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Genome assembly

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https://www.readbyqxmd.com/read/29786699/the-draft-genome-sequence-of-cork-oak
#1
António Marcos Ramos, Ana Usié, Pedro Barbosa, Pedro M Barros, Tiago Capote, Inês Chaves, Fernanda Simões, Isabl Abreu, Isabel Carrasquinho, Carlos Faro, Joana B Guimarães, Diogo Mendonça, Filomena Nóbrega, Leandra Rodrigues, Nelson J M Saibo, Maria Carolina Varela, Conceição Egas, José Matos, Célia M Miguel, M Margarida Oliveira, Cândido P Ricardo, Sónia Gonçalves
Cork oak (Quercus suber) is native to southwest Europe and northwest Africa where it plays a crucial environmental and economical role. To tackle the cork oak production and industrial challenges, advanced research is imperative but dependent on the availability of a sequenced genome. To address this, we produced the first draft version of the cork oak genome. We followed a de novo assembly strategy based on high-throughput sequence data, which generated a draft genome comprising 23,347 scaffolds and 953.3 Mb in size...
May 22, 2018: Scientific Data
https://www.readbyqxmd.com/read/29786079/dissection-of-dna-double-strand-break-repair-using-novel-single-molecule-forceps
#2
Jing L Wang, Camille Duboc, Qian Wu, Takashi Ochi, Shikang Liang, Susan E Tsutakawa, Susan P Lees-Miller, Marc Nadal, John A Tainer, Tom L Blundell, Terence R Strick
Repairing DNA double-strand breaks (DSBs) by nonhomologous end joining (NHEJ) requires multiple proteins to recognize and bind DNA ends, process them for compatibility, and ligate them together. We constructed novel DNA substrates for single-molecule nanomanipulation, allowing us to mechanically detect, probe, and rupture in real-time DSB synapsis by specific human NHEJ components. DNA-PKcs and Ku allow DNA end synapsis on the 100 ms timescale, and the addition of PAXX extends this lifetime to ~2 s. Further addition of XRCC4, XLF and ligase IV results in minute-scale synapsis and leads to robust repair of both strands of the nanomanipulated DNA...
May 21, 2018: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/29785674/assembly-of-a-complete-genome-sequence-for-gemmata-obscuriglobus-reveals-a-novel-prokaryotic-rrna-operon-gene-architecture
#3
Josef D Franke, Wilson R Blomberg, Robert T Todd, Robert W Thomas, Anna M Selmecki
Gemmata obscuriglobus is a Gram-negative bacterium with several intriguing biological features. Here, we present a complete, de novo whole genome assembly for G. obscuriglobus which consists of a single, circular 9 Mb chromosome, with no plasmids detected. The genome was annotated using the NCBI Prokaryotic Genome Annotation pipeline to generate common gene annotations. Analysis of the rRNA genes revealed three interesting features for a bacterium. First, linked G. obscuriglobus rrn operons have a unique gene order, 23S-5S-16S, compared to typical prokaryotic rrn operons (16S-23S-5S)...
May 21, 2018: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/29785479/ngspanpipe-a-pipeline-for-pan-genome-identification-in-microbial-strains-from-experimental-reads
#4
Umay Kulsum, Arti Kapil, Harpreet Singh, Punit Kaur
Recent advancements in sequencing technologies have decreased both time span and cost for sequencing the whole bacterial genome. High-throughput Next-Generation Sequencing (NGS) technology has led to the generation of enormous data concerning microbial populations publically available across various repositories. As a consequence, it has become possible to study and compare the genomes of different bacterial strains within a species or genus in terms of evolution, ecology and diversity. Studying the pan-genome provides insights into deciphering microevolution, global composition and diversity in virulence and pathogenesis of a species...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29785409/-de-novo-genome-and-transcriptome-resources-of-the-adzuki-bean-borer-ostrinia-scapulalis-lepidoptera-crambidae
#5
B Gschloessl, F Dorkeld, P Audiot, A Bretaudeau, C Kerdelhué, R Streiff
We present a draft genome assembly with a de novo prediction and automated functional annotation of coding genes, and a reference transcriptome of the Adzuki bean borer, Ostrinia scapulalis , based on RNA sequencing of various tissues and developmental stages. The genome assembly spans 419 Mb, has a GC content of 37.4% and includes 26,120 predicted coding genes. The reference transcriptome holds 33,080 unigenes and contains a high proportion of a set of genes conserved in eukaryotes and arthropods, used as quality assessment of the reconstructed transcripts...
