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JOURNAL ARTICLE
H Katherine Johnson, Stacey E Wahl, Fatmata Sesay, Larisa Litovchick, Amanda Jg Dickinson
Loss of function variations in the dual specificity tyrosine-phosphorylation-regulated kinase 1A (DYRK1A) gene are associated with craniofacial malformations in humans. Here we characterized the effects of deficient DYRK1A in craniofacial development using a developmental model, Xenopus laevis. Dyrk1a mRNA and protein were expressed throughout the developing head and both were enriched in the branchial arches which contribute to the face and jaw. Consistently, reduced Dyrk1a function, using dyrk1a morpholinos and pharmacological inhibitors, resulted in orofacial malformations including hypotelorism, altered mouth shape, slanted eyes, and narrower face accompanied by smaller jaw cartilage and muscle...
April 13, 2024: Developmental Biology
#2
JOURNAL ARTICLE
Ricky J Milne, Katherine E Dibley, Jayakumar Bose, Adnan Riaz, Jianping Zhang, Wendelin Schnippenkoetter, Anthony R Ashton, Peter R Ryan, Stephen D Tyerman, Evans S Lagudah
Partial resistance to multiple biotrophic fungal pathogens in wheat (Triticum aestivum L.) is conferred by a variant of the Lr67 gene, which encodes a hexose-proton symporter. Two mutations (G144R, V387L) differentiate the resistant and susceptible protein variants (Lr67res and Lr67sus). Lr67res lacks sugar transport capability and was associated with anion transporter-like properties when expressed in Xenopus laevis oocytes. Here, we extended this functional characterization to include yeast and in planta studies...
April 15, 2024: Journal of Experimental Botany
#3
JOURNAL ARTICLE
Kseniya Petrova, Maksym Tretiakov, Aleksandr Kotov, Anne H Monsoro-Burq, Leonid Peshkin
This paper introduces a single-cell atlas for pivotal developmental stages in Xenopus, encompassing gastrulation, neurulation, and early tailbud. Notably surpassing its predecessors, the new atlas enhances gene mapping, read counts, and gene/cell type nomenclature. Leveraging the latest Xenopus tropicalis genome version, alongside advanced alignment pipelines and machine learning for cell type assignment, this release maintains consistency with previous cell type annotations while rectifying nomenclature issues...
April 11, 2024: Developmental Biology
#4
JOURNAL ARTICLE
David Du Pasquier, Benoît Salinier, Katherine K Coady, Alan Jones, Oliver Körner, Jessica LaRocca, Gregory Lemkine, Barbara Robin-Duchesne, Lennart Weltje, James R Wheeler, Laurent Lagadic
The Xenopus Eleutheroembryonic Thyroid Assay (XETA) was recently published as an OECD Test Guideline for detecting chemicals acting on the thyroid axis. However, the OECD validation did not cover all mechanisms that can potentially be detected by the XETA. This study was therefore initiated to investigate and consolidate the applicability domain of the XETA regarding the following mechanisms: thyroid hormone receptor (THR) agonism, sodium-iodide symporter (NIS) inhibition, thyroperoxidase (TPO) inhibition, deiodinase (DIO) inhibition, glucocorticoid receptor (GR) agonism, and uridine 5'-diphospho-glucuronosyltransferase (UDPGT) induction...
April 11, 2024: Regulatory Toxicology and Pharmacology: RTP
#5
JOURNAL ARTICLE
Antonella Reyer, Nadia Bazihizina, Justyna Jaślan, Sönke Scherzer, Nadine Schäfer, Dawid Jaślan, Dirk Becker, Thomas D Müller, Benjamin Pommerrenig, H Ekkehard Neuhaus, Irene Marten, Rainer Hedrich
Sugar beet (Beta vulgaris) is the major sugar-producing crop in Europe and Northern America, as the taproot stores sucrose at a concentration of around 20%. Genome sequence analysis together with biochemical and electrophysiological approaches led to the identification and characterization of the TST sucrose transporter driving vacuolar sugar accumulation in the taproot. However, the sugar transporters mediating sucrose uptake across the plasma membrane of taproot parenchyma cells remained unknown. As with glucose, sucrose stimulation of taproot parenchyma cells caused inward proton fluxes and plasma membrane depolarization, indicating a sugar/proton symport mechanism...
