Is there a role for trihelix transcription factors in embryo maturation?

被引：43

作者：

Barr, Melissa S. ^{[1
]}

Willmann, Matthew R. ^{[2
]}

Jenik, Pablo D. ^{[3
]}

机构：

[1] Kennard Dale High Sch, Fawn Grove, PA USA

[2] Univ Penn, Dept Biol, Philadelphia, PA 19104 USA

[3] Franklin & Marshall Coll, Dept Biol, Lancaster, PA 17604 USA

来源：

PLANT SIGNALING & BEHAVIOR | 2012年 / 7卷 / 02期

关键词：

Arabidopsis; embryogenesis; maturation; trihelix transcription factor; microRNA;

D O I：

10.4161/psb.18893

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The development of the angiosperm seed includes the accumulation of storage products, the loss of most of its water and the establishment of dormancy. While much is known about the pathways that initiate maturation during mid-embryogenesis or repress it after germination, only recently has it been shown that other mechanisms repress the program during early embryogenesis. Two recent reports have shown that microRNAs are critical regulators of maturation in Arabidopsis early embryogenesis. Two closely related trihelix transcription factors, ASIL1 and ASIL2, were identified as probable partially redundant repressors of early maturation downstream of the microRNA-synthesizing enzyme DICER-LIKE1. An overlap between the genes upregulated in asil1-1 and dcl1-15 mutants support this conclusion. ASIL2 orthologs are found across seed plants, indicating that their role in maturation might be conserved. ASIL1 arose from the ancestral ASIL2 clade by a gene duplication event in the Brassicaceae, although it is not clear whether its function has diverged.

引用

页码：205 / 209

页数：5

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