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Article . 2024 . Peer-reviewed
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Nuclear patterns of phosphatidylinositol 4,5‐ and 3,4‐bisphosphate revealed by super‐resolution microscopy differ between the consecutive stages of RNA polymerase II transcription

Authors: Peter Hoboth; Martin Sztacho; Pavel Hozák;

Nuclear patterns of phosphatidylinositol 4,5‐ and 3,4‐bisphosphate revealed by super‐resolution microscopy differ between the consecutive stages of RNA polymerase II transcription

Abstract

Phosphatidylinositol phosphates are powerful signaling molecules that orchestrate signaling and direct membrane trafficking in the cytosol. Interestingly, phosphatidylinositol phosphates also localize within the membrane‐less compartments of the cell nucleus, where they participate in the regulation of gene expression. Nevertheless, current models of gene expression, which include condensates of proteins and nucleic acids, do not include nuclear phosphatidylinositol phosphates. This gap is partly a result of the missing detailed analysis of the subnuclear distribution of phosphatidylinositol phosphates and their relationships with gene expression. Here, we used quantitative dual‐color direct stochastic optical reconstruction microscopy to analyze the nanoscale co‐patterning between RNA polymerase II transcription initiation and elongation markers with respect to phosphatidylinositol 4,5‐ or 3,4‐bisphosphate in the nucleoplasm and nuclear speckles and compared it with randomized data and cells with inhibited transcription. We found specific co‐patterning of the transcription initiation marker P‐S5 with phosphatidylinositol 4,5‐bisphosphate in the nucleoplasm and with phosphatidylinositol 3,4‐bisphosphate at the periphery of nuclear speckles. We showed the specific accumulation of the transcription elongation marker PS‐2 and of nascent RNA in the proximity of phosphatidylinositol 3,4‐bisphosphate associated with nuclear speckles. Taken together, this shows that the distinct spatial associations between the consecutive stages of RNA polymerase II transcription and nuclear phosphatidylinositol phosphates exhibit specificity within the gene expression compartments. Thus, in analogy to the cellular membranes, where phospholipid composition orchestrates signaling pathways and directs membrane trafficking, we propose a model in which the phospholipid identity of gene expression compartments orchestrates RNA polymerase II transcription.

Countries
Czech Republic, Czech Republic
Related Organizations
Keywords

nucleoplasm, speckles, phosphorylation, kinase, phospholipase-c, association, quantitative direct stochastic optical reconstruction microscopy dSTORM, phosphoinositides, organization, ctd, nuclear architecture, swiss 3t3-cells, gene expression, cells, nuclear speckles

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    influence
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
3
Average
Average
Average
Green
hybrid