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At least 253 records · Page 14Linked to original sources
PubMed2026

Global Diffusion of IncC Plasmid Harboring blaNDM-1in the High-Risk Escherichia coli ST131 Clone.

AIMS: The global expansion of quinolone-resistant Escherichia coli (QR-EC) is increasingly associated with β-lactam resistance and mobile genetic elements that facilitate resistance dissemination. This study investigated the molecular mechanisms underlying fluoroquinolone and β-lactam resistance in clinical QR-EC isolates and explored the plasmid type associated. METHODS AND RESULTS: A total of 123 non-duplicate QR-EC clinical isolates responsible mainly for gastrointestinal colonization were collected between 2019 and 2021. Plasmid-mediated quinolone resistance (PMQR), extended-spectrum β-lactamase (ESBL), and carbapenemase genes were screened by PCR. Mutations in the quinolone resistance-determining regions (QRDR) of gyrA and parC were analyzed using sequencing and mismatch amplification mutation assay PCR (MAMA-PCR). Selected isolates underwent multilocus sequence typing (MLST). Whole-genome sequencing (WGS) of a representative extensively drug-resistant strain carrying multiple quinolone resistance determinants, ESBL genes, and carbapenemase genes, was performed. PMQR genes were prevalent among QR-EC, dominated by aac(6')-Ib-cr (60.9% of isolates). ESBL genes were identified in 93.5% of isolates, predominantly blaCTX-M (95.7%). Among ertapenem-resistant isolates (QCR-EC) (n=18), blaNDM-1 and blaOXA-48 were detected in 13 and 11 isolates, respectively. QRDR mutations were highly frequent, particularly gyrA83 (98.4%) and parC80 (30.9%). Major QCR-EC genotypes belonged to sequence types ST167 (n=2), ST1196, ST469, and ST410. High-risk E. coli ST131 clone harboring IncC plasmid encoding blaNDM-1 was described for the first time in Africa, following its emergence, in two continents, Asia and America. Despite the very rare description of these strains worldwide, their description in three continents sign their global diffusion. CONCLUSIONS: This finding highlights the ongoing spread of carbapenem resistance and underscores the urgent need for strengthened genomic surveillance.

Escherichia coli↗
PubMed2005

Fifty-four new gene-based canine microsatellite markers.

Fifty-four new markers were developed to fill in gaps in the current map of canine microsatellites and to complement existing markers that may not be sufficiently informative in highly inbred canine pedigrees. Canine genes contained on the radiation hybrid map were used to obtain the sequence of the human homolog. A BLAST search versus the canine whole genome shotgun (wgs) sequence resource was used to obtain the sequence of the canine genomic contigs containing the homolog of the corresponding human gene. Canine sequences that contained microsatellites and mapped back to the correct location in the human genome were used to design primers for amplification of the microsatellites from canine genomic DNA. Heterozygosities of the markers were tested by genotyping grandparental DNAs obtained from the Nestle Purina Reference family DNA distribution center plus DNAs from unrelated Bouviers and Irish wolfhounds. Canine map positions of markers on the July 2004 freeze of the canine genome assembly were determined by in silico PCR or BLAST.

Animals↗
PubMed2004

The EMBL Nucleotide Sequence Database.

The EMBL Nucleotide Sequence Database (http://www.ebi.ac.uk/embl/), maintained at the European Bioinformatics Institute (EBI), incorporates, organizes and distributes nucleotide sequences from public sources. The database is a part of an international collaboration with DDBJ (Japan) and GenBank (USA). Data are exchanged between the collaborating databases on a daily basis to achieve optimal synchrony. The web-based tool, Webin, is the preferred system for individual submission of nucleotide sequences, including Third Party Annotation (TPA) and alignment data. Automatic submission procedures are used for submission of data from large-scale genome sequencing centres and from the European Patent Office. Database releases are produced quarterly. The latest data collection can be accessed via FTP, email and WWW interfaces. The EBI's Sequence Retrieval System (SRS) integrates and links the main nucleotide and protein databases as well as many other specialist molecular biology databases. For sequence similarity searching, a variety of tools (e.g. FASTA and BLAST) are available that allow external users to compare their own sequences against the data in the EMBL Nucleotide Sequence Database, the complete genomic component subsection of the database, the WGS data sets and other databases. All available resources can be accessed via the EBI home page at http://www.ebi.ac.uk.

