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. 1992 Jul 11;20(13):3361–3366. doi: 10.1093/nar/20.13.3361

Variants of the Xenopus laevis ribosomal transcription factor xUBF are developmentally regulated by differential splicing.

A Guimond 1, T Moss 1
PMCID: PMC312490  PMID: 1630907

Abstract

XUBF is a Xenopus ribosomal transcription factor of the HMG-box family which contains five tandemly disposed homologies to the HMG1 & 2 DNA binding domains. XUBF has been isolated as a protein doublet and two cDNAs encoding the two molecular weight variants have been characterised. The major two forms of xUBF identified differ by the presence or absence of a 22 amino acid segment lying between HMG-boxes 3 and 4. Here we show that the mRNAs for these two forms of xUBF are regulated during development and differentiation over a range of nearly 20 fold. By isolating two of the xUBF genes, it was possible to show that both encoded the variable 22 amino acid segment in exon 12. Oocyte splicing assays and the sequencing of PCR-generated cDNA fragments, demonstrated that the transcripts from one of these genes were differentially spliced in a developmentally regulated manner. Transcripts from the second gene were found to be predominantly or exclusively spliced to produce the lower molecular weight form of xUBF. Expression of a high molecular weight form from yet a third gene was also detected. Although the intron-exon structures of the Xenopus and mouse UBF genes were found to be essentially identical, the differential splicing of exon 8 found in mammals, was not detected in Xenopus.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Bachvarov D., Moss T. The RNA polymerase I transcription factor xUBF contains 5 tandemly repeated HMG homology boxes. Nucleic Acids Res. 1991 May 11;19(9):2331–2335. doi: 10.1093/nar/19.9.2331. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Bachvarov D., Normandeau M., Moss T. Heterogeneity in the Xenopus ribosomal transcription factor xUBF has a molecular basis distinct from that in mammals. FEBS Lett. 1991 Aug 19;288(1-2):55–59. doi: 10.1016/0014-5793(91)81002-p. [DOI] [PubMed] [Google Scholar]
  3. Bell S. P., Jantzen H. M., Tjian R. Assembly of alternative multiprotein complexes directs rRNA promoter selectivity. Genes Dev. 1990 Jun;4(6):943–954. doi: 10.1101/gad.4.6.943. [DOI] [PubMed] [Google Scholar]
  4. Bell S. P., Pikaard C. S., Reeder R. H., Tjian R. Molecular mechanisms governing species-specific transcription of ribosomal RNA. Cell. 1989 Nov 3;59(3):489–497. doi: 10.1016/0092-8674(89)90032-9. [DOI] [PubMed] [Google Scholar]
  5. Cathala G., Savouret J. F., Mendez B., West B. L., Karin M., Martial J. A., Baxter J. D. A method for isolation of intact, translationally active ribonucleic acid. DNA. 1983;2(4):329–335. doi: 10.1089/dna.1983.2.329. [DOI] [PubMed] [Google Scholar]
  6. Comai L., Tanese N., Tjian R. The TATA-binding protein and associated factors are integral components of the RNA polymerase I transcription factor, SL1. Cell. 1992 Mar 6;68(5):965–976. doi: 10.1016/0092-8674(92)90039-f. [DOI] [PubMed] [Google Scholar]
  7. De Winter R. F., Moss T. Spacer promoters are essential for efficient enhancement of X. laevis ribosomal transcription. Cell. 1986 Jan 31;44(2):313–318. doi: 10.1016/0092-8674(86)90765-8. [DOI] [PubMed] [Google Scholar]
  8. Del Sal G., Manfioletti G., Schneider C. The CTAB-DNA precipitation method: a common mini-scale preparation of template DNA from phagemids, phages or plasmids suitable for sequencing. Biotechniques. 1989 May;7(5):514–520. [PubMed] [Google Scholar]
