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• W2073760131 endingPage "1523" @default.
• W2073760131 startingPage "1514" @default.
• W2073760131 abstract "Activation of genes by heavy metals, notably zinc, cadmium and copper, depends on MTF-1, a unique zinc finger transcription factor conserved from insects to human. Knockout of MTF-1 in the mouse results in embryonic lethality due to liver decay, while knockout of its best characterized target genes, the stress-inducible metallothionein genes I and II, is viable, suggesting additional target genes of MTF-1. Here we report on a multi-pronged search for potential target genes of MTF-1, including microarray screening, SABRE selective amplification, a computer search for MREs (DNA-binding sites of MTF-1) and transfection of reporter genes driven by candidate gene promoters. Some new candidate target genes emerged, including those encoding alpha-fetoprotein, the liver-enriched transcription factor C/EBPalpha and tear lipocalin/von Ebner's gland protein, all of which have a role in toxicity/the cell stress response. In contrast, expression of other cell stress-associated genes, such as those for superoxide dismutases, thioredoxin and heat shock proteins, do not appear to be affected by loss of MTF-1. Our experiments have also exposed some problems with target gene searches. First, finding the optimal time window for detecting MTF-1 target genes in a lethal phenotype of rapid liver decay proved problematical: 12.5-day-old mouse embryos (stage E12.5) yielded hardly any differentially expressed genes, whereas at stage 13.0 reduced expression of secretory liver proteins probably reflected the onset of liver decay, i.e. a secondary effect. Likewise, up-regulation of some proliferation-associated genes may also just reflect responses to the concomitant loss of hepatocytes. Another sobering finding concerns gamma-glutamylcysteine synthetase(hc) (gamma-GCS(hc)), which controls synthesis of the antioxidant glutathione and which was previously suggested to be a target gene contributing to the lethal phenotype in MTF-1 knockout mice. gamma-GCS(hc) mRNA is reduced at the onset of liver decay but MTF-1 null mutant embryos manage to maintain a very high glutathione level until shortly before that stage, perhaps in an attempt to compensate for low expression of metallothioneins, which also have a role as antioxidants." @default.
• W2073760131 created "2016-06-24" @default.
• W2073760131 creator A5004073515 @default.
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• W2073760131 date "2001-04-01" @default.
• W2073760131 modified "2023-10-15" @default.
• W2073760131 title "Target gene search for the metal-responsive transcription factor MTF-1" @default.
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• W2073760131 doi "https://doi.org/10.1093/nar/29.7.1514" @default.
• W2073760131 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/31279" @default.
• W2073760131 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11266553" @default.
• W2073760131 hasPublicationYear "2001" @default.
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