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https://www.readbyqxmd.com/read/29562167/oncogenic-idh1-mutations-promote-enhanced-proline-synthesis-through-pycr1-to-support-the-maintenance-of-mitochondrial-redox-homeostasis
#1
Kate E R Hollinshead, Haydn Munford, Katherine L Eales, Chiara Bardella, Chunjie Li, Cristina Escribano-Gonzalez, Alpesh Thakker, Yannic Nonnenmacher, Katarina Kluckova, Mark Jeeves, Robert Murren, Federica Cuozzo, Dan Ye, Giulio Laurenti, Wei Zhu, Karsten Hiller, David J Hodson, Wei Hua, Ian P Tomlinson, Christian Ludwig, Ying Mao, Daniel A Tennant
Since the discovery of mutations in isocitrate dehydrogenase 1 (IDH1) in gliomas and other tumors, significant efforts have been made to gain a deeper understanding of the consequences of this oncogenic mutation. One aspect of the neomorphic function of the IDH1 R132H enzyme that has received less attention is the perturbation of cellular redox homeostasis. Here, we describe a biosynthetic pathway exhibited by cells expressing mutant IDH1. By virtue of a change in cellular redox homeostasis, IDH1-mutated cells synthesize excess glutamine-derived proline through enhanced activity of pyrroline 5-carboxylate reductase 1 (PYCR1), coupled to NADH oxidation...
March 20, 2018: Cell Reports
https://www.readbyqxmd.com/read/29555751/diversification-of-aid-apobec-like-deaminases-in-metazoa-multiplicity-of-clades-and-widespread-roles-in-immunity
#2
Arunkumar Krishnan, Lakshminarayan M Iyer, Stephen J Holland, Thomas Boehm, L Aravind
AID/APOBEC deaminases (AADs) convert cytidine to uridine in single-stranded nucleic acids. They are involved in numerous mutagenic processes, including those underpinning vertebrate innate and adaptive immunity. Using a multipronged sequence analysis strategy, we uncover several AADs across metazoa, dictyosteliida, and algae, including multiple previously unreported vertebrate clades, and versions from urochordates, nematodes, echinoderms, arthropods, lophotrochozoans, cnidarians, and porifera. Evolutionary analysis suggests a fundamental division of AADs early in metazoan evolution into secreted deaminases (SNADs) and classical AADs, followed by diversification into several clades driven by rapid-sequence evolution, gene loss, lineage-specific expansions, and lateral transfer to various algae...
March 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29543066/the-role-of-idh-mutations-in-acute-myeloid-leukemia
#3
Guillermo Montalban-Bravo, Courtney D DiNardo
Isocitrate dehydrogenases (IDHs) are enzymes involved in multiple metabolic and epigenetic cellular processes. Mutations in IDH1 or IDH2 are detected in approximately 20% of patients with acute myeloid leukemia (AML) and induce amino acid changes in conserved residues resulting in neomorphic enzymatic function and production of an oncometabolite, 2-hydroxyglutarate (R-2-HG). This leads to DNA hypermethylation, aberrant gene expression, cell proliferation and abnormal differentiation. IDH mutations diversely affect prognosis of patients with AML based on the location of the mutation and other co-occurring genomic abnormalities...
March 15, 2018: Future Oncology
https://www.readbyqxmd.com/read/29520219/plexin-semaphorin-signaling-modifies-neuromuscular-defects-in-a-drosophila-model-of-peripheral-neuropathy
#4
Stuart J Grice, James N Sleigh, M Zameel Cader
Dominant mutations in GARS , encoding the ubiquitous enzyme glycyl-tRNA synthetase (GlyRS), cause peripheral nerve degeneration and Charcot-Marie-Tooth disease type 2D (CMT2D). This genetic disorder exemplifies a recurring paradigm in neurodegeneration, in which mutations in essential genes cause selective degeneration of the nervous system. Recent evidence suggests that the mechanism underlying CMT2D involves extracellular neomorphic binding of mutant GlyRS to neuronally-expressed proteins. Consistent with this, our previous studies indicate a non-cell autonomous mechanism, whereby mutant GlyRS is secreted and interacts with the neuromuscular junction (NMJ)...
2018: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/29458964/metabolism-activity-and-targeting-of-d-and-l-2-hydroxyglutarates
#5
REVIEW
Dan Ye, Kun-Liang Guan, Yue Xiong
Isocitrate dehydrogenases (IDH1/2) are frequently mutated in multiple types of human cancer, resulting in neomorphic enzymes that convert α-ketoglutarate (α-KG) to 2-hydroxyglutarate (2-HG). The current view on the mechanism of IDH mutation holds that 2-HG acts as an antagonist of α-KG to competitively inhibit the activity of α-KG-dependent dioxygenases, including those involved in histone and DNA demethylation. Recent studies have implicated 2-HG in activities beyond epigenetic modification. Multiple enzymes have been discovered that lack mutations but that can nevertheless produce 2-HG promiscuously under hypoxic or acidic conditions...
February 2018: Trends in Cancer
https://www.readbyqxmd.com/read/29447907/wilhelm-his-lasting-insights-into-hindbrain-and-cranial-ganglia-development-and-evolution
#6
REVIEW
Joel C Glover, Karen L Elliott, Albert Erives, Victor V Chizhikov, Bernd Fritzsch
Wilhelm His (1831-1904) provided lasting insights into the development of the central and peripheral nervous system using innovative technologies such as the microtome, which he invented. 150 years after his resurrection of the classical germ layer theory of Wolff, von Baer and Remak, his description of the developmental origin of cranial and spinal ganglia from a distinct cell population, now known as the neural crest, has stood the test of time and more recently sparked tremendous advances regarding the molecular development of these important cells...
February 12, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29438688/neomorphic-er%C3%AE-mutations-drive-progression-in-breast-cancer-and-present-a-challenge-for-new-drug-discovery
#7
Donald P McDonnell, John D Norris, Ching-Yi Chang
In this issue of Cancer Cell, Jeselsohn et al. dissect the function of several of the most clinically important estrogen receptor alpha mutants associated with endocrine therapy resistance in breast cancer and demonstrate that they manifest disease-relevant neomorphic activities that likely contribute to tumor pathogenesis.
February 12, 2018: Cancer Cell
https://www.readbyqxmd.com/read/29418120/assessment-of-the-hindlimb-membrane-musculature-of-bats-implications-for-active-control-of-the-calcar
#8
Kathryn E Stanchak, Sharlene E Santana
The striking postcranial anatomy of bats reflects their specialized ecology; they are the only mammals capable of powered flight. Bat postcranial adaptations include a series of membranes that connect highly-modified, or even novel, skeletal elements. While most studies of bat postcranial anatomy have focused on their wings, bat hindlimbs also contain many derived and functionally important, yet less studied, features. In this study, we investigate variation in the membrane and limb musculature associated with the calcar, a neomorphic skeletal structure found in the hindlimbs of most bats...
March 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29351342/a-homozygous-missense-variant-in-vwa2-encoding-an-interactor-of-the-fraser-complex-in-a-patient-with-vesicoureteral-reflux
#9
Amelie T van der Ven, Birgit Kobbe, Stefan Kohl, Shirlee Shril, Hans-Martin Pogoda, Thomas Imhof, Hadas Ityel, Asaf Vivante, Jing Chen, Daw-Yang Hwang, Dervla M Connaughton, Nina Mann, Eugen Widmeier, Mary Taglienti, Johanna Magdalena Schmidt, Makiko Nakayama, Prabha Senguttuvan, Selvin Kumar, Velibor Tasic, Elijah O Kehinde, Shrikant M Mane, Richard P Lifton, Neveen Soliman, Weining Lu, Stuart B Bauer, Matthias Hammerschmidt, Raimund Wagener, Friedhelm Hildebrandt
Congenital anomalies of the kidney and urinary tract (CAKUT) are the most common cause (40-50%) of chronic kidney disease (CKD) in children. About 40 monogenic causes of CAKUT have so far been discovered. To date less than 20% of CAKUT cases can be explained by mutations in these 40 genes. To identify additional monogenic causes of CAKUT, we performed whole exome sequencing (WES) and homozygosity mapping (HM) in a patient with CAKUT from Indian origin and consanguineous descent. We identified a homozygous missense mutation (c...
