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Molecular and Cellular Biology, September 2006, p. 6993-7004, Vol. 26, No. 18
0270-7306/06/$08.00+0     doi:10.1128/MCB.01060-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Functional Requirement of Noncoding Y RNAs for Human Chromosomal DNA Replication

Christo P. Christov, Timothy J. Gardiner, Dávid Szüts,{dagger} and Torsten Krude*

Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, United Kingdom

Received 13 June 2006/ Returned for modification 6 July 2006/ Accepted 7 July 2006

Noncoding RNAs are recognized increasingly as important regulators of fundamental biological processes, such as gene expression and development, in eukaryotes. We report here the identification and functional characterization of the small noncoding human Y RNAs (hY RNAs) as novel factors for chromosomal DNA replication in a human cell-free system. In addition to protein fractions, hY RNAs are essential for the establishment of active chromosomal DNA replication forks in template nuclei isolated from late-G1-phase human cells. Specific degradation of hY RNAs leads to the inhibition of semiconservative DNA replication in late-G1-phase template nuclei. This inhibition is negated by resupplementation of hY RNAs. All four hY RNAs (hY1, hY3, hY4, and hY5) can functionally substitute for each other in this system. Mutagenesis of hY1 RNA showed that the binding site for Ro60 protein, which is required for Ro RNP assembly, is not essential for DNA replication. Degradation of hY1 RNA in asynchronously proliferating HeLa cells by RNA interference reduced the percentages of cells incorporating bromodeoxyuridine in vivo. These experiments implicate a functional role for hY RNAs in human chromosomal DNA replication.

* Corresponding author. Mailing address: Department of Zoology, University of Cambridge, Downing Street, Cambridge CB2 3EJ, United Kingdom. Phone: 44 1223 330111. Fax: 44 1223 336676. E-mail: tk1{at}mole.bio.cam.ac.uk.

{dagger} Present address: MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom.

Molecular and Cellular Biology, September 2006, p. 6993-7004, Vol. 26, No. 18
0270-7306/06/$08.00+0     doi:10.1128/MCB.01060-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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