Document Detail


Variability of autogamy-maturation pattern in genetically identical populations of Paramecium tetraurelia.
MedLine Citation:
PMID:  12499668     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Autogamy in Paramecium tetraurelia is a form of sexual reproduction in a single cell that results in homozygosity in every genetic locus. Autogamy becomes inducible by natural starvation several fissions after the previous autogamy, and percent autogamy increases gradually with clonal age to reach 100%. We here report the degree of variability of the autogamy-maturation pattern, and how it is inherited through autogamous generations. We assessed the autogamy-maturation pattern by monitoring percent autogamy at the ages of 9, 18 and 27 fissions in the wild-type stock 51. To determine how the autogamy-maturation pattern is inherited, clones that showed the lowest and the highest percent autogamy at age 18 in a given autogamous generation (Gn) were examined for their percent autogamy in the next autogamous generation (Gn+1). This procedure was repeated through successive autogamous generations. We found that percent autogamy at ages 9 and 27 was rather stable (low and high, respectively), while it was extremely variable at age 18 ranging from 3% to 100%. We also found that percent autogamy at age 18 in the progeny clones was variable irrespective of percent autogamy at age 18 in the parental clones; there was no regular rule such as producing progeny with higher (or lower) percent autogamy from parents with lower (or higher) percent autogamy.
Authors:
Rie Komori; Terue Harumoto; Hiromi Fujisawa; Yoshiomi Takagi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Zoological science     Volume:  19     ISSN:  0289-0003     ISO Abbreviation:  Zool. Sci.     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-12-24     Completed Date:  2003-04-23     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8702287     Medline TA:  Zoolog Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1245-9     Citation Subset:  IM    
Affiliation:
The Division of Human Environmental Sciences, Graduate School of Human Culture, Nara Women's University, Nara, Japan.
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MeSH Terms
Descriptor/Qualifier:
Animals
Genetic Variation
Homozygote
Paramecium / genetics*,  growth & development,  physiology*
Reproduction*
Sexual Maturation
Time Factors

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