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Accurate chromosome segregation at first meiotic division requires AGO4, aprotein involved in RNA-dependent DNA methylation in Arabidopsis thaliana

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Oliver Velasco, Cecilia and Santos Coloma, Juan Luis and Padrillo Orellana, Mónica (2016) Accurate chromosome segregation at first meiotic division requires AGO4, aprotein involved in RNA-dependent DNA methylation in Arabidopsis thaliana. Genetics, 204 (2). pp. 543-553. ISSN 0016-6731, ESSN: 1943-2631

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Official URL: http://www.genetics.org/content/204/2/543



Abstract

RNA-directed DNA methylation (RdDM) pathway is important for the transcriptional repression of transposable elements and for heterochromatin formation. Small RNAs are key players in this process throughout a feedback with both DNA and histone methylation. Taking into account that methylation underlies gene silencing and that there are genes with meiosis-specific expression profiles, we have wondered whether genes involved in RdDM could play a role during this specialized cell division. To address this issue we have characterized meiosis progression in pollen mother cells (PMCs) from Arabidopsis thaliana mutant plants defective for several proteins related to RdDM. The most relevant results were obtained for ago4-1. In this mutant, meiocytes display a slight reduction in chiasma frequency, alterations in chromatin conformation around centromeric regions, lagging chromosomes at anaphase I, and defects in spindle organization. These abnormalities lead to the formation of polyads instead of tetrads at the end of meiosis, and might be responsible for the fertility defects observed in this mutant. Findings reported here highlight an involvement of AGO4 during meiosis by ensuring accurate chromosome segregation at anaphase I.


Item Type:Article
Uncontrolled Keywords:AGO4; Arabidopsis Thaliana; Centromere; Meiosis; RDDM
Subjects:Medical sciences > Biology > Genetics
ID Code:42863
Deposited On:23 May 2017 10:53
Last Modified:10 Dec 2018 15:30

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