Animals↗
PubMed2004

Comparative analysis of the Borrelia garinii genome.

Three members of the genus Borrelia (B.burgdorferi, B.garinii, B.afzelii) cause tick-borne borreliosis. Depending on the Borrelia species involved, the borreliosis differs in its clinical symptoms. Comparative genomics opens up a way to elucidate the underlying differences in Borrelia species. We analysed a low redundancy whole-genome shotgun (WGS) assembly of a B.garinii strain isolated from a patient with neuroborreliosis in comparison to the B.burgdorferi genome. This analysis reveals that most of the chromosome is conserved (92.7% identity on DNA as well as on amino acid level) in the two species, and no chromosomal rearrangement or larger insertions/deletions could be observed. Furthermore, two collinear plasmids (lp54 and cp26) seem to belong to the basic genome inventory of Borrelia species. These three collinear parts of the Borrelia genome encode 861 genes, which are orthologous in the two species examined. The majority of the genetic information of the other plasmids of B.burgdorferii is also present in B.garinii although orthology is not easy to define due to a high redundancy of the plasmid fraction. Yet, we did not find counterparts of the B.burgdorferi plasmids lp36 and lp38 or their respective gene repertoire in the B.garinii genome. Thus, phenotypic differences between the two species could be attributable to the presence or absence of these two plasmids as well as to the potentially positively selected genes.

Borrelia burgdorferi↗
PubMed2006

PigGIS: Pig Genomic Informatics System.

Pig Genomic Information System (PigGIS) is a web-based depository of pig (Sus scrofa) genomic learning mainly engineered for biomedical research to locate pig genes from their human homologs and position single nucleotide polymorphisms (SNPs) in different pig populations. It utilizes a variety of sequence data, including whole genome shotgun (WGS) reads and expressed sequence tags (ESTs), and achieves a successful mapping solution to the low-coverage genome problem. With the data presently available, we have identified a total of 15 700 pig consensus sequences covering 18.5 Mb of the homologous human exons. We have also recovered 18 700 SNPs and 20 800 unique 60mer oligonucleotide probes for future pig genome analyses. PigGIS can be freely accessed via the web at http://www.piggis.org/ and http://pig.genomics.org.cn/.

Animals↗
PubMed2006

DDBJ working on evaluation and classification of bacterial genes in INSDC.

DNA Data Bank of Japan (DDBJ) (http://www.ddbj.nig.ac.jp) newly collected and released 12,927,184 entries or 13,787,688,598 bases in the period from July 2005 to June 2006. The released data contain honeybee expressed sequence tags (ESTs), re-examined and re-annotated complete genome data of Escherichia coli K-12 W3110, medaka WGS and human MGA. We also systematically evaluated and classified the genes in the complete bacterial genomes submitted to the International Nucleotide Sequence Database Collaboration (INSDC, http://insdc.org) that is composed of DDBJ, EMBL Bank and GenBank. The examination and classification selected 557,000 genes as reliable ones among all the bacterial genes predicted by us.

Animals↗
PubMed2006

Aspects of harmonisation of individual monitoring for external radiation in Europe: conclusions of a EURADOS action.

Following the publication of the EU Council Directive 96/29, EURADOS coordinated two working groups (WGs) for promoting the process of harmonisation on individual monitoring of occupationally exposed persons in Europe. An overview of the major findings of the second WG is presented. Information on the technical and quality standards and on the accreditation and approval procedures has been compiled. The catalogue of dosimetric services has been updated and extended. An overview of national regulations and standards for protection from radon and other natural sources in workplaces has been made, attempting to combine the results from individual monitoring for external, internal and workplace monitoring. A first status description of the active personal dosemeters, including legislative and technical information, and their implementation has been made. The importance of practical factors on the uncertainty in the dose measurement has been estimated. Even if a big progress has been made towards harmonisation, there is still work to be done.

