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Endogenously imprinted genes in Drosophila melanogaster
Molecular Genetics and Genomics : MGG
|March 25, 2014
Summary
Genomic imprinting, where gene expression depends on parental origin, was identified in Drosophila. This study found altered gene expression and extended lifespan in parthenogenetic flies, suggesting endogenous imprinting.
Area of Science:
- Epigenetics
- Developmental Biology
- Genetics
Background:
- Genomic imprinting is an epigenetic phenomenon causing parent-of-origin-specific gene expression.
- While imprinted marker genes are known in Drosophila, endogenous imprinted genes remained unidentified.
Purpose of the Study:
- To investigate the existence of endogenous genomic imprinting in Drosophila.
- To analyze phenotypic and transcriptional differences between parthenogenetic and sexually produced female Drosophila.
Main Methods:
- Phenotypic analysis of parthenogenetic and sexually produced adult female Drosophila.
- Microarray/transcriptional analysis to compare gene expression patterns.
- Analysis of individuals with uniparental inheritance of partial genomes.
Main Results:
- Parthenogenetic Drosophila exhibit extended lifespan compared to sexually produced counterparts.
- 76 genes showed consistently altered expression patterns (36 upregulated, 40 downregulated).
- Evidence suggests indirect imprinting mechanisms involving other imprinted genes or chromatin redistribution.
Conclusions:
- This study provides evidence for endogenous genomic imprinting in Drosophila.
- Parental origin-dependent gene expression is confirmed in this organism.
- Findings contribute to understanding epigenetic regulation and its impact on aging.
