Abstract
Initial expression of the neurofilament light gene coincides with the appearance of postmitotic neurons. To investigate the molecular mechanisms involved in neuron-specific gene expression during embryogenesis, we generated transgenic mice carrying various regions of the human neurofilament light gene (hNF-L) fused to thelacZ reporter gene. We found that 2.3 or 0.3 kb of the hNF-L promoter region directs expression oflacZ in neurons of transgenic embryos. Addition of 1.8 kb hNF-L intragenic sequences (IS) enlarges the neuronal pattern of transgene expression. The 2.3-kb hNF-L promotelacZ-IS construct contains all regulatory elements essential for both spatial and temporal expression of the hNF-L gene during embryogenesis and in the adult. The use of a heterologous promoter demonstrated that the 1.8-kb hNF-L intragenic sequences are sufficient to direct the expression oflacZ in a NF-L-specific manner both temporally and spatially during development and in the adult. We conclude that these hNF-L intragenic sequences containcis-acting DNA regulatory elements that specify neuronal expression. Taken together, these results show that the neurofilament light gene contains separate upstream and intragenic elements, each of which directslacZ expression in embryonic neurons.
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Leconte, L., Semonin, O., Zvara, A. et al. Both upstream and intragenic sequences of the human neurofilament light gene direct expression oflacZ in neurons of transgenic mouse embryos. J Mol Neurosci 5, 273–295 (1994). https://doi.org/10.1007/BF02736727
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DOI: https://doi.org/10.1007/BF02736727