Changes in state of the Wx-m5 allele of maize are due to intragenic transposition of Ds.

Changes in state of the Wx-m5 allele of maize are due to intragenic transposition of Ds.
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玉米 Wx-m5 等位基因状态的变化是由于 Ds 的基因内转座造成的。

DOI:
10.1093/genetics/130.1.175
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发表时间:
1992
期刊:
影响因子:
3.3
通讯作者:
Wessler,SR
Wessler,SR
中科院分区:
生物学2区
文献类型:
--
作者:
Weil,CF;Marillonnet,S;Burr,B;Wessler,SR

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WAXY(WX)-M5DS等位基因引起的异常表型的分子基础已被阐明。与大多数DS等位基因不同,WX-M5在没有ac的情况下表现为野生型。我们发现,Wx-M5基因相对于Wx转录的起始位置在-470处含有一个2kb的DS元件,代表了迄今为止植物中最多的5‘插入转座元件等位基因。尽管WX-M5具有野生型表型,但WX-M5的WX酶活性水平降低,表明DS插入影响WX基因的表达。在Ac存在的情况下,Wx-M5核在野生型背景下有零表达的区段,并产生稳定的Wx和不稳定的Wx-m生发衍生物。在检查的20个衍生物中,有17个是Wx-m等位基因,其中至少15个似乎是由于基因内将-470的D转位到Wx基因内的新位置所致。三个Wx-m等位基因含有两个ds元素,一个在-470,另一个在Wx编码序列中。令人惊讶的是,20个衍生物中只有3个是稳定的WX突变体,这些突变体持续了WX和侧翼序列的严重重排。对于大多数其他玉米来说,可转座的元素等位基因、体细胞部分和生发衍生物通常是在元素切除或元素序列缺失后出现的。相反,基因内转座后的元件插入显然对WX-M5的大部分体细胞部门和生发衍生物负责。
The molecular basis for the unusual phenotype conditioned by the waxy(Wx)-m5 Ds allele has been elucidated. Unlike most Ds alleles, Wx-m5 is phenotypically wild-type in the absence of Ac. We find that the Wx-m5 gene contains a 2-kb Ds element at -470 relative to the start of Wx transcription, representing the most 5' insertion of any transposable element allele characterized to date in plants. Despite its wild type phenotype, Wx-m5 has reduced levels of Wx enzymatic activity indicating that Ds insertion influences Wx gene expression. In the presence of Ac, Wx-m5 kernels have sectors of null expression on a wild-type background and give rise to stable wx and unstable wx-m germinal derivatives. Seventeen of 20 derivatives examined are wx-m alleles and at least 15 of these appear to result from intragenic transposition of Ds from -470 to new sites within the Wx gene. Three wx-m alleles contain two Ds elements, one at -470 and a second in Wx coding sequences. Surprisingly, only 3 out of 20 derivatives are stable wx mutants and these have sustained gross rearrangements of Wx and flanking sequences. For most other maize transposable element alleles somatic sectors and germinal derivatives usually arise following element excision or deletions of element sequences. In contrast, element insertion following intragenic transposition is apparently responsible for most of the somatic sectors and germinal derivatives of Wx-m5.
DOI: 10.1126/science.223.4642.1265
发表时间: 1984-01-01
期刊: SCIENCE
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发表时间: 1992
期刊: Genetics
影响因子: 3.3
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发表时间: 1984-01-01
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DOI: --
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期刊:
影响因子: --
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