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Developmental Cell

Qi Li, Niraj K Nirala, Yingchao Nie, Hsi-Ju Chen, Gary Ostroff, Junhao Mao, Qi Wang, Lan Xu, Y Tony Ip
The intestinal epithelium has a high cell turnover rate and is an excellent system to study stem cell-mediated adaptive growth. In the Drosophila midgut, the Ste20 kinase Misshapen, which is distally related to Hippo, has a niche function to restrict intestinal stem cell activity. We show here that, under low growth conditions, Misshapen is localized near the cytoplasmic membrane, is phosphorylated at the threonine 194 by the upstream kinase Tao, and is more active toward Warts, which in turn inhibits Yorkie...
May 9, 2018: Developmental Cell
Matthieu Pierre Platre, Lise C Noack, Mehdi Doumane, Vincent Bayle, Mathilde Laetitia Audrey Simon, Lilly Maneta-Peyret, Laetitia Fouillen, Thomas Stanislas, Laia Armengot, Přemysl Pejchar, Marie-Cécile Caillaud, Martin Potocký, Alenka Čopič, Patrick Moreau, Yvon Jaillais
Membrane surface charge is critical for the transient, yet specific recruitment of proteins with polybasic regions to certain organelles. In eukaryotes, the plasma membrane (PM) is the most electronegative compartment of the cell, which specifies its identity. As such, membrane electrostatics is a central parameter in signaling, intracellular trafficking, and polarity. Here, we explore which are the lipids that control membrane electrostatics using plants as a model. We show that phosphatidylinositol-4-phosphate (PI4P), phosphatidic acidic (PA), and phosphatidylserine (PS) are separately required to generate the electrostatic signature of the plant PM...
May 8, 2018: Developmental Cell
Dana Klatt Shaw, Derrick Gunther, Michael J Jurynec, Alexis A Chagovetz, Erin Ritchie, David Jonah Grunwald
Graded Shh signaling across fields of precursor cells coordinates patterns of gene expression, differentiation, and morphogenetic behavior as precursors form complex structures, such as the nervous system, the limbs, and craniofacial skeleton. Here we discover that intracellular calcium mobilization, a process tightly controlled and readily modulated, regulates the level of Shh-dependent gene expression in responding cells and affects the development of all Shh-dependent cell types in the zebrafish embryo. Reduced expression or modified activity of ryanodine receptor (RyR) intracellular calcium release channels shifted the allocation of Shh-dependent cell fates in the somitic muscle and neural tube...
May 8, 2018: Developmental Cell
Afreen Haider, Yu-Chen Wei, Koini Lim, Antonio D Barbosa, Che-Hsiung Liu, Ursula Weber, Marek Mlodzik, Kadri Oras, Simon Collier, M Mahmood Hussain, Liang Dong, Satish Patel, Anna Alvarez-Guaita, Vladimir Saudek, Benjamin J Jenkins, Albert Koulman, Marcus K Dymond, Roger C Hardie, Symeon Siniossoglou, David B Savage
Cell and organelle membranes consist of a complex mixture of phospholipids (PLs) that determine their size, shape, and function. Phosphatidylcholine (PC) is the most abundant phospholipid in eukaryotic membranes, yet how cells sense and regulate its levels in vivo remains unclear. Here we show that PCYT1A, the rate-limiting enzyme of PC synthesis, is intranuclear and re-locates to the nuclear membrane in response to the need for membrane PL synthesis in yeast, fly, and mammalian cells. By aligning imaging with lipidomic analysis and data-driven modeling, we demonstrate that yeast PCYT1A membrane association correlates with membrane stored curvature elastic stress estimates...
May 7, 2018: Developmental Cell
Megan Addison, Qiling Xu, Jordi Cayuso, David G Wilkinson
The patterning of tissues to form subdivisions with distinct and homogeneous regional identity is potentially disrupted by cell intermingling. Transplantation studies suggest that homogeneous segmental identity in the hindbrain is maintained by identity switching of cells that intermingle into another segment. We show that switching occurs during normal development and is mediated by feedback between segment identity and the retinoic acid degrading enzymes, cyp26b1 and cyp26c1. egr2, which specifies the segmental identity of rhombomeres r3 and r5, underlies the lower expression level of cyp26b1 and cyp26c1 in r3 and r5 compared with r2, r4, and r6...
April 30, 2018: Developmental Cell
Chen Huang, Emily M Walker, Prasanna K Dadi, Ruiying Hu, Yanwen Xu, Wenjian Zhang, Tiziana Sanavia, Jisoo Mun, Jennifer Liu, Gopika G Nair, Hwee Yim Angeline Tan, Sui Wang, Mark A Magnuson, Christian J Stoeckert, Matthias Hebrok, Maureen Gannon, Weiping Han, Roland Stein, David A Jacobson, Guoqiang Gu
Islet β cells from newborn mammals exhibit high basal insulin secretion and poor glucose-stimulated insulin secretion (GSIS). Here we show that β cells of newborns secrete more insulin than adults in response to similar intracellular Ca2+ concentrations, suggesting differences in the Ca2+ sensitivity of insulin secretion. Synaptotagmin 4 (Syt4), a non-Ca2+ binding paralog of the β cell Ca2+ sensor Syt7, increased by ∼8-fold during β cell maturation. Syt4 ablation increased basal insulin secretion and compromised GSIS...