April 2018: Data in Brief
https://www.readbyqxmd.com/read/29785397/whole-genome-sequencing-of-greater-amberjack-seriola-dumerili-for-snp-identification-on-aligned-scaffolds-and-genome-structural-variation-analysis-using-parallel-resequencing
#6
Kazuo Araki, Jun-Ya Aokic, Junya Kawase, Kazuhisa Hamada, Akiyuki Ozaki, Hiroshi Fujimoto, Ikki Yamamoto, Hironori Usuki
Greater amberjack ( Seriola dumerili ) is distributed in tropical and temperate waters worldwide and is an important aquaculture fish. We carried out de novo sequencing of the greater amberjack genome to construct a reference genome sequence to identify single nucleotide polymorphisms (SNPs) for breeding amberjack by marker-assisted or gene-assisted selection as well as to identify functional genes for biological traits. We obtained 200 times coverage and constructed a high-quality genome assembly using next generation sequencing technology...
2018: International Journal of Genomics
https://www.readbyqxmd.com/read/29784936/multiple-convergent-supergene-evolution-events-in-mating-type-chromosomes
#7
Sara Branco, Fantin Carpentier, Ricardo C Rodríguez de la Vega, Hélène Badouin, Alodie Snirc, Stéphanie Le Prieur, Marco A Coelho, Damien M de Vienne, Fanny E Hartmann, Dominik Begerow, Michael E Hood, Tatiana Giraud
Convergent adaptation provides unique insights into the predictability of evolution and ultimately into processes of biological diversification. Supergenes (beneficial gene linkage) are striking examples of adaptation, but little is known about their prevalence or evolution. A recent study on anther-smut fungi documented supergene formation by rearrangements linking two key mating-type loci, controlling pre- and post-mating compatibility. Here further high-quality genome assemblies reveal four additional independent cases of chromosomal rearrangements leading to regions of suppressed recombination linking these mating-type loci in closely related species...
May 21, 2018: Nature Communications
https://www.readbyqxmd.com/read/29784931/reconstruction-of-the-diapsid-ancestral-genome-permits-chromosome-evolution-tracing-in-avian-and-non-avian-dinosaurs
#8
Rebecca E O'Connor, Michael N Romanov, Lucas G Kiazim, Paul M Barrett, Marta Farré, Joana Damas, Malcolm Ferguson-Smith, Nicole Valenzuela, Denis M Larkin, Darren K Griffin
Genomic organisation of extinct lineages can be inferred from extant chromosome-level genome assemblies. Here, we apply bioinformatic and molecular cytogenetic approaches to determine the genomic structure of the diapsid common ancestor. We then infer the events that likely occurred along this lineage from theropod dinosaurs through to modern birds. Our results suggest that most elements of a typical 'avian-like' karyotype (40 chromosome pairs, including 30 microchromosomes) were in place before the divergence of turtles from birds ~255 mya...
