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- W1964459031 abstract "Oestrogen receptor α (ER-α) gene has two specific promoters, distal (P0) and proximal (P1), which induce almost identical transcripts in size due to different splicing. We examined the methylation at both promoter regions of the ER-α gene using HpaII, a methylation-sensitive restriction enzyme, prior to polymerase chain reaction (PCR) amplification. To confirm the results of PCR-based methylation analysis, Southern hybridization was also performed. Twenty of 29 patients with ER-α-positive tumours and five of 27 with ER-α-negative tumours were unmethylated at the P1 promoter region of the ER-α gene. The incidence of methylation was highly negatively correlated with ER-α expression (P = 0.0002). A similarly negative correlation was observed at the P0 promoter region of the ER-α gene (P = 0.0154). Additionally, the tumours with the ER-α gene hypermethylated at both promoter regions had definitely negative ER-α values. It was suggested that this epigenetic change might control ER-α expression, and might play an important role in the loss of hormone-dependence in breast cancer." @default.
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- W1964459031 date "1999-07-30" @default.
- W1964459031 modified "2023-10-16" @default.
- W1964459031 title "DNA methylation analysis at distal and proximal promoter regions of the oestrogen receptor gene in breast cancers" @default.
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- W1964459031 doi "https://doi.org/10.1038/sj.bjc.6690631" @default.
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