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Updated: Jul 14, 2026
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Whole Body and Regional Quantification of Active Human Brown Adipose Tissue Using 18F-FDG PET/CT
Published on: April 1, 2019
Summary
Homeotic mutations in Drosophila's bithorax complex cause significant segmental transformations. Mapping over 40 mutations reveals clustered lesions aligned with affected body segments, indicating complex genetic organization.
Area of Science:
- Developmental genetics
- Molecular biology
- Drosophila melanogaster research
Background:
- Homeotic mutations in the bithorax complex of Drosophila induce segmental transformations.
- Understanding the genetic architecture of the bithorax complex is crucial for developmental biology.
Purpose of the Study:
- To map the precise locations of over 40 mutations within the right half of the bithorax complex.
- To correlate mutation locations with observed phenotypic effects on segmental identity.
Main Methods:
- A chromosomal walk was performed to extend DNA mapping within the bithorax complex.
- Lesions for numerous mutations were localized onto the generated DNA map.
- Complementation tests were utilized to assess genetic interactions.
Main Results:
- The chromosomal walk covered 215 kb within the right half of the bithorax complex.
- Mutations were grouped into phenotypic classes corresponding to abdominal segments.
- Mutant lesions were found to be clustered and arranged linearly according to the body segments they affect.
- Complementation tests revealed interactions between distant DNA regions within the complex.
Conclusions:
- The right half of the bithorax complex exhibits a complex organization where mutations affect multiple segments.
- The linear arrangement of clustered lesions suggests a gene order corresponding to segmental identity.
- The bithorax complex functions as an integrated unit, as no region can be deleted without functional loss.
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