May 21, 2018: Nature Communications
https://www.readbyqxmd.com/read/29784930/comparative-mrna-and-mirna-expression-in-european-mouflon-ovis-musimon-and-sheep-ovis-aries-provides-novel-insights-into-the-genetic-mechanisms-for-female-reproductive-success
#9
Ji Yang, Xin Li, Yin-Hong Cao, Kisun Pokharel, Xiao-Ju Hu, Ze-Hui Chen, Song-Song Xu, Jaana Peippo, Mervi Honkatukia, Juha Kantanen, Meng-Hua Li
Prolific breeds of domestic sheep (Ovis aries) are important genetic resources due to their reproductive performance, which is characterized by multiple lambs per birth and out-of-season breeding. However, the lack of a comprehensive understanding of the genetic mechanisms underlying the important reproductive traits, particularly from the evolutionary genomics perspective, has impeded the efficient advancement of sheep breeding. Here, for the first time, by performing RNA-sequencing we built a de novo transcriptome assembly of ovarian and endometrial tissues in European mouflon (Ovis musimon) and performed an mRNA-miRNA integrated expression profiling analysis of the wild species and a highly prolific domestic sheep breed, the Finnsheep...
May 21, 2018: Heredity
https://www.readbyqxmd.com/read/29783941/a-transposable-element-annotation-pipeline-and-expression-analysis-reveal-potentially-active-elements-in-the-microalga-tisochrysis-lutea
#10
Jérémy Berthelier, Nathalie Casse, Nicolas Daccord, Véronique Jamilloux, Bruno Saint-Jean, Grégory Carrier
BACKGROUND: Transposable elements (TEs) are mobile DNA sequences known as drivers of genome evolution. Their impacts have been widely studied in animals, plants and insects, but little is known about them in microalgae. In a previous study, we compared the genetic polymorphisms between strains of the haptophyte microalga Tisochrysis lutea and suggested the involvement of active autonomous TEs in their genome evolution. RESULTS: To identify potentially autonomous TEs, we designed a pipeline named PiRATE (Pipeline to Retrieve and Annotate Transposable Elements, download: https://doi...
May 22, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29783636/transcriptomic-analysis-of-pseudoscorpion-venom-reveals-a-unique-cocktail-dominated-by-enzymes-and-protease-inhibitors
#11
Carlos E Santibáñez-López, Andrew Z Ontano, Mark S Harvey, Prashant P Sharma
Transcriptomic and genomic analyses have illuminated the diversity of venoms in three of the four venomous arachnid orders (scorpions, spiders, and ticks). To date, no venom gland transcriptome analysis has been available for pseudoscorpions, the fourth venomous arachnid lineage. To redress this gap, we sequenced an mRNA library generated from the venom glands of the species Synsphyronus apimelus (Garypidae). High-throughput sequencing by the Illumina protocol, followed by de novo assembly, resulted in a total of 238,331 transcripts...
May 18, 2018: Toxins
https://www.readbyqxmd.com/read/29782550/multiple-roles-of-core-protein-linker-in-hepatitis-b-virus-replication
#12
Kuancheng Liu, Laurie Luckenbaugh, Xiaojun Ning, Ji Xi, Jianming Hu
Hepatitis B virus (HBV) core protein (HBc) contains an N-terminal domain (NTD, assembly domain) and a C-terminal domain (CTD), which are linked by a flexible linker region. HBc plays multiple essential roles in viral replication, including capsid assembly, packaging of the viral pregenomic RNA (pgRNA) into nucleocapsids, viral reverse transcription that converts pgRNA to the genomic DNA, and secretion of DNA-containing (complete) virions or genome-free (empty) virions. The HBc linker is generally assumed to act merely as a spacer between NTD and CTD but some results suggest that the linker may affect NTD assembly...
