However, the role that epistasis plays in the genetic architecture of quantitative traits is controversial. Here, we compared the genetic architecture of three Drosophila
life history traits in the sequenced inbred lines of the Drosophila melanogaster Genetic Reference Panel (DGRP) and a large outbred, advanced intercross population derived from 40 DGRP lines (Flyland). We assessed allele frequency changes between pools of individuals at the extremes of the distribution for each trait in the Flyland population by deep DNA sequencing. The genetic architecture of all traits was highly polygenic GW4869 Apoptosis inhibitor in both analyses. Surprisingly, none of the SNPs associated with the traits in Flyland replicated in the DGRP and vice versa. However, the majority
of these SNPs participated in at least one epistatic interaction in the DGRP. Despite apparent additive effects at largely distinct loci in the two populations, the epistatic interactions perturbed common, biologically plausible, and highly connected genetic networks. Our analysis underscores the importance of epistasis as a principal factor that determines variation for quantitative traits and provides a means to uncover genetic networks affecting these traits. Knowledge of epistatic networks will contribute to our understanding of the genetic basis of evolutionarily and clinically important traits and enhance predictive ability at an individualized level in medicine and agriculture.”
“In the title compound, C(19)H(16)Cl(4)O(4), the two halves of the molecule are related by a crystallographic twofold rotation axis passing through the central spiro-C selleckchem atom. The two non-planar six-membered heterocycles both adopt chair conformations, and the dihedral angle between the two benzene rings is 76.6 (1)degrees. In the crystal structure, intermolecular C-H center dot center dot center dot O hydrogen bonds link the molecules into chains along the c axis.”
“A two-stage process, composed of growth under nutrient-rich
conditions followed by cultivation under nitrogen starvation and controlled conditions of phosphate, light intensity, aeration, and carbon sources was applied for lipid production selleck products by the green alga Chlorella vulgar’s. Using conditions without addition of nitrogen, 2 mg/L PO4-P, light intensity of 100 mu mol/m(2)/s and 0.25 vvm of air, about 43% of dry cell weight accumulated as lipids after 12 h, which equates to a lipid productivity of 77.8 mg/L/d. In a medium containing 5 mg/L NO3-N and 2 mg/L PO4-P, and at a light intensity of 100 mu mol/m(2)/s and 0.25 vvm of 2% CO2, about 53% of dry cell weight consisted of lipids after 24 h, representing a lipid productivity of 77.1 mg/L/d. The low amount of nutrients, moderate aeration and light intensity were helpful for increasing lipid productivity. (C) 2012 Elsevier Ltd. All rights reserved.