Loss of Dynamin 2 GTPase function results in microcytic anaemia
- Brown, FC; Collett, M; Tremblay, CS; Rank, G; De Camilli, P; Booth, CJ; Bitoun, M; Robinson, PJ; Kile, BT; Jane, SM; Curtis, DJ;
Publication Year 2017, Volume 178, Issue #4, Page 616-628
- Journal Title
- British Journal of Haematology
- Publication Type
- Journal Article
- In a dominant mouse ethylnitrosurea mutagenesis screen for genes regulating erythropoiesis, we identified a pedigree with a novel microcytic hypochromia caused by a V235G missense mutation in Dynamin 2 (Dnm2). Mutations in Dnm2, a GTPase, are highly disease-specific and have been implicated in four forms of human diseases: centronuclear myopathy, Charcot-Marie Tooth neuropathy and, more recently, T-cell leukaemia and Hereditary Spastic Paraplegia, but red cell abnormalities have not been reported to date. The V235G mutation lies within a crucial GTP nucleotide-binding pocket of Dnm2, and resulted in defective GTPase activity and incompatibility with life in the homozygous state. Dnm2 is an essential mediator of clathrin-mediated endocytosis, which is required for the uptake of transferrin (Tf) into red cells for incorporation of haem. Accordingly, we observed significantly reduced Tf uptake by Dnm2+/V235G cells, which led to impaired endosome formation. Despite these deficiencies, surprisingly all iron studies were unchanged, suggesting an unexplained alternative mechanism underlies microcytic anaemia in Dnm2+/V235G mice. This study provides the first in vivo evidence for the requirements of Dnm2 in normal erythropoiesis.
- WEHI Research Division(s)
- Chemical Biology
- PubMed ID
- Publisher's Version
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Creation Date: 2017-05-15 01:16:25Last Modified: 2018-07-05 09:46:17