| First Author | Geng X | Year | 2022 |
| Journal | Adv Sci (Weinh) | Volume | 9 |
| Issue | 7 | Pages | e2103837 |
| PubMed ID | 35037428 | Mgi Jnum | J:339248 |
| Mgi Id | MGI:7520705 | Doi | 10.1002/advs.202103837 |
| Citation | Geng X, et al. (2022) PICH Supports Embryonic Hematopoiesis by Suppressing a cGAS-STING-Mediated Interferon Response. Adv Sci (Weinh) 9(7):e2103837 |
| abstractText | The Plk1-interacting checkpoint helicase (PICH) protein localizes to ultrafine anaphase DNA bridges in mitosis along with a complex of DNA repair proteins. Previous studies show PICH deficiency-induced embryonic lethality in mice. However, the function of PICH that is required to suppress embryonic lethality in PICH-deficient mammals remains to be determined. Previous clinical studies suggest a link between PICH deficiency and the onset of acquired aplastic anemia. Here, using Pich knock-out (KO) mouse models, the authors provide evidence for a mechanistic link between PICH deficiency and defective hematopoiesis. Fetal livers from Pich-KO embryos exhibit a significantly elevated number of hematopoietic stem cells (HSCs); however, these HSCs display a higher level of apoptosis and a much-reduced ability to reconstitute a functional hematopoietic system when transplanted into lethally irradiated recipients. Moreover, these HSCs show an elevated cytoplasmic dsDNA expression and an activation of the cGAS-STING pathway, resulting in excessive production of type I interferons (IFN). Importantly, deletion of Ifnar1 or cGAS reverses the defective hematopoiesis. The authors conclude that loss of PICH results in defective hematopoiesis via cGAS-STING-mediated type I IFN production. |
