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Cell state transitions during embryonic development are associated with epigenetic changes that alter chromatin structure and gene expression. Interplay between epigenetic regulatory layers can be studied using genomic technologies and embryonic stem cell cultures that reflectin vivocell states.
Ancient genomes can inform our understanding of the history of human adaptation through the direct tracking of changes in genetic variant frequency across different geographical locations and time periods. The authors review recent ancient DNA analyses of human, archaic hominin, pathogen, and domesticated animal and plant genomes, as well as the insights gained regarding past human evolution and behaviour.
The differentiation of an organism into a male or female phenotype is a critical developmental process, but the mechanisms that control this decision are remarkably evolutionarily labile. This Review discusses the wide diversity of vertebrate sex-determination mechanisms, their rapid evolution under different forms of genetic and environmental control and the over-arching principles that are shared despite this mechanistic diversity.
Recent microbiome genome-wide association studies have identified numerous associations between human genetic variants and the gut microbiome. Here, the authors review how genetic variation in the host can alter the composition of the gut microbiome towards a disease state, with a focus on disorders of immunity and metabolism.