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. 1986 May 27;14(10):4159–4169. doi: 10.1093/nar/14.10.4159

RNA metabolism in nuclei: selective transport of kappa exons from myeloma nuclei and adenoviral transcripts from infected HeLa nuclei.

R Patterson, E Werner, J Fetherston
PMCID: PMC339852  PMID: 2423966

Abstract

Two independent systems and several analytical procedures have been used to establish that isolated mammalian nuclei selectively transport mature RNA polymerase I and II products. Murine myeloma nuclei retain physiologic restriction in our transport assay as assessed by the transport of the immunoglobulin kappa light chain mRNA and 18S and 28S rRNAs. Nearly 50% of the total kappa exons are transported as structurally intact mature mRNA molecules while less than 8% of either pulse-labeled or steady state kappa intron sequences are detected in the transported fraction. Ribosomal external transcribed spacer sequences also are absent in transported RNA. Release of cytoplasmic RNA from the outer nuclear membrane during the transport assay accounts for less than 10% of transported RNA. Nuclei isolated from adenovirus-infected HeLa cells at 20 hours post infection retain cellular actin mRNA and transport viral poly A+RNA. Ribosomal RNA is transported from infected nuclei although at a reduced rate compared to transport from mock-infected nuclei. Inhibition of transport of host mRNA is paralleled by the absence of pulse-labeled actin mRNA in the cytoplasm of infected cells. The implications of our transport data in relationship to intranuclear RNA trafficking are discussed.

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Selected References

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