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Chow TY, Kunz BA. Evidence that an endo-exonuclease controlled by the NUC2 gene functions in the induction of 'petite' mutations in Saccharomyces cerevisiae. Curr Genet 1991; 20:39-44. [PMID: 1657413 DOI: 10.1007/bf00312763] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Defects in the RAD52 gene of the yeast Saccharomyces cerevisiae reduce the levels of the NUC2 endo-exonuclease by approximately 90% compared to the levels in wild-type strains. To examine the potential role of this nuclease in the induction of mitochondrial 'petite' mutations, congenic RAD52 and rad52-1 haploids were subjected to treatment with ethidium bromide, a well-known inducer of these mutations. The rad52 strain showed a much higher resistance to ethidium bromide-induced petite formation than the corresponding wild-type strain. Two approaches were taken to confirm that this finding reflected the nuclease deficiency, and not some other effect attributable to the rad52-1 mutation. First, a multicopy plasmid (YEp213-10) carrying NUC2 was transformed into a RAD52 strain. This resulted in an increased fraction of spontaneous petite mutations relative to that seen for the same strain without the plasmid and sensitized the strain carrying the plasmid to petite induction by ethidium bromide treatment. Second, a strain having a nuc2 allele that encodes a temperature-sensitive nuclease was treated with ethidium bromide at the restrictive and permissive temperatures. Petite induction was reduced under restrictive conditions. Enzyme assays revealed that the RAD52 (YEp213-10) strain had the highest level of antibody-precipitable NUC2 endo-exonuclease whereas the nuc2 and rad52 mutants had the lowest levels. Furthermore, addition of ethidium bromide to the reaction mixture stimulated the activity of the nuclease on double-stranded DNA. Petite induction by antifolate-mediated thymine nucleotide depletion was also inhibited by inactivation of RAD52 indicating that the effect of reduced NUC2 endo-exonuclease was not restricted to ethidium bromide treatment.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- T Y Chow
- Department of Nuclear Medicine and Radiobiology, University of Sherbrooke, Québec, Canada
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2
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Heude M. The induction of rho- mutants by UV or gamma-rays is independent of the nuclear recombinational repair pathway in Saccharomyces cerevisiae. Mutat Res 1988; 194:151-63. [PMID: 3045532 DOI: 10.1016/0167-8817(88)90017-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In order to discover whether the nuclear recombinational repair pathway also acts on lesions induced in mitochondrial DNA (mtDNA), the possible role of the RAD50, -51, -52, -55 and -56 genes on the induction of rho- mutants by radiations was studied. Such induction appeared to be independent of this pathway. Nevertheless, an efficient induction of respiration-deficient mutants was observed in gamma-irradiated rad52 diploids. We demonstrate that these mutants do not result from a lack of mtDNA repair, but from chromosome losses induced by gamma-rays. Such an impairment of the respiratory ability of diploids by chromosome losses was effectively observed in the aneuploid progeny of unirradiated RAD+ cdc6 diploids incubated at the restrictive temperature.
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Affiliation(s)
- M Heude
- Institut Curie-Biologie, Centre Universitaire, Orsay, France
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3
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DNA Repair in Yeast: Genetic Control and Biological Consequences. ACTA ACUST UNITED AC 1987. [DOI: 10.1016/b978-0-12-035413-9.50005-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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4
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Wilkie D, Evans IH, Egilsson V, Diala ES, Collier D. Mitochondria, cell surface, and carcinogenesis. INTERNATIONAL REVIEW OF CYTOLOGY. SUPPLEMENT 1983; 15:157-189. [PMID: 6343282 DOI: 10.1016/b978-0-12-364376-6.50012-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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Moustacchi E, Heude M. Mutagenesis and repair in yeast mitochondrial DNA. BASIC LIFE SCIENCES 1982; 20:273-301. [PMID: 7052054 DOI: 10.1007/978-1-4613-3476-7_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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7
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Foury F. Repair of mitochondrial DNA in Saccharomyces cerevisiae. Induction of cytoplasmic petite mutants in a nuclear mutant exhibiting thermosensitive mitochondrial deoxyribonuclease activity. J Biol Chem 1982. [DOI: 10.1016/s0021-9258(19)68264-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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8
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Hixon SC, Franks HL, Moustacchi E. Yeast mitochondrial DNA characterization after ultraviolet irradiation. Mutat Res 1980; 73:267-77. [PMID: 7007878 DOI: 10.1016/0027-5107(80)90193-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Yeast mitochondrial (mtDNA) 3H-labelled was isolated from exponential phase cells after ultraviolet light irradiation. Both the size and amount of mtDNA were found to be reduced during a 40-h liquid-holding (LH) period in non-growth medium following irradiation as compared to the mtDNA recovered from nonirradiated cells under similar conditions. After the LH period, previously irradiated cells were resuspended in growth medium containing [14C]adenine. Double labelled mtDNA (3H and 14C) was isolated from cell samples removed during new growth. A recovery in the amount and size of mtDNA was observed in irradiated cells during new growth. These biochemical studies agree with the observed loss and recovery of mtDNA genetic markers in UV-irradiated exponential phase yeast after a period of LH and new growth resp.
