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来自Xenopus laevis的第二个卵细胞5sDNA的分离和表征

D D Brown, D Carrol, R D Brown

|December 1, 1977

概括

在Xenopus laevis中,一个名为XIt 5S DNA的小DNA组件含有5S核糖体RNA基因. 这种DNA被转录在卵巢中,而不是体细胞中,这表明与主要卵细胞5SDNA类似的调节.

科学领域:

分子生物学分子生物学
遗传学遗传学是一个
在Xenopus laevis的研究中.

背景情况:

鱼的基因组DNA含有5S核糖体RNA (rRNA) 基因的多个副本.
这些基因存在于不同的种群中,包括主要的卵细胞特异型和潜在的其他类型.

研究的目的:

描述Xenopus laevis (XIt 5S DNA) 中含有5S rRNA基因的第二个小DNA组件.
研究XIt 5S DNA的物理,化学和转录性质.

主要方法:

从Xenopus laevis的基因组DNA中净化小DNA组件 (XIt 5S DNA).
分析物理和化学特征,包括基因序列和重复单位长度.
研究XIt 5SRNA在卵巢和体细胞中的转录.

主要成果:

XIt 5S DNA 经过净化和特征化,揭示了具有独特残留的 5S rRNA 基因序列.
它含有大约2000个基因的单双补充,明显少于主要卵细胞5SDNA (约. 24,000) 的时间.
XIt 5S DNA的重复单元的长度均 (大约为5S). 350个基对) 和XIt 5SRNA在卵巢中被转录,但不是体细胞.

结论:

在Xenopus laevis中,XIt 5S DNA代表了5S rRNA基因的独特种群.
它的独特序列和差异转录表明它有一个专门的作用和监管机制.
这些发现暗示,XIt 5S DNA可能与主要卵细胞的5S DNA类似地调节,尽管其副本数量较低,并具有独特的序列特征.

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