Project description:We have combined standard micrococcal (MNase) digestion of nuclei with a modified protocol for construction paired-end DNA sequencing libraries to map both nucleosomes and subnucleosome-sized particles at single base-pair resolution throughout the budding yeast genome. We found that partially unwrapped nucleosomes and subnucleosome-sized particles can occupy the same position within a cell population, suggesting dynamic behavior. By varying the time of MNase digestion, we have been able to observe changes that reflect differential sensitivity of particles, including eviction of nucleosomes. Our protocol and mapping method provide a general strategy for characterizing full epigenomes. We used micrococcal nuclease mapping, chromatin immunoprecipitation and paired-end sequencing to determine the structure of yeast centromeres at single base-pair resolution.
Project description:The intrinsic complexity of quantitative traits was evident even before the molecular nature of the gene was understood. Yet we still lack a detailed molecular understanding of complex heritability. Here we alleviated statistical roadblocks to high-resolution genetic mapping by using an inbred population of diploid yeast with very low linkage disequilibrium and more individuals than segregating polymorphisms. We mapped over 18,000 quantitative trait loci, resolving more than 3,300 to single nucleotides. This allowed us to explore the molecular origins of complexity, hybrid vigor, pleiotropy, and gene ´ environment interactions and to rigorously estimate the distribution of fitness effects of natural genetic variation. Our results describe a comprehensive, high-resolution genotype-to-phenotype map and define general principles underlying the complexity of heredity.
2018-12-13 | GSE123702 | GEO
Project description:Construction of genetic map of Chinese Cherry