Dataset Information

Identification of Novel Hemangioblast Genes in the Early Chick Embryo.

ABSTRACT: During early vertebrate embryogenesis, both hematopoietic and endothelial lineages derive from a common progenitor known as the hemangioblast. Hemangioblasts derive from mesodermal cells that migrate from the posterior primitive streak into the extraembryonic yolk sac. In addition to primitive hematopoietic cells, recent evidence revealed that yolk sac hemangioblasts also give rise to tissue-resident macrophages and to definitive hematopoietic stem/progenitor cells. In our previous work, we used a novel hemangioblast-specific reporter to isolate the population of chick yolk sac hemangioblasts and characterize its gene expression profile using microarrays. Here we report the microarray profile analysis and the identification of upregulated genes not yet described in hemangioblasts. These include the solute carrier transporters SLC15A1 and SCL32A1, the cytoskeletal protein RhoGap6, the serine protease CTSG, the transmembrane receptor MRC1, the transcription factors LHX8, CITED4 and PITX1, and the previously uncharacterized gene DIA1R. Expression analysis by in situ hybridization showed that chick DIA1R is expressed not only in yolk sac hemangioblasts but also in particular intraembryonic populations of hemogenic endothelial cells, suggesting a potential role in the hemangioblast-derived hemogenic lineage. Future research into the function of these newly identified genes may reveal novel important regulators of hemangioblast development.

SUBMITTER: Serrado Marques J

PROVIDER: S-EPMC5850097 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature

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Identification of Novel Hemangioblast Genes in the Early Chick Embryo.

Serrado Marques José J Teixeira Vera V Jacinto António A Tavares Ana Teresa AT

Cells 20180131 2

During early vertebrate embryogenesis, both hematopoietic and endothelial lineages derive from a common progenitor known as the hemangioblast. Hemangioblasts derive from mesodermal cells that migrate from the posterior primitive streak into the extraembryonic yolk sac. In addition to primitive hematopoietic cells, recent evidence revealed that yolk sac hemangioblasts also give rise to tissue-resident macrophages and to definitive hematopoietic stem/progenitor cells. In our previous work, we used ...[more]

PMID: 29385069

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Project description:Genetic evidence has implicated several genes as being critical for heart development. However, the inducers of these genes as well as their other targets and the pathways they constitute, remain largely unknown. In the avian embryo, Cerberus (cCer) transcripts are detected in the anterior mesendoderm including the heart precursor cells and in the left lateral plate mesoderm. We have identified a promoter element of chick cCer able to drive EGFP expression into the heart and the hemangioblast precursor cells, allowing us to identify a population of cells that consistently exit from the anterior primitive streak region from as early as stage HH3+ and that later will populate the heart. In order to identify and study novel genes expressed and involved in the correct development and differentiation of the vertebrate H/HPC (Heart/ Hemangioblast Precursor Cells) lineages, a differential screening using Affymetrix GeneChip system technologies was performed. Remarkably, this screening led to the identification of more than 800 transcripts potentially expressed in these precursor lineages. We have identified unknown genes that are differentially expressed in the H/HPC precursor lineages. By developing a procedure to isolate the heart precursor cells using the cer2.5-EGFP construct, we were able to specifically isolate a population of H/HPC expressing already known cardiac markers, and a long list of still uncharacterized genes. From those, we defined by WISH that at least some of these in silico identified transcripts are in fact expressed in these cell populations and more importantly, functionally required for heart formation.More importantly, our study unveiled several uncharacterized genes that can now be used for further studies. Portions of chick embryos were selected and excised at early stages of development for RNA extraction and hybridization on Affymetrix microarrays. We sought to obtain homogeneous populations of embryos at early gastrula stage in order to increase the temporal resolution of expression profiles. To that end, we hand-selected and excised portions of the embryos according to morphological criteria and EGFP expression. Four GeneChip chicken arrays used for another study were added to the two arrays in this study to ensure a robust model for expression value computation (Note: The 4 samples chick_T2-1, chick_T2-2, chick_T2-3, chick_T2-4, were performed by another group and for a different array, and nothing has to do with our data. They were only run at the same time and used for normalization. Raw data unavailable.). The arrays were normalized to a baseline array with median CEL intensity by applying an Invariant Set Normalization Method. Normalized CEL intensities of the six arrays were used to obtain model-based gene expression indices (MBEI) based on a PM (Perfect Match)-only model. Processed data for all 6 samples can be found in supplementary file linked below.

Dataset Information

Identification of Novel Hemangioblast Genes in the Early Chick Embryo.

Publications

Identification of Novel Hemangioblast Genes in the Early Chick Embryo.

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