| First Author | Keller P | Year | 1999 |
| Journal | Proc Natl Acad Sci U S A | Volume | 96 |
| Issue | 13 | Pages | 7479-83 |
| PubMed ID | 10377440 | Mgi Jnum | J:56055 |
| Mgi Id | MGI:1339921 | Doi | 10.1073/pnas.96.13.7479 |
| Citation | Keller P, et al. (1999) X inactivation and somatic cell selection rescue female mice carrying a Piga-null mutation. Proc Natl Acad Sci U S A 96(13):7479-83 |
| abstractText | A somatic mutation in the X linked PIGA gene is responsible for the deficiency of glycosyl phosphatidylinositol (GPI)-anchored proteins on blood cells from patients with paroxysmal nocturnal hemoglobinuria. No inherited form of GPI-anchor deficiency has been described. Because conventional Piga gene knockout is associated with high embryonic lethality in chimeric mice, we used the Cre/loxP system. We generated mice in which two loxP sites flank part of Piga exon 2. After crossbreeding with female mice of the EIIa-cre strain, the floxed allele undergoes Cre-mediated recombination with high efficiency during early embryonic development. Because of X chromosome inactivation, female offspring are mosaic for cells that express or lack GPI-linked proteins. Analysis of mosaic mice showed that in heart, lung, kidney, brain, and liver, mainly wild-type Piga is active, suggesting that these tissues require GPI-linked proteins. The salient exceptions were spleen, thymus, and red blood cells, which had almost equal numbers of cells expressing the wild-type or the recombined allele, implying that GPI-linked proteins are not essential for the derivation of these tissues. PIGA(-) cells had no growth advantage, suggesting that other factors are needed for their clonal dominance in patients with paroxysmal nocturnal hemoglobinuria. |
