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- W1572507953 abstract "The 5'-upstream region of the rat alpha-fetoprotein (AFP) gene strongly increased de novo methylation of an adjacent chloramphenicol acetyltransferase (CAT) gene upon transfection into F9 mouse embryonal carcinoma cells. The same effect was exerted by a distal 775-base pair (bp) fragment and by 300- and 1-kb fragments preceding the transcriptional start site, but not by other parts of the control region. Further division of the larger, strongly active fragments resulted in a gradual decrease of methylation and clonal variation in the methylation patterns. The effect of the 775-bp fragment did not depend on its orientation. It was ablated by insertion of the mouse metallothionein I promoter between the AFP gene fragment and the CAT gene, but not by its insertion upstream of the AFP gene fragment. Two fragments from the AFP control region increasing methylation contained B1 and B2 small interspersed repetitive elements, respectively. B1 and B2 sequences of different origin also acted strongly to increase methylation. These findings support the idea that mammalian genes contain specific sequences involved in regulating their methylation. The effects of these sequences appear to be exerted in cis, to be dependent on proximity, but not on orientation, and to require an optimal size of 500-700 bp. Small retrotransposon sequences within such elements may be particularly effective in attracting de novo methylation." @default.
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- W1572507953 date "1994-01-01" @default.
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- W1572507953 title "Enhancement of reporter gene de novo methylation by DNA fragments from the alpha-fetoprotein control region." @default.
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- W1572507953 doi "https://doi.org/10.1016/s0021-9258(17)42100-4" @default.
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