Posted by: shrikantmantri | December 21, 2009

A novel strategy of transcription regulation by intragenic nucleosome ordering

via GR-in-Advance by Vaillant, C., Palmeira, L., Chevereau, G., Audit, B., d'Aubenton-Carafa, Y., Thermes, C., Arneodo, A. on 12/1/09


Numerous studies of chromatin structure showed that nucleosome free regions (NFRs) located at 5′ gene ends contribute to transcription initiation regulation. Here, we determine the role of intragenic chromatin structure on gene expression regulation. We show that, along Saccharomyces cerevisiae genes, nucleosomes are highly organized following two types of architecture that depend only on the distance between the NFRs located at the 5′ and 3′ gene ends. In the first type, this distance constrains in vivo the positioning of n nucleosomes regularly organized in a “crystal-like” array. In the second type, this distance is such that the corresponding genes can accommodate either n or (n + 1) nucleosomes, thereby displaying two possible crystal-like arrays of n weakly compacted or n + 1 highly compacted nucleosomes. This adaptability confers “bi-stable” properties to chromatin and is a key to its dynamics. Compared to crystal-like genes, bi-stable genes present higher transcriptional plasticity, higher sensitivity to chromatin regulators, higher H3 turnover rate, and lower H2A.Z enrichment. The results strongly suggest that transcription elongation is facilitated by higher chromatin compaction. The data allow us to propose a new paradigm of transcriptional control mediated by the stability and the level of compaction of the intragenic chromatin architecture and open new ways for investigating eukaryotic gene expression regulation.

Posted via email from Sharing significant bytes —(Shrikant Mantri)

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Categories

%d bloggers like this: