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Originally published In Press as doi:10.1074/jbc.M600282200 on June 20, 2006

J. Biol. Chem., Vol. 281, Issue 33, 23456-23463, August 18, 2006
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Differential Stability of Thymidylate Synthase 3'-Untranslated Region Polymorphic Variants Regulated by AUF1*

Rudolf Pullmann, Jr.{ddagger}1, Kotb Abdelmohsen{ddagger}, Ashish Lal{ddagger}, Jennifer L. Martindale{ddagger}, Robert D. Ladner§, and Myriam Gorospe{ddagger}

From the {ddagger}Laboratory of Cellular and Molecular Biology, NIA-IRP, National Institutes of Health, Baltimore, Maryland 21224 and §Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, California 90033

A 6-nucleotide insertion (I)/deletion (D) polymorphism in the 3'-untranslated region of the thymidylate synthase gene was shown to influence mRNA stability, but the molecular basis of this effect has not been elucidated. Here, studies of both endogenous and ectopically expressed thymidylate synthase alleles revealed that the mRNA-binding, decay-promoting protein AUF1 has higher affinity for allele D mRNA. AUF1 overexpression preferentially suppressed D allele mRNA levels, whereas AUF1 silencing selectively elevated D allele mRNA levels. Our results illustrate the functional consequences of ribonucleoprotein associations involving a polymorphic RNA sequence and uncover a novel mechanism of action for non-coding RNA polymorphisms.


Received for publication, January 11, 2006 , and in revised form, June 16, 2006.

* This work was supported by the Intramural Research Program of the NIA, National Institutes of Health. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

1 To whom correspondence should be addressed: Box 12, LCMB, NIA-IRP, National Institutes of Health, 5600 Nathan Shock Dr., Baltimore, MD 21224. Tel.: 410-558-8264; Fax: 410-558-8386; E-mail: pullmannru{at}nih.gov.


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