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[Phenocopying action of ether on mn d/SM5-strain Drosophila embryos]
Abstract:
Lower sensitivity of the mn d/SM5 strain flies to methyl ether as against the Canton-S flies is established as regarded to induction of bithorax (bx) phenocopies. It is shown that there are no considerable differences in frequencies of bx-phenocopies, abdomen anomalies and ether-induced embryo death between mn d/mn d and mn d/SM5 individuals. It indicates that these parameters are determined by the genotype of the strain on the whole rather than by mn, d, SM5 mutations. Phenocopies of lethal mutations of the pair-rule, Notch, Abnormal abdomen type are established to arise in embryos of both studied strains. In addition disturbances of two other classes are observed among dead embryos of the mn d/SM5 strain. One of them is probably characteristic of SM5/SM5 individuals, the other is phenocopies of mutations disturbing the segment polarity.
Insights
The mn d/SM5 fly strain shows lower sensitivity to methyl ether than Canton-S flies regarding bithorax phenocopies. Overall strain genotype, not specific mutations, determines phenocopy frequencies and embryo death.
Area of Science:
- Developmental genetics
- Drosophila melanogaster research
- Phenocopy induction
Background:
- Investigating genetic factors influencing developmental pathways in Drosophila.
- Understanding the genetic basis of bithorax (bx) phenocopies and related developmental anomalies.
Purpose of the Study:
- To compare the sensitivity of mn d/SM5 and Canton-S Drosophila strains to methyl ether-induced phenocopies.
- To analyze the genetic control of bithorax phenocopies, abdominal anomalies, and embryo lethality.
Main Methods:
- Exposure of Drosophila melanogaster strains (mn d/SM5, Canton-S) to methyl ether.
- Quantification of bithorax (bx) phenocopies, abdominal anomalies, and embryo death frequencies.
- Genotypic analysis of different mutant combinations (mn d/mn d, mn d/SM5, SM5/SM5).
Main Results:
- The mn d/SM5 strain exhibited lower sensitivity to methyl ether for inducing bithorax phenocopies compared to Canton-S.
- No significant differences in bx-phenocopy frequencies, abdominal anomalies, or embryo death were observed between mn d/mn d and mn d/SM5.
- Phenocopies resembling pair-rule, Notch, and Abnormal abdomen mutations occurred in both strains; additional disturbances, potentially linked to SM5/SM5 or segment polarity mutations, were noted in mn d/SM5 embryos.
Conclusions:
- The overall genotype of the Drosophila strain, rather than specific mn, d, or SM5 mutations, primarily determines the frequency of bx-phenocopies, abdominal anomalies, and ether-induced embryo death.
- The study highlights the complex genetic interactions underlying developmental processes and their susceptibility to environmental factors like methyl ether.