May 21, 2018: PLoS Pathogens
https://www.readbyqxmd.com/read/29780368/-salmonella-enterica-prophage-sequence-profiles-reflect-genome-diversity-and-can-be-used-for-high-discrimination-subtyping
#13
Walid Mottawea, Marc-Olivier Duceppe, Andrée A Dupras, Valentine Usongo, Julie Jeukens, Luca Freschi, Jean-Guillaume Emond-Rheault, Jeremie Hamel, Irena Kukavica-Ibrulj, Brian Boyle, Alexander Gill, Elton Burnett, Eelco Franz, Gitanjali Arya, Joel T Weadge, Samantha Gruenheid, Martin Wiedmann, Hongsheng Huang, France Daigle, Sylvain Moineau, Sadjia Bekal, Roger C Levesque, Lawrence D Goodridge, Dele Ogunremi
Non-typhoidal Salmonella is a leading cause of foodborne illness worldwide. Prompt and accurate identification of the sources of Salmonella responsible for disease outbreaks is crucial to minimize infections and eliminate ongoing sources of contamination. Current subtyping tools including single nucleotide polymorphism (SNP) typing may be inadequate, in some instances, to provide the required discrimination among epidemiologically unrelated Salmonella strains. Prophage genes represent the majority of the accessory genes in bacteria genomes and have potential to be used as high discrimination markers in Salmonella ...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29778876/genome-sequence-analysis-of-a-novel-bacillus-thuringiensis-strain-blb406-active-against-aedes-aegypti-larvae-a-novel-potential-bioinsecticide
#14
Raida Zribi Zghal, Kais Ghedira, Jihen Elleuch, Marwa Kharrat, Slim Tounsi
BLB406 is a novel isolate of Bacillus thuringiensis with a larvicidal activity against Aedes aegypti larvae. It displays original plasmidic and crystal protein patterns. The present work reported molecular and bioinformatic analyses for the genome sequence of BLB406 using MiSeq Illumina next-generation sequencing technology. The reads were assembled by Velvet tool. Using RAST program and PGAAP the genome of BLB406 strain was shown to contain 6297 genes corresponding to 5924 protein coding sequences. The BLB406 genome investigation with BtToxin_scanner program shows that this strain has an original and different combination of toxins compared to the published ones: five cry genes (cry11, cry22, cry2, cry60, cry64) and two distinct vegetative insecticidal vip4 genes...
May 17, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29778836/interrogation-of-mammalian-protein-complex-structure-function-and-membership-using-genome-scale-fitness-screens
#15
Joshua Pan, Robin M Meyers, Brittany C Michel, Nazar Mashtalir, Ann E Sizemore, Jonathan N Wells, Seth H Cassel, Francisca Vazquez, Barbara A Weir, William C Hahn, Joseph A Marsh, Aviad Tsherniak, Cigall Kadoch
Protein complexes are assemblies of subunits that have co-evolved to execute one or many coordinated functions in the cellular environment. Functional annotation of mammalian protein complexes is critical to understanding biological processes, as well as disease mechanisms. Here, we used genetic co-essentiality derived from genome-scale RNAi- and CRISPR-Cas9-based fitness screens performed across hundreds of human cancer cell lines to assign measures of functional similarity. From these measures, we systematically built and characterized functional similarity networks that recapitulate known structural and functional features of well-studied protein complexes and resolve novel functional modules within complexes lacking structural resolution, such as the mammalian SWI/SNF complex...
May 14, 2018: Cell Systems
https://www.readbyqxmd.com/read/29778661/epigenetic-dysregulation-of-zeb1-is-involved-in-lmo2-promoted-t-cell-acute-lymphoblastic-leukaemia-leukaemogenesis
#16
Chao Wu, Jianjun Li, Chenchen Tian, Wen Shi, Huimin Jiang, Zhen Zhang, Hang Wang, Quansheng Zhang, Wei Sun, Peiqing Sun, Rong Xiang, Shuang Yang
T-cell acute lymphoblastic leukaemia (T-ALL) is a hematological malignancy caused by the accumulation of genomic lesions that affect the development of T-cells. ZEB1, a member of zinc finger-homeodomain family transcription factor, exhibits crucial function in promoting T-cell differentiation and potentially acts as a tumor suppressor in T-ALL. However, the molecular mechanism by which ZEB1 regulates T-ALL leukaemogenesis remains obscure. Here, we showed that oncogenic LIM only 2 (LMO2) could recruit Sap18 and HDAC1 to assemble an epigenetic regulatory complex, thus inducing histone deacetylation in ZEB1 promoter and chromatin remodeling to achieve transcriptional repression...