April 12, 2018: Developmental Cell
Zhe Liang, Lisha Shen, Xuean Cui, Shengjie Bao, Yuke Geng, Guoliang Yu, Fan Liang, Shang Xie, Tiegang Lu, Xiaofeng Gu, Hao Yu
DNA methylation on N6 -adenine (6mA) has recently been found to be a potentially epigenetic mark in several unicellular and multicellular eukaryotes. However, its distribution patterns and potential functions in land plants, which are primary producers for most ecosystems, remain largely unknown. Here we report global profiling of 6mA sites at single-nucleotide resolution in the genome of Arabidopsis thaliana at different developmental stages using single-molecule real-time sequencing. 6mA sites are widely distributed across the Arabidopsis genome and enriched over the pericentromeric heterochromatin regions...
April 12, 2018: Developmental Cell
Natalia Mora, Carlos Oliva, Mark Fiers, Radoslaw Ejsmont, Alessia Soldano, Ting-Ting Zhang, Jiekun Yan, Annelies Claeys, Natalie De Geest, Bassem A Hassan
The importance of producing the correct numbers of neurons during development is illustrated by both evolutionary enhancement of cognitive capacities in larger brains, and developmental disorders of brain size. In humans, increased neuronal numbers during development is speculated to partly derive from a unique subtype of neural stem cells (NSCs) that undergo a phase of expansion through symmetric self-amplifying divisions before generating neurons. Symmetric amplification also appears to underlie adult neural stem maintenance in the mouse...
March 20, 2018: Developmental Cell
Jorge Fung-Uceda, Kyounghee Lee, Pil Joon Seo, Stefanie Polyn, Lieven De Veylder, Paloma Mas
The circadian clock and cell cycle as separate pathways have been well documented in plants. Elucidating whether these two oscillators are connected is critical for understanding plant growth. We found that a slow-running circadian clock decelerates the cell cycle and, conversely, a fast clock speeds it up. The clock component TOC1 safeguards the G1 -to-S transition and controls the timing of the mitotic cycle at early stages of leaf development. TOC1 also regulates somatic ploidy at later stages of leaf development and in hypocotyl cells...
March 19, 2018: Developmental Cell
Daniel J Merk, Jasmin Ohli, Natalie D Merk, Venu Thatikonda, Sorana Morrissy, Melanie Schoof, Susanne N Schmid, Luke Harrison, Severin Filser, Julia Ahlfeld, Serap Erkek, Kaamini Raithatha, Thomas Andreska, Marc Weißhaar, Michael Launspach, Julia E Neumann, Mehdi Shakarami, Dennis Plenker, Marco A Marra, Yisu Li, Andrew J Mungall, Richard A Moore, Yussanne Ma, Steven J M Jones, Beat Lutz, Birgit Ertl-Wagner, Andrea Rossi, Rabea Wagener, Reiner Siebert, Andreas Jung, Charles G Eberhart, Boleslaw Lach, Michael Sendtner, Stefan M Pfister, Michael D Taylor, Lukas Chavez, Marcel Kool, Ulrich Schüller
Recurrent mutations in chromatin modifiers are specifically prevalent in adolescent or adult patients with Sonic hedgehog-associated medulloblastoma (SHH MB). Here, we report that mutations in the acetyltransferase CREBBP have opposing effects during the development of the cerebellum, the primary site of origin of SHH MB. Our data reveal that loss of Crebbp in cerebellar granule neuron progenitors (GNPs) during embryonic development of mice compromises GNP development, in part by downregulation of brain-derived neurotrophic factor (Bdnf)...
March 9, 2018: Developmental Cell
Kayla Carpenter, Rachel Brietta Bell, Julius Yunus, Angelika Amon, Luke Edwin Berchowitz
Amyloids are fibrous protein assemblies that are often described as irreversible and intrinsically pathogenic. However, yeast cells employ amyloid-like assemblies of the RNA-binding protein Rim4 to control translation during meiosis. Here, we show that multi-site phosphorylation of Rim4 is critical for its regulated disassembly and degradation and that failure to clear Rim4 assemblies interferes with meiotic progression. Furthermore, we identify the protein kinase Ime2 to bring about Rim4 clearance via phosphorylation of Rim4's intrinsically disordered region...
