Project description:We investigated genome folding across the eukaryotic tree of life. We find four general manifestations of genome organization at chromosome-scale that each emerge and disappear repeatedly over the course of evolution. The submission represents chromosome-length Hi-C contact maps, architecture type and homolog separation analyses for 26 species across the tree of life, representing all subphyla of chordates, all 7 extant vertebrate classes, and 7 out of 9 major animal phyla, as well as plants and fungi.
Project description:Sea cucumbers (Holothuroidea; Echinodermata) cycle annually between aestivation, when water temperature is above about 25°C in the summer, and active life, when temperature is below about 18°C. We used RNA-Seq to determine gene expression profiles of respiratory tree tissue of A. japonicus during non-aestivation (NA), deep-aestivation (DA), and arousal from aestivation (AA). At least 15 individuals per stage, respiratory tree at NA, DA and AA stages were used for our experiments.
Project description:All organisms throughout the tree of life sense and respond to their surface environments. To discriminate from among mucosal surface environmental cues, we grew Streptococcus gordonii biofilms over night at 37C on surfaces coated with the salivary mucin MUC5B, or a low density protein fraction derived from human saliva.
Project description:Transcriptome of D. shibae 5 h in the light after 12 days in co-culture with the dinoflagellate P. minimum. Two biological replicates.
Project description:Transcriptome of D. shibae 5 h in the light after 18,24 and 30 days in coculture with the dinoflagellate P. minimum two biological replicates
Project description:In dinoflagellates, the most unique and divergent nuclear organization among the known diversity of eukaryotes has evolved. The list of highly unusual features of dinoflagellate nuclei and genomes is long -- permanently condensed liquid crystalline chromosomes, in which histones are not the main packaging component, genes organized as very long unidirectional gene arrays, general absence of transcriptional regulation, high abundance of the otherwise very rare DNA modification 5-hydroxymethyluracil (5-hmU), and many others. Most of these fascinating properties were originally identified in the 1970s and 1980s but have received very little attention in recent decades using modern genomic tools. In this work, we address some of the outstanding questions regarding dinoflagellate genome organization by mapping the genome-wide distribution of 5-hmU (using both immunoprecipitation-based and basepair-resolution chemical mapping approaches) and of chromatin accessibility in the genome of the dinoflagellate Breviolum minutum. We find that the 5-hmU modification is preferentially enriched over certain classes of repetitive elements, and also often coincides with the boundaries between gene arrays. It is generally anti-correlated with chromatin accessibility, the levels of which are lower in those regions. We discuss the potential roles of 5-hmU in the functional organization of dinoflagellate genomes and its relationship to the transcriptional landscape of gene arrays.
Project description:Sea cucumbers (Holothuroidea; Echinodermata) cycle annually between aestivation, when water temperature is above about 25°C in the summer, and active life, when temperature is below about 18°C. We used RNA-Seq to determine gene expression profiles of respiratory tree tissue of A. japonicus during non-aestivation (NA), deep-aestivation (DA), and arousal from aestivation (AA).
