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Phenocopies ofBithorax mutants : Genetic and developmental analyses
M P Capdevila1, A García-Bellido1
1Centro de Biologia Molecular CSIC, Facultad de Ciencias, UAM, Madrid-34, Spain.
Wilhelm Roux'S Archives of Developmental Biology
|March 18, 2017
Summary
Exposure to ether induces bithorax phenocopies in Drosophila melanogaster embryos, demonstrating cell heredity. Genetic mutations affect phenocopy frequency, suggesting a model involving positional information and gene regulation.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- The bithorax system in Drosophila melanogaster controls segment identity.
- Understanding the genetic and molecular mechanisms underlying segment specification is crucial for developmental biology.
Purpose of the Study:
- To investigate the induction of bithorax phenocopies by ether exposure in Drosophila melanogaster embryos.
- To analyze the role of cell heredity in maintaining these phenocopies.
- To explore the genetic basis of phenocopy induction and frequency.
Main Methods:
- Exposure of wild-type and mutant Drosophila melanogaster embryos to ether.
- Clonal analysis of phenocopy spots to assess cell heredity.
- Comparative analysis of phenocopy frequencies in embryos with different genetic backgrounds (heterozygous vs. homozygous) and copy numbers of the bithorax system.
Main Results:
- Ether exposure induces phenocopies of bithorax alleles in Drosophila embryos.
- Phenocopies are maintained by cell heredity.
- Frequency of phenocopies varies with specific mutations (point vs. breakpoint) and copy number of the bithorax system.
Conclusions:
- A model is proposed where ether-induced phenocopies result from disrupted positional information signaling.
- This disruption involves competition between inductor molecules and the bithorax system's regulator gene and cis-regulatory region.
- Derepression of the bithorax system initiates a metathoracic developmental pathway.