Europe↗
PubMed2024

The Genetic Determinants and Genomic Consequences of Non-Leukemogenic Somatic Point Mutations.

Clonal hematopoiesis (CH) is defined by the expansion of a lineage of genetically identical cells in blood. Genetic lesions that confer a fitness advantage, such as point mutations or mosaic chromosomal alterations (mCAs) in genes associated with hematologic malignancy, are frequent mediators of CH. However, recent analyses of both single cell-derived colonies of hematopoietic cells and population sequencing cohorts have revealed CH frequently occurs in the absence of known driver genetic lesions. To characterize CH without known driver genetic lesions, we used 51,399 deeply sequenced whole genomes from the NHLBI TOPMed sequencing initiative to perform simultaneous germline and somatic mutation analyses among individuals without leukemogenic point mutations (LPM), which we term CH-LPMneg. We quantified CH by estimating the total mutation burden. Because estimating somatic mutation burden without a paired-tissue sample is challenging, we developed a novel statistical method, the Genomic and Epigenomic informed Mutation (GEM) rate, that uses external genomic and epigenomic data sources to distinguish artifactual signals from true somatic mutations. We performed a genome-wide association study of GEM to discover the germline determinants of CH-LPMneg. After fine-mapping and variant-to-gene analyses, we identified seven genes associated with CH-LPMneg (TCL1A, TERT, SMC4, NRIP1, PRDM16, MSRA, SCARB1), and one locus associated with a sex-associated mutation pathway (SRGAP2C). We performed a secondary analysis excluding individuals with mCAs, finding that the genetic architecture was largely unaffected by their inclusion. Functional analyses of SMC4 and NRIP1 implicated altered HSC self-renewal and proliferation as the primary mediator of mutation burden in blood. We then performed comprehensive multi-tissue transcriptomic analyses, finding that the expression levels of 404 genes are associated with GEM. Finally, we performed phenotypic association meta-analyses across four cohorts, finding that GEM is associated with increased white blood cell count and increased risk for incident peripheral artery disease, but is not significantly associated with incident stroke or coronary disease events. Overall, we develop GEM for quantifying mutation burden from WGS without a paired-tissue sample and use GEM to discover the genetic, genomic, and phenotypic correlates of CH-LPMneg.

Journal Article↗
PubMed2025

Phylogenetically diverse introgression drives subtle population structure in Pacific rockfishes.

Genomic methods have shown that admixture and introgression is common across animal taxa. Pacific rockfishes, genus Sebastes, are group of commercially important species that primarily inhabit inshore, shelf, and slope habitats along the North American west coast. Among these, Copper and Quillback Rockfishes (abbreviated to Copper and Quillback) are closely related species known to hybridize, particularly within the Salish Sea in North America's Pacific Northwest. Here, we investigate genetic population structure and introgression patterns in Copper and Quillback from Alaska to California. Using whole-genome resequencing (WGS) across a broad geographic range, we seek to (1) compare population structure between these species, and (2) assess how introgression affects population structure patterns. Our analyses reveal that Copper exhibit much higher levels of population differentiation compared to Quillback, especially separating Salish Sea samples from all other populations. In contrast, Quillback populations appear to be nearly panmictic, with lower overall differentiation. Surprisingly, we detected signatures of introgression from 13 other rockfish species in Copper and 16 species in Quillback. This introgression was highly regional suggesting hybridization depended on geographic context and congener ranges. Yelloweye Rockfish introgression drives the strongest signal of regional population structure in Quillback. These findings provide novel insights into the range-wide genetic structure of these species and highlight that hybridization in Sebastes is phylogenetically broader than previously appreciated.

Journal Article↗
PubMed2004

Dynamic building of a BAC clone tiling path for the Rat Genome Sequencing Project.

