DIFFERENTIATION OF OOCYTE-TYPE AND SOMATIC-TYPE 5S RIBOSOMAL-RNAS IN ANIMALS
DIFFERENTIATION OF OOCYTE-TYPE AND SOMATIC-TYPE 5S RIBOSOMAL-RNAS IN ANIMALS
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DOI：
10.1093/oxfordjournals.jbchem.a121723
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发表时间：
1986-08-01
影响因子：
2.7
通讯作者：
TAKEMURA, S
中科院分区：
文献类型：
--
作者：
KOMIYA, H;HASEGAWA, M;TAKEMURA, S
在一些两栖动物和硬骨鱼中，卵母细胞和体细胞类型的5S rRNA基因在卵母细胞和体细胞中表达不同。为了确定这种差异表达系统出现在动物进化的哪个阶段以及它是如何调控的，我们分析了三种无脊椎动物(海胆、海兔和家蚕)和两种脊椎动物(七鳃鳗和雏鸟)的卵母细胞和体细胞5S rRNA的序列。研究发现，七鳃鳗卵母细胞的5S rRNA由两个组分组成，而体细胞的5S rRNA仅由一个组分组成。在其他动物中，未见5S rRNA在卵母细胞和体细胞中的差异表达。用最大简约法构建了63个动物5S rRNA的系统发育树，并对卵母细胞和体细胞型5S rRNA的进化进行了讨论。
In some amphibians and bony fishes, oocyte- and somatic-type 5S rRNA genes are expressed differently in oocytes and somatic cells. In order to determine at what stage of animal evolution this differential expression system appeared and how it is regulated, the sequences of oocyte and somatic 5S rRNAs from three invertebrates (sea urchin, sea, hare and silkworm) and two vertebrates (lamprey and chick) were analyzed. It was found that the oocyte 5S rRNA from lamprey consists of two components, while its somatic 5S rRNA consists of only one. In other animals, such differential expression of 5S rRNA in oocytes and somatic cells was not seen. A phylogenetic tree of 63 animal 5S rRNAs was constructed by means of the maximum parsimony method, and the evolution of oocyte and somatic-type 5S rRNAs was discussed.