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Developmental Biology

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https://www.readbyqxmd.com/read/28322737/the-tead-family-transcription-factor-scalloped-regulates-blood-progenitor-maintenance-and-proliferation-in-drosophila-through-pdgf-vegfr-receptor-pvr-signaling
#1
Gabriel B Ferguson, Julian A Martinez-Agosto
The Drosophila lymph gland is a well-characterized hematopoietic organ in which a population of multipotent stem-like progenitors is maintained by a combination of signals from different cellular populations within the organ. The lymph gland serves as an ideal model both for the interrogation of signaling mechanisms involved in progenitor maintenance as well as a tool for the identification of novel regulatory mechanisms in the highly conserved process of hematopoiesis. Here, we demonstrate a requirement for the TEAD transcription factor Scalloped in the maintenance and proliferation of hematopoietic progenitors...
March 18, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28322736/sall1-and-sall4-repress-pou5f3-family-expression-to-allow-neural-patterning-differentiation-and-morphogenesis-in-xenopus-laevis
#2
Cameron R T Exner, Albert Y Kim, Sarah M Mardjuki, Richard M Harland
The embryonic precursor of the vertebrate central nervous system, the neural plate, is patterned along the anterior-posterior axis and shaped by morphogenetic movements early in development. We previously identified the genes sall1 and sall4, known regulators of pluripotency in other contexts, as transcriptional targets of developmental signaling pathways that regulate neural development. Here, we demonstrate that these two genes are required for induction of posterior neural fates, the cell shape changes that contribute to neural tube closure, and later neurogenesis...
March 18, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28322734/the-activity-of-the-drosophila-vestigial-protein-is-modified-by-scalloped-dependent-phosphorylation
#3
Virginia L Pimmett, Hua Deng, Julie A Haskins, Rebecca J Mercier, Paul G LaPointe, Andrew J Simmonds
The Drosophila vestigial gene is required for proliferation and differentiation of the adult wing and for differentiation of larval and adult muscle identity. Vestigial is part of a multi-protein transcription factor complex, which includes Scalloped, a TEAD-class DNA binding protein. Binding Scalloped is necessary for translocation of Vestigial into the nucleus. We show that Vestigial is extensively post-translationally modified and at least one of these modifications is required for proper function during development...
March 18, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28322738/imaging-early-embryonic-calcium-activity-with-gcamp6s-transgenic-zebrafish
#4
Jiakun Chen, Li Xia, Michael R Bruchas, Lilianna Solnica-Krezel
Intracellular Ca(2+) signaling regulates cellular activities during embryogenesis and in adult organisms. We generated stable Tg[βactin2:GCaMP6s](stl351) and Tg[ubi:GCaMP6s](stl352) transgenic lines that combine the ubiquitously-expressed Ca(2+) indicator GCaMP6s with the transparent characteristics of zebrafish embryos to achieve superior in vivo Ca(2+) imaging. Using the Tg[βactin2:GCaMP6s](stl351) line featuring strong GCaMP6s expression from cleavage through gastrula stages, we detected higher frequency of Ca(2+) transients in the superficial blastomeres during the blastula stages preceding the midblastula transition...
March 17, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28322735/stella-collaborates-in-distinct-mesendodermal-cell-subpopulations-at-the-fetal-placental-interface-in-the-mouse-gastrula
#5
Adam D Wolfe, Adriana M Rodriguez, Karen M Downs
The allantois-derived umbilical component of the chorio-allantoic placenta shuttles fetal blood to and from the chorion, thereby ensuring fetal-maternal exchange. The progenitor populations that establish and supply the fetal-umbilical interface lie, in part, within the base of the allantois, where the germ line is claimed to segregate from the soma. Results of recent studies in the mouse have reported that STELLA (DPPA-3, PGC7) co-localizes with PRDM1 (BLIMP1), the bimolecular signature of putative primordial germ cells (PGCs) throughout the fetal-placental interface...
