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Tissue-/stage-dependent expression of a cloned Bombyx mandarina QM homologue
1National Sericulture and Entomology Research Institute, Rural Development Administration, Suwon, South Korea.
Abstract:
QM, a novel gene that was firstly isolated as a putative tumor suppressor gene from Wilms' tumor cell line. Although it is well known that the QM gene product plays an important role within the tumor cells, the precise role of QM in the non-tumor cells has remained elusive. With in this mind we isolated a cDNA encoding QM homologue from Bombyx mandarina to understand the function of QM. The 596 bp cDNA has an open reading frame of 219 amino acids and a predicted mol. wt. of 25 kDa. The protein has more than 88% amino acid sequence identity to the QM protein from Drosophila melanogaster. mRNA expression gradually increased from 1-2 days after egg laying to 2 days of finial instar, while very low expressions were detected for either the pupae and the moth stages. The organs, posterior/middle division of silkgland, midgut, fat body and malpighian tubes, also show relatively high mRNA expression levels, respectively. The high degree of conservation and expression of the B. mandarina QM homologous suggest that it has a selectively conserved amino acid sequence due, presumably, to an important biological role which is associated with pupae formation.
Insights
Researchers investigated the QM gene
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The QM gene, initially identified as a tumor suppressor, has a known role in tumor cells.
- Its function in non-tumor cells remains largely uncharacterized.
Purpose of the Study:
- To elucidate the function of the QM gene in non-tumorigenic contexts.
- To investigate the evolutionary conservation and expression patterns of a QM homologue.
Main Methods:
- Isolation and sequencing of a QM homologue cDNA from Bombyx mandarina.
- Analysis of protein sequence identity with known QM proteins.
- Quantitative assessment of mRNA expression during different developmental stages and in various tissues.
Main Results:
- A 596 bp cDNA encoding a 219 amino acid protein (25 kDa) was isolated.
- The Bombyx mandarina QM protein shares over 88% amino acid identity with Drosophila melanogaster QM.
- High mRNA expression was observed during larval development, particularly in the silkgland, midgut, fat body, and malpighian tubes, with lower levels in pupae and moths.
Conclusions:
- The high conservation of the QM homologue suggests a critical biological role.
- Expression patterns indicate a potential involvement in pupae formation and larval development.