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Human ribosomal protein S13 regulates expression of its own gene at the splicing step by a feedback mechanism.

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journal contribution
posted on 24.10.2012, 08:58 by Alexey A. Malygin, N. M. Parakhnevitch, A. V. Ivanov, Ian C. Eperon, G. G. Karpova
The expression of ribosomal protein (rp) genes is regulated at multiple levels. In yeast, two genes are autoregulated by feedback effects of the protein on pre-mRNA splicing. Here, we have investigated whether similar mechanisms occur in eukaryotes with more complicated and highly regulated splicing patterns. Comparisons of the sequences of ribosomal protein S13 gene (RPS13) among mammals and birds revealed that intron 1 is more conserved than the other introns. Transfection of HEK 293 cells with a minigene-expressing ribosomal protein S13 showed that the presence of intron 1 reduced expression by a factor of four. Ribosomal protein S13 was found to inhibit excision of intron 1 from rpS13 pre-mRNA fragment in vitro. This protein was shown to be able to specifically bind the fragment and to confer protection against ribonuclease cleavage at sequences near the 5' and 3' splice sites. The results suggest that overproduction of rpS13 in mammalian cells interferes with splicing of its own pre-mRNA by a feedback mechanism. The expression of ribosomal protein (rp) genes is regulated at multiple levels. In yeast, two genes are autoregulated by feedback effects of the protein on pre-mRNA splicing. Here, we have investigated whether similar mechanisms occur in eukaryotes with more complicated and highly regulated splicing patterns. Comparisons of the sequences of ribosomal protein S13 gene (RPS13) among mammals and birds revealed that intron 1 is more conserved than the other introns. Transfection of HEK 293 cells with a minigene-expressing ribosomal protein S13 showed that the presence of intron 1 reduced expression by a factor of four. Ribosomal protein S13 was found to inhibit excision of intron 1 from rpS13 pre-mRNA fragment in vitro. This protein was shown to be able to specifically bind the fragment and to confer protection against ribonuclease cleavage at sequences near the 5′ and 3′ splice sites. The results suggest that overproduction of rpS13 in mammalian cells interferes with splicing of its own pre-mRNA by a feedback mechanism.

Funding

This work was supported by grant from the Russian Fund for Basic Research (No. 05-04-48393-a), grant from Siberian Brunch of the Russian Academy of Sciences for young scientist projects competition in honour of M.A. Lavrentiev (No. 92) to A.V.I. and EMBO Short Term Fellowship (ASTF 8-2005) to A.A.M. Open Access publication charges for this article were waived by Oxford University Press.

History

Citation

Nucleic Acids Research, 2007, 35 (19), pp. 6414-6423

Published in

Nucleic Acids Research

Publisher

Oxford University Press (OUP)

issn

0305-1048

eissn

1362-4962

Copyright date

2007

Available date

24/10/2012

Publisher version

http://nar.oxfordjournals.org/content/35/19/6414

Language

eng