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• W2051270549 abstract "mRNAs for acetylcholine receptor genes are highly concentrated in the endplate region of adult skeletal muscle largely as a result of a transcription restricted to the subneural nuclei. To identify the regulatory elements involved, we employed a DNA injection of a plasmid containing a fragment of the acetylcholine receptor delta-subunit gene promoter (positions -839 to +45) linked to the reporter gene lacZ with a nuclear localization signal. Injection of the wild-type construct into mouse leg muscles yielded preferential expression of the reporter gene in the synaptic region. Analysis of various mutant promoters resulted in the identification of a DNA element (positions -60 to -49), referred to as the N box, that plays a critical role in subneural expression. Disruption of this 12-bp element in the context of a mouse delta-subunit promoter from positions -839 to +45 gives widespread expression of the reporter gene throughout the entire muscle fiber, indicating that this element is a silencer that represses delta-subunit gene transcription in extrajunctional areas. On the other hand, this element inserted upstream of a heterologous basal promoter preferentially enhances expression in the endplate region. This element therefore regulates the restricted expression of the delta-subunit gene both as an enhancer at the endplate level and as a silencer in extrajunctional areas. Furthermore, gel-shift experiments with mouse muscle extracts reveal an activity that specifically binds the 6-bp sequence TTCCGG of this element, suggesting that a transcription factor(s) controls the expression of the delta-subunit gene via this element." @default.
• W2051270549 created "2016-06-24" @default.
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• W2051270549 date "1995-11-07" @default.
• W2051270549 modified "2023-10-06" @default.
• W2051270549 title "Identification of a DNA element determining synaptic expression of the mouse acetylcholine receptor delta-subunit gene." @default.
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• W2051270549 doi "https://doi.org/10.1073/pnas.92.23.10624" @default.
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