Transcriptional and Posttranscriptional Silencing of Rodent α1(I) Collagen by a Homologous Transcriptionally Self-Silenced Transgene

Transcriptional and Posttranscriptional Silencing of Rodent α1(I) Collagen by a Homologous Transcriptionally Self-Silenced Transgene
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同源转录自沉默转基因对啮齿动物 α1(I) 胶原的转录和转录后沉默

DOI:
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发表时间:
1999
影响因子:
5.3
通讯作者:
H. Zarbl
H. Zarbl
中科院分区:
生物学2区
文献类型:
--
作者:
M. Bahramian;H. Zarbl

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用携带全长pro-α1(I)胶原基因(pWTC 1)的质粒瞬时转染啮齿动物成纤维细胞,导致内源性转录物迅速减少> 90%,而转基因mRNA检测不到。使用缺失构建体,该基因的两个相邻的5′非编码区被鉴定为在正常和v-fos转化的细胞中引起内源基因的转录沉默,但在非致瘤性回复突变体中不引起内源基因的转录沉默,这表明v-fos转化诱导的α1(I)基因抑制得到部分缓解。转基因的3′端携带一个额外的元件,导致所有细胞(包括回复突变体)中内源基因的转录后沉默。数据表明,转基因是转录自沉默的。转录活性的基因组整合的转基因也允许内源基因的表达,表明pWTC 1中缺失的染色体因子的基因激活。沉默不受反义RNA的调节。内源性前α1(I)胶原基因的沉默与转基因表达水平无关。
ABSTRACT Transient transfection of rodent fibroblasts with plasmids carrying a full-size pro-α1(I) collagen gene (pWTC1) results in rapid reduction of the endogenous transcripts by >90%, while the transgene mRNA is undetectable. Using deletion constructs, two adjacent 5′ noncoding regions of the gene are identified as causing transcriptional silencing of the endogene in normal and v-fos-transformed cells but not in nontumorigenic revertants, which show partial relief from v-fos transformation-induced α1(I) gene suppression. The 3′ end of the transgene carries an additional element(s), causing posttranscriptional silencing of the endogene in all cells including the revertant. Data indicate that the transgenes are transcriptionally self-silenced. Genome-integrated transgenes that are transcriptionally active also allow expression of the endogene, suggesting gene activation by chromosomal factors missing in pWTC1. Silencing is not regulated by antisense RNA. Silencing of the endogenous pro-α1(I) collagen gene is not linked to the level of transgene expression.
α1(I) 胶原蛋白基因的第一个内含子包含多个转录调控元件。
DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
作者:
Bornstein,P;McKay,J
通讯作者: McKay,J
转录的上游激活剂协调提高基因表达的水平和表观遗传稳定性。
DOI: 10.1073/pnas.93.24.13914
发表时间: 1996
影响因子: 11.1
作者:
Magis,W;Fiering,S;Groudine,M;Martin,DI
通讯作者: Martin,DI
DOI: --
发表时间: 1994-10
期刊: Oncogene
影响因子: 8
作者:
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通讯作者: J. V. Van Amsterdam;Y. Wang;R. Sullivan;H. Zarbl
使用回复细胞系来鉴定基因表达中 v-fos 转化特异性改变的靶标。
DOI: --
发表时间: 1990
期刊: Cell growth & differentiation : the molecular biology journal of the American Association for Cancer Research
影响因子: --
作者:
Hoemann,CD;Zarbl,H
通讯作者: Zarbl,H
DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
Lichtler,A;Stover,ML;Angilly,J;Kream,B;Rowe,DW
通讯作者: Rowe,DW