April 11, 2024: Plant Journal
#6
JOURNAL ARTICLE
Bram Ja Vermeulen, Anna Böhler, Qi Gao, Annett Neuner, Erik Župa, Zhenzhen Chu, Martin Würtz, Ursula Jäkle, Oliver J Gruss, Stefan Pfeffer, Elmar Schiebel
The γ-tubulin ring complex (γ-TuRC) is a structural template for de novo microtubule assembly from α/β-tubulin units. The isolated vertebrate γ-TuRC assumes an asymmetric, open structure deviating from microtubule geometry, suggesting that γ-TuRC closure may underlie regulation of microtubule nucleation. Here, we isolate native γ-TuRC-capped microtubules from Xenopus laevis egg extract nucleated through the RanGTP-induced pathway for spindle assembly and determine their cryo-EM structure...
April 10, 2024: EMBO Journal
#7
REVIEW
Devesh Bahety, Elvan Böke, Aida Rodríguez-Nuevo
Mitochondria have a crucial role in cellular function and exhibit remarkable plasticity, adjusting both their structure and activity to meet the changing energy demands of a cell. Oocytes, female germ cells that become eggs, undergo unique transformations: the extended dormancy period, followed by substantial increase in cell size and subsequent maturation involving the segregation of genetic material for the next generation, present distinct metabolic challenges necessitating varied mitochondrial adaptations...
April 9, 2024: Trends in Endocrinology and Metabolism: TEM
#8
JOURNAL ARTICLE
Mitsugu Maéno, Miki Tanabe, Ayame Ogawa, Haruka Kobayashi, Yumi Izutsu, Takashi Kato
In the present study, using transgenic frogs that express GFP specifically in myeloid cells under the myeloperoxidase enhancer sequence, we found that myeloperoxidase-positive cells are localized in the liver cortex at the late tadpole stages. Immunohistochemical analysis revealed that myelopoiesis in the liver cortex became evident after st. 50 and reached its peak by st. 56. Transplantation experiments indicated that cells with a high density at the liver cortex were derived from the dorso-lateral plate tissue in the neurula embryo...
April 8, 2024: Developmental and Comparative Immunology
#9
Dmytro Isaev, Keun-Hang Susan Yang, Murat Oz
OBJECTIVE: Naringenin, a major flavonoid found in citrus juice, has been shown to inhibit HERG channels and cause QT prolongation. Statins, the most commonly used class of cholesterol reducing drugs, have also been reported to inhibit HERG channels and prolong QT interval in patients using these drugs. However, the interaction between naringenin and statins on the function of HERG channels has not been studied. MATERIALS AND METHODS: In the present study, we expressed HERG channels in Xenopus oocytes and tested the effects of naringenin and statins separately and combined on HERG channels...
April 9, 2024: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
#10
JOURNAL ARTICLE
Toki Kaneshima, Masaki Ogawa, Takayoshi Yamamoto, Yosuke Tsuboyama, Yuki Miyata, Takahiro Kotani, Takaharu Okajima, Tatsuo Michiue
In vertebrate development, ectoderm is specified into neural plate (NP), neural plate border (NPB), and epidermis. Although such patterning is thought to be achieved by molecular concentration gradients, it has been revealed, mainly by in vitro analysis, that mechanical force can regulate cell specification. During in vivo patterning, cells deform and migrate, and this applies force to surrounding tissues, shaping the embryo. However, the role of mechanical force for cell specification in vivo is largely unknown...
2024: International Journal of Developmental Biology
#11
JOURNAL ARTICLE
J Guillermo Sanchez, Scott Rankin, Emily Paul, Heather A McCauley, Daniel O Kechele, Jacob R Enriquez, Nana-Hawa Jones, Siri A W Greeley, Lisa Letourneau-Friedberg, Aaron M Zorn, Mansa Krishnamurthy, James M Wells
The gastrointestinal tract is complex and consists of multiple organs with unique functions. Rare gene mutations can cause congenital malformations of the human GI tract, although the molecular basis of these has been poorly studied. We identified a patient with compound-heterozygous mutations in RFX6 presenting with duodenal mal-rotation and atresia, implicating RFX6 in development of the proximal intestine. To identify how mutations in RFX6 impact intestinal patterning and function, we derived iPSCs from this patient to generate human intestinal organoids (HIOs)...
