Germline reprogramming of heterochromatin in plants.
Germline reprogramming of heterochromatin in plants.
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DOI:
10.1101/sqb.2010.75.064
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Martienssen RA
中科院分区:
文献类型:
--
作者:
Creasey KM;Martienssen RA
Heterochromatin is composed of transposable elements (TEs) and other repeats and was once considered to be a wasteland of redundant genetic material and potentially harmful TE. Therefore, the reprogramming of heterochromatin and subsequent reactivation of TE in the immature seed and pollen is paradoxical in plants. Recent studies have shown that reactivation of TE occurs specifically in germline companion cells, the vegetative nucleus (VN) in pollen and the endosperm in seed. In the ovule, ARGONAUTE 9 (AGO9) not only has a role in silencing TE in the egg cell but also in preventing the formation of multiple asexual gametophytes. We propose that reprogramming of heterochromatin in germline companion cells reveals TE in a controlled manner to expose them within the germline and, by the production of small interfering RNA (siRNA), ensures TE silencing in the next generation. We also propose that the mechanisms evolved to silence TE may actually promote sexual reproduction by inhibiting the formation of asexual gametes.
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影响因子:
64.8
作者:
Lippman, Z;Martienssen, R
通讯作者:
Martienssen, R
影响因子:
11.6
作者:
Della Vedova, CB;Cone, KC
通讯作者:
Cone, KC
影响因子:
4.5
作者:
Josse, Thibaut;Teysset, Laure;Ronsseray, Stephane
通讯作者:
Ronsseray, Stephane
DOI:
10.1038/nrg2719
发表时间:
2010-03
期刊:
Nature reviews. Genetics
影响因子:
--
作者:
通讯作者:
--
影响因子:
12.3
作者:
Honys D;Twell D
通讯作者:
Twell D