Position effect takes precedence over target sequence in determination of adenine methylation patterns in the nuclear genome of a eukaryote, Tetrahymena thermophila.

Position effect takes precedence over target sequence in determination of adenine methylation patterns in the nuclear genome of a eukaryote, Tetrahymena thermophila.
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在确定真核生物嗜热四膜虫核基因组中的腺嘌呤甲基化模式时,位置效应优先于目标序列。

DOI:
10.1093/nar/26.20.4566
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发表时间:
1998
影响因子:
14.9
通讯作者:
VanNuland,TA
VanNuland,TA
中科院分区:
生物学2区
文献类型:
--
作者:
Karrer,KM;VanNuland,TA

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四膜虫(Tetrahymena thermophila)大核DNA中约0.8%的腺嘌呤残基被修饰为N6-甲基腺嘌呤。DNA甲基化是位点特异性的,在克隆细胞系之间甲基化模式是恒定的,在体内腺嘌呤残基的修饰似乎只发生在5′-NAT-3′序列上,但没有发现修饰位点的共有序列。在rDNA微型染色体上的新位置,该位点未甲基化。无论序列是以甲基化还是未甲基化状态引入,无论序列相对于DNA复制起点的方向如何,结果都是相同的。数据显示,序列不足以解释四膜虫中的位点特异性甲基化,并认为其他因素决定了DNA甲基化的模式。
Approximately 0.8% of the adenine residues in the macronuclear DNA of the ciliated protozoanTetrahymena thermophilaare modified toN6-methyladenine. DNA methylation is site specific and the pattern of methylation is constant between clonal cell lines.In vivo, modification of adenine residues appears to occur exclusively in the sequence 5′-NAT-3′, but no consensus sequence for modified sites has been found. In this study, DNA fragments containing a site that is uniformly methylated on the 50 copies of the macronuclear chromosome were cloned into the extrachromosomal rDNA. In the novel location on the rDNA minichromosome, the site was unmethylated. The result was the same whether the sequences were introduced in a methylated or unmethylated state and regardless of the orientation of the sequence with respect to the origin of DNA replication. The data show that sequence is insufficient to account for site-specific methylation inTetrahymenaand argue that other factors determine the pattern of DNA methylation.
DOI: 10.1093/nar/18.22.6637
发表时间: 1990-11-25
影响因子: 14.9
作者:
STARGELL, LA;KARRER, KM;GOROVSKY, MA
通讯作者: GOROVSKY, MA
DOI: 10.1073/pnas.75.10.4992
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通讯作者: Karrer,KM
DOI: 10.1073/pnas.83.3.735
发表时间: 1986-02-01
影响因子: 11.1
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