2018: PloS One
https://www.readbyqxmd.com/read/29323250/a-biofilm-and-organomineralisation-model-for-the-growth-and-limiting-size-of-ooids
#10
Murray T Batchelor, Robert V Burne, Bruce I Henry, Fei Li, Josef Paul
Ooids are typically spherical sediment grains characterised by concentric layers encapsulating a core. There is no universally accepted explanation for ooid genesis, though factors such as agitation, abiotic and/or microbial mineralisation and size limitation have been variously invoked. Here we examine the possible influence of microbial organomineralisation on the formation of some naturally occurring ooids. We develop a mathematical model for ooid growth, inspired by work on avascular brain tumours, that assumes mineralisation in a biofilm to form a central core which then nucleates the progressive growth of concentric laminations...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29184081/allosteric-inhibitor-remotely-modulates-the-conformation-of-the-orthestric-pockets-in-mutant-idh2-r140q
#11
Jiao Chen, Jie Yang, Xianqiang Sun, Zhongming Wang, Xiaolan Cheng, Wuguang Lu, Xueting Cai, Chunping Hu, Xu Shen, Peng Cao
Neomorphic mutation R140Q in the metabolic enzyme isocitrate dehydrogenase 2 (IDH2) is found to be a driver mutation in cancers. Recent studies revealed that allosteric inhibitors could selectively inhibit IDH2/R140Q and induce differentiation of TF-1 erythroleukemia and primary human AML cells. However, the allosteric inhibition mechanism is not very clear. Here, we report the results from computational studies that AGI-6780 binds tightly with the divalent cation binding helices at the homodimer interface and prevents the transition of IDH2/R140Q homodimer to a closed conformation that is required for catalysis, resulting in the decrease of the binding free energy of NADPHs...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29174564/crispr-cas9-engineered-osteogenesis-imperfecta-type-v-leads-to-severe-skeletal-deformities-and-perinatal-lethality-in-mice
#12
Frank Rauch, Yeqing Geng, Lisa Lamplugh, Bahareh Hekmatnejad, Marie-Hélène Gaumond, Janice Penney, Yojiro Yamanaka, Pierre Moffatt
Osteogenesis imperfecta (OI) type V is caused by an autosomal dominant mutation in the IFITM5 gene, also known as BRIL. The c.-14C>T mutation in the 5'UTR of BRIL creates a novel translational start site adding 5 residues (MALEP) in frame with the natural coding of BRIL. A neomorphic function has been proposed for the MALEP-BRIL but the mechanisms at play are still unknown. In order to further understand the effects of MALEP-BRIL in vivo, we generated a knockin (KI) mouse model having the exact genetic -14C>T replica of patients with OI type V...
February 2018: Bone
https://www.readbyqxmd.com/read/29097607/adaptive-evolution-of-the-gdh2-allosteric-domain-promotes-gliomagenesis-by-resolving-idh1-r132h-induced-metabolic-liabilities
#13
Matthew S Waitkus, Christopher J Pirozzi, Casey J Moure, Bill H Diplas, Landon J Hansen, Austin B Carpenter, Rui Yang, Zhaohui Wang, Brian O Ingram, Edward D Karoly, Robert P Mohney, Ivan Spasojeic, Roger E McLendon, Henry S Friedman, Yiping He, Darell D Bigner, Hai Yan
Hot-spot mutations in the isocitrate dehydrogenase 1 (IDH1) gene occur in a number of human cancers and confer a neomorphic enzyme activity that catalyzes the conversion of α-ketoglutarate (αKG) to the oncometabolite D-(2)-hydroxyglutarate (D2HG). In malignant gliomas, IDH1(R132H) expression induces widespread metabolic reprogramming, possibly requiring compensatory mechanisms to sustain the normal biosynthetic requirements of actively proliferating tumor cells. We used genetically engineered mouse models of glioma and quantitative metabolomics to investigate IDH1(R132H)-dependent metabolic reprogramming and its potential to induce biosynthetic liabilities that can be exploited for glioma therapy...
