Project description:Restriction site Associated DNA (RAD) tags are a genome-wide representation of every site of a particular restriction enzyme by short DNA tags. Most organisms segregate large numbers of DNA sequence polymorphisms that disrupt restriction sites, which allow RAD tags to serve as genetic markers spread at a high-density throughout the genome. Here, we demonstrate the applicability of RAD markers for both individual and bulk-segregant genotyping. First, we show that these markers can be identified and typed on pre-existing microarray formats. Second, we present a method that uses RAD marker DNA to rapidly produce a low-cost microarray genotyping resource that can be used to efficiently identify and type thousands of RAD markers. We demonstrate the utility of the former approach by using a tiling path array for the fruit fly to map a recombination breakpoint, and the latter approach by creating and utilizing an enriched RAD marker array for the threespine stickleback. The high number of RAD markers enabled localization of a previously identified region, as well as a second novel region also associated with the lateral plate phenotype. Taken together, our results demonstrate that RAD markers, and the method to develop a RAD marker microarray resource, allow high-throughput, high-resolution genotyping in both model and non-model systems. Keywords: microarray genotyping
2007-01-24 | GSE5773 | GEO
Project description:Identification of sex-associated RAD-tags from Characidium gomesi
Project description:One of the most recognizable physiological phenomena is the adrenergic-induced fight-or-flight increase in heart rate and cardiac contraction. For the β-adenergic agonist-induced enhancement of calcium influx and transients, and contractility in the heart, we identify the dual requirement of a subpopulation of Rad-bound calcium channels under basal conditions and PKA phosphorylation of Rad. In mice expressing a non-phosphorylatable Rad mutant, basal cardiac contractility is reduced and adrenergic-augmentation of the calcium current and contractility are disabled. Expression of mutant calcium channel β-subunits that cannot bind the mutant Rad restored contractility, revealing a highly specific therapeutic approach to mimic the contractility imparted by adrenergic agonists. Our findings place Rad and its modulation of calcium channels at the nexus of adrenergic modulation of cardiac responses.
Project description:HEK293T cells were transfected with the plasmid construct expressing FLAG-GST-tagged SUGP1 (aa 543-645), followed by two rounds of affinity purification using FLAG and GST tags. The purified proteins were resolved by SDS-PAGE, followed by staining with QC Colloidal Coomassie Stain (Bio-Rad). The relevant gel region (~85-100 KD) was excised, and the proteins in this gel section were identified by mass spectrometry.
Project description:Fight-or-flight responses involve β-adrenergic-induced increases in heart rate and contractile force. Despite decades of investigations, predominantly focusing on ryanodine receptor and phospholamban phosphorylation, the molecular mechanisms underlying the sympathetic nervous system control of cardiac contractility remain controversial and incompletely elucidated. Here, we identify the calcium-channel inhibitor Rad as a critical component. In cardiomyocytes isolated from knock-in mice expressing Rad with alanine-substitutions of the four PKA-phosphorylated serine residues (4SA-Rad), calcium currents cannot be increased by adrenergic agonists or phosphatase inhibitor. In these mice, basal cardiac contractility, exercise capacity and heart rate are reduced, and the augmentation of contractile force by adrenergic agonists is severely blunted. Expression of mutant calcium-channel β-subunits that cannot bind Rad is sufficient to restore calcium influx and cardiac contractility in 4SA-Rad mice to levels induced by adrenergic agonists in wild-type mice, revealing a potential therapeutic approach to enhance cardiac contractility while bypassing stimulation of adrenergic receptors.
Project description:Seif, 2019 - Systems biology and pangenome of Salmonella O-antigens
Strain-specific metabolic models of Salmonella strains updated with O-antigen metabolic pathways.
Locus-tags are updated in this version of the models to include both the prokka annotations and the refseq locus tags.