March 16, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28315297/paxillin-genes-and-actomyosin-contractility-regulate-myotome-morphogenesis-in-zebrafish
#6
Andrew E Jacob, Jeffrey D Amack, Christopher E Turner
Paxillin (Pxn) is a key adapter protein and signaling regulator at sites of cell-extracellular matrix (ECM) adhesion. Here, we investigated the role of Pxn during vertebrate development using the zebrafish embryo as a model system. We have characterized two Pxn genes, pxna and pxnb, in zebrafish that are maternally supplied and expressed in multiple tissues. Gene editing and antisense gene knockdown approaches were used to uncover Pxn functions during zebrafish development. While mutation of either pxna or pxnb alone did not cause gross embryonic phenotypes, double mutants lacking maternally supplied pxna or pxnb displayed defects in cardiovascular, axial, and skeletal muscle development...
March 14, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28315296/annexin-a6-controls-neuronal-membrane-dynamics-throughout-chick-cranial-sensory-gangliogenesis
#7
Ankita Shah, Andrew T Schiffmacher, Lisa A Taneyhill
Cranial sensory ganglia are components of the peripheral nervous system that possess a significant somatosensory role and include neurons within the trigeminal and epibranchial nerve bundles. Although it is well established that these ganglia arise from interactions between neural crest and neurogenic placode cells, the molecular basis of ganglia assembly is still poorly understood. Members of the Annexin protein superfamily play key roles in sensory nervous system development throughout metazoans. Annexin A6 is expressed in chick trigeminal and epibranchial placode cell-derived neuroblasts and neurons, but its function in cranial ganglia formation has not been elucidated...
March 14, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28300568/homeostatic-response-to-blocking-cell-division-in-drosophila-imaginal-discs-role-of-the-fat-dachsous-ft-ds-pathway
#8
Antonio J Montes, Ginés Morata
One major problem in developmental biology is the identification of the mechanisms that control the final size of tissues and organs. We are addressing this issue in the imaginal discs of Drosophila by analysing the response to blocking cell division in large domains in the wing and leg discs. The affected domains may be zones of restricted lineage like compartments, or zones of open lineage that may integrate cells from the surrounding territory. Our results reveal the existence of a powerful homeostatic mechanism that can compensate for gross differences in growth rates and builds structures of normal size...
March 11, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28286175/cilia-dependent-gli-processing-in-neural-crest-cells-is-required-for-tongue-development
#9
Grethel Millington, Kelsey Elliott, Ya-Ting Chang, Ching-Fang Chang, Andrzej Dlugosz, Samantha A Brugmann
Ciliopathies are a class of diseases caused by the loss of a ubiquitous, microtubule-based organelle called a primary cilium. Ciliopathies commonly result in defective development of the craniofacial complex, causing midfacial defects, craniosynostosis, micrognathia and aglossia. Herein, we explored how the conditional loss of primary cilia on neural crest cells (Kif3a(f/f);Wnt1-Cre) generated aglossia. On a cellular level, our data revealed that aglossia in Kif3a(f/f);Wnt1-Cre embryos was due to a loss of mesoderm-derived muscle precursors migrating into and surviving in the tongue anlage...
March 9, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28284906/bone-morphogenetic-protein-bmp-signaling-in-animal-reproductive-system-development-and-function
#10
REVIEW
Amaneet K Lochab, Cassandra G Extavour
In multicellular organisms, the specification, maintenance, and transmission of the germ cell lineage to subsequent generations are critical processes that ensure species survival. A number of studies suggest that the Bone Morphogenetic Protein (BMP) pathway plays multiple roles in this cell lineage. We wished to use a comparative framework to examine the role of BMP signaling in regulating these processes, to determine if patterns would emerge that might shed light on the evolution of molecular mechanisms that may play germ cell-specific or reproductive roles across species...
