Prolactin-deficient GH3B3 cells are defective in the utilization of the endogenous prolactin promoter yet are fully competent to initiate transcription from a transfected prolactin promoter.

Prolactin-deficient GH3B3 cells are defective in the utilization of the endogenous prolactin promoter yet are fully competent to initiate transcription from a transfected prolactin promoter.
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催乳素缺陷的 GH3B3 细胞在利用内源催乳素启动子方面存在缺陷,但完全有能力从转染的催乳素启动子启动转录。

DOI:
10.1089/dna.1991.10.105
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发表时间:
1991
影响因子:
3.1
通讯作者:
Ivarie,R
Ivarie,R
中科院分区:
生物学4区
文献类型:
--
作者:
Arnold,TE;Farrance,IK;Morris,J;Ivarie,R

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催乳素 (PRL) 基因的转录在野生型 D6、PRL 缺陷型 B3 和回复型 r16 GH3 细胞中进行了分析。与野生型细胞相比,缺陷细胞系中 PRL 基因加工后的核转录物水平显着降低,并且在回复突变细胞系中恢复到高于野生型水平。通过引物延伸和 S1 核酸酶保护测定判断,缺陷系中的稀有 PRL 转录物包含与野生型和回复突变细胞中的转录物相同的 5' 末端,这意味着细胞在利用正常野生型启动子方面存在缺陷。缺陷细胞还含有野生型水平的 PRL 和生长激素特异性转录因子pit-1/GHF-1,并且野生型和缺陷细胞的提取物延迟近端和远端 PRL 启动子区域的各种限制性片段的能力没有差异。缺陷型细胞和野生型细胞同样能够从含有远端和近端启动子元件的转染大鼠 PRL 启动子启动转录。这些观察结果表明,PRL 缺陷细胞在这些 PRL 启动子片段(反式模型)上发挥作用的反式激活因子并没有缺陷。相反,变异细胞中 PRL 启动子的低效使用可能反映了 PRL 基因本身甲基化状态的增加(顺式模型)。
Transcription of the prolactin (PRL) gene has been analyzed in wild-type D6, PRL-deficient B3, and revertant r16 GH3cells. Levels of processed nuclear transcripts from the PRL gene were substantially reduced in the deficient line compared to wild-type cells and returned to greater than wild-type levels in the revertant line. Rare PRL transcripts in the deficient line contained the same 5′ end found on transcripts in wild-type and revertant cells as judged by primer extension and S1nuclease protection assays, implying that the cells are deficient in utilization of the normal wild-type promoter. Deficient cells also contained wild-type levels of the PRL- and growth hormone-specific transcription factor pit-1/GHF-1, and no difference was found in the ability of extracts from wild-type and deficient cells to retard various restriction fragments from both the proximal and the distal PRL promoter regions. The deficient and wild-type cells were equally competent in initiating transcription from a transfected rat PRL promoter containing both the distal and proximal promoter elements. These observations imply that PRL-deficient cells are not defective in atrans-activating factor functioning on these PRL promoter fragments (transmodel). Rather, inefficient use of the PRL promoter in the variant cells may reflect an increased methylation state of the PRL gene itself (cismodel).
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