A highly conserved intronic sequence is involved in transcriptional regulation of the alpha 1(I) collagen gene.

A highly conserved intronic sequence is involved in transcriptional regulation of the alpha 1(I) collagen gene.
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高度保守的内含子序列参与 α1(I) 胶原蛋白基因的转录调控。

DOI:
10.1091/mbc.1.6.487
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发表时间:
1990
期刊:
Cell regulation
影响因子:
--
通讯作者:
Bornstein,P
Bornstein,P
中科院分区:
--
文献类型:
--
作者:
Liska,DJ;Slack,JL;Bornstein,P

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人α 1(I)胶原基因的第一内含子含有位于碱基+292和+670之间的正向、方向依赖性顺式作用序列。瞬时转染实验表明,该序列在原代鸡肌腱成纤维细胞和来自SV40转化的骨髓基质细胞的人成纤维细胞样细胞系中均具有功能。DNA酶I足迹、甲基化干扰和迁移率变化分析为序列特异性结合活性提供了证据,并显示结合区域对应于也存在于大鼠α 1(I)胶原内含子中的29个碱基对序列。该保守序列含有AP1共有基序。序列特异性结合活性存在于HeLa和成纤维细胞系的核提取物中,但不存在于两种淋巴细胞系的提取物中。AP1共有序列的突变表明该基序是顺式作用元件功能所必需的。这些数据表明,α 1(I)胶原蛋白基因的转录调控涉及内含子的AP1序列和它的同源转录因子之间的相互作用。
The first intron of the human alpha 1(I) collagen gene contains a positive, orientation-dependent cis-acting sequence located between bases +292 and +670. Transient transfection experiments indicate that this sequence is functional in both primary chicken tendon fibroblasts and in a human fibroblast-like cell line derived from SV40-transformed marrow stromal cells. DNase I footprint, methylation interference, and mobility shift analyses provide evidence for a sequence-specific binding activity and show that the region of binding corresponds to a 29-base-pair sequence that is also present in the rat alpha 1(I) collagen intron. This conserved sequence contains an AP1 consensus motif. Sequence-specific binding activity is present in nuclear extracts from HeLa and fibroblast cell lines but not in extracts from two lymphoid cell lines. Mutation of the AP1 consensus sequence indicates that this motif is required for function of the cis-acting element. These data indicate that transcriptional modulation of the alpha 1(I) collagen gene involves an interaction between an intronic AP1-containing sequence and its cognate transcription factors.
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