March 8, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28284905/embryonic-mosaic-deletion-of-app-results-in-displaced-reelin-expressing-cells-in-the-cerebral-cortex
#11
D G Callahan, W M Taylor, M Tilearcio, T Cavanaugh, D J Selkoe, T L Young-Pearse
It is widely accepted that amyloid precursor protein (APP) plays a central role in the pathogenesis of Alzheimer's disease. In addition, APP has been proposed to have functions in numerous biological processes including neuronal proliferation, differentiation, migration, axon guidance, and neurite outgrowth, as well as in synapse formation and function. However, germline knockout of APP yields relatively subtle phenotypes, and brain development appears grossly normal. This is thought to be due in part to functional compensation by APP family members and other type I transmembrane proteins...
March 8, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28283407/cellular-aspects-of-gonadal-atrophy-in-drosophila-p-m-hybrid-dysgenesis
#12
Natalia V Dorogova, Elena Us Bolobolova, Lyudmila P Zakharenko
Gonadal atrophy is the most typical and dramatic manifestation of intraspecific hybrid dysgenesis syndrome leading to sterility in Drosophila melanogaster dysgenic progeny. The P-M system of hybrid dysgenesis is primarily associated with germ cell degeneration during the early stages of Drosophila embryonic development at elevated temperatures. In the present study, we have defined the phase of germ cell death as beginning at the end of embryogenesis immediately following gonad formation. However, the temperature-dependent screening of germ cell developmental patterns in the dysgenic background showed that early germ cells are susceptible to the hybrid dysgenesis at any Drosophila life-cycle stage, including in the imago...
March 7, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28283406/transcriptomic-insights-into-genetic-diversity-of-protein-coding-genes-in-x-laevis
#13
Virginia Savova, Esther J Pearl, Elvan Boke, Anwesha Nag, Ivan Adzhubei, Marko E Horb, Leonid Peshkin
We characterize the genetic diversity of Xenopus laevis strains using RNA-seq data and allele-specific analysis. This data provides a catalogue of coding variation, which can be used for improving the genomic sequence, as well as for better sequence alignment, probe design, and proteomic analysis. In addition, we paint a broad picture of the genetic landscape of the species by functionally annotating different classes of mutations with a well-established prediction tool (PolyPhen-2). Further, we specifically compare the variation in the progeny of four crosses: inbred genomic (J)-strain, outbred albino (B)-strain, and two hybrid crosses of J and B strains...
March 7, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28283405/coordination-of-limb-development-by-crosstalk-among-axial-patterning-pathways
#14
REVIEW
Irene Delgado, Miguel Torres
Vertebrate limb development relies on the activity of signaling centers that promote growth and control patterning along three orthogonal axes of the limb bud. The apical ectodermal ridge, at the distal rim of the limb bud ectoderm, produces WNT and FGF signals, which promote limb bud growth and progressive distalization. The zone of polarizing activity, a discrete postero-distal mesenchymal domain, produces SHH, which stimulates growth and organizes patterning along the antero-posterior axis. The dorsal and ventral ectoderms produce, respectively, WNT7A and BMPs, which induce dorso-ventral limb fates...
March 7, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28279710/satellite-like-cells-contribute-to-pax7-dependent-skeletal-muscle-repair-in-adult-zebrafish
#15
Michael A Berberoglu, Thomas L Gallagher, Zachary T Morrow, Jared C Talbot, Kimberly J Hromowyk, Inês M Tenente, David M Langenau, Sharon L Amacher
Satellite cells, also known as muscle stem cells, are responsible for skeletal muscle growth and repair in mammals. Pax7 and Pax3 transcription factors are established satellite cell markers required for muscle development and regeneration, and there is great interest in identifying additional factors that regulate satellite cell proliferation, differentiation, and/or skeletal muscle regeneration. Due to the powerful regenerative capacity of many zebrafish tissues, even in adults, we are exploring the regenerative potential of adult zebrafish skeletal muscle...
