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Mol. Cell. Biol., Oct 1996, 5792-5800, Vol 16, No. 10
MB McCormick, RM Tamimi, L Snider, A Asakura, D Bergstrom and SJ Tapscott
We have identified two new genes, neuroD2 and neuroD3, on the basis of
their similarity to the neurogenic basic-helix-loop-helix (bHLH) gene
neuroD. The predicted amino acid sequence of neuroD2 shows a high degree of
homology to neuroD and MATH-2/NEX-1 in the bHLH region, whereas neuroD3 is
a more distantly related family member. neuroD3 is expressed transiently
during embryonic development, with the highest levels of expression between
days 10 and 12. neuroD2 is initially expressed at embryonic day 11, with
persistent expression in the adult nervous system. In situ and Northern
(RNA) analyses demonstrate that different regions of the adult nervous
system have different relative amounts of neuroD and neuroD2 RNA. Similar
to neuroD, expression of neuroD2 in developing Xenopus laevis embryos
results in ectopic neurogenesis, indicating that neuroD2 mediates neuronal
differentiation. Transfection of vectors expressing neuroD and neuroD2 into
P19 cells shows that both can activate expression through simple E-
box-driven reporter constructs and can activate a reporter driven by the
neuroD2 promoter region, but the GAP-43 promoter is preferentially
activated by neuroD2. The noncongruent expression pattern and target gene
specificity of these highly related neurogenic bHLH proteins make them
candidates for conferring specific aspects of the neuronal phenotype.
Copyright © 1996, American Society for Microbiology
NeuroD2 and neuroD3: distinct expression patterns and transcriptional activation potentials within the neuroD gene family
Fred Hutchinson Cancer Research Center, Seattle, Washington 98104, USA.
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