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Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
Published on: August 21, 2014
MicroRNAs Circulate in the Hemolymph of Drosophila and Accumulate Relative to Tissue microRNAs in an Age-Dependent
Joseph M Dhahbi1, Hani Atamna2, Rui Li3
1Department of Medical Education, California Northstate University College of Medicine, Elk Grove, CA, USA.; Department of Biochemistry, University of California at Riverside, Riverside, CA, USA.
Abstract:
In mammals, extracellular miRNAs circulate in biofluids as stable entities that are secreted by normal and diseased tissues, and can enter cells and regulate gene expression. Drosophila melanogaster is a proven system for the study of human diseases. They have an open circulatory system in which hemolymph (HL) circulates in direct contact with all internal organs, in a manner analogous to vertebrate blood plasma. Here, we show using deep sequencing that Drosophila HL contains RNase-resistant circulating miRNAs (HL-miRNAs). Limited subsets of body tissue miRNAs (BT-miRNAs) accumulated in HL, suggesting that they may be specifically released from cells or particularly stable in HL. Alternatively, they might arise from specific cells, such as hemocytes, that are in intimate contact with HL. Young and old flies accumulated unique populations of HL-miRNAs, suggesting that their accumulation is responsive to the physiological status of the fly. These HL-miRNAs in flies may function similar to the miRNAs circulating in mammalian biofluids. The discovery of these HL-miRNAs will provide a new venue for health and disease-related research in Drosophila.
Insights
Drosophila hemolymph contains circulating microRNAs (miRNAs) that are stable and responsive to physiological status. This discovery opens new avenues for studying health and disease in fruit flies using these hemolymph-derived miRNAs.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Extracellular microRNAs (miRNAs) circulate in mammalian biofluids, acting as intercellular regulators.
- Drosophila melanogaster serves as a model organism for human disease research due to its analogous circulatory system.
Purpose of the Study:
- To investigate the presence and characteristics of circulating miRNAs in Drosophila hemolymph (HL).
- To explore the potential of HL-miRNAs as biomarkers for physiological status in flies.
Main Methods:
- Deep sequencing of Drosophila hemolymph (HL) to identify microRNAs (miRNAs).
- Analysis of miRNA populations in HL from flies of different ages.
Main Results:
- Drosophila HL contains abundant RNase-resistant circulating miRNAs (HL-miRNAs).
- Specific subsets of body tissue miRNAs (BT-miRNAs) were found in HL, suggesting selective release or stability.
- Unique HL-miRNA profiles were observed in young and old flies, indicating responsiveness to physiological state.
Conclusions:
- Drosophila HL-miRNAs are stable and potentially function analogously to mammalian circulating miRNAs.
- The discovery of HL-miRNAs provides a novel research avenue for Drosophila health and disease studies.
