H3K9me3 ChIP-seq on hematopoietic stem cells sorted from mice 1 month after they were irradiated (2Gy total body irradiation = IR) or not (non irradiated = NIR). H3K9me3 ChIP-seq on hematopoietic stem cells sorted from mice 1 month after they were irradiated (2Gy total body irradiation = IR) or not (non irradiated = NIR)

We aim at understanding how ionizing radiations (IR) increase the risk of developing myeloid leukemia. We recently showed that IR leads to the derepression of retroelements. We demonstrated that retroelements expression in aged HSCs is regulated by the heterochromatin repressive histone mark H3K9me3. However, the mechanisms by which IR specifically triggers retroelements expression in HSCs are unknown. We hypothesized that retroelements derepression is due to IR-induced heterochromatin changes. To answer this question, we performed H3K9me3 ChIP-seq experiments in hematopoietic stem cells sorted from mice one month after they were irradiated and compared them to controls hematopoietic stem cells sorted from non-irradiated mice.