Proper levels of the Arabidopsis cohesion establishment factor CTF7 are essential for embryo and megagametophyte, but not endosperm, development.

Abstract:

:CTF7 is an essential gene in yeast that is required for the formation of sister chromatid cohesion. While recent studies have provided insights into how sister chromatid cohesion is established, less is known about how specifically CTF7 facilitates the formation of cohesion, and essentially nothing is known about how sister chromatid cohesion is established in plants. In this report, we describe the isolation and characterization of CTF7 from Arabidopsis (Arabidopsis thaliana). Arabidopsis CTF7 is similar to Saccharomyces cerevisiae CTF7 in that it lacks an amino-terminal extension, exhibits acetyltransferase activity, and can complement a yeast ctf7 temperature-sensitive mutation. CTF7 transcripts are found throughout the plant, with the highest levels present in buds. Seeds containing T-DNA insertions in CTF7 exhibit mitotic defects in the zygote. Interestingly, the endosperm developed normally in ctf7 seeds, suggesting that CTF7 is not essential for mitosis in endosperm nuclei. Minor defects were observed in female gametophytes of ctf7(+/-) plants, and plants that overexpress CTF7 exhibited female gametophyte lethality. Pollen development appeared normal in both CTF7 knockout and overexpression plants. Therefore, proper levels of CTF7 are critical for female gametophyte and embryo development but not for the establishment of mitotic cohesion during microgametogenesis or during endosperm development.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Jiang L,Yuan L,Xia M,Makaroff CA

doi

10.1104/pp.110.157560

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

820-32

issue

2

eissn

0032-0889

issn

1532-2548

pii

pp.110.157560

journal_volume

154

pub_type

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