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Nucleic Acids Research, Vol 25, Issue 11 2197-2204, Copyright © 1997 by Oxford University Press

ARTICLES

Control of mouse U1 snRNA gene expression during in vitro differentiation of mouse embryonic stem cells

Y Cheng, E Lund, BW Kahan and JE Dahlberg
Department of Biomolecular Chemistry, University of Wisconsin-Madison, 1300 University Avenue, Madison, WI 53706, USA.

Early in mouse development, two classes of U1 RNAs, mU1a and mU1b, are synthesized, but as development proceeds, transcription of the embryo- specific mU1b genes is selectively down-regulated to a barely detectable level. We show here that during in vitro differentiation of mouse embryonic stem (ES) cells, both exogenously introduced and endogenous U1b genes are subject to normal developmental regulation. Thus, ES cells represent a convenient isogenic system for studying the control of expression of developmentally regulated snRNA genes. Using this system, we have identified a region in the proximal 5'flanking region, located outside the PSE element, that is responsible for differential transcription of the mU1a and mU1b genes in both developing cells and transiently transfected NIH 3T3 cells.
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