JOURNAL ARTICLE

Transcription-dependence of histone H3 lysine 27 trimethylation at the Arabidopsis polycomb target gene FLC

Diana Mihaela Buzas, Masumi Robertson, E Jean Finnegan, Chris A Helliwell
Plant Journal 2011, 65 (6): 872-81
21276103
The FLC gene encodes a MADS box repressor of flowering that is the main cause of the late-flowering phenotype of many Arabidopsis ecotypes. Expression of FLC is repressed by vernalization; maintenance of this repression is associated with the deposition of histone 3 K27 trimethylation (H3K27me3) at the FLC locus. However, whether this increased H3K27me3 is a consequence of reduced FLC transcription or the cause of transcriptional repression is not well defined. In this study we investigate the effect of changes in transcription rate on the abundance of H3K27me3 in the FLC gene body, a chromatin region that includes sequences required to maintain FLC repression following vernalization. We show that H3K27me3 is inversely correlated with transcription across the FLC gene body in a range of ecotypes and mutants with different flowering times. We demonstrate that the FLC gene body becomes marked with H3K27me3 in the absence of transcription. When transcription of the gene body is directed by an inducible promoter, H3K27me3 is removed following activation of transcription and H3K27me3 is added after transcription is decreased. The rate of addition of H3K27me3 to the FLC transgene following inactivation of transcription is similar to that observed in the FLC gene body following vernalization. Our data suggest that reduction of FLC transcription during vernalization leads to an increase of H3K27me3 levels in the FLC gene body that in turn maintains FLC repression.

Full Text Links

Find Full Text Links for this Article

Discussion

You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read
21276103
×

Save your favorite articles in one place with a free QxMD account.

×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"