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Chanet R, von Borstel RC. Genetic effects of formaldehyde in yeast. III. Nuclear and cytoplasmic mutagenic effects. Mutat Res 1979; 62:239-53. [PMID: 388212 DOI: 10.1016/0027-5107(79)90082-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Low concentrations of formaldehyde induce nuclear mutations when yeast cells are allowed to grow in the presence of this compound. The induction of reversions is a linear function of the concentration and depends upon the repair capacities of the treated cells. A strain defective in excision-repair (rad3-12) is more mutable by formaldehyde than the isogenic wild-type whereas a strain blocked in the mutagenic pathway (rad6-1) is not mutable after the same treatment. Allele specificities were found. In particular the lys1-1 mutation is not reversible by formaldehyde. Higher concentrations of formaldehyde induce efficiently the cytoplasmic "petite" mutation in non-growing conditions when a lethal effect is noticeable. The growth phase as well as the physiological state influence this mutagenic effect. The mutagenic effect of formaldehyde in yeast is discussed in relation with the repair processes involved.
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Johnston LH. Nuclear mutations in Saccharomyces cerevisiae which increase the spontaneous mutation frequency in mitochondrial DNA. MOLECULAR & GENERAL GENETICS : MGG 1979; 170:327-31. [PMID: 379548 DOI: 10.1007/bf00267066] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Fourteen mutants have been identified in which the frequency of spontaneous mutations in mitochondrial DNA is increased. As well as increasing the frequency of mutations to resistance to erythromycin, oligomycin and spiramycin, all the mutants also show changes in the frequency of spontaneous petite induction. None of the mutants has any effect on the frequency of spontaneous nuclear mutations. Nine of the mutants are in one complementation group and five are in another. The phenotype of both groups is caused by a single nuclear mutation.
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11
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12
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Nagley P, Sriprakash KS, Linnane AW. Structure, synthesis and genetics of yeast mitochondrial DNA. Adv Microb Physiol 1977; 16:157-277. [PMID: 343546 DOI: 10.1016/s0065-2911(08)60049-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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14
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Prakash L. The relation between repair of DNA and radiation and chemical mutagenesis in Saccharomyces cerevisiae. Mutat Res 1976; 41:241-8. [PMID: 796716 DOI: 10.1016/0027-5107(76)90097-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The effect of various genes involved in DNA repair functions on radiation and chemical mutagenesis in Escherichia coli is discussed and compared to similar studies done in yeast. Results of the effect of various genes conferring radiation-sensitivity on mutation induction in yeast are presented and related to current ideas of mutagenesis.
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Moustacchi E, Perlman PS, Mahler HR. A novel class of Saccharomyces cerevisiae mutants specifically UV-sensitive to "petite" induction. MOLECULAR & GENERAL GENETICS : MGG 1976; 148:251-61. [PMID: 796662 DOI: 10.1007/bf00332899] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A mutant of Saccharomyces cerevisiae has been isolated which, though exhibiting a normal response to nuclear genetic damage by ultraviolet light (UV), is more sensitive than its wild type specifically in the production of the cytoplasmic (rho-) mutation by this agent. Some of the features of this mutation which has been designated uvsrho 5 are: i) The mutation is recessive, it exhibits a Mendelian, and hence presumably nuclear, pattern of segregation, but manifests its effects specifically and pleiotropically on mitochondrial functions. ii) Mutant cells resemble their wild type parents in a) growth characteristics on glucose; b) in their UV induced dose response to lethality or nuclear mutation and c) the ability of their mitochondrial genome, upon mating with appropriate testers, of transmitting and recombining various markers, albeit with enhanced efficiency. Similarly, d) they are able to modulate the expression of mitochondrial mutagenesis by ethidium bromide. Thus their mitochondrial DNA appears genetically as competent as that of the wild type. iii) Mutant cells differ from their wild type parents in a) growth characteristics on glycerol; b) susceptibility to induction of the mitochondrial (rho-) mutation by various mutagens, in that the rate of spontaneous mutation is slightly and that by UV is significantly enhanced, whild that by ethidium bromide is greatly diminished. Conversely, c) modulating influences resulting in the repair of initial damage are diminished fro UV and stimulated in the case of Berenil. iv) The amount of mitochondrial DNA per cell appears elevated in the mutant, relative to wild type, and its rate of degradation subsequent to a mutagenic exposure to either UV or ethidium bromide is diminished. v) A self-consistent scheme to account for this and all other information so far available for the induction and modulation of the (rho-) mutation is presented. In a previous study it was shown that some nuclear mutants of Saccharomyces cerevisiae, more sensitive to lethal damage induced by ultraviolet light (rad) than their parent wild type (RAD), also exhibit a concomitant modification in sensitivity to both nuclear and cytoplasmic genetic damage (Moustacchi, 1971). However, another class of rad mutants respond to the induction of the cytoplasmic "petite" also designated as rho- (or rho-) mutation by UV in a manner indistinguishable from that of the RAD strain. One possible interpretation of this last observation is that some of the steps in the expression of the UV damage on mitochondrial (mt)DNA may be governed by other nuclear and cytoplasmic genetic determinants, the products of which may then act specifically on mitochondrial lesions. If this assumption is correct, it should be possible to find mutants with a normal response to nuclear damage but specifically UV-sensitive towards induction of (rho-)...
