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A combination of MEF3 and NFI proteins activates transcription in a subset of fast-twitch muscles.

机译:MEF3和NFI蛋白的组合可激活快速抽动肌肉的一部分中的转录。

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The human aldolase A pM promoter is active in fast-twitch muscles. To understand the role of the different transcription factors which bind to this promoter and determine which ones are responsible for its restricted pattern of expression, we analyzed several transgenic lines harboring different combinations of pM regulatory elements. We show that muscle-specific expression can be achieved without any binding sites for the myogenic factors MyoD and MEF2 and that a 64-bp fragment comprising a MEF3 motif and an NFI binding site is sufficient to drive reporter gene expression in some but, interestingly, not all fast-twitch muscles. A result related to this pattern of expression is that some isoforms of NFI proteins accumulate differentially in fast- and slow-twitch muscles and in distinct fast-twitch muscles. We propose that these isoforms of NFI proteins might provide a molecular basis for skeletal muscle diversity.
机译:人醛缩酶A pM启动子在快肌中有活性。为了了解与该启动子结合的不同转录因子的作用,并确定哪些转录因子对其限制性表达模式负责,我们分析了几种带有pM调控元件不同组合的转基因品系。我们表明,肌肉特异性表达可以在没有任何肌原性因子MyoD和MEF2结合位点的情况下实现,并且包含MEF3基序和NFI结合位点的64 bp片段足以驱动报告基因在某些情况下表达,但有趣的是,并非所有快速抽搐的肌肉。与这种表达模式有关的结果是,NFI蛋白的一些同工型在快和慢肌中和不同的快肌中差异累积。我们建议,NFI蛋白的这些同工型可能为骨骼肌多样性提供分子基础。

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