Genetic Control of Mitosis: Features of Anaphase Separation of Sister Chromatid Sets in Mutant Strain aar V158 in Drosophila melanogaster

Genetic Control of Mitosis: Features of Anaphase Separation of Sister Chromatid Sets in Mutant... The effect of mutation aar V158 on anaphase separation of chromatids was studied on fixed cells of neural ganglia of Drosophila melanogaster larvae. It was shown that mutation aar V158 causes three types of defective chromosome segregation manifested as (1) monopolar anaphase, (2) separation of chromatids to an abnormally short distance in anaphase, and (3) bridging and lagging of some chromatids or prolonged asynchronous separation of sister chromatid sets to the poles in anaphase. We believe that the former two types of defective segregation are caused by disturbed centrosome separation at the beginning of mitosis and the third type, by defects in chromatid separation during anaphase. During the two-year maintenance of the mutation in a heterozygous state, partial correction (adaptive modification) of the defects of type 1 and type 2 (but not type 3) occurred. The correction of type 1 and type 2 defects during adaptogenesis depended on the genotype: in heterozygotes and homozygotes, respectively type 1 and type 2 were preferentially corrected. The frequency of type 3 defects remained constant during the two-year period of maintenance of the mutation in a heterozygous state. However, in all variants of the experiment, their frequency decreased with increasing distance between the sister chromatid sets. In the cells that completed the previous division with abnormalities, the checkpoint system is supposed to effectively arrest the cell cycle in the subsequent division. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Genetics Springer Journals

Genetic Control of Mitosis: Features of Anaphase Separation of Sister Chromatid Sets in Mutant Strain aar V158 in Drosophila melanogaster

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Biomedicine; Human Genetics
ISSN
1022-7954
eISSN
1608-3369
D.O.I.
10.1023/A:1025723117521
Publisher site
See Article on Publisher Site

Abstract

The effect of mutation aar V158 on anaphase separation of chromatids was studied on fixed cells of neural ganglia of Drosophila melanogaster larvae. It was shown that mutation aar V158 causes three types of defective chromosome segregation manifested as (1) monopolar anaphase, (2) separation of chromatids to an abnormally short distance in anaphase, and (3) bridging and lagging of some chromatids or prolonged asynchronous separation of sister chromatid sets to the poles in anaphase. We believe that the former two types of defective segregation are caused by disturbed centrosome separation at the beginning of mitosis and the third type, by defects in chromatid separation during anaphase. During the two-year maintenance of the mutation in a heterozygous state, partial correction (adaptive modification) of the defects of type 1 and type 2 (but not type 3) occurred. The correction of type 1 and type 2 defects during adaptogenesis depended on the genotype: in heterozygotes and homozygotes, respectively type 1 and type 2 were preferentially corrected. The frequency of type 3 defects remained constant during the two-year period of maintenance of the mutation in a heterozygous state. However, in all variants of the experiment, their frequency decreased with increasing distance between the sister chromatid sets. In the cells that completed the previous division with abnormalities, the checkpoint system is supposed to effectively arrest the cell cycle in the subsequent division.

Journal

Russian Journal of GeneticsSpringer Journals

Published: Oct 7, 2004

References

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