CENH3 Distribution and Differential Chromatin Modifications During Pollen Development in Rye (Secale Cereale L.)

Overview

Journal Chromosome Res

Date 2011 Apr 20

PMID 21503764

Citations 27

Authors

Andreas Houben

Katrin Kumke

Kiyotaka Nagaki

Gerd Hause

Affiliations

Soon will be listed here.

Abstract

Microgametogenesis in angiosperms results in two structurally and functionally different cells, one generative cell, which subsequently forms the sperm cells, and the vegetative cell. We analysed the chromatin properties of both types of nuclei after first and second pollen mitosis in rye (Secale cereale). The condensed chromatin of generative nuclei is earmarked by an enhanced level of histone H3K4/K9 dimethylation and H3K9 acetylation. The less condensed vegetative nuclei are RNA polymerase II positive. Trimethylation of H3K27 is not involved in transcriptional downregulation of genes located in generative nuclei as H3K27me3 was exclusively detected in the vegetative nuclei. The global level of DNA methylation does not differ between both types of pollen nuclei. In rye, unlike in Arabidopsis thaliana (Ingouff et al. Curr Biol 17:1032-1037 2007; Schoft et al. EMBO Rep 10:1015-1021 2009), centromeric histone H3 is not excluded from the chromatin of the vegetative nucleus and the condensation degree of centromeric and subtelomeric regions did not differ between the generative and vegetative nuclei. Differences between rye and A. thaliana data suggest that the chromatin organization in mature nuclei of pollen grains is not universal across angiosperms.

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