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. 1982 May 11;10(9):2911–2924. doi: 10.1093/nar/10.9.2911

Micronuclear DNA sequences of Oxytricha fallax homologous to the macronuclear inverted terminal repeat.

D Dawson, G Herrick
PMCID: PMC320664  PMID: 7099969

Abstract

The macronucleus of the protozoan Oxytricha fallax is generated from a micronucleus following conjugation. While the micronucleus contains high molecular weight DNA, the macronucleus contains only short linear DNA molecules which all end in the same 20 bp inverted terminal repeat (Ma-ITR). The Ma-ITR was radioactively labeled and purified for use as a probe in hybridizations to micronuclear and macronuclear DNA. Sequences homologous to the Ma-ITR were detected in micronuclear DNA. The copy number of the repeat in the micronuclear genome is approximately that required to encode the macronuclear DNA termini. The micronuclear copies are found embedded in repeated long sequence blocks.

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Selected References

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  1. Ammermann D., Steinbrück G., von Berger L., Hennig W. The development of the macronucleus in the ciliated protozoan Stylonychia mytilus. Chromosoma. 1974 May 10;45(4):401–429. doi: 10.1007/BF00283386. [DOI] [PubMed] [Google Scholar]
  2. Blackburn E. H., Gall J. G. A tandemly repeated sequence at the termini of the extrachromosomal ribosomal RNA genes in Tetrahymena. J Mol Biol. 1978 Mar 25;120(1):33–53. doi: 10.1016/0022-2836(78)90294-2. [DOI] [PubMed] [Google Scholar]
  3. Bostock C. J., Prescott D. M. Evidence of gene diminution during the formation of the macronucleus in the protozoan, Stylonychia (DNA density-melting curves-micronuclear DNA-polytene chromosomes). Proc Natl Acad Sci U S A. 1972 Jan;69(1):139–142. doi: 10.1073/pnas.69.1.139. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Emery H. S., Weiner A. M. An irregular satellite sequence is found at the termini of the linear extrachromosomal rDNA in Dictyostelium discoideum. Cell. 1981 Nov;26(3 Pt 1):411–419. doi: 10.1016/0092-8674(81)90210-5. [DOI] [PubMed] [Google Scholar]
  5. Englund P. T. Analysis of nucleotide sequences at 3' termini of duplex deoxyribonucleic acid with the use of the T4 deoxyribonucleic acid polymerase. J Biol Chem. 1971 May 25;246(10):3269–3276. [PubMed] [Google Scholar]
  6. Herrick G., Wesley R. D. Isolation and characterization of a highly repetitious inverted terminal repeat sequence from Oxytricha macronuclear DNA. Proc Natl Acad Sci U S A. 1978 Jun;75(6):2626–2630. doi: 10.1073/pnas.75.6.2626. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Johnson E. M. A family of inverted repeat sequences and specific single-strand gaps at the termini of the Physarum rDNA palindrome. Cell. 1980 Dec;22(3):875–886. doi: 10.1016/0092-8674(80)90564-4. [DOI] [PubMed] [Google Scholar]
  8. Kafatos F. C., Jones C. W., Efstratiadis A. Determination of nucleic acid sequence homologies and relative concentrations by a dot hybridization procedure. Nucleic Acids Res. 1979 Nov 24;7(6):1541–1552. doi: 10.1093/nar/7.6.1541. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Kaine B. P., Spear B. B. Nucleotide sequence of a macronuclear gene for actin in Oxytricha fallax. Nature. 1982 Feb 4;295(5848):430–432. doi: 10.1038/295430a0. [DOI] [PubMed] [Google Scholar]