November 2, 2017: Cancer Research
https://www.readbyqxmd.com/read/29091765/low-grade-astrocytoma-mutations-in-idh1-p53-and-atrx-cooperate-to-block-differentiation-of-human-neural-stem-cells-via-repression-of-sox2
#14
Aram S Modrek, Danielle Golub, Themasap Khan, Devin Bready, Jod Prado, Christopher Bowman, Jingjing Deng, Guoan Zhang, Pedro P Rocha, Ramya Raviram, Charalampos Lazaris, James M Stafford, Gary LeRoy, Michael Kader, Joravar Dhaliwal, N Sumru Bayin, Joshua D Frenster, Jonathan Serrano, Luis Chiriboga, Rabaa Baitalmal, Gouri Nanjangud, Andrew S Chi, John G Golfinos, Jing Wang, Matthias A Karajannis, Richard A Bonneau, Danny Reinberg, Aristotelis Tsirigos, David Zagzag, Matija Snuderl, Jane A Skok, Thomas A Neubert, Dimitris G Placantonakis
Low-grade astrocytomas (LGAs) carry neomorphic mutations in isocitrate dehydrogenase (IDH) concurrently with P53 and ATRX loss. To model LGA formation, we introduced R132H IDH1, P53 shRNA, and ATRX shRNA into human neural stem cells (NSCs). These oncogenic hits blocked NSC differentiation, increased invasiveness in vivo, and led to a DNA methylation and transcriptional profile resembling IDH1 mutant human LGAs. The differentiation block was caused by transcriptional silencing of the transcription factor SOX2 secondary to disassociation of its promoter from a putative enhancer...
October 31, 2017: Cell Reports
https://www.readbyqxmd.com/read/29090344/the-role-of-mutant-idh1-and-idh2-inhibitors-in-the-treatment-of-acute-myeloid-leukemia
#15
REVIEW
Samah Nassereddine, Coen J Lap, Faysal Haroun, Imad Tabbara
For decades, researchers have looked into the pathophysiology of acute myeloid leukemia (AML). With the advances in molecular techniques, the two-hit hypothesis was replaced by a multi-hit model, which also emphasizes the importance of aberrant epigenetic regulation in the pathogenesis of AML. IDH1 and IDH2 are two isoforms of isocitrate dehydrogenase that perform crucial roles in cellular metabolism. Somatic mutations in either of these two genes impart a neomorphic enzymatic activity upon the encoded enzymes resulting in the ability to convert α-ketoglutarate (αKG) into the oncometabolite R2-hydroxyglutarate (R2-HG), which can competitively inhibit multiple αKG-dependent dioxygenases...