  9. Feinberg A. P., Vogelstein B. "A technique for radiolabeling DNA restriction endonuclease fragments to high specific activity". Addendum. Anal Biochem. 1984 Feb;137(1):266–267. doi: 10.1016/0003-2697(84)90381-6. [DOI] [PubMed] [Google Scholar]
  10. Feinberg A. P., Vogelstein B. A technique for radiolabeling DNA restriction endonuclease fragments to high specific activity. Anal Biochem. 1983 Jul 1;132(1):6–13. doi: 10.1016/0003-2697(83)90418-9. [DOI] [PubMed] [Google Scholar]
  11. Gubbay J., Collignon J., Koopman P., Capel B., Economou A., Münsterberg A., Vivian N., Goodfellow P., Lovell-Badge R. A gene mapping to the sex-determining region of the mouse Y chromosome is a member of a novel family of embryonically expressed genes. Nature. 1990 Jul 19;346(6281):245–250. doi: 10.1038/346245a0. [DOI] [PubMed] [Google Scholar]
  12. Hisatake K., Nishimura T., Maeda Y., Hanada K., Song C. Z., Muramatsu M. Cloning and structural analysis of cDNA and the gene for mouse transcription factor UBF. Nucleic Acids Res. 1991 Sep 11;19(17):4631–4637. doi: 10.1093/nar/19.17.4631. [DOI] [PMC free article] [PubMed] [Google Scholar]
  13. Jantzen H. M., Admon A., Bell S. P., Tjian R. Nucleolar transcription factor hUBF contains a DNA-binding motif with homology to HMG proteins. Nature. 1990 Apr 26;344(6269):830–836. doi: 10.1038/344830a0. [DOI] [PubMed] [Google Scholar]
  14. Kawasaki E. S., Clark S. S., Coyne M. Y., Smith S. D., Champlin R., Witte O. N., McCormick F. P. Diagnosis of chronic myeloid and acute lymphocytic leukemias by detection of leukemia-specific mRNA sequences amplified in vitro. Proc Natl Acad Sci U S A. 1988 Aug;85(15):5698–5702. doi: 10.1073/pnas.85.15.5698. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. Kolodrubetz D., Burgum A. Duplicated NHP6 genes of Saccharomyces cerevisiae encode proteins homologous to bovine high mobility group protein 1. J Biol Chem. 1990 Feb 25;265(6):3234–3239. [PubMed] [Google Scholar]
  16. Kolodrubetz D. Consensus sequence for HMG1-like DNA binding domains. Nucleic Acids Res. 1990 Sep 25;18(18):5565–5565. doi: 10.1093/nar/18.18.5565. [DOI] [PMC free article] [PubMed] [Google Scholar]
  17. Krieg P. A. Improved synthesis of full-length RNA probe at reduced incubation temperatures. Nucleic Acids Res. 1990 Nov 11;18(21):6463–6463. doi: 10.1093/nar/18.21.6463. [DOI] [PMC free article] [PubMed] [Google Scholar]
  18. Krieg P. A., Melton D. A. In vitro RNA synthesis with SP6 RNA polymerase. Methods Enzymol. 1987;155:397–415. doi: 10.1016/0076-6879(87)55027-3. [DOI] [PubMed] [Google Scholar]
  19. McStay B., Hu C. H., Pikaard C. S., Reeder R. H. xUBF and Rib 1 are both required for formation of a stable polymerase I promoter complex in X. laevis. EMBO J. 1991 Aug;10(8):2297–2303. doi: 10.1002/j.1460-2075.1991.tb07766.x. [DOI] [PMC free article] [PubMed] [Google Scholar]
  20. Mishima Y., Financsek I., Kominami R., Muramatsu M. Fractionation and reconstitution of factors required for accurate transcription of mammalian ribosomal RNA genes: identification of a species-dependent initiation factor. Nucleic Acids Res. 1982 Nov 11;10(21):6659–6670. doi: 10.1093/nar/10.21.6659. [DOI] [PMC free article] [PubMed] [Google Scholar]
  21. Newport J., Kirschner M. A major developmental transition in early Xenopus embryos: I. characterization and timing of cellular changes at the midblastula stage. Cell. 1982 Oct;30(3):675–686. doi: 10.1016/0092-8674(82)90272-0. [DOI] [PubMed] [Google Scholar]
  22. O'Mahony D. J., Rothblum L. I. Identification of two forms of the RNA polymerase I transcription factor UBF. Proc Natl Acad Sci U S A. 1991 Apr 15;88(8):3180–3184. doi: 10.1073/pnas.88.8.3180. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Parisi M. A., Clayton D. A. Similarity of human mitochondrial transcription factor 1 to high mobility group proteins. Science. 1991 May 17;252(5008):965–969. doi: 10.1126/science.2035027. [DOI] [PubMed] [Google Scholar]