  10. Katzen A. L., Cann G. M., Blackburn E. H. Sequence-specific fragmentation of macronuclear DNA in a holotrichous ciliate. Cell. 1981 May;24(2):313–320. doi: 10.1016/0092-8674(81)90321-4. [DOI] [PubMed] [Google Scholar]
  11. Lauth M. R., Spear B. B., Heumann J., Prescott D. M. DNA of ciliated protozoa: DNA sequence diminution during macronuclear development of Oxytricha. Cell. 1976 Jan;7(1):67–74. doi: 10.1016/0092-8674(76)90256-7. [DOI] [PubMed] [Google Scholar]
  12. Lawn R. M., Heumann J. M., Herrick G., Prescott D. M. The gene-size DNA molecules in Oxytricha. Cold Spring Harb Symp Quant Biol. 1978;42(Pt 1):483–492. doi: 10.1101/sqb.1978.042.01.051. [DOI] [PubMed] [Google Scholar]
  13. Maniatis T., Kee S. G., Efstratiadis A., Kafatos F. C. Amplification and characterization of a beta-globin gene synthesized in vitro. Cell. 1976 Jun;8(2):163–182. doi: 10.1016/0092-8674(76)90001-5. [DOI] [PubMed] [Google Scholar]
  14. Maxam A. M., Gilbert W. A new method for sequencing DNA. Proc Natl Acad Sci U S A. 1977 Feb;74(2):560–564. doi: 10.1073/pnas.74.2.560. [DOI] [PMC free article] [PubMed] [Google Scholar]
  15. O'Farrell P. H., Kutter E., Nakanishi M. A restriction map of the bacteriophage T4 genome. Mol Gen Genet. 1980;179(2):421–435. doi: 10.1007/BF00425473. [DOI] [PMC free article] [PubMed] [Google Scholar]
  16. Oka Y., Shiota S., Nakai S., Nishida Y., Okubo S. Inverted terminal repeat sequence in the macronuclear DNA of Stylonychia pustulata. Gene. 1980 Sep;10(4):301–306. doi: 10.1016/0378-1119(80)90150-x. [DOI] [PubMed] [Google Scholar]
  17. Southern E. M. Detection of specific sequences among DNA fragments separated by gel electrophoresis. J Mol Biol. 1975 Nov 5;98(3):503–517. doi: 10.1016/s0022-2836(75)80083-0. [DOI] [PubMed] [Google Scholar]
  18. Spear B. B. Isolation and mapping of the rRNA genes in the macronucleus of Oxytricha fallax. Chromosoma. 1980;77(2):193–202. doi: 10.1007/BF00329544. [DOI] [PubMed] [Google Scholar]
  19. Steinbrück G., Haas I., Hellmer K. H., Ammermann D. Characterization of macronuclear DNA in five species of ciliates. Chromosoma. 1981;83(2):199–208. doi: 10.1007/BF00286789. [DOI] [PubMed] [Google Scholar]
  20. Swanton M. T., Greslin A. F., Prescott D. M. Arrangement of coding and non-coding sequences in the DNA molecules coding for rRNAs in Oxytricha sp. DNA of ciliated protozoa. VII. Chromosoma. 1980;77(2):203–215. doi: 10.1007/BF00329545. [DOI] [PubMed] [Google Scholar]
  21. Swanton M. T., Heumann J. M., Prescott D. M. Gene-sized DNA molecules of the macronuclei in three species of hypotrichs: size distributions and absence of nicks. DNA of ciliated protozoa. VIII. Chromosoma. 1980;77(2):217–227. doi: 10.1007/BF00329546. [DOI] [PubMed] [Google Scholar]
  22. Wesley R. D. Inverted repetitious sequences in the macronuclear DNA of hypotrichous ciliates. Proc Natl Acad Sci U S A. 1975 Feb;72(2):678–682. doi: 10.1073/pnas.72.2.678. [DOI] [PMC free article] [PubMed] [Google Scholar]
  23. Yao M. C., Yao C. H. Repeated hexanucleotide C-C-C-C-A-A is present near free ends of macronuclear DNA of Tetrahymena. Proc Natl Acad Sci U S A. 1981 Dec;78(12):7436–7439. doi: 10.1073/pnas.78.12.7436. [DOI] [PMC free article] [PubMed] [Google Scholar]

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