Nucl. Acids Res.-2007-Malygin-6414-23.pdf (3.15 MB)
Human ribosomal protein S13 regulates expression of its own gene at the splicing step by a feedback mechanism.
journal contribution
posted on 2012-10-24, 08:58 authored by Alexey A. Malygin, N. M. Parakhnevitch, A. V. Ivanov, Ian C. Eperon, G. G. KarpovaThe 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. 6414-6423Published in
Nucleic Acids ResearchPublisher
Oxford University Press (OUP)issn
0305-1048eissn
1362-4962Copyright date
2007Available date
2012-10-24Publisher DOI
Publisher version
http://nar.oxfordjournals.org/content/35/19/6414Language
engAdministrator link
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