  24. Pikaard C. S., McStay B., Schultz M. C., Bell S. P., Reeder R. H. The Xenopus ribosomal gene enhancers bind an essential polymerase I transcription factor, xUBF. Genes Dev. 1989 Nov;3(11):1779–1788. doi: 10.1101/gad.3.11.1779. [DOI] [PubMed] [Google Scholar]
  25. Pikaard C. S., Smith S. D., Reeder R. H., Rothblum L. rUBF, an RNA polymerase I transcription factor from rats, produces DNase I footprints identical to those produced by xUBF, its homolog from frogs. Mol Cell Biol. 1990 Jul;10(7):3810–3812. doi: 10.1128/mcb.10.7.3810. [DOI] [PMC free article] [PubMed] [Google Scholar]
  26. Rappolee D. A., Brenner C. A., Schultz R., Mark D., Werb Z. Developmental expression of PDGF, TGF-alpha, and TGF-beta genes in preimplantation mouse embryos. Science. 1988 Sep 30;241(4874):1823–1825. doi: 10.1126/science.3175624. [DOI] [PubMed] [Google Scholar]
  27. Rappolee D. A., Mark D., Banda M. J., Werb Z. Wound macrophages express TGF-alpha and other growth factors in vivo: analysis by mRNA phenotyping. Science. 1988 Aug 5;241(4866):708–712. doi: 10.1126/science.3041594. [DOI] [PubMed] [Google Scholar]
  28. Reeves R., Nissen M. S. The A.T-DNA-binding domain of mammalian high mobility group I chromosomal proteins. A novel peptide motif for recognizing DNA structure. J Biol Chem. 1990 May 25;265(15):8573–8582. [PubMed] [Google Scholar]
  29. Riley D. E. Very rapid nucleotide sequence analysis of improved, double-stranded minipreps. Gene. 1989 Jan 30;75(1):193–196. doi: 10.1016/0378-1119(89)90396-x. [DOI] [PubMed] [Google Scholar]
  30. Schnapp A., Clos J., Hädelt W., Schreck R., Cvekl A., Grummt I. Isolation and functional characterization of TIF-IB, a factor that confers promoter specificity to mouse RNA polymerase I. Nucleic Acids Res. 1990 Mar 25;18(6):1385–1393. doi: 10.1093/nar/18.6.1385. [DOI] [PMC free article] [PubMed] [Google Scholar]
  31. Schnapp A., Rosenbauer H., Grummt I. Trans-acting factors involved in species-specificity and control of mouse ribosomal gene transcription. 1991 May 29-Jun 12Mol Cell Biochem. 104(1-2):137–147. doi: 10.1007/BF00229813. [DOI] [PubMed] [Google Scholar]
  32. Sinclair A. H., Berta P., Palmer M. S., Hawkins J. R., Griffiths B. L., Smith M. J., Foster J. W., Frischauf A. M., Lovell-Badge R., Goodfellow P. N. A gene from the human sex-determining region encodes a protein with homology to a conserved DNA-binding motif. Nature. 1990 Jul 19;346(6281):240–244. doi: 10.1038/346240a0. [DOI] [PubMed] [Google Scholar]
  33. Smith S. D., Oriahi E., Lowe D., Yang-Yen H. F., O'Mahony D., Rose K., Chen K., Rothblum L. I. Characterization of factors that direct transcription of rat ribosomal DNA. Mol Cell Biol. 1990 Jun;10(6):3105–3116. doi: 10.1128/mcb.10.6.3105. [DOI] [PMC free article] [PubMed] [Google Scholar]
  34. Tower J., Culotta V. C., Sollner-Webb B. Factors and nucleotide sequences that direct ribosomal DNA transcription and their relationship to the stable transcription complex. Mol Cell Biol. 1986 Oct;6(10):3451–3462. doi: 10.1128/mcb.6.10.3451. [DOI] [PMC free article] [PubMed] [Google Scholar]
  35. Travis A., Amsterdam A., Belanger C., Grosschedl R. LEF-1, a gene encoding a lymphoid-specific protein with an HMG domain, regulates T-cell receptor alpha enhancer function [corrected]. Genes Dev. 1991 May;5(5):880–894. doi: 10.1101/gad.5.5.880. [DOI] [PubMed] [Google Scholar]

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