A complex RARE is required for the majority of Nedd9 embryonic expression.

Abstract:

:Neural precursor cell expressed, developmentally down-regulated 9 (Nedd9, Casl, Hef1, p105cas, Ef1) is a scaffolding protein that assembles complexes involved in regulating cell adhesion, migration, division, and survival. Nedd9 is found very early in the developing embryonic nervous system. A highly conserved complex retinoic acid response element (RARE) is located 485 base pairs (bp) upstream of exon 2B in the promoter of the Nedd9 gene. Mice transgenic for a 5.2 kilobase (kb) region of the 2B Nedd9 promoter containing the RARE upstream of a lacZ reporter gene [Nedd9(RARE)-lacZ] show a large subset of the normal endogenous Nedd9 expression including that in the caudal hindbrain neuroepithelium, spinal cord, dorsal root ganglia (drg) and migrating neural crest (ncc). However, the transgenic mice do not recapitulate the native Nedd9 expression pattern in presumptive rhombomeres (pr) 3 and 5 of the early hindbrain, the base of the neuroepithelium in the midbrain, nor the forebrain telencephalon. Thus, the 5.2 kb region containing the intact RARE drives a large subset of Nedd9 expression, with additional sequences outside of this region needed to define the full complement of expression. When the 5.2 kb construct is modified (eight point mutations) to eliminate responsiveness of the RARE to all-trans retinoic acid (atRA) [Nedd9(mutRARE)-lacZ], virtually all β-galactosidase (β-gal, lacZ) expression is lost. Exposure of Nedd9(RARE)-lacZ transgenic embryos to excess atRA at embryonic day 8.0 (E8.0) leads to rostral ectopic transgene expression within 6 h whereas the Nedd9(mutRARE)-lacZ mutant does not show this effect. Thus the RARE upstream of the Nedd9 2B promoter is necessary for much of the endogenous gene expression during early development as well as ectopic expression in response to atRA.

journal_name

Transgenic Res

journal_title

Transgenic research

authors

Knutson DC,Clagett-Dame M

doi

10.1007/s11248-014-9825-9

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

123-34

issue

1

eissn

0962-8819

issn

1573-9368

journal_volume

24

pub_type

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