Histone selleck chem modifications have been implicated in stem cell servicing and differentiation. We've analyzed genome-wide HSP90 improvements in gene expression and histone modifications in the course of differentiation of multipotent human primary hematopoietic stem cells/progenitor cells (HSCs/HPCs) into erythrocyte precursors. Our data indicate that H3K4me1, H3K9me1, and H3K27me1 associate with enhancers of differentiation genes just before their activation and correlate with basal expression, suggesting that these monomethylations are involved in the maintenance of activation probable required for differentiation. Furthermore, although the majority of genes linked with each H3K4me3 and H3K27me3 in HSCs/HPCs become silent and drop H3K4me3 immediately after differentiation, those who get rid of H3K27me3 and come to be activated immediately after differentiation are linked with elevated levels of H2A.Z, H3K4me1, H3K9me1, H4K20me1, and RNA polymerase eleven in HSCs/HPCs. So, our data suggest that gene expression alterations during differentiation are programmed by chromatin modifications current on the HSC/HPC stage and give a resource for enhancer and promoter identification.