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SGDAcn is a suppressor for silk gland endoreplication and development
Lin Wu1, Li Zhao1, Yuting Feng1
1Integrative Science Center of Germplasm Creation in Western China (Chongqing), Science City, Biological Science Research Center, Southwest University, Chongqing, China.
Insect Science
|March 17, 2025
Summary
Silkworm silk gland cells use endoreplication for silk production. Silencing the SGDAcn gene boosts cell size and silk output by enhancing gene expression and protein synthesis.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Silkworm silk gland cells undergo endoreplication, increasing DNA content for silk protein synthesis.
- Cellular polyploidization is crucial for efficient silk production.
Purpose of the Study:
- To investigate the function of a novel gene, SGDAcn, in silkworm silk gland development.
- To explore SGDAcn's role in regulating endoreplication, cell growth, and silk production.
Main Methods:
- CRISPR/Cas9-mediated knockout of the SGDAcn gene in silkworm posterior silk glands.
- Analysis of gene expression, cell size, DNA content, and protein synthesis pathways.
Main Results:
- SGDAcn knockout increased cell size and silk production.
- Gene silencing promoted endoreplication by upregulating cyclin genes and energy metabolism.
- Fibroin gene expression, Dimm transcription, ribosome biogenesis, and translation factors were enhanced.
Conclusions:
- SGDAcn negatively regulates silk gland development, cell size, and protein synthesis.
- SGDAcn affects endoreplication and cell growth via EGFR/PI3K/AKT and NF-κB signaling pathways.
- Targeting SGDAcn offers potential for improving silk yield and understanding cell growth regulation.