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Mahler HR, Raff RA. The evolutionary origin of the mitochondrion: a nonsymbiotic model. INTERNATIONAL REVIEW OF CYTOLOGY 1976; 43:1-124. [PMID: 131111 DOI: 10.1016/s0074-7696(08)60067-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Prakash L. Repair of pyrimidine dimers in nuclear and mitochondrial DNA of yeast irradiated with low doses of ultraviolet light. J Mol Biol 1975; 98:781-95. [PMID: 1104879 DOI: 10.1016/s0022-2836(75)80010-6] [Citation(s) in RCA: 133] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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19
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Hixon SC, Yielding KL. A synergistic effect of ultraviolet light and ethidium bromide on petite induction in yeast. Mutat Res 1975; 29:159-63. [PMID: 1097909 DOI: 10.1016/0027-5107(75)90031-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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20
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Heude M, Chanet R, Moustacchi E. Protein synthesis and the recovery of both survival and cytoplasmic "petite" mutation in ultraviolet-treated yeast cells. I. Nuclear-directed protein synthesis. Mutat Res 1975; 28:37-45. [PMID: 1095919 DOI: 10.1016/0027-5107(75)90312-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The contribution of nuclear-directed protein synthesis in the repair of lethal and mitochondrial genetic damage after UV-irradiation of exponential and stationary phage haploid yeast cells was examined. This was carried out using cycloheximide (CH), a specific inhibitor of nuclear protein synthesis. It appears that nuclear protein synthesis is required for the increase in survival seen after the liquid holding of cells at both stages, as well as for the "petite" recovery seen after the liquid holding of exponential phase cells. The characteristic negative liquid holding effect observed for the UV induction of "petites" in stationary phase cells (increase of the frequency of "petites" during storage) remained following all the treatments which inhibited nuclear protein synthesis. However, the application of photoreactivating light following dark holding with cycloheximide indicates that some steps of the repair of both nuclear and mitochondrial damage are performed in the absence of a synthesis of proteins.
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Mitochondrial genetics X: Effects of UV irradiation on transmission and recombination of mitochondrial genes in Saccharomyces cerevisiae. ACTA ACUST UNITED AC 1975. [DOI: 10.1007/bf00332539] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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The Present Status of DNA Repair Mechanisms in UV Irradiated Yeast Taken as a Model Eukaryotic System. Radiat Res 1975. [DOI: 10.1016/b978-0-12-523350-7.50062-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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23
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Haynes RH. DNA repair and the genetic control of radiosensitivity in yeast. BASIC LIFE SCIENCES 1975; 5B:529-40. [PMID: 1103868 DOI: 10.1007/978-1-4684-2898-8_17] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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24
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Waters R, Moustacchi E. The fate of ultraviolet-induced pyrimidine dimers in the mitochondrial DNA of Saccharomyces cerevisiae following various post-irradiation cell treatments. BIOCHIMICA ET BIOPHYSICA ACTA 1974; 366:241-50. [PMID: 4609477 DOI: 10.1016/0005-2787(74)90282-2] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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25
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Mahler HR, Bastos RN. Coupling between mitochondrial mutation and energy transduction. Proc Natl Acad Sci U S A 1974; 71:2241-5. [PMID: 4276293 PMCID: PMC388427 DOI: 10.1073/pnas.71.6.2241] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Upon incubation with ethidium bromide (Etd Br) isolated mitochondria of Saccharomyces cerevisiae have been shown to be capable of performing five novel reactions: (a) a single scission of their DNA (mtDNA) coincident with (b) the incorporation of Etd Br into the product (mtDNA --> 2 mtDNA'-Etd Br); (c) an energy- (and probably ATP-) requiring degradation of mtDNA'-Etd Br to acid-labile products. These reactions acting in series generate (d) a DNase dependent on both Etd Br and an energy supply with mtDNA'-Etd Br as an obligatory intermediate. Coincident with (d) there occurs (e) an activation of adenosinetriphosphatase. Experiments with specific inhibitors suggest that the enzyme responsible is the mitochondrial adenosinetriphosphatase complex itself, and that it and the ability to carry out reactions (a) through (e) are tightly coupled to the energy-transducing functions of the particle.
