yolk syncytial layer ysl | teleostean yolk layer yolk syncytial layer ysl We show that injection of RNase into the yolk cell after the 1K cell stage (3 hours) effectively eliminates YSL transcripts without affecting ubiquitously expressed genes in the blastoderm.
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0 · zebrafish yolk syncytial layer
1 · ysl in zebrafish
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4 · ysl cell press
5 · yolk syncytial layer
6 · teleostean yolk layer
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The yolk syncytial layer (YSL) plays crucial roles in early zebrafish development. The YSL is a transient extra-embryonic syncytial tissue that forms during early cleavage . The yolk syncytial layer (YSL) forms at the mid-blastula (512-1k cell stage), when some of the marginal blastomeres divide and release their nuclei . Here we show that zebrafish solute carrier family 3 member 2 (Slc3a2) is expressed specifically in the YSL and that slc3a2 knockdown causes severe YSL defects including .The yolk syncytial layer (YSL) is a provisory extraembryonic structure of teleost fishes and representatives of some other taxa with meroblastic cleavage. The YSL of teleosts is a .
We have developed a novel technique to study signaling from the YSL in which we specifically eliminate RNAs in the YSL, thus addressing the in vivo requirement of RNA .We show that injection of RNase into the yolk cell after the 1K cell stage (3 hours) effectively eliminates YSL transcripts without affecting ubiquitously expressed genes in the blastoderm. The yolk syncytial layer (YSL) is a multinucleate layer of non-yolky cytoplasm immediately beneath the cellular blastoderm. It is the first lineage-restricted extraembryonic . The yolk syncytial layer (YSL) plays crucial roles in early zebrafish development. The YSL is a transient extra-embryonic syncytial tissue that forms during early cleavage .
Zebrafish apolipoprotein genes are expressed in the yolk syncytial layer (YSL). The developing zebrafish embryo gradually absorbs lipids from its yolk (a), which is .The yolk syncytial layer (YSL) is a provisory extraembryonic structure of teleost fishes and representatives of some other taxa with meroblastic cleavage. The YSL of teleosts is a symplast with polymorphous polyploid nuclei. It is known to perform nutritional, morphogenetic, immune, and, probably, o . ABSTRACT. Formation of the three germ layers requires a series of inductive events during early embryogenesis. Studies in zebrafish indicate that the source of these inductive signals may be the extra-embryonic yolk syncytial layer (YSL). The characterization of genes encoding the nodal-related factor, Squint, and homeodomain protein, Bozozok, both of .
The yolk syncytial layer (YSL) plays crucial roles in early zebrafish development. The YSL is a transient extra-embryonic syncytial tissue that forms during early cleavage stages and persists until larval stages. During gastrulation, the YSL undergoes highly dynamic movements, which are tightly coordinated with the movements of the overlying germ layer . The yolk syncytial layer (YSL) is a symplastic provisory system that forms at the early stages of embryogenesis of teleosts. The YSL serves morphogenetic, trophic, and immune functions. Despite its important role in development, data on the structure of YSL is scarce. In the present study, comparative histological research on the features of . A snapshot of what is currently known about intrauterine chick development is provided and key issues that await further clarification are identified, including the process of cellularization, allocation of maternal determinants, zygotic gene activation, mid‐blastula transition, cell layer increase and reduction, radial symmetry breaking, early lineage .
Yolk syncytial layer (YSL) extra-embryonic tissue formed during the blastula stage, which can be subdivided into the external YSL (eYSL) and the internal YSL (iYSL). The eYSL includes the yolk syncytial nuclei (YSN) that are positioned as a marginal band of nuclei in front of the border between the YSL and the enveloping cell layer (EVL). . Genome-wide transcription analysis revealed that nanog-like morphants fail to develop the extraembryonic yolk syncytial layer (YSL), which produces Nodal, required for endoderm induction. We examined the genes that were regulated by Nanog-like and identified the homeobox gene mxtx2, which is both necessary and sufficient for YSL induction. The yolk syncytial layer (YSL) plays crucial roles in early zebrafish development. The YSL is a transient extra-embryonic syncytial tissue that forms during early cleavage stages and persists . Studies in zebrafish indicate that the source of these inductive signals may be the extra-embryonic yolk syncytial layer (YSL). The characterization of genes encoding the nodal-related factor, Squint, and homeodomain protein, Bozozok, both of which are expressed in the YSL, suggested that the YSL has a role in mesendoderm induction.
