Skip Navigation



Nucleic Acids Research Advance Access published online on October 20, 2009
Nucleic Acids Research, doi:10.1093/nar/gkp859
This Article
Right arrow Full Text Freely available
Right arrow Print PDF (6999K) Freely available
Right arrow Screen PDF (413K) Freely available
Right arrow Supplementary Data
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Commercial Re-use Guidelines
for Open Access NAR Content
Google Scholar
Right arrow Articles by Cavalieri, V.
Right arrow Articles by Spinelli, G.
PubMed
Right arrow PubMed Citation
Right arrow Articles by Cavalieri, V.
Right arrow Articles by Spinelli, G.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

© The Author(s) 2009. Published by Oxford University Press.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Gene Regulation, Chromatin and Epigenetics

Promoter activity of the sea urchin (Paracentrotus lividus) nucleosomal H3 and H2A and linker H1 {alpha}-histone genes is modulated by enhancer and chromatin insulator

Vincenzo Cavalieri, Raffaella Melfi and Giovanni Spinelli*

Dipartimento di Biologia Cellulare e dello Sviluppo (Alberto Monroy), Università di Palermo, Parco d'O;rleans II, 90128 Palermo, Italy

*To whom correspondence should be addressed. Tel: +39 091 23897800; Fax: +39 091 16577400; Email: spinelli{at}unipa.it

Received July 23, 2009. Revised September 24, 2009. Accepted September 26, 2009.

Core promoters and chromatin insulators are key regulatory elements that may direct a transcriptional enhancer to prefer a specific promoter in complex genetic loci. Enhancer and insulator flank the sea urchin (Paracentrotus lividus) {alpha}-histone H2A transcription unit in a tandem repeated cluster containing the five histone genes. This article deals with the specificity of interaction between the H2A enhancer-bound MBF-1 activator and histone gene promoters, and with the mechanism that leads the H1 transcripts to peak at about one-third of the value for nucleosomal H3 and H2A mRNAs. To this end, in vivo competition assays of enhancer and insulator functions were performed. Our evidence suggests that the MBF-1 transcription factor participates also in the expression of the H3 gene and that the sns5 insulator buffers the downstream H1 promoter from the H2A enhancer. Altogether, these results provide a clear demonstration of the enhancer-blocking function of a chromatin insulator in a natural gene context. In addition, they suggest that both the H2A enhancer and the sns5 insulator may account for the diverse accumulation of the linker H1 versus the core nucleosomal histones during early development of the sea urchin embryo.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.