April 8, 2024: Development
#12
JOURNAL ARTICLE
Qianqian Pan, Tianxing Lv, Haorong Xu, Hongda Fang, Meng Li, Jiaping Zhu, Yue Wang, Xiaoyan Fan, Ping Xu, Xiuguo Wang, Qiangwei Wang, Haruna Matsumoto, Mengcen Wang
Emerging evidence suggests a link between alterations in the gut microbiome and adverse health outcomes in the hosts exposed to environmental pollutants. Yet, the causal relationships and underlying mechanisms remain largely undefined. Here we show that exposure to biotoxins can affect gut pathobiome assembly in amphibians, which in turn triggers the toxicity of exogenous pollutants. We used Xenopus laevis as a model in this study. Tadpoles exposed to tropolone demonstrated notable developmental impairments and increased locomotor activity, with a reduction in total length by 4...
September 2024: Environ Sci Ecotechnol
#13
JOURNAL ARTICLE
Ikuko Hongo, Chihiro Yamaguchi, Harumasa Okamoto
Increased brain size and its rostral bias are hallmarks of vertebrate evolution, but the underlying developmental and genetic basis remains poorly understood. To provide clues to understanding vertebrate brain evolution, we investigated the developmental mechanisms of brain enlargement observed in the offspring of a previously unrecognized, spontaneously occurring female variant line of Xenopus that appears to reflect a genetic variation. Brain enlargement in larvae from this line showed a pronounced rostral bias that could be traced back to the neural plate, the primordium of the brain...
April 2, 2024: Cells & development
#14
JOURNAL ARTICLE
Aitana M Castro Colabianchi, Nicolás G González Pérez, Lucía F Franchini, Silvia L López
The establishment of the embryonic dorsoventral axis in Xenopus occurs when the radial symmetry around the egg's animal-vegetal axis is broken to give rise to the typical symmetry of Bilaterians. We have previously shown that the Notch1 protein is ventrally enriched during early embryogenesis in Xenopus laevis and zebrafish and exerts ventralizing activity through β-Catenin destabilization and the positive regulation of ventral center genes in X. laevis . These findings led us to further investigate when these asymmetries arise...
2024: Frontiers in Cell and Developmental Biology
#15
JOURNAL ARTICLE
Benjamin M Lorton, Christopher Warren, Humaira Ilyas, Prithviraj Nandigrami, Subray Hegde, Sean Cahill, Stephanie M Lehman, Jeffrey Shabanowitz, Donald F Hunt, Andras Fiser, David Cowburn, David Shechter
Histone chaperones-structurally diverse, non-catalytic proteins enriched with acidic intrinsically disordered regions (IDRs)-protect histones from spurious nucleic acid interactions and guide their deposition into and out of nucleosomes. Despite their conservation and ubiquity, the function of the chaperone acidic IDRs remains unclear. Here, we show that the Xenopus laevis Npm2 and Nap1 acidic IDRs are substrates for TTLL4 (Tubulin Tyrosine Ligase Like 4)-catalyzed post-translational glutamate-glutamylation...
April 19, 2024: IScience
#16
JOURNAL ARTICLE
Fabien Sourisseau, Chaimaa Chahine, Valérie Pouliot, Thierry Cens, Pierre Charnet, Mohamed Chahine
Potassium channels belong to the super family of ion channels and play a fundamental role in cell excitability. Kir channels are potassium channels with an inwardly rectifying property. They play a role in setting the resting membrane potential of many excitable cells including neurons. Although putative Kir channel family genes can be found in the Apis mellifera genome, their functional expression, biophysical properties, and sensitivity to small molecules with insecticidal activity remain to be investigated...