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Lawrence CW, Stewart JW, Sherman F, Christensen R. Specificity and frequency of ultraviolet-induced reversion of an iso-1-cytochrome c ochre mutant in radiation-sensitive strains of yeast. J Mol Biol 1974; 85:137-62. [PMID: 4365620 DOI: 10.1016/0022-2836(74)90134-x] [Citation(s) in RCA: 130] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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28
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Putrament A, Baranowska H, Prazmo W. Induction by manganese of mitochondrial antibiotic resistance mutations in yeast. MOLECULAR & GENERAL GENETICS : MGG 1973; 126:357-66. [PMID: 4593998 DOI: 10.1007/bf00269445] [Citation(s) in RCA: 108] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Chanet R, Williamson DH, Moustacchi E. Cyclic variations in killing and "petite" mutagenesis induced by ultraviolet light in synchronized yeast strains. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 324:290-9. [PMID: 4586271 DOI: 10.1016/0005-2787(73)90146-9] [Citation(s) in RCA: 44] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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30
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Avner PR, Coen D, Dujon B, Slonimski PP. Mitochondrial genetics. IV. Allelism and mapping studies of oligomycin resistant mutants in S. cerevisiae. MOLECULAR & GENERAL GENETICS : MGG 1973; 125:9-52. [PMID: 4590266 DOI: 10.1007/bf00292982] [Citation(s) in RCA: 140] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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31
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Moustacchi E. Cytoplasmic "petite" induction in recombination-deficient mutants of Saccharomyces cerevisiae. J Bacteriol 1973; 115:805-9. [PMID: 4580568 PMCID: PMC246324 DOI: 10.1128/jb.115.3.805-809.1973] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
As compared to the original wild type, the induction of the cytoplasmic "petite" mutation by ultraviolet light and by the intercalating dye, ethidium bromide, is reduced in two mutants (rec4 and rec5) of Saccharomyces cerevisiae. These mutants are blocked in X rays or ultraviolet light-induced intragenic recombination. It then appears that the products of nuclear genes necessary for the completion of nuclear intragenic recombination events are also involved in steps of the metabolic chain which leads to the mitochondrial mutation, rho(-).
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Neŝvera J. Nuclear and extranuclear mutations in yeast induced by ethyl methanesulfonate. Folia Microbiol (Praha) 1973; 18:353-60. [PMID: 4357088 DOI: 10.1007/bf02875929] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Perlman PS, Mahler HR. Induction of respiration deficient mutants in Saccharomyces cerevisiae by berenil. II. Characteristics of the process. MOLECULAR & GENERAL GENETICS : MGG 1973; 121:295-306. [PMID: 4571803 DOI: 10.1007/bf00433229] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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35
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Hatzfeld J. Correlation between degradation, replication and repair of yeast DNA irradiated by ultraviolet or -rays. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 299:43-53. [PMID: 4573527 DOI: 10.1016/0005-2787(73)90396-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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36
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Mahler HR. Structural requirements for mitochondrial mutagenesis. JOURNAL OF SUPRAMOLECULAR STRUCTURE 1973; 1:449-60. [PMID: 4592817 DOI: 10.1002/jss.400010602] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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37
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Mahler HR, Perlman PS. Mitochondrial membranes and mutagnesis by ethidium bromide. JOURNAL OF SUPRAMOLECULAR STRUCTURE 1972; 1:105-24. [PMID: 4569476 DOI: 10.1002/jss.400010204] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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38
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Marmiroli N, Restivo FM, Donnini C, Bianchi L, Puglisi PP. Analysis of rho mutability in Saccharomyces cerevisiae. I. Effects of mmc and pet-ts alleles. MOLECULAR & GENERAL GENETICS : MGG 1980; 177:581-8. [PMID: 6991865 DOI: 10.1007/bf00272667] [Citation(s) in RCA: 6] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Two additional types of nuclear determinants involved in the control of spontaneous mutability of rho in S. cerevisiae have been identified: mmc and the pet-ts 1, 2, 10, 52 and 53 genes. These genes in their mutated recessive form increase at various extents the number of respiratory deficient cytoplasmic "petite" mutants accumulated. The gene mmc does not affect the respiratory activity and is not temperature-dependent whereas the pet-ts genes determine at the non permissive temperature a respiratory deficient phenotypes even if they affect the mutability of rho at the permissive and at the non permissive temperature. The data here reported suggest that a "replicative complex" exists for the mitochondrial DNA. It is in the purpose of this paper to deal with the relative contribution that mmc and pet-ts gene products have in ensuring the fidelity of this "replicative complex".
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