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Blood, Vol. 94 No. 9 (November 1), 1999:
pp. 2945-2954
Increased Sensitivity to Complement and a Decreased Red Blood Cell Life
Span in Mice Mosaic for a Nonfunctional Piga Gene
G. Tremml,
C. Dominguez,
V. Rosti,
Z. Zhang,
P.P. Pandolfi,
P. Keller, and
M. Bessler
From the Department of Human Genetics, Memorial Sloan-Kettering
Cancer Center, New York, NY; and the Division of
Hematology, Department of Medicine, Washington University School
of Medicine, St Louis, MO.
The gene PIGA encodes one of the protein subunits of the
1-6-N acetylglucosaminyltransferase complex, which catalyses an early step in the biosynthesis of glycosyl phosphatidylinositol (GPI)
anchors. PIGA is somatically mutated in blood cells from patients with paroxysmal nocturnal hemoglobinuria (PNH), leading to
deficiency of GPI-linked proteins on the cell surface. To investigate in detail how inactivating mutations of the PIGA gene affect
hematopoiesis, we generated a mouse line, in which
loxP-mediated excision of part of exon 2 occurs on the
expression of Cre. After crossbreeding with EIIa-cre transgenic
mice, recombination occurs early in embryonic life. Mice that are
mosaics for the recombined Piga gene are viable and lack
GPI-linked proteins on a proportion of circulating blood cells. This
resembles the coexistence of normal cells and PNH cells in patients
with an established PNH clone. PIGA( ) blood cells in mosaic mice
have biologic features characteristic of those classically seen in
patients with PNH, including an increased sensitivity toward complement
mediated lysis and a decreased life span in circulation. However,
during the 12-month follow-up, the PIGA( ) cell population did not
increase, clearly showing that a Piga gene mutation is not
sufficient to cause the human disease, PNH.

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