April 3, 2024: Scientific Reports
#17
JOURNAL ARTICLE
Laura Padayachy, Sotirios G Ntallis, Thanos D Halazonetis
Human RECQL4, a member of the RecQ helicase family, plays a role in maintaining genomic stability, but its precise function remains unclear. The N-terminus of RECQL4 has similarity to Sld2, a protein required for the firing of DNA replication origins in budding yeast. Consistent with this sequence similarity, the Xenopus laevis homolog of RECQL4 has been implicated in initiating DNA replication in egg extracts. To determine whether human RECQL4 is required for firing of DNA replication origins, we generated cells in which both RECQL4 alleles were targeted, resulting in either lack of protein expression (knock-out; KO) or expression of a full-length, mutant protein lacking helicase activity (helicase-dead; HD)...
April 2, 2024: Scientific Reports
#18
Clara Houdayer, A Marie Phillips, Marie Chabbert, Jennifer Bourreau, Reza Maroofian, Henry Houlden, Kay Richards, Nebal Waill Saadi, Eliška Dad'ová, Patrick Van Bogaert, Mailys Rupin, Boris Keren, Perrine Charles, Thomas Smol, Audrey Riquet, Lynn Pais, Anne O'Donnell-Luria, Grace E VanNoy, Allan Bayat, Rikke S Møller, Kern Olofsson, Rami Abou Jamra, Steffen Syrbe, Majed Dasouki, Laurie H Seaver, Jennifer A Sullivan, Vandana Shashi, Fowzan S Alkuraya, Alexis F Poss, J Edward Spence, Rhonda E Schnur, Ian C Forster, Chaseley E Mckenzie, Cas Simons, Min Wang, Penny Snell, Kavitha Kothur, Michael Buckley, Tony Roscioli, Noha Elserafy, Benjamin Dauriat, Vincent Procaccio, Daniel Henrion, Guy Lenaers, Estelle Colin, Nienke E Verbeek, Koen L Van Gassen, Claire Legendre, Dominique Bonneau, Christopher A Reid, Katherine B Howell, Alban Ziegler, Christian Legros
Hyperpolarization activated Cyclic Nucleotide (HCN) gated channels are crucial for various neurophysiological functions, including learning and sensory functions, and their dysfunction are responsible for brain disorders, such as epilepsy. To date, HCN2 variants have only been associated with mild epilepsy and recently, one monoallelic missense variant has been linked to developmental and epileptic encephalopathy. Here, we expand the phenotypic spectrum of HCN2- related disorders by describing twenty-one additional individuals from fifteen unrelated families carrying HCN2 variants...
March 22, 2024: medRxiv
#19
JOURNAL ARTICLE
Sigmund J Degitz, Philip P Degoey, Jonathan T Haselman, Jennifer H Olker, Emma H Stacy, Chad Blanksma, Scott Meyer, Kali Z Mattingly, Brett Blackwell, Anne S Opseth, Michael W Hornung
As part of the US Environmental Protection Agency's perfluoroalkyl and polyfluoroalkyl substances (PFAS) Action Plan, the agency is committed to increasing our understanding of the potential ecological effects of PFAS. The objective of these studies was to examine the developmental toxicity of PFAS using the laboratory model amphibian species Xenopus laevis. We had two primary aims: (1) to understand the developmental toxicity of a structurally diverse set of PFAS compounds in developing embryos and (2) to characterize the potential impacts of perfluorooctanesulfonic acid (PFOS), perfluorohexanesulfonic acid (PFHxS), perfluorooctanoic acid (PFOA), and hexafluoropropylene oxide-dimer acid (HFPO-DA a...
March 26, 2024: Journal of Applied Toxicology: JAT
#20
JOURNAL ARTICLE
Alicia Tribondeau, David Du Pasquier, Médine Benchouaia, Corinne Blugeon, Nicolas Buisine, Laurent M Sachs
Thyroid hormones are involved in many biological processes such as neurogenesis, metabolism, and development. However, compounds called endocrine disruptors can alter thyroid hormone signaling and induce unwanted effects on human and ecosystems health. Regulatory tests have been developed to detect these compounds but need to be significantly improved by proposing novel endpoints and key events. The Xenopus Eleutheroembryonic Thyroid Assay (XETA, OECD test guideline no. 248) is one such test. It is based on Xenopus laevis tadpoles, a particularly sensitive model system for studying the physiology and disruption of thyroid hormone signaling: amphibian metamorphosis is a spectacular (thus easy to monitor) life cycle transition governed by thyroid hormones...
2024: Frontiers in Endocrinology
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