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Molecular and Cellular Biology, March 2008, p. 2047-2058, Vol. 28, No. 6
0270-7306/08/$08.00+0     doi:10.1128/MCB.01861-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

The Histone-Like NF-Y Is a Bifunctional Transcription Factor{triangledown} ,{dagger}

Michele Ceribelli,{ddagger} Diletta Dolfini,{ddagger} Daniele Merico, Raffaella Gatta, Alessandra M. Viganò, Giulio Pavesi, and Roberto Mantovani*

Dipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Via Celoria 26, 20133 Milano, Italy

Received 12 October 2007/ Returned for modification 5 November 2007/ Accepted 27 December 2007

NF-Y is a trimeric transcription factor containing H2A/H2B-like subunits, which specifically binds to the CCAAT box, a common eukaryotic promoter element. To gain insights into NF-Y-dependent transcriptional regulation, we assessed its relationships with positive histone marks by chromatin immunoprecipitation-on-chip and correlative-profiling studies. Unbiased identification of binding sites shows that the majority of genes are bound by NF-Y in the promoter and/or within the coding region. Parallel analysis of H3K9-14ac and H3K4me3 sites indicates that NF-Y loci can be divided in two distinct clusters: (i) a large cohort contains H3K9-14ac and H3K4me3 marks and correlates with expression and (ii) a sizeable group is devoid of these marks and is found on transcriptionally silent genes. Within this class, we find that NF-Y binding is associated with negative histone marks, such as H4K20me3 and H3K27me3. NF-Y removal by a dominant negative NF-YA leads to a decrease in the transcription of expressed genes associated with H3K4me3 and H3K9-14ac, while increasing the levels of many inactive genes. These data indicate that NF-Y is embedded in positive as well as in negative methyl histone marks, serving a dual function in transcriptional regulation, as an activator or as a repressor.

* Corresponding author. Mailing address: Dipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Via Celoria 26, 20133 Milano, Italy. Phone: 39/02/50315005. Fax: 39/02/50315044. E-mail: mantor{at}unimi.it

{triangledown} Published ahead of print on 22 January 2008.

{dagger} Supplemental material for this article may be found at http://mcb.asm.org/.

{ddagger} These authors equally contributed to this work.

Molecular and Cellular Biology, March 2008, p. 2047-2058, Vol. 28, No. 6
0270-7306/08/$08.00+0     doi:10.1128/MCB.01861-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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