December 2017: Annals of Hematology
https://www.readbyqxmd.com/read/29044203/neomorphosis-and-heterochrony-of-skull-shape-in-dog-domestication
#16
Madeleine Geiger, Allowen Evin, Marcelo R Sánchez-Villagra, Dominic Gascho, Cornelia Mainini, Christoph P E Zollikofer
The overall similarity of the skull shape of some dog breeds with that of juvenile wolves begs the question if and how ontogenetic changes such as paedomorphosis (evolutionary juvenilisation) played a role in domestication. Here we test for changes in patterns of development and growth during dog domestication. We present the first geometric morphometric study using ontogenetic series of dog and wolf crania, and samples of dogs with relatively ancestral morphology and from different time periods. We show that patterns of juvenile-to-adult morphological change are largely similar in wolves and domestic dogs, but differ in two ways...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29025583/a-rare-case-of-pediatric-lipoma-with-t-9-12-p22-q14-and-evidence-of-hmga2-nfib-gene-fusion
#17
Melanie Lacaria, Dina El Demellawy, Jean McGowan-Jordan
Lipoma is a benign tumor, typically of adulthood, with characteristic cytogenetic findings, including rearrangement of 12q13-15; these rearrangements often lead to the fusion of the HMGA2 gene at this locus to the transcriptional regulatory domain of its fusion partner, resulting in neomorphic activity that presumably facilitates the neoplastic process. Herein, we report a rare case of pediatric lipoma with t(9;12)(p22;q14) and evidence of HMGA2-NFIB gene fusion in a 9 year-old boy. This case provides further evidence of the link between NFIB rearrangement and early-onset, deep-seated lipomatous tumors...
October 2017: Cancer Genetics
https://www.readbyqxmd.com/read/28931065/chlamydomonas-fap265-is-a-tubulin-polymerization-promoting-protein-essential-for-flagellar-reassembly-and-hatching-of-daughter-cells-from-the-sporangium
#18
Damayanti Tammana, Trinadh Venkata Satish Tammana
Tubulin polymerization promoting proteins (TPPPs) belong to a family of neomorphic moon lighting proteins, involved in various physiological and pathological conditions. In physiological conditions, TPPPs play an important role in microtubule dynamics regulating mitotic spindle assembly and in turn cell proliferation. In pathological situations, TPPPs interact with α-synuclein and β-amyloid and promote their aggregation leading to Parkinson's disease and multiple system atrophy. Orthologs of TPPP family proteins were identified in ciliary proteomes from various organisms including Chlamydomonas but their role in ciliogenesis was not known...
2017: PloS One
https://www.readbyqxmd.com/read/28855157/-h3-k27m-i-mutations-promote-context-dependent-transformation-in-acute-myeloid-leukemia-with-runx1-alterations
#19
Bernhard Lehnertz, Yu Wei Zhang, Isabel Boivin, Nadine Mayotte, Elisa Tomellini, Jalila Chagraoui, Vincent-Philippe Lavallée, Josée Hébert, Guy Sauvageau
Neomorphic missense mutations affecting crucial lysine residues in histone H3 genes significantly contribute to a variety of solid cancers. Despite the high prevalence of H3 K27M mutations in pediatric glioblastoma and their well-established impact on global histone H3 lysine 27 di- and trimethylation (H3K27me2/3), the relevance of these mutations has not been studied in acute myeloid leukemia (AML). Here, we report the first identification of H3 K27M and H3 K27I mutations in patients with AML. We find that these lesions are major determinants of reduced H3K27me2/3 in these patients and that they are associated with common aberrations in the RUNX1 gene...
November 16, 2017: Blood
https://www.readbyqxmd.com/read/28844694/cancer-specific-retargeting-of-baf-complexes-by-a-prion-like-domain
#20
Gaylor Boulay, Gabriel J Sandoval, Nicolo Riggi, Sowmya Iyer, Rémi Buisson, Beverly Naigles, Mary E Awad, Shruthi Rengarajan, Angela Volorio, Matthew J McBride, Liliane C Broye, Lee Zou, Ivan Stamenkovic, Cigall Kadoch, Miguel N Rivera
Alterations in transcriptional regulators can orchestrate oncogenic gene expression programs in cancer. Here, we show that the BRG1/BRM-associated factor (BAF) chromatin remodeling complex, which is mutated in over 20% of human tumors, interacts with EWSR1, a member of a family of proteins with prion-like domains (PrLD) that are frequent partners in oncogenic fusions with transcription factors. In Ewing sarcoma, we find that the BAF complex is recruited by the EWS-FLI1 fusion protein to tumor-specific enhancers and contributes to target gene activation...
September 21, 2017: Cell
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