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• W1991112345 abstract "The five human growth hormone (GH) and chorionic somatomammotropin (CS) genes are located at a single locus on chromosome 17. These genes share extensive nucleotide sequence similarity (∼94%) even in their flanking DNA. yet GH-N is expressed efficiently in the pituitary under the control of the pituitary-specific factor GHF-1Pit-1 and the remaining CS-A, CS-B, CS-L and GH-V genes are transcriptionally active in the placenta. Despite this specificity in vivo, a truncated CS-A promoter can bind GHF-1Pit-1 and allow CS-A promoter activity in pituitary cells in vitro. With a view to assessing whether the placental genes of the GHCS locus possess a different chromatin structure in the pituitary and are, thus, less transcriptionally active than the GH-N gene, we have compared the DNAase I sensitivity of GHCS in isolated pituitary and placenta cell nuclei. Our data indicate that these genes are equally sensitive in isolated human pituitary nuclei. By contrast, the CS-A, CS-B and CS-L genes were significantly (P < 0.05) more sensitive than the GH-N gene in isolated human placenta nuclei. Although just not significant, the GH-V gene was slightly more sensitive than the GH-N gene. This pattern was also seen with nuclei from human choriocarcinoma BeWo and JEG-3 cells, which express low and extremely low levels of CS RNA, respectively, but was distinct from the pattern observed in the non placental human cervical carcinoma HeLa cell line. These data indicate that the inactivity of the CS genes in the pituitary does not correlate with a ‘closed’ chromatin structure. However, they are consistent with a role for a more ‘open’ chromatin conformation in placenta-specific expression, but not necessarily high levels of transcriptional activity." @default.
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• W1991112345 modified "2023-10-15" @default.
• W1991112345 title "Nuclease sensitivity of the human growth hormone-chorionic somatomammotropin locus in pituitary and placenta suggest different mechanisms for tissue-specific regulation" @default.
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• W1991112345 doi "https://doi.org/10.1016/0303-7207(96)03778-1" @default.
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