CLONEPICKER is a software pipeline that integrates sequence data with BAC clone fingerprints to dynamically select a minimal overlapping clone set covering the whole genome. In the Rat Genome Sequencing Project (RGSP), a hybrid strategy of "clone by clone" and "whole genome shotgun" approaches was used to maximize the merits of both approaches. Like the "clone by clone" method, one key challenge for this strategy was to select a low-redundancy clone set that covered the whole genome while the sequencing is in progress. The CLONEPICKER pipeline met this challenge using restriction enzyme fingerprint data, BAC end sequence data, and sequences generated from individual BAC clones as well as WGS reads. In the RGSP, an average of 7.5 clones was identified from each side of a seed clone, and the minimal overlapping clones were reliably selected. Combined with the assembled BAC fingerprint map, a set of BAC clones that covered >97% of the genome was identified and used in the RGSP.

Animals↗
PubMed2006

Differential lineage-specific amplification of transposable elements is responsible for genome size variation in Gossypium.

The DNA content of eukaryotic nuclei (C-value) varies approximately 200,000-fold, but there is only a approximately 20-fold variation in the number of protein-coding genes. Hence, most C-value variation is ascribed to the repetitive fraction, although little is known about the evolutionary dynamics of the specific components that lead to genome size variation. To understand the modes and mechanisms that underlie variation in genome composition, we generated sequence data from whole genome shotgun (WGS) libraries for three representative diploid (n = 13) members of Gossypium that vary in genome size from 880 to 2460 Mb (1C) and from a phylogenetic outgroup, Gossypioides kirkii, with an estimated genome size of 588 Mb. Copy number estimates including all dispersed repetitive sequences indicate that 40%-65% of each genome is composed of transposable elements. Inspection of individual sequence types revealed differential, lineage-specific expansion of various families of transposable elements among the different plant lineages. Copia-like retrotransposable element sequences have differentially accumulated in the Gossypium species with the smallest genome, G. raimondii, while gypsy-like sequences have proliferated in the lineages with larger genomes. Phylogenetic analyses demonstrated a pattern of lineage-specific amplification of particular subfamilies of retrotransposons within each species studied. One particular group of gypsy-like retrotransposon sequences, Gorge3 (Gossypium retrotransposable gypsy-like element), appears to have undergone a massive proliferation in two plant lineages, accounting for a major fraction of genome-size change. Like maize, Gossypium has undergone a threefold increase in genome size due to the accumulation of LTR retrotransposons over the 5-10 Myr since its origin.

Base Sequence↗
PubMed2026

Analysis of CYLD gene variants in 41 patients with multiple familial trichoepithelioma.

OBJECTIVE: To investigate the variants of the CYLD gene in Chinese patients with multiple familial trichoepithelioma (MFT), aiming to provide a scientific basis for genetic counseling and prenatal diagnosis, thereby creating favorable conditions for intervention treatment and improving the prognosis of patients. PATIENTS AND METHODS: Whole-exome sequencing (WES) was performed in patients from eleven families to identify candidate variants, which were subsequently confirmed by Sanger sequencing. The minigene technique was used to perform functional analyses of the variants c.2342-8C>G and c.1685-9T>G. Whole-genome sequencing (WGS) was applied in patients with negative WES results. RESULTS: All 41 patients presented with multiple papules or nodules on the nose. We identified six novel pathogenic variants and three recurrent pathogenic variants. Conversely, no gene variants were detected in four patients. The c.1685-9T>G variant caused aberrant mRNA splicing, resulting in the insertion of an 8-base intronic sequence into the mRNA and subsequent premature termination, while the variant c.2342-8C>G led to premature mRNA splicing seven bases upstream of the canonical splice site. CONCLUSIONS: This study identified six novel and three recurrent pathogenic variants in the CYLD gene among 41 patients with MFT. Comprising the largest sample size report in this field to date, this work considerably expands the mutational spectrum of the CYLD gene (currently comprising 144 variants) and carries important implications for genetic counseling.

Humans↗
PubMed2026

Wildlife Trade and Genetic Basis of Disease Susceptibility: A Review.

