Preclinical Research in Down Syndrome: From Bench to Bedside, Volume 251, the latest release in the Progress in Brain Research series, highlights new advances in the field. Chapters in this updated release include Exploring genetic and epigenetic mechanisms underlying cognitive deficits in Down syndrome, The trisomy paradox: gene expression dysregulation domains, the Influence of allelic differences in mouse models of Down syndrome, Modelling Down syndrome in cells: From stem cells to organoids, Modelling Down syndrome in animals from the early stage to the new generation of models, Mapping behavioral landscapes in Down syndrome animal models, and more.