zebrafish yolk syncytial layer
The EVL and YSL are connected by tight junctions (TJ). - "The yolk syncytial layer in early zebrafish development." Figure 2. Schematic representation of gastrulation movements. . The dynamics of zebrafish YSL show that a syncytial endodermal germ layer can express a temporal sequence of morphogenetic domains without undergoing progressive . In teleost fishes, the yolk is enclosed in the yolk syncytial layer (YSL), the extraembryonic tissue derived from fusion of marginal blastomeres and the yolk cell (16, 17). To date, roles of YSL have been reported in the context of morphogenesis (for review, see Ref. ). However, its contribution to yolk handling has been less reported, despite .The yolk syncytial layer (YSL) in the zebrafish embryo is a multinu-cleated syncytium essential for embryo development, but the molecular mechanisms underlying YSL formation remain largely unknown. Here we show that zebrafish solute carrier family 3Studies in zebrafish indicate that the source of these inductive signals may be the extra-embryonic yolk syncytial layer (YSL). The characterization of genes encoding the nodal-related factor, Squint, and homeodomain protein, Bozozok, both of which are expressed in the YSL, suggested that the YSL has a role in mesendoderm induction.
Similarly, in zebrafish, the extra-embryonic yolk syncytial layer (YSL) is known to function as an important signaling center for mesoderm induction and early dorsoventral patterning (Mizuno et al., 1996; Chen and Kimelman,2000) (reviewed by Sakaguchi et al., 2002). However, little is known about the roles the extra-embryonic tissues might play .
boly. Normal nuclear divisions in the YSL were also Fig. 1. Visualization of yolk syncytial layer (YSL) nuclei in living zebrafish embryos. Sytox Green, a membrane-impermeant vital nuclear stain, was injected into the yolk cell of late blastula (sphere stage) embryos. A,B: At 30 hr of development, the zebrafish yolk cell displays a
The yolk syncytial layer (YSL) is a multifunctional transient structure of teleost embryos and larvae. The YSL performs nutritional, morphogenetic and immune func-tions. However, the data on the . Introduction. The yolk syncytial layer (YSL) is a multinucleate layer of non-yolky cytoplasm immediately beneath the cellular blastoderm. It is the first lineage-restricted extraembryonic structure to form in the zebrafish embryo (Kimmel et al., 1995).Although it does not contribute cells or nuclei to the embryo, it is nevertheless important for embryonic .
The yolk consists of a lipid and protein rich core with a cellular syncytium at its periphery, called the yolk syncytial layer (YSL). The YSL exports amino acids, hydrolyzes complex lipids to release fatty acids, and synthesizes lipoproteins, which export lipid to the developing embryo until it is able to feed independently ( 10 ). Besides the acellular yolk, the teleost-specific yolk syncytial layer (YSL) and the superficial epithelial enveloping layer are recognized as extraembryonic structures that play critical roles throughout embryonic development. They provide enriched microenvironments in which molecular feedback loops, cellular interactions and mechanical signals .
Abstract The structure of the yolk syncytial layer (YSL) of late embryos and larvae of the three-spined stickleback Gasterosteus aculeatus L. has been studied by histological methods. The YSL structure in this species has specific features that are related to the process of yolk utilization and features that are common for YSL of bony fishes, which are the structural .
forming the outer surface of the blastoderm, and the yolk syncytial layer (YSL) that covers the animal part of the yolk cell, respectively. The third lineage, termed the deep cell layer, will form the embryo proper. One unique and fascinating feature of early teleost development is the .
The yolk cell is multinucleate; the nuclei and most of the nonyolky uncleaved cytoplasm are present as a layer, the "yolk syncytial layer (YSL)" (Betchaku and Trinkaus, 1978) underlying the cellular blastoderm. The manner of formation of the YSL was discovered by Agassiz and Whitman (1884), and de- scribed carefully by Wilson (1889). .The yolk syncytial layer (YSL) is a provisory extraembryonic structure of teleost fishes and representatives of some other taxa with meroblastic cleavage. The YSL of teleosts is a symplast with polymorphous polyploid nuclei. It is known to perform nutritional, morphogenetic, immune, and, probably, other functions. .The first of these is the yolk syncytial layer (YSL). The YSL is formed at the ninth or tenth cell cycle, when the cells at the vegetal edge of the blastoderm fuse with the underlying yolk cell. This fusion produces a ring of nuclei within the part of the .
The YSL is an extra-embryonic structure and it forms at the stage of mid-blastula transition (MBT) in teleosts [1, 2] by a poorly understood developmental mechanism.The YSL performs several early developmental functions such as yolk metabolism, nutrient transport [], utilization of maternally stored morphogenetic substances including retinoids [4, 5], and . This expression domain, called the yolk syncytial layer (YSL), is an extra-embryonic layer composed of yolk syncytial nuclei that move ahead of blastomeres during epiboly.
Two of these lineages are extra-embryonic, the enveloping layer (EVL) forming the outer surface of the blastoderm, and the yolk syncytial layer (YSL) that covers the animal part of the yolk cell, respectively. The third lineage, termed the deep cell layer, will form the embryo proper.
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ysl in zebrafish
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yolk syncytial layer ysl|teleostean yolk layer
