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• W2109603695 endingPage "2030" @default.
• W2109603695 startingPage "2025" @default.
• W2109603695 abstract "The low-density lipoprotein receptor (LDLR) plays a major role in cholesterol homeostasis. Mutations in the regulatory region of the LDLR gene, although rare, have been shown to alter transcriptional activity of the gene and can cause familial hypercholesterolaemia (FH). In this study, a transition (c-->t) was identified at nucleotide position -59 within repeat 2 of the LDLR promoter in a South African FH patient of mixed ancestry. By screening 17 family members of the index case for this promoter mutation, two additional single base changes (-124c-->t and-175g-->t) were identified, located at recently described cis- acting regulatory sequences of the LDLR promoter. Both the-59c-->t and the-124c-->t transitions were identified in the normocholesterolaemic son of the index patient. Reporter plasmids containing the normal and mutant promoter fragments were constructed by directional cloning. Transcription studies using a luciferase reporter system demonstrated that the-59c-->t mutation significantly reduces promoter activity in both the presence and absence of sterols ( approximately 40% of normal activity), while the-124c-->t variant increases transcription ( approximately 160%) of the LDLR gene. The intra-familial phenotypic variability observed amongst individuals with the-59c-->t mutation can probably be ascribed to allelic interaction, suggesting that variation in the LDLR promoter region may contribute significantly to the phenotypic expression of FH-related mutations in populations where these mutations prevail." @default.
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• W2109603695 date "1999-10-01" @default.
• W2109603695 modified "2023-09-26" @default.
• W2109603695 title "Mutation -59c-->t in repeat 2 of the LDL receptor promoter: reduction in transcriptional activity and possible allelic interaction in a south african family with familial hypercholesterolaemia" @default.
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• W2109603695 doi "https://doi.org/10.1093/hmg/8.11.2025" @default.
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