摘要：The YPEL family genes are highly conserved across a diverse range of eukaryotic organisms and thus potentially involved in essential cellular processes.
Ypel4, one of five YPEL family gene orthologs in mouse and human, is highly and specifically expressed in late terminal erythroid differentiation (TED). In this study, we investigated the role of
Ypel4 in murine erythropoiesis, providing for the first time an in-depth description of a
Ypel4-null phenotype in vivo. We demonstrated that the
Ypel4-null mice displayed a secondary polycythemia with macro- and reticulocytosis. While lack of
Ypel4 did not affect steady-state TED in the bone marrow or spleen, the anemia-recovering capacity of
Ypel4-null cells was diminished. Furthermore,
Ypel4-null red blood cells (RBC) were cleared from the circulation at an increased rate, demonstrating an intrinsic defect of RBCs. Scanning electron micrographs revealed an ovalocytic morphology of
Ypel4-null RBCs and functional testing confirmed reduced deformability. Even though Band 3 protein levels were shown to be reduced in
Ypel4-null RBC membranes, we could not find support for a physical interaction between YPEL4 and the Band 3 protein. In conclusion, our findings provide crucial insights into the role of
Ypel4 in preserving normal red cell membrane integrity.
