Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Nucleus. 2012 May-Jun;3(3):290-9. doi: 10.4161/nucl.20327. Epub 2012 May 1.

Profilin is associated with transcriptionally active genes.

Author information

  • 1Department of Molecular Biology & Functional Genomics, Stockholm University, Stockholm, Sweden.

Abstract

We have raised antibodies against the profilin of Chironomus tentans to study the location of profilin relative to chromatin and to active genes in salivary gland polytene chromosomes. We show that a fraction of profilin is located in the nucleus, where profilin is highly concentrated in the nucleoplasm and at the nuclear periphery. Moreover, profilin is associated with multiple bands in the polytene chromosomes. By staining salivary glands with propidium iodide, we show that profilin does not co-localize with dense chromatin. Profilin associates instead with protein-coding genes that are transcriptionally active, as revealed by co-localization with hnRNP and snRNP proteins. We have performed experiments of transcription inhibition with actinomycin D and we show that the association of profilin with the chromosomes requires ongoing transcription. However, the interaction of profilin with the gene loci does not depend on RNA. Our results are compatible with profilin regulating actin polymerization in the cell nucleus. However, the association of actin with the polytene chromosomes of C. tentans is sensitive to RNase, whereas the association of profilin is not, and we propose therefore that the chromosomal location of profilin is independent of actin.

PMID:
22572953
[PubMed - indexed for MEDLINE]
PMCID:
PMC3414406
Free PMC Article

Images from this publication.See all images (8)Free text

PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Landes Bioscience Icon for PubMed Central
    Loading ...
    Write to the Help Desk