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https://www.readbyqxmd.com/read/28284839/depletion-of-tumor-suppressor-kank1-induces-centrosomal-amplification-via-hyperactivation-of-rhoa
#1
Jun-Ichiro Suzuki, Badal Chandra Roy, Takunori Ogaeri, Naoto Kakinuma, Ryoiti Kiyama
Chromosome instability, frequently found in cancer cells, is caused by a deficiency in cell division, including centrosomal amplification and cytokinesis failure, and can result in abnormal chromosome content or aneuploidy. The small GTPase pathways have been implicated as important processes in cell division. We found that knockdown of a tumor suppressor protein Kank1 increases the number of cells with a micronucleus or bi-/multi-nuclei, which was likely caused by centrosomal amplification. Kank1 interacts with Daam1, known to bind to and activate a small GTPase, RhoA, in actin assembly...
March 8, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28263302/whole-genome-sequencing-resource-identifies-18-new-candidate-genes-for-autism-spectrum-disorder
#2
Ryan K C Yuen, Daniele Merico, Matt Bookman, Jennifer L Howe, Bhooma Thiruvahindrapuram, Rohan V Patel, Joe Whitney, Nicole Deflaux, Jonathan Bingham, Zhuozhi Wang, Giovanna Pellecchia, Janet A Buchanan, Susan Walker, Christian R Marshall, Mohammed Uddin, Mehdi Zarrei, Eric Deneault, Lia D'Abate, Ada J S Chan, Stephanie Koyanagi, Tara Paton, Sergio L Pereira, Ny Hoang, Worrawat Engchuan, Edward J Higginbotham, Karen Ho, Sylvia Lamoureux, Weili Li, Jeffrey R MacDonald, Thomas Nalpathamkalam, Wilson W L Sung, Fiona J Tsoi, John Wei, Lizhen Xu, Anne-Marie Tasse, Emily Kirby, William Van Etten, Simon Twigger, Wendy Roberts, Irene Drmic, Sanne Jilderda, Bonnie MacKinnon Modi, Barbara Kellam, Michael Szego, Cheryl Cytrynbaum, Rosanna Weksberg, Lonnie Zwaigenbaum, Marc Woodbury-Smith, Jessica Brian, Lili Senman, Alana Iaboni, Krissy Doyle-Thomas, Ann Thompson, Christina Chrysler, Jonathan Leef, Tal Savion-Lemieux, Isabel M Smith, Xudong Liu, Rob Nicolson, Vicki Seifer, Angie Fedele, Edwin H Cook, Stephen Dager, Annette Estes, Louise Gallagher, Beth A Malow, Jeremy R Parr, Sarah J Spence, Jacob Vorstman, Brendan J Frey, James T Robinson, Lisa J Strug, Bridget A Fernandez, Mayada Elsabbagh, Melissa T Carter, Joachim Hallmayer, Bartha M Knoppers, Evdokia Anagnostou, Peter Szatmari, Robert H Ring, David Glazer, Mathew T Pletcher, Stephen W Scherer
We are performing whole-genome sequencing of families with autism spectrum disorder (ASD) to build a resource (MSSNG) for subcategorizing the phenotypes and underlying genetic factors involved. Here we report sequencing of 5,205 samples from families with ASD, accompanied by clinical information, creating a database accessible on a cloud platform and through a controlled-access internet portal. We found an average of 73.8 de novo single nucleotide variants and 12.6 de novo insertions and deletions or copy number variations per ASD subject...
March 6, 2017: Nature Neuroscience
https://www.readbyqxmd.com/read/28255082/pten-regulates-glutamine-flux-to-pyrimidine-synthesis-and-sensitivity-to-dihydroorotate-dehydrogenase-inhibition
#3
Deepti Mathur, Elias Stratikopoulos, Sait Ozturk, Nicole Steinbach, Sarah Pegno, Sarah Schoenfeld, Raymund Yong, Vundavalli V Murty, John M Asara, Lewis C Cantley, Ramon Parsons
Metabolic changes induced by oncogenic drivers of cancer contribute to tumor growth and are attractive targets for cancer treatment. Here, we found that increased growth of PTEN-mutant cells was dependent on glutamine flux through the de novo pyrimidine synthesis pathway, which created sensitivity to the inhibition of dihydroorotate dehydrogenase, a rate-limiting enzyme for pyrimidine ring synthesis. S-phase PTEN-mutant cells showed increased numbers of replication forks, and inhibitors of dihydroorotate dehydrogenase led to chromosome breaks and cell death due to inadequate ATR activation and DNA damage at replication forks...