The surge in the trade of wildlife and wildlife products drives several species to extinction while coinciding with the increase in several zoonotic diseases. It is therefore essential to explore the roles of wildlife trade in disease transmission, and how the knowledge of genetics and immunogenetics can help in alleviating the attending challenges. Pathogen-driven selection plays a fundamental role in maintaining immune gene diversity, as individuals with alleles conferring resistance to endemic diseases have higher survival rate. However, anthropogenic disturbances, such as wildlife exploitation, can disrupt these evolutionary processes, leading to reduced genetic diversity and increased disease vulnerability. Advanced genomic tools, such as next-generation sequencing (NGS), whole-genome sequencing (WGS), CRISPR-Cas9 gene editing, genome-wide association studies (GWAS), epigenetics and transcriptomic analysis, can help identify immune gene variations and predict disease susceptibility in both wild and captive populations. Massive research targeting wildlife markets and the interface between the wild and the market players is necessary. It would be interesting to understand dynamics of pathogens and disease susceptibility, through the application of genetics and immunogenetics, thereby enhancing efforts to address the challenges posed by wildlife trade and zoonotic disease emergence.

Animals↗
PubMed2026

Integrative Long-Read Multi-Omics of a Patient With GPI Deficiency: A Molecular Case Study of a Candidate Dual-Effect GPI Variant.

The molecular determinants of phenotypic severity in red cell enzymopathies are often obscured by the disconnect between coding sequence variants and their regulatory landscapes. Here we present a single-patient molecular case study that uses an integrative multi-omic approach-combining short-read WGS, PacBio HiFi long-read sequencing, native CpG methylation profiling, and Iso-Seq full-length transcriptomics-to characterize a severe, transfusion-dependent hemolytic anaemia. We identified a compound heterozygous state in the glucose-6-phosphate isomerase (GPI) gene, with no wild-type allele present. One allele (Haplotype 1) carried a missense variant (p.His191Arg); the other (Haplotype 2) carried a distinct missense variant, c.1414C>T (p.Arg472Cys), previously reported as biochemically unstable. Long-read phasing placed the two variants in trans. Allele-resolved transcript counts showed a directionally consistent but statistically non-significant trend toward higher expression of Haplotype 2 across two Iso-Seq replicates. Notably, the c.1414C>T transition abolishes a local CpG dinucleotide; in a small number of haplotype-2 reads spanning this position, the corresponding cytosine on the wild-type/Haplotype-1 background was methylated. We did not measure GPI protein abundance, enzymatic activity, or stability in this patient, and we do not establish that methylation at this site regulates GPI transcription. On the basis of these correlative observations in a single patient, we propose-as a hypothesis for future testing-that a coding variant might simultaneously perturb protein stability and disrupt a local epigenetic mark, and we outline the experiments required to test whether such a dual effect contributes to disease. This case illustrates the value of integrative long-read multi-omics for generating mechanistic hypotheses about variants of uncertain significance, while underscoring that causal claims require dedicated functional validation.

Humans↗
PubMed2026

Patterns of Drug Resistance, Drug Resistance Conferring Mutations and Genomic DNA Methylation Revealed in Mycobacterium tuberculosis From South Africa.

Tuberculosis remains a major public health threat globally, with drug-resistant strains undermining treatment efficacy. We analyzed 126 Mycobacterium tuberculosis (M. tuberculosis) isolates with diverse drug resistance spectra and selected 35 for whole genome sequencing (WGS) using Illumina NextSeq, SMRT PacBio Onso and SMRT PacBio Revio sequencing platforms. The study aimed to characterize drug resistance profiles, compare short- and long-read sequencing performance, identify lineages among South African isolates, detect known drug resistance mutations and their lineage-specific patterns, and utilize long-read SMRT platforms for epigenetic profiling. Multiple drug resistance mutations were identified, some lineage-specific, and notably, East-African-Indian (EAI) Lineage 1 isolates often considered less pathogenic, showed significant potential for multidrug-resistance development, including higher fluoroquinolone resistance as compared to other lineages. Three DNA motifs with methylated adenines, namely CACGCaG, CtCCaG and GaTNNNNRtAC, were detected, with methylation patterns varying by lineage and strain due to mutations in the corresponding methyltransferases (MTases). A particularly notable finding was the stable maintenance of a genetic heterogeneity in the mamB MTase, performing methylation at CACGCaG motifs. These results highlight the combined role of genetic and epigenetic variation in M. tuberculosis adaptive evolution and underscore the value of integrating long-read sequencing into TB surveillance and research.

Mycobacterium tuberculosