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. 1995 Sep 26;92(20):9259–9263. doi: 10.1073/pnas.92.20.9259

Mouse model of human beta zero thalassemia: targeted deletion of the mouse beta maj- and beta min-globin genes in embryonic stem cells.

D J Ciavatta 1, T M Ryan 1, S C Farmer 1, T M Townes 1
PMCID: PMC40964  PMID: 7568113

Abstract

beta zero-Thalassemia is an inherited disorder characterized by the absence of beta-globin polypeptides derived from the affected allele. The molecular basis for this deficiency is a mutation of the adult beta-globin structural gene or cis regulatory elements that control beta-globin gene expression. A mouse model of this disease would enable the testing of therapeutic regimens designed to correct the defect. Here we report a 16-kb deletion that includes both adult beta-like globin genes, beta maj and beta min, in mouse embryonic stem cells. Heterozygous animals derived from the targeted cells are severely anemic with dramatically reduced hemoglobin levels, abnormal red cell morphology, splenomegaly, and markedly increased reticulocyte counts. Homozygous animals die in utero; however, heterozygous mice are fertile and transmit the deleted allele to progeny. The anemic phenotype is completely rescued in progeny derived from mating beta zero-thalassemic animals with transgenic mice expressing high levels of human hemoglobin A. The beta zero-thalassemic mice can be used to test genetic therapies for beta zero-thalassemia and can be bred with transgenic mice expressing high levels of human hemoglobin HbS to produce an improved mouse model of sickle cell disease.

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