Characterization of the major transcripts encoded by the regulatory MuDR transposable element of maize.

Characterization of the major transcripts encoded by the regulatory MuDR transposable element of maize.
复制标题

玉米调节 MuDR 转座元件编码的主要转录本的表征。

DOI:
10.1093/genetics/140.3.1087
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发表时间:
1995
期刊:
影响因子:
3.3
通讯作者:
Walbot,V
Walbot,V
中科院分区:
生物学2区
文献类型:
--
作者:
Hershberger,RJ;Benito,MI;Hardeman,KJ;Warren,C;Chandler,VL;Walbot,V

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MuDR元件控制玉米中Mutator转座元件家族的转座。先前的研究报道了与Mutator活性相关的两种主要MuDR同源转录物的存在。在这项研究中,我们描述了这两个主要的转录本的结构和加工。转录本是会聚的,起始于220 bp末端反向重复序列内元件的相对末端。会聚转录物不重叠,只有200 bp的内部MuDR序列不转录。多个MuDR cDNA的克隆和测序显示不寻常的内含子/外显子连接,差异剪接,和多个多聚腺苷酸化位点。RNA酶保护实验表明,一些剪接失败发生在年轻的幼苗,和低水平的反义RNA存在的两个成绩单。在整个植物水平上,主要MuDR转录本的存在与Mutator活性严格相关,因为在非Mutator或无活性的Mutator原种中没有观察到MuDR转录本。对来自活性Mutator原种的各种组织的检查表明,这两种转录物存在于测试的所有器官和组织中,包括没有明显转座活性的那些。这表明Mutator的活性不仅仅是由主要MuDR转录本的水平控制的。
The MuDR element controls the transposition of the Mutator transposable element family in maize. Previous studies reported the presence of two major MuDR-homologous transcripts that correlate with Mutator activity. In this study, we describe the structure and processing of these two major transcripts. The transcripts are convergent, initiating from opposite ends of the element within the 220-bp terminal inverted repeats. The convergent transcripts do not overlap, and only 200 bp of internal MuDR sequences are not transcribed. Cloning and sequencing of multiple MuDR cDNAs revealed unusual intron/exon junctions, differential splicing, and multiple polyadenylation sites. RNase protection experiments indicated that some splicing failure occurs in young seedlings, and that a low level of antisense RNA exists for both transcripts. On a whole plant level, the presence of the major MuDR transcripts strictly correlates with Mutator activity in that no MuDR transcripts are observed in non-Mutator or inactive Mutator stocks. Examination of various tissues from active Mutator stocks indicates that the two transcripts are present in all organs and tissues tested, including those with no apparent transposition activity. This suggests that Mutator activity is not simply controlled by the level of the major MuDR transcripts.
DOI: 10.1002/j.1460-2075.1990.tb07625.x
发表时间: 1990-12-01
期刊: EMBO JOURNAL
影响因子: 11.4
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发表时间: 1981
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期刊: Trends in genetics : TIG
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