Involvement of cDNA in homologous recombination between Ty elements in Saccharomyces cerevisiae

Involvement of cDNA in homologous recombination between Ty elements in Saccharomyces cerevisiae
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cDNA参与酿酒酵母Ty元件同源重组

DOI:
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发表时间:
1992
影响因子:
5.3
通讯作者:
M. Kupiec
M. Kupiec
中科院分区:
生物学2区
文献类型:
--
作者:
C. Melamed;Y. Nevo;M. Kupiec

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在GAL启动子的控制下,将LYS2位点上带有标记Ty1元件(TyUra)的菌株转化为带有不同标记Ty1元件(Ty1Neo)的质粒。当这些菌株在葡萄糖中生长时,检测到涉及TyUra的低水平基因转化事件。在半乳糖上生长时,可以看到基因转换率的增加。这种同源重组不是转位水平增加的结果。当含有内含子的片段插入到Ty1Neo中,一些聚合体将内含子移除,这意味着存在RNA中间体。影响Ty1Neo逆转录酶或逆转录的突变大大降低了半乳糖中重组的诱导。因此,Ty cDNA参与同源基因转化与染色体拷贝的Ty元件。我们的结果对重复序列的家族在整个进化过程中保持同质性的方式有影响。
Strains carrying a marked Ty element (TyUra) in the LYS2 locus were transformed with plasmids bearing a differently marked Ty1 element (Ty1Neo) under the control of the GAL promoter. When these strains were grown in glucose, a low level of gene conversion events involving TyUra was detected. Upon growth on galactose an increase in the rate of gene conversion was seen. This homologous recombination is not the consequence of increased levels of transposition. When an intron-containing fragment was inserted into Ty1Neo, some of the convertants had the intron removed, implying an RNA intermediate. Mutations that affect reverse transcriptase or reverse transcription of Ty1Neo greatly reduce the induction of recombination in galactose. Thus, Ty cDNA is involved in homologous gene conversion with chromosomal copies of Ty elements. Our results have implications about the way families of repeated sequences retain homogeneity throughout evolution.
DOI: 10.1093/genetics/115.2.233
发表时间: 1987-02
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影响因子: 3.3
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