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Extinction of alpha-fetoprotein gene expression in somatic cell hybrids involves cis-acting DNA elements. 总被引:4,自引:0,他引:4
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alpha-Fetoprotein (AFP), a liver-specific protein, is extinguished in somatic cell hybrids formed by the fusion of mouse hepatoma cells (BWTG3) with rat fibroblast cells (JF1). Our studies show that the extinction of mouse AFP expression in these somatic cell hybrids may involve at least two cis-acting regulatory domains, i.e., the enhancer elements and a tissue-specific promoter region, which are located in the 5'-flanking region of the AFP gene. 相似文献
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We have previously identified an Msp I site at the 5′ end of the rat albumin gene whose undermethylation is necessary but not sufficient for stable albumin expression in rat hepatoma cells [1]. We have also shown that the extinction of albumin expression in somatic hybrids is not the result of methylation at this site, since for two different crosses, rapid extinction was found to occur in the absence of any de novo methylation of the previously active gene[2]. In the present study, we examine albumin expression and albumin gene methylation for independent hybrid clones isolated from crosses between albumin expressing rat hepatoma cells and cells of two different non-expressing lines. The cells from hybrid clones of both crosses are characterized by stable extinction of albumin expression. Moreover, we find that de novo methylation of the “extinguished” albumin gene can occur in somatic hybrids, but only some weeks after the gene has ceased to be expressed. 相似文献
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The islet beta cell-enriched MafA activator is a key regulator of insulin gene transcription 总被引:13,自引:0,他引:13
Zhao L Guo M Matsuoka TA Hagman DK Parazzoli SD Poitout V Stein R 《The Journal of biological chemistry》2005,280(12):11887-11894
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Insulin enhancer binding protein has helix-loop-helix structure 总被引:4,自引:0,他引:4
Y Shibasaki H Sakura F Takaku M Kasuga 《Biochemical and biophysical research communications》1990,170(1):314-321