Impaired yolk sac erythropoiesis in Gata1s
embryos. (A) Western blot to detect the expression of GATA1
full length (GATA1) in WT embryos and the short isoform (GATA1s) in
Gata1s mutant embryos (G1s). Cell lysates were
extracted from E13.5 total fetal liver cells. Heat shock protein family
A member 8 (HSC70) is shown as a loading control. (B) Flow cytometry
assessment of the erythroid (Ery) population in E9.5 yolk sac (YS) using
double-staining with antibodies against c-kit and Ter119. (C) Bar graph
depicting mean (± SD) percentages of Ter119 positive, c-kit
positive, EMP) and megakaryocyte (Mk) populations from yolk sacs of E9.5
WT and G1s as determined by flow cytometry. N ≥ 3. (D)
Representative flow cytometry plots of EMPs and Mk stained with
antibodies against c-kit, CD16/32 (FcγRIII and II), Ter119, and
CD41. *P ≤ .05 (unpaired Student
t test).