Distinct origins of adult and embryonic blood in Xenopus - PubMed (original) (raw)
Distinct origins of adult and embryonic blood in Xenopus
A Ciau-Uitz et al. Cell. 2000.
Free article
Abstract
Whether embryonic and adult blood derive from a single (yolk sac) or dual (yolk sac plus intraembryonic) origin is controversial. Here, we show, in Xenopus, that the yolk sac (VBI) and intraembryonic (DLP) blood compartments derive from distinct blastomeres in the 32-cell embryo. The first adult hematopoietic stem cells (HSCs) are thought to form in association with the floor of the dorsal aorta, and we have detected such aortic clusters in Xenopus using hematopoietic markers. Lineage tracing shows that the aortic clusters derive from the blastomere that gives rise to the DLP. These observations indicate that the first adult HSCs arise independently of the embryonic lineage.
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