An Arabidopsis gene encoding a C2H2-domain protein with alternatively spliced transcripts is essential for endosperm development

文献类型： 外文期刊

第一作者： Lu, Xiaoduo

作者： Lu, Xiaoduo;Liang, Qiuju;Fan, Yunliu;Zhang, Chunyi;Lu, Xiaoduo;Li, Yuan;Su, Yanping;Shen, Songdong;Liang, Qiuju;Meng, Hongyan;Fan, Yunliu;Zhang, Chunyi;Li, Sha

作者机构：

关键词： Alternative splicing;Arabidopsis thaliana;C2H2;embryo lethal;endosperm development;nuclear division

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2012 年 63 卷 16 期

页码：

收录情况： SCI

摘要： The endosperm is an essential part of the seed which sustains embryo development and contains storage reserves. Endosperm development involves a series of nuclear divisions in the absence of cytokinesis. In this study, it is shown that a mutant Arabidopsis plant carrying the disrupted At4g24900 gene exhibits severe defects during seed development. At4g24900 encodes a nuclear-localized C2H2-containing protein and the transcripts of this gene are alternatively spliced, consequently producing at least nine differentially spliced isoforms. The heterozygous T-DNA insertion mutation in this gene resulted in abortion of 25% of seeds, and the homozygous mutant allele displayed embryo lethality. Differential interfernce contrast (DIC) analyses revealed that the mutant has endosperm nuclei with more than one nucleolus and an embryo arrested at the globular to heart stage transition. Because this mutant exhibits a titan-like phenotype, it was designated ttl. The TTL gene is preferentially expressed in tissues with quickly dividing cells as revealed in P-TTL::GUS (-glucuronidase) transgenic plants. It is proposed that TTL is likely to function as a key regulator of endosperm nuclear division.

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