Project description:The goal was to study the effects of lead exposure on gene expression and identify the lead-responsive genes. After detecting 1,536 cis-eQTLs (FDR ⤠10%) and 952 trans-eQTLs, we focused our analysis on Pb-sensitive âtrans-eQTL hotspotsâ. 158 randomly selected Drosophila Synthetic Population Resource (A2) samples (control 79 samples and Pb-treated) without replicates
Project description:The goal was to study the effects of lead exposure on gene expression and identify the lead-responsive genes. After detecting 1,536 cis-eQTLs (FDR ≤ 10%) and 952 trans-eQTLs, we focused our analysis on Pb-sensitive “trans-eQTL hotspots”.
Project description:Species-specific regulation of gene expression contributes to the development and maintenance of reproductive isolation and to species differences in ecologically important traits. A better understanding of the evolutionary forces which shape regulatory variation and divergence can be developed by comparing expression differences among species and interspecific hybrids. Once expression differences are identified, the underlying genetics of regulatory variation or divergence can be explored. With the goal of associating cis and/or trans components of regulatory divergence with differences in gene expression, overall and allele-specific expression levels were assayed genome-wide in female adult heads of D. melanogaster, D. simulans and their F1 hybrids. A greater proportion of cis differences than trans differences were identified for genes expressed in heads and, in accordance with previous studies, cis differences also explained a larger number of species differences in overall expression level. Regulatory divergence was found to be prevalent among genes associated with defense, olfaction, and among genes downstream of the Drosophila sex determination hierarchy. In addition, two genes, with critical roles in sex determination and micro RNA processing, Sxl and loqs, were identified as misexpressed in hybrid female heads, potentially contributing to hybrid incompatibility.
Project description:We applied microfluidic multiplex PCR and deep sequencing (mmPCR-seq) to quantify RNA editing levels at targeted sites in Drosophila melanogaster, Drosophila sechellia and the species-specific alleles of their F1 hybrids to understand the contribution of cis and trans regulatory factors to regulating RNA editing levels.
Project description:Here we describe a bottom-up approach to analyse an enriched membrane fraction from Drosophila melanogaster heads using multidimensional liquid chromatography (LC) coupled with tandem-mass spectrometry (MS/MS) that relies on a complete solubilisation and digestion of proteins. An enriched membrane fraction was prepared using equilibrium density centrifugation on a discontinual sucrose gradient, followed by solubilisation using FASP method, tryptic and consequential chymotryptic digestion of proteins. Peptides were separated by reversed-phase (RP) LC at high pH in the first dimension and acidic RP-LC coupled directly to Orbitrap Velos Pro mass spectrometer.
Project description:Expression data for aging female drosophila melanogaster Female drosophila heads were collected RNA extraction and hybridization on Affymetrix microarrays.
