Gene expression networks in the Drosophila Genetic Reference Panel

Area of Science:

• Genomics
• Molecular Biology
• Systems Biology

Background:

• Understanding genotype-phenotype relationships is crucial in biology.
• Genetic variation underlies complex traits, often mediated by molecular phenotypes.
• The Drosophila Genetic Reference Panel offers a powerful system for genetic analysis.

Purpose of the Study:

• To investigate how natural DNA sequence variation affects gene expression and complex traits in Drosophila.
• To identify genetic variants that regulate gene expression, transposable element activity, and microbiome composition.
• To construct regulatory networks that explain the link between genotype and molecular phenotypes.

Main Methods:

• Deep RNA sequencing of 200 Drosophila Genetic Reference Panel inbred lines.
• Mapping expression quantitative trait loci (eQTLs) for genes, novel transcripts, and transposable elements.
• Analysis of host genetic effects on transposable element expression and microbiome composition.
• Construction of sex-specific eQTL regulatory networks.

Main Results:

• Identified eQTLs for annotated genes, novel transcribed regions, transposable elements, and microbial species.
• Discovered host genetic variants influencing transposable element expression independently of copy number.
• Found host genetic control over microbiome composition.
• Constructed sex-specific eQTL networks enriched for regulatory elements and genes controlling transposable elements.

Conclusions:

• Natural genetic variation plays a significant role in regulating gene expression and molecular phenotypes.
• eQTL networks provide insights into the genetic architecture of complex traits.
• This study generates hypotheses for future functional studies on gene regulation and adaptation.