A TEMPERATURE SENSITIVE CELL DIVISION MUTANT IN &lt;i&gt;PARAMECIUM CAUDATUM&lt;/i&gt;

Myohara, Koji; Hiwatashi, Koichi

doi:10.1266/jjg.50.273

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“…caudatum. Mating-type instability occurs only in mating-type VI clones and never in mating-type V clones (MYOHARA and HIWATASHI 1975). To selection against the cells from the mating-type VI parent, we made use of the erythromycin sensitivity of wild type and erythromycin resistance in a mutant showing cytoplasmic inheritance.…”

Section: Descendants Of a Cross Between D-kk 7a And D-kk 14amentioning

confidence: 99%

“…In Paramecium caudatum, temporal regulation of gene expression has been observed in two traits; mating reactivity and mating-type instability. Mating reactivity appears about 50 fissions after conjugation ( MIWA and HIWATASHI 1970;TAKAGI 1970), and mating-type instability begins about 100 fissions after conjugation (MYOHARA and HIWATASHI 1975). The appearance of mating reac-tivity is known to be determined by the number of fissions, not by absolute time (MIWA and HIWATASHI 1970).…”

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confidence: 99%

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MUTANTS OF SEXUAL MATURITY IN PARAMECIUM CAUDATUM SELECTED BY ERYTHROMYCIN RESISTANCE

Myohara

Hiwatashi

1978

Genetics

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Cells of Paramecium caudatum, syngen 3 usually become sexually mature about 50 fissions after conjugation. In order to study the genetic mechanisms that control fission-dependent expression of maturity, an attempt was made to obtain early mature mutants by treatment with N-methyl-N′-nitro-N-nitro-soguanidine. A new cytoplasmic marker, erythromycin resistance, was used to eliminate nonconjugant and macronuclear regeneration clones. Twenty early mature clones were obtained from five different mutagenized cultures. Three of them were genetically analyzed by crosses to wild-type stocks. The results show all three mutants to be controlled by incompletely dominant genes, i.e., the homozygotes became mature 20-25 fissions and the heterozygotes 15 fissions earlier than the wild-type clones. At least two different loci are suggested for the early maturity.

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Section: Descendants Of a Cross Between D-kk 7a And D-kk 14amentioning

confidence: 99%

mentioning

confidence: 99%