March 2, 2017: Cancer Discovery
https://www.readbyqxmd.com/read/28254403/the-divisome-at-25-the-road-ahead
#4
REVIEW
Tanneke den Blaauwen, Leendert W Hamoen, Petra Anne Levin
The identification of the FtsZ ring by Bi and Lutkenhaus in 1991 was a defining moment for the field of bacterial cell division. Not only did the presence of the FtsZ ring provide fodder for the next 25 years of research, the application of a then cutting-edge approach-immunogold labeling of bacterial cells-inspired other investigators to apply similarly state-of-the-art technologies in their own work. These efforts have led to important advances in our understanding of the factors underlying assembly and maintenance of the division machinery...
February 27, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/28250910/optimizing-the-microscopy-time-schedule-for-chromosomal-dosimetry-of-high-dose-and-partial-body-irradiations
#5
Volodymyr A Vinnikov
The methodology of cytogenetic triage can be improved by optimizing a schedule of microscopy for different exposure scenarios. Chromosome aberrations were quantified by microscopy in human blood lymphocytes irradiated in vitro to ~2, 4, and 12 Gy acute (60)Co γ-rays mixed with the unirradiated blood simulating 10%, 50%, 90%, and 100% exposure and in along with a sample from a homogeneous exposure to ~20 Gy. Biodosimetry workload was statistically modeled assuming that 0.5, 1, 5, or 25 h was available for scoring one case or for analysis of up to 1000 cells or 100 dicentrics plus centric rings by one operator...
2017: Genome Integrity
https://www.readbyqxmd.com/read/28249098/zapa-and-zapb-form-an-ftsz-independent-structure-at-midcell
#6
Jackson A Buss, Nick T Peters, Jie Xiao, Thomas G Bernhardt
Cell division in Escherichia coli begins with the polymerization of FtsZ into a ring-like structure, the Z-ring, at midcell. All other division proteins are thought to require the Z-ring for recruitment to the future division site. Here, we report that the Z-ring associated proteins ZapA and ZapB form FtsZ-independent structures at midcell. Upon Z-ring disruption by the FtsZ polymerization antagonist SulA, ZapA remained at midcell as a cloud-like accumulation. Using ZapA(N60Y), a variant defective for interaction with FtsZ, it was established that these ZapA structures form without a connection to the Z-ring...
March 1, 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28247607/-assessment-of-hematopoiesis-and-cytogenetics-changes-in-interventional-radiologists
#7
Qihong Zhou, Huijuan Yu, Fengyun Fu, Haipeng Ye
Objective: To investigate hematopoiesis and cytogenetics changes in staff of interventional radiology. Methods: A total of 121 intervention radiation workers, 245 common radiation workers and 100 medical personnel (healthy control) without exposure to radiation were enrolled in the study. The peripheral lymphocyte chromosomal aberrations and micronucleus were detected, and the result of white blood cells examination was analyzed. Results: Compared with common radiation group and healthy control group, decreases in white blood cells count, neutrophil ratio, and increase in lymphocyte ratio were observed in intervention radiation group (all P<0...
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28238653/tuned-smc-arms-drive-chromosomal-loading-of-prokaryotic-condensin
#8
Frank Bürmann, Alrun Basfeld, Roberto Vazquez Nunez, Marie-Laure Diebold-Durand, Larissa Wilhelm, Stephan Gruber
SMC proteins support vital cellular processes in all domains of life by organizing chromosomal DNA. They are composed of ATPase "head" and "hinge" dimerization domains and a connecting coiled-coil "arm." Binding to a kleisin subunit creates a closed tripartite ring, whose ∼47-nm-long SMC arms act as barrier for DNA entrapment. Here, we uncover another, more active function of the bacterial Smc arm. Using high-throughput genetic engineering, we resized the arm in the range of 6-60 nm and found that it was functional only in specific length regimes following a periodic pattern...
March 2, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28236631/causes-of-intrauterine-fetal-death-are-changing-in-recent-years
#9
Hiroko Takita, Junichi Hasegawa, Masamitsu Nakamura, Tatsuya Arakaki, Tomohiro Oba, Ryu Matsuoka, Akihiko Sekizawa
OBJECTIVE: To investigate, how causes of intrauterine fetal death (IUFD) have changed in recent years with the advancement of prenatal diagnosis at a single perinatal center in Japan. METHODS: Medical records were retrospectively reviewed for all cases of IUFDs that occurred between 2001 and 2014. The most commonly associated causes of fetal deaths were compared between 2001-2007 and 2008-2014. RESULTS: The number of IUFD after 20 weeks' gestation/all deliveries in our center was 38/6878 cases (0...
