There is now compelling evidence that messenger ribonucleoprotein (mRNP) complexes after the release from the transcription/processing sites execute essentially unhindered Brownian movements in the nucleoplasm and target nuclear pore complexes (NPCs) by chance encounter. For the majority of genes expressed in eukaryotic cells, only single/few transcript copies are generated, which reinforces the stochastic nature of NPC localization. In this paper, I analyse the NPC localization by freely diffusing single mRNPs and discuss the implications for the temporal progression of gene expression and consecutive processes associated with the gene products. To this end, a walk-and-capture model is considered, assuming a spherical nuclear compartment with a partially absorbing boundary. Perfect absorption and perfect reflection mark the extreme outcomes. For this model, the closed-form analytic solution of the first-passage time probability density function (FPT p.d.f.), the mean passage time and variance have been obtained. The FPT p.d.f. enables to calculate the probability that single mRNPs localize the nuclear boundary and dock to NPCs within certain time windows. For freely moving mRNP complexes in osteosarcoma cell nuclei, a mean apparent diffusion coefficient (D) of 0.04 microm2 s(-1) (range 0.01-0.09 microm2 s(-1)) has been reported. Assuming a nuclear radius of 8 microm and D=0.04 microm2 s(-1), the position-averaged minimum mean passage time
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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