Two active bamboo mariner-like transposable elements (Ppmar1 and Ppmar2) identified as the transposon-based genetic tools for mutagenesis

Two active bamboo mariner-like transposable elements (Ppmar1 and Ppmar2) identified as the transposon-based genetic tools for mutagenesis
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两个活性竹水手样转座元件(Ppmar1 和 Ppmar2)被鉴定为基于转座子的诱变遗传工具

DOI:
10.1007/s11032-016-0588-2
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发表时间:
2016-12
期刊:
Mol Breeding
影响因子:
--
通讯作者:
汤定钦
汤定钦
中科院分区:
其他
文献类型:
--
作者:
周明兵;胡慧;刘政捷;汤定钦

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竹是世界上最重要的非木材林树种之一,但与其他经济植物相比,其分子育种相对滞后。考虑到杂交和基因修饰的困难,基于转座子的插入诱变可能是竹材分子育种的一种可行的替代方法。系统搜索潜在的活性转座子,在先前的研究中从毛竹中发现了两个全长水手样元件(Ppmar1和Ppmar2)。这两个MLEs都含有完全末端倒置重复序列(TIRs)和全长完整转座酶。两个转座酶含有完整的dna结合基序和一个DD39D催化结构域,这表明Ppmar1和Ppmar2可能具有活性。本研究利用拟南芥的异源转座系统,研究Ppmar1和Ppmar2的转座活性。结果表明,这两个MLEs都可以在拟南芥中转位。Ppmar1和Ppmar2的切除通常是不完美的,因为它们在切除部位留下1-4 bp。Ppmar1和Ppmar2的重新插入都发生在TA二核苷酸上,并倾向于插入TA富区。插入位点是分散的,不连接的。
Bamboo is one of the most important non-timber forest species in the world, but their molecular breeding lags far behind in contrast to other economic plants. Regarding the difficulties of hybridization and gene modification, the transposon-based insertional mutagenesis might be an alternative, feasible way for molecular breeding of bamboo. A systematic search for potential active transposons identified two full-length mariner-like elements (MLEs) (Ppmar1 and Ppmar2) from moso bamboo in the previous study. Both MLEs contain perfect terminal inverted repeats (TIRs) and a full-length intact transposase. Two transposases contain intact DNA-binding motifs and a DD39D catalytic domain which indicates that Ppmar1 and Ppmar2 are likely active. Here, we deployed a heterologous transposition system of Arabidopsis thaliana to study the transposition activity of Ppmar1 and Ppmar2. The results show that both MLEs could transpose in A. thaliana. Excisions of Ppmar1 and Ppmar2 are usually unperfect as they leave 1–4 bp in excision sites. The reinsertions of both Ppmar1 and Ppmar2 occur at TA dinucleotides and prefer to insert into the TA-rich regions. The insertion sites are dispersed and non-linked.
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