May 7, 2018: Developmental Cell
Jiakun Chen, Gina D Castelvecchi, Nanbing Li-Villarreal, Brian Raught, Andrzej M Krezel, Helen McNeill, Lilianna Solnica-Krezel
Atypical cadherin Dachsous (Dchs) is a conserved regulator of planar cell polarity, morphogenesis, and tissue growth during animal development. Dchs functions in part by regulating microtubules by unknown molecular mechanisms. Here we show that maternal zygotic (MZ) dchs1b zebrafish mutants exhibit cleavage furrow progression defects and impaired midzone microtubule assembly associated with decreased microtubule turnover. Mechanistically, Dchs1b interacts via a conserved motif in its intracellular domain with the tetratricopeptide motifs of Ttc28 and regulates its subcellular distribution...
May 7, 2018: Developmental Cell
Wei Zou, Xintong Dong, Timothy R Broederdorf, Ao Shen, Daniel A Kramer, Rebecca Shi, Xing Liang, David M Miller, Yang K Xiang, Ryohei Yasuda, Baoyu Chen, Kang Shen
Proper morphogenesis of dendrites plays a fundamental role in the establishment of neural circuits. The molecular mechanism by which dendrites grow highly complex branches is not well understood. Here, using the Caenorhabditis elegans PVD neuron, we demonstrate that high-order dendritic branching requires actin polymerization driven by coordinated interactions between two membrane proteins, DMA-1 and HPO-30, with their cytoplasmic interactors, the RacGEF TIAM-1 and the actin nucleation promotion factor WAVE regulatory complex (WRC)...
May 7, 2018: Developmental Cell
Aparna Ratheesh, Julia Biebl, Jana Vesela, Michael Smutny, Ekaterina Papusheva, S F Gabriel Krens, Walter Kaufmann, Attila Gyoergy, Alessandra Maria Casano, Daria E Siekhaus
Migrating cells penetrate tissue barriers during development, inflammatory responses, and tumor metastasis. We study if migration in vivo in such three-dimensionally confined environments requires changes in the mechanical properties of the surrounding cells using embryonic Drosophila melanogaster hemocytes, also called macrophages, as a model. We find that macrophage invasion into the germband through transient separation of the apposing ectoderm and mesoderm requires cell deformations and reductions in apical tension in the ectoderm...
May 7, 2018: Developmental Cell
Yuan-Hung Chien, Shyam Srinivasan, Ray Keller, Chris Kintner
The Xenopus left-right organizer (LRO) breaks symmetry along the left-right axis of the early embryo by producing and sensing directed ciliary flow as a patterning cue. To carry out this process, the LRO contains different ciliated cell types that vary in cilia length, whether they are motile or sensory, and how they position their cilia along the anterior-posterior (A-P) planar axis. Here, we show that these different cilia features are specified in the prospective LRO during gastrulation, based on anisotropic mechanical strain that is oriented along the A-P axis, and graded in levels along the medial-lateral axis...
May 7, 2018: Developmental Cell
Soon-Ki Han, Xingyun Qi, Kei Sugihara, Jonathan H Dang, Takaho A Endo, Kristen L Miller, Eun-Deok Kim, Takashi Miura, Keiko U Torii
Precise cell division control is critical for developmental patterning. For the differentiation of a functional stoma, a cellular valve for efficient gas exchange, the single symmetric division of an immediate precursor is absolutely essential. Yet, the mechanism governing this event remains unclear. Here we report comprehensive inventories of gene expression by the Arabidopsis bHLH protein MUTE, a potent inducer of stomatal differentiation. MUTE switches the gene expression program initiated by SPEECHLESS...
May 7, 2018: Developmental Cell
Brian W Wong, Annalisa Zecchin, Melissa García-Caballero, Peter Carmeliet
The lymphatic system has been less well characterized than the blood vascular system; however, work in recent years has uncovered novel regulators and non-venous lineages that contribute to lymphatic formation in various organs. Further, the identification of organ-specific lymphatic beds underscores their potential interaction with organ development and function, and highlights the possibility of targeting these organ-specific lymphatics beds in disease. This review focuses on newly described metabolic and epigenetic regulators of lymphangiogenesis and the interplay between lymphatic development and function in a number of major organ systems...
May 7, 2018: Developmental Cell
Pedro Monteiro, Susana A Godinho
Structural centrosomal aberrations have long been described in cancer, but their impact on cell physiology and tumorigenesis remains unclear. Ganier et al. (2018) show that centrosome structural abnormalities facilitate cell dissemination by promoting budding of epithelial mitotic cells.
May 7, 2018: Developmental Cell
Jennifer M Gilbert, Barak Blum
Immature β cells secrete insulin at a lower glucose threshold compared to mature β cells. In this issue of Developmental Cell, Huang et al. (2018) show that the increase in glucose threshold during β cell maturation is achieved through balance between the Ca2+ -sensitive synaptotagmin 7 and the Ca2+ -insensitive synaptotagmin 4.
May 7, 2018: Developmental Cell
Jorge Zamora-Zaragoza, Ben Scheres
Precise coordination of cell differentiation and division within a tissue context is critical for plant development. In this issue of Developmental Cell, Han et al. (2018) report a transcriptional switch that ensures proper patterning, the final cell division, and terminal differentiation of stomata.
May 7, 2018: Developmental Cell
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