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Production of X0 clones in XX females of Drosophila

Published online by Cambridge University Press:  14 April 2009

Daniel Bachiller  and
Lucas Sánchez
Daniel Bachiller
Affiliation:
Centro de Investigaciones Biológicas, Velázquez 144, 28006 Madrid/Spain
Lucas Sánchez*
Affiliation:
Centro de Investigaciones Biológicas, Velázquez 144, 28006 Madrid/Spain
*
2 Corresponding author.
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The experiments reported here are aimed at determining whether mutations deleting the function of the Sex-lethal (Sxl) gene are able to suppress the lethality of X0 clones, induced in females after the time when the state of activity of Sxl is irreversibly fixed by the ratio of the number of X chromosomes to sets of autosomes (X: A). This analysis was carried out by comparing the frequency of induced male clones (X0 constitution) in SxlfLS/ + and Sxl+/Sxl+ females, following irradiation at blastoderm and larval stages. The genotype used in these experiments, however, could also give rise to 2X; 2A cells homozygous for SxlfLS, and such cells would also differentiate male structures. To minimize this possibility, we have constructed a genotype made up of a ring and a rod X chromosome. In such ring-rod females the production of 2X; 2A clones homozygous for SxlfLS is a rather rare event, if possible at all. X0 male clones were produced in both types of females following irradiation at blastoderm stage, while X0 male clones were only observed in SxlfLS/ + females when irradiation took place at larval stage. In this latter case, the only X0 male clones were those that contained the SxlfLS mutation. These results support the idea of Sánchez & Nöthiger (1983) that the X: A signal irreversibly sets the state of activity of Sxl at blastoderm stage, and in addition show that X0 clones generated after that time are viable if they contain a Sxl− mutation. These results are compatible with the idea of Sxl being the only gene that responds to the X:A signal.

Type
Research Article
Information
Genetics Research , Volume 57 , Issue 1 , February 1991 , pp. 23 - 28
Copyright
Copyright © Cambridge University Press 1991

References

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