The chemistry of cell division III. Inhibition of cell division of Amoeba proteus by high dilutions of copper salts-antagonism of copper and glutathione

PROTOPLASMA ◽  
1933 ◽  
Vol 19 (1) ◽  
pp. 153-154
Keyword(s):  
Cell Division ◽  
Amoeba Proteus ◽  
Division Iii ◽  
Copper Salts ◽  
High Dilutions

Effects of excess centromeres and excess telomeres on chromosome loss rates

1991 ◽  
Vol 11 (6) ◽  
pp. 2919-2928
Author(s):  
K W Runge ◽  
R J Wellinger ◽  
V A Zakian
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Cell Division ◽  
Dna Sequences ◽  
Fluctuation Analysis ◽  
Chromosome Stability ◽  
Chromosome Loss ◽  
Division Iii ◽  
Daughter Cells ◽  
Chromosome Iii ◽  
Linear Chromosomes

The linear chromosomes of eukaryotes contain specialized structures to ensure their faithful replication and segregation to daughter cells. Two of these structures, centromeres and telomeres, are limited, respectively, to one and two copies per chromosome. It is possible that the proteins that interact with centromere and telomere DNA sequences are present in limiting amounts and could be competed away from the chromosomal copies of these elements by additional copies introduced on plasmids. We have introduced excess centromeres and telomeres into Saccharomyces cerevisiae and quantitated their effects on the rates of loss of chromosome III and chromosome VII by fluctuation analysis. We show that (i) 600 new telomeres have no effect on chromosome loss; (ii) an average of 25 extra centromere DNA sequences increase the rate of chromosome III loss from 0.4 x 10(-4) events per cell division to 1.3 x 10(-3) events per cell division; (iii) centromere DNA (CEN) sequences on circular vectors destabilize chromosomes more effectively than do CEN sequences on 15-kb linear vectors, and transcribed CEN sequences have no effect on chromosome stability. We discuss the different effects of extra centromere and telomere DNA sequences on chromosome stability in terms of how the cell recognizes these two chromosomal structures.

scholarly journals Effects of excess centromeres and excess telomeres on chromosome loss rates.

1991 ◽  
Vol 11 (6) ◽  
pp. 2919-2928 ◽  
Author(s):  
K W Runge ◽  
R J Wellinger ◽  
V A Zakian
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Cell Division ◽  
Dna Sequences ◽  
Fluctuation Analysis ◽  
Chromosome Stability ◽  
Chromosome Loss ◽  
Division Iii ◽  
Daughter Cells ◽  
Chromosome Iii ◽  
Linear Chromosomes

The linear chromosomes of eukaryotes contain specialized structures to ensure their faithful replication and segregation to daughter cells. Two of these structures, centromeres and telomeres, are limited, respectively, to one and two copies per chromosome. It is possible that the proteins that interact with centromere and telomere DNA sequences are present in limiting amounts and could be competed away from the chromosomal copies of these elements by additional copies introduced on plasmids. We have introduced excess centromeres and telomeres into Saccharomyces cerevisiae and quantitated their effects on the rates of loss of chromosome III and chromosome VII by fluctuation analysis. We show that (i) 600 new telomeres have no effect on chromosome loss; (ii) an average of 25 extra centromere DNA sequences increase the rate of chromosome III loss from 0.4 x 10(-4) events per cell division to 1.3 x 10(-3) events per cell division; (iii) centromere DNA (CEN) sequences on circular vectors destabilize chromosomes more effectively than do CEN sequences on 15-kb linear vectors, and transcribed CEN sequences have no effect on chromosome stability. We discuss the different effects of extra centromere and telomere DNA sequences on chromosome stability in terms of how the cell recognizes these two chromosomal structures.

Studies on Cell Growth and Cell Division III

1964 ◽  
Vol 53 (3) ◽  
pp. 290-293 ◽  
Author(s):  
Kwan-Hua Lee ◽  
Yoko Yuzuriha
Keyword(s):  
Cell Division ◽  
Cell Growth ◽  
Division Iii
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