March 7, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28279709/vegf-signaling-promotes-vascular-endothelial-differentiation-by-modulating-etv2-expression
#16
Satish Casie Chetty, Megan S Rost, Jacob Ryan Enriquez, Jennifer A Schumacher, Kristina Baltrunaite, Andrea Rossi, Didier Y R Stainier, Saulius Sumanas
Vasculogenesis involves the differentiation of vascular endothelial progenitors de novo from undifferentiated mesoderm, their migration and coalescence to form the major embryonic vessels and the acquisition of arterial or venous identity. Vascular Endothelial Growth Factor (Vegf) signaling plays multiple roles during vascular development. However, its function during embryonic vasculogenesis has been controversial. Previous studies have implicated Vegf signaling in either regulating arteriovenous specification or overall vascular endothelial differentiation...
March 7, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28274610/retinoic-acid-signaling-is-dispensable-for-somatic-development-and-function-in-the-mammalian-ovary
#17
Anna Minkina, Robin E Lindeman, Micah D Gearhart, Anne-Amandine Chassot, Marie-Christine Chaboissier, Norbert B Ghyselinck, Vivian J Bardwell, David Zarkower
Retinoic acid (RA) is a potent inducer of cell differentiation and plays an essential role in sex-specific germ cell development in the mammalian gonad. RA is essential for male gametogenesis and hence fertility. However, RA can also disrupt sexual cell fate in somatic cells of the testis, promoting transdifferentiation of male Sertoli cells to female granulosa-like cells when the male sexual regulator Dmrt1 is absent. The feminizing ability of RA in the Dmrt1 mutant somatic testis suggests that RA might normally play a role in somatic cell differentiation or cell fate maintenance in the ovary...
March 6, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28263767/shr-overexpression-induces-the-formation-of-supernumerary-cell-layers-with-cortex-cell-identity-in-rice
#18
S Henry, A Dievart, D Fanchon, G Pauluzzi, D Meynard, R Swarup, S Wu, C M Lee, K Gallagher, C Périn
The number of root cortex cell layers varies among plants, and many species have several cortical cell layers. We recently demonstrated that the two rice orthologs of the Arabidopsis SHR gene, OsSHR1 and OsSHR2, could complement the A. thaliana shr mutant. Moreover, OsSHR1 and OsSHR2 expression in A. thaliana roots induced the formation of extra root cortical cell layers. In this article, we demonstrate that the overexpression of AtSHR and OsSHR2 in rice roots leads to plants with wide and short roots that contain a high number of extra cortical cell layers...
March 2, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28263766/shh-e176-e177-zn-2-conformation-is-required-for-signaling-at-endogenous-sites
#19
Diana S Himmelstein, Ivelisse Cajigas, Chunming Bi, Brian S Clark, Grant Van Der Voort, Jhumku D Kohtz
Sonic hedgehog (SHH) is a master developmental regulator. In 1995, the SHH crystal structure predicted that SHH-E176 (human)/E177 (mouse) regulates signaling through a Zn(2+)-dependent mechanism. While Zn(2+) is known to be required for SHH protein stability, a regulatory role for SHH-E176 or Zn(2+) has not been described. Here, we show that SHH-E176/177 modulates Zn(2+)-dependent cross-linking in vitro and is required for endogenous signaling, in vivo. While ectopically expressed SHH-E176A is highly active, mice expressing SHH-E177A at endogenous sites (Shh(E177A/-)) are morphologically indistinguishable from mice lacking SHH (Shh(-/-)), with patterning defects in both embryonic spinal cord and forebrain...
March 2, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28259755/chordin-and-dickkopf-1b-are-essential-for-the-formation-of-head-structures-through-activation-of-the-fgf-signaling-pathway-in-zebrafish
#20
Shingo Tanaka, Hiroshi Hosokawa, Eric S Weinberg, Shingo Maegawa
The ability of the Spemann organizer to induce dorsal axis formation is dependent on downstream factors of the maternal Wnt/β-catenin signaling pathway. The fibroblast growth factor (FGF) signaling pathway has been identified as one of the downstream components of the maternal Wnt/β-catenin signaling pathway. The ability of the FGF signaling pathway to induce the formation of a dorsal axis with a complete head structure requires chordin (chd) expression; however, the molecular mechanisms involved in this developmental process, due to activation of FGF signaling, remain unclear...
March 1, 2017: Developmental Biology
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