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Blood 2008 Sep 15;1126:2287-96. doi: 10.1182/blood-2008-04-150268.
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spib is required for primitive myeloid development in Xenopus.

Costa RM , Soto X , Chen Y , Zorn AM , Amaya E .

Vertebrate blood formation occurs in 2 spatially and temporally distinct waves, so-called primitive and definitive hematopoiesis. Although definitive hematopoiesis has been extensively studied, the development of primitive myeloid blood has received far less attention. In Xenopus, primitive myeloid cells originate in the anterior ventral blood islands, the equivalent of the mammalian yolk sac, and migrate out to colonize the embryo. Using fluorescence time-lapse video microscopy, we recorded the migratory behavior of primitive myeloid cells from their birth. We show that these cells are the first blood cells to differentiate in the embryo and that they are efficiently recruited to embryonic wounds, well before the establishment of a functional vasculature. Furthermore, we isolated spib, an ETS transcription factor, specifically expressed in primitive myeloid precursors. Using spib antisense morpholino knockdown experiments, we show that spib is required for myeloid specification, and, in its absence, primitive myeloid cells retain hemangioblast-like characteristics and fail to migrate. Thus, we conclude that spib sits at the top of the known genetic hierarchy that leads to the specification of primitive myeloid cells in amphibians.

PubMed ID: 18594023
PMC ID: PMC2577559
Article link: Blood
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: cebpa clstn2 fli1 hbe1 mmp7 mpo mrc1 naa50 runx2 spi1 spib tal1
GO keywords: hematopoietic progenitor cell differentiation [+]
Morpholinos: spib MO1 spib MO2

Phenotypes: Xla Wt + spib MO (fig.5.b) [+]

Article Images: [+] show captions
References [+] :
Ciau-Uitz, Distinct origins of adult and embryonic blood in Xenopus. 2000, Pubmed, Xenbase