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Number and location of AUUUA motifs: role in regulating transiently
expressed RNAs
M Akashi, G Shaw, M Hachiya, E Elstner, G Suzuki and P Koeffler
Division of Radiation Health, National Institute of Radiological Sciences,
Chiba, Japan.
Many RNAs coding for either cytokines or oncogenes are unstable and have a
short half-life (t1/2). The AUUUA motif is a highly conserved sequence and
is repeated three or more times in the 3' untranslated region (3'UTR) of
RNAs encoding many of these short-lived cytokines and oncogenes. These
sequences can confer instability. In this study, we investigated the role
of number and location of AUUUA motifs in stabilization of RNA. We
introduced 1xATTTA, 2xATTTA, ATTTTTTTA (second adenosine of 2xATTTA was
substituted with a thymidine), 3xATTTA, 5xATTTA, 7xATTTA [AT-rich sequence
from granulocyte-macrophage colony- stimulating factor [GM-CSF] gene
(AT-62)], and GC-62 (GC sequences were substituted for ATTTA sequences in
the 7xATTTA) into the 3'UTR of rabbit beta-globin (R beta G) gene. This
construct also contained the neomycin-resistance gene. These expression
vectors were transfected into human lung fibroblasts (W138), which
constitutively expressed low levels of GM-CSF mRNA. Stable transfectants
were selected by growth in G418. Northern blot analysis of actinomycin
D-treated, stably transfected cells demonstrated that the number of AUUUA
sequences correlated with rapidity of turnover of the chimeric R beta G
mRNA. The rank order of stability was GC-62 = 1xATTTA = 2xATTTA (no RNA
decay at 4 hours) > 3xATTTA = 5xATTTA (t1/2, 4 hours) > 7xATTTA
(t1/2, 2 hours). Stability of mRNA of R beta G also was reduced (t1/2, 2 to
4 hours) when AT-62 was introduced into the second exon of R beta G gene.
In these same cells, the t1/2 of GM-CSF RNA was approximately 10 to 15
minutes, suggesting that the AUUUA motifs cannot alone account for the
rapid degradation of this cytokine mRNA. Phorbol diesters, including 12-
0-tetradecanoyl phorbol 13-acetate (TPA), stabilize a variety of
transiently expressed RNAs, including GM-CSF RNA. We found that TPA
markedly increased (> 30-fold) the accumulation of GM-CSF RNA. In
contrast, TPA was unable to stimulate the levels of the chimeric R beta G
when either 1x, 2x, 3x, or 5xATTTA motifs were fused to 3'UTR, or when
either AT-62 or GC-62 control sequences were fused to the second exon. The
chimeric beta-globin construct with either AT-62 or ATTTTTTTA in the 3'UTR
had only an approximately twofold to threefold increase in
accumulation.(ABSTRACT TRUNCATED AT 400 WORDS)
Volume 83,
Issue 11,
pp. 3182-3187,
06/01/1994
Copyright © 1994 by The American Society of Hematology

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