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Influence of RNAi knockdown for E-complex genes on the silkworm proleg development
1Shanghai Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, The Chinese Academy of Sciences, Shanghai 200032, People's Republic of China.
Archives of Insect Biochemistry and Physiology
|December 3, 2010
Summary
Hox genes Ubx and Abd-B repress proleg development in silkworm (Bombyx mori) larvae, similar to fruit flies. However, abd-A plays a distinct role in directing proleg formation.
Area of Science:
- Developmental Biology
- Genetics
- Entomology
Background:
- Holometabolous insects, like Lepidoptera, possess abdominal prolegs crucial for locomotion.
- The precise function of Hox genes in Lepidoptera proleg development remains debated.
Purpose of the Study:
- To investigate the roles of E-complex Hox genes (Ubx, abd-A, Abd-B) in Bombyx mori proleg development.
- To elucidate the evolutionary modifications of Hox gene functions in insect appendage formation.
Main Methods:
- Utilized double-stranded RNA (dsRNA)-mediated interference (RNAi) to knock down specific Hox genes.
- Analyzed the effects of RNAi on ventral appendage development in Bombyx mori larvae.
Main Results:
- Ubx RNAi induced leg identity on the A1 segment.
- abd-A RNAi resulted in severe defects in abdominal prolegs.
- Abd-B RNAi led to proleg identity in more posterior abdominal segments.
Conclusions:
- Lepidoptera Hox genes Ubx and Abd-B exhibit conserved repressing functions on ventral appendage development, mirroring Drosophila.
- The abd-A gene in Lepidoptera appears to have evolved distinct functions, playing a key role in proleg development.
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