May 17, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29777775/genome-analysis-of-the-ancient-tracheophyte-selaginella-tamariscina-reveals-evolutionary-features-relevant-to-the-acquisition-of-desiccation-tolerance
#17
Zhichao Xu, Tianyi Xin, Dorothea Bartels, Ying Li, Wei Gu, Hui Yao, Sai Liu, Haoying Yu, Xiangdong Pu, Jianguo Zhou, Jiang Xu, Caicai Xi, Hetian Lei, Jingyuan Song, Shilin Chen
Resurrection plants, which are the "gifts" of natural evolution, are ideal models for studying genetic basis of plant desiccation tolerance. Here, we report a high-quality genome assembly of 301 Mb for the diploid spike moss Selaginella tamariscina, a primitive vascular resurrection plant. We predicated 27,761 protein-coding genes from the assembled S. tamariscina genome, 11.38% (2363) of which showed significant expression changes in response to desiccation. Approximately 60.58% of the S. tamariscina genome was annotated as repetitive DNA, which is almost 2-fold increase of that in the genome of desiccation-sensitive S...
May 16, 2018: Molecular Plant
https://www.readbyqxmd.com/read/29776991/inversion-variants-in-human-and-primate-genomes
#18
Claudia Rita Catacchio, Flavia Angela Maria Maggiolini, Pietro D'Addabbo, Miriana Bitonto, Oronzo Capozzi, Martina Lepore Signorile, Mattia Miroballo, Nicoletta Archidiacono, Evan E Eichler, Mario Ventura, Francesca Antonacci
For many years, inversions have been proposed to be a direct driving force in speciation since they suppress recombination when heterozygous. Inversions are the most common large-scale differences among humans and great apes. Nevertheless, they represent large events easily distinguishable by classical cytogenetics, whose resolution, however, is limited. Here, we performed a genome-wide comparison between human, great ape, and macaque genomes using the net alignments for the most recent releases of genome assemblies...
May 18, 2018: Genome Research
https://www.readbyqxmd.com/read/29776372/curation-of-microarray-oligonucleotides-and-corresponding-ests-cdnas-used-for-gene-expression-analysis-in-zebra-finches
#19
Peter V Lovell, Nicole A Huizinga, Abel Getachew, Brianna Mees, Samantha R Friedrich, Morgan Wirthlin, Claudio V Mello
OBJECTIVES: Zebra finches are a major model organism for investigating mechanisms of vocal learning, a trait that enables spoken language in humans. The development of cDNA collections with expressed sequence tags (ESTs) and microarrays has allowed for extensive molecular characterizations of circuitry underlying vocal learning and production. However, poor database curation can lead to errors in transcriptome and bioinformatics analyses, limiting the impact of these resources. Here we used genomic alignments and synteny analysis for orthology verification to curate and reannotate ~ 35% of the oligonucleotides and corresponding ESTs/cDNAs that make-up Agilent microarrays for gene expression analysis in finches...
May 18, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29774473/genomic-and-probiotic-characterization-of-sjp-snu-strain-of-pichia-kudriavzevii
#20
Seung-Min Hong, Hyuk-Joon Kwon, Se-Joon Park, Won-Jin Seong, Ilhwan Kim, Jae-Hong Kim
The yeast strain SJP-SNU was investigated as a probiotic and was characterized with respect to growth temperature, bile salt resistance, hydrogen sulfide reducing activity, intestinal survival ability and chicken embryo pathogenicity. In addition, we determined the complete genomic and mitochondrial sequences of SJP-SNU and conducted comparative genomics analyses. SJP-SNU grew rapidly at 37 °C and formed colonies on MacConkey agar containing bile salt. SJP-SNU reduced hydrogen sulfide produced by Salmonella serotype Enteritidis and, after being fed to 4-week-old chickens, could be isolated from cecal feces...
May 17, 2018: AMB Express
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