Enhancer, repressor, and promoter specificities combine to regulate the rat alpha-fetoprotein gene.

Abstract:

:The upstream transcription control region of the rat alpha-fetoprotein (AFP) gene was analyzed using transient expression of CAT genes in HepG2 cells which express the gene; H4C3 cells which repress the AFP gene but express the albumin gene; and four nonexpressing cell lines. Deletion analysis based on the DNA sequence resolved three upstream enhancers corresponding to the mouse AFP enhancers, but showed additional weak effects from flanking sequences. Quantitative experiments demonstrated that the three enhancers were additive when acting through a single promoter and did not confirm the presence of a distal upstream repressor. All three enhancers stimulated the AFP, albumin, or thymidine kinase (tk) promoter in HepG2, but only the tk and albumin promoters in H4C3. Deletion of a proximal repressor region near the AFP promoter allowed expression in H4C3 cells with the AFP promoter. Thus, the liver-specific developmental repressor is near the AFP promoter, and H4C3 cells provide an in vitro system for analysis of this repressor in transfection assays. The repressor region also blocked expression of the SV40 enhancer through the AFP promoter in hepatic and nonhepatic cell lines, but when this enhancer was combined with an AFP promoter from which the repressor region was deleted, the combination showed expression in all six cell lines studied. AFP expression results from a combination of enhancer, promoter, and repressor activities, and the repressor is functional with a heterologous enhancer in a variety of cells.

journal_name

DNA Cell Biol

journal_title

DNA and cell biology

authors

Wen P,Groupp ER,Buzard G,Crawford N,Locker J

doi

10.1089/dna.1991.10.525

subject

Has Abstract

pub_date

1991-09-01 00:00:00

pages

525-36

issue

7

eissn

1044-5498

issn

1557-7430

journal_volume

10

pub_type

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