:Chlorocebus aethiops; D039241:Cleavage Stimulation Factor; D020541:Coiled Bodies / Q000737:chemistry* / Q000378:metabolism*; D053487:DEAD-box RNA Helicases; D004261:DNA Replication / Q000187:drug effects; D004285:Dogs; D005347:Fibroblasts / Q000166:cytology; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D008958:Models, Molecular; D041681:NIH 3T3 Cells; D011108:Polymers; D011485:Protein Binding; D021381:Protein Transport; D012313:RNA / Q000235:genetics / Q000378:metabolism; D020365:RNA Helicases / Q000737:chemistry* / Q000378:metabolism* / Q000648:ultrastructure; D016601:RNA-Binding Proteins / Q000378:metabolism; D014158:Transcription, Genetic / Q000187:drug effects
D000199:Actins; C474466:CSTF2T protein, human; D039241:Cleavage Stimulation Factor; D011108:Polymers; D016601:RNA-Binding Proteins; D012313:RNA; C086252:DDX1 protein, human; D053487:DEAD-box RNA Helicases; D020365:RNA Helicases