February 25, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28230827/astaxanthin-modifies-clastogenic-effects-of-ionizing-radiation-in-vitro-in-peripheral-blood-lymphocytes-of-the-persons-recovered-from-acute-radiation-sickness
#10
D А Kurinnyi, S R Rushkovsky, O B Dybska, G V Dubrovina, M А Pilinska
AIM: To assess radioprotective activity of astaxanthin toward radiation-induced in vitro cytogenetic effects in human peripheral blood lymphocytes (PBL). MATERIALS AND METHODS: PBL from the cleanup workers exposed to ionizing radiation at high doses in 1986 during accident on Chornobyl nuclear power plant and who were diagnosed with acute radiation sickness of the first and second degrees, were cultured in vitro. Astaxanthin was added into the culture medium at a final concentration of 20...
December 2016: Experimental Oncology
https://www.readbyqxmd.com/read/28220956/releasing-the-cohesin-ring-a-rigid-scaffold-model-for-opening-the-dna-exit-gate-by-pds5-and-wapl
#11
Zhuqing Ouyang, Hongtao Yu
The ring-shaped ATPase machine, cohesin, regulates sister chromatid cohesion, transcription, and DNA repair by topologically entrapping DNA. Here, we propose a rigid scaffold model to explain how the cohesin regulators Pds5 and Wapl release cohesin from chromosomes. Recent studies have established the Smc3-Scc1 interface as the DNA exit gate of cohesin, revealed a requirement for ATP hydrolysis in ring opening, suggested regulation of the cohesin ATPase activity by DNA and Smc3 acetylation, and provided insights into how Pds5 and Wapl open this exit gate...
February 21, 2017: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28210885/cohesin-biology-meets-the-loop-extrusion-model
#12
REVIEW
Christopher Barrington, Ronald Finn, Suzana Hadjur
Extensive research has revealed that cohesin acts as a topological device, trapping chromosomal DNA within a large tripartite ring. In so doing, cohesin contributes to the formation of compact and organized genomes. How exactly the cohesin subunits interact, how it opens, closes, and translocates on chromatin, and how it actually tethers DNA strands together are still being elucidated. A comprehensive understanding of these questions will shed light on how cohesin performs its many functions, including its recently proposed role as a chromatid loop extruder...
February 16, 2017: Chromosome Research
https://www.readbyqxmd.com/read/28207948/right-sided-aortic-arch-in-the-age-of-microarray
#13
Edward F O'Mahony, Darren P Hutchinson, George McGillivray, Debbie L Nisbet, Ricardo Palma-Dias
OBJECTIVE: For fetuses with a diagnosis of right aortic arch and normal cardiac anatomy we aimed to establish the frequency of chromosomal anomaly diagnosed with SNP microarray analysis, particularly focusing on microduplications or microdeletions which would have gone undetected by conventional karyotyping and 6 probe fish (13,18,21, X,Y, TUPLE). METHOD: Retrospective study of fetal ultrasounds between 2011 and 2016 in an Australian tertiary referral centre. Outcomes of interest were survival and postnatal surgery for vascular ring...
February 16, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28202046/highly-predictive-snp-markers-for-efficient-selection-of-the-wheat-leaf-rust-resistance-gene-lr16
#14
Mulualem T Kassa, Frank M You, Colin W Hiebert, Curtis J Pozniak, Pierre R Fobert, Andrew G Sharpe, James G Menzies, D Gavin Humphreys, Nicole Rezac Harrison, John P Fellers, Brent D McCallum, Curt A McCartney
BACKGROUND: Lr16 is a widely deployed leaf rust resistance gene in wheat (Triticum aestivum L.) that is highly effective against the North American Puccinia triticina population when pyramided with the gene Lr34. Lr16 is a seedling leaf rust resistance gene conditioning an incompatible interaction with a distinct necrotic ring surrounding the uredinium. Lr16 was previously mapped to the telomeric region of the short arm of wheat chromosome 2B. The goals of this study were to develop numerous single nucleotide polymorphism (SNP) markers for the Lr16 region and identify diagnostic gene-specific SNP marker assays for marker-assisted selection (MAS)...
February 15, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28191805/ring-chromosome-may-signal-progression-of-fanconi-anemia
#15
Ream Elzain Abdelgadir, Kulthom Mohamed, Imad Fadl Elmula
BACKGROUND: Fanconi anemia (FA) is a genomic instability disorder associated with high risk of AML. Ring chromosomes are results of genomic instability and observed in many human neoplasias. The present study aimed to assess the role of ring chromosome in the progression of FA. MATERIAL AND METHODS: The study included 60 patients with provisional diagnosis of FA. A total of 5 ml of venous blood was collected and processed for complete hemogram, peripheral blood film, and breakage test...
September 2016: Gulf Journal of Oncology
https://www.readbyqxmd.com/read/28178932/variability-among-cucurbitaceae-species-melon-cucumber-and-watermelon-in-a-genomic-region-containing-a-cluster-of-nbs-lrr-genes
#16
Jordi Morata, Pere Puigdomènech
BACKGROUND: Cucurbitaceae species contain a significantly lower number of genes coding for proteins with similarity to plant resistance genes belonging to the NBS-LRR family than other plant species of similar genome size. A large proportion of these genes are organized in clusters that appear to be hotspots of variability. The genomes of the Cucurbitaceae species measured until now are intermediate in size (between 350 and 450 Mb) and they apparently have not undergone any genome duplications beside those at the origin of eudicots...
February 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28177834/cytogenetic-study-and-stripe-rust-response-of-the-derivatives-from-a-wheat-thinopyrum-intermedium-psathyrostachys-huashanica-trigeneric-hybrid
#17
Hou-Yang Kang, Lin Tang, Dai-Yan Li, Cheng-Dou Diao, Wei Zhu, Yao Tang, Yi Wang, Xing Fan, Li-Li Xu, Jian Zeng, Li-Na Sha, Xiao-Fang Yu, Hai-Qin Zhang, Yong-Hong Zhou
To transfer multiple desirable alien genes into common wheat, we previously reported a new trigeneric hybrid synthesized by crossing a wheat - Thinopyrum intermedium partial amphiploid with wheat - Psathyrostachys huashanica amphiploid. Here, the meiotic behavior, chromosome constitution, and stripe rust resistance of F5 derivatives from the wheat - Th. intermedium - P. huashanica trigeneric hybrid were studied. Cytological analysis indicated the F5 progenies had chromosome numbers of 42-50 (average 44.96)...
December 10, 2016: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28162898/sin-dependent-dissociation-of-the-sad-kinase-cdr2-from-the-cell-cortex-resets-the-division-plane
#18
Sergio A Rincon, Miguel Estravis, Florent Dingli, Damarys Loew, Phong T Tran, Anne Paoletti
Proper division plane positioning is crucial for faithful chromosome segregation but also influences cell size, position, or fate [1]. In fission yeast, medial division is controlled through negative signaling by the cell tips during interphase and positive signaling by the centrally placed nucleus at mitotic entry [2-4]: the cell geometry network (CGN), controlled by the inhibitory cortical gradient of the DYRK kinase Pom1 emanating from the cell tips, first promotes the medial localization of cytokinetic ring precursors organized by the SAD kinase Cdr2 to pre-define the division plane [5-8]; then, massive nuclear export of the anillin-like protein Mid1 at mitosis entry confirms or readjusts the division plane according to nuclear position and triggers the assembly of a medial contractile ring [5, 9-11]...
February 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28154080/bacillus-subtilis-smc-complexes-juxtapose-chromosome-arms-as-they-travel-from-origin-to-terminus
#19
Xindan Wang, Hugo B Brandão, Tung B K Le, Michael T Laub, David Z Rudner
Structural maintenance of chromosomes (SMC) complexes play critical roles in chromosome dynamics in virtually all organisms, but how they function remains poorly understood. In the bacterium Bacillus subtilis, SMC-condensin complexes are topologically loaded at centromeric sites adjacent to the replication origin. Here we provide evidence that these ring-shaped assemblies tether the left and right chromosome arms together while traveling from the origin to the terminus (>2 megabases) at rates >50 kilobases per minute...
February 3, 2017: Science
https://www.readbyqxmd.com/read/28137853/binding-sliding-and-function-of-cohesin-during-transcriptional-activation
#20
Melinda S Borrie, John S Campor, Hansa Joshi, Marc R Gartenberg
The ring-shaped cohesin complex orchestrates long-range DNA interactions to mediate sister chromatid cohesion and other aspects of chromosome structure and function. In the yeast Saccharomyces cerevisiae, the complex binds discrete sites along chromosomes, including positions within and around genes. Transcriptional activity redistributes the complex to the 3' ends of convergently oriented gene pairs. Despite the wealth of information about where cohesin binds, little is known about cohesion at individual chromosomal binding sites and how transcription affects cohesion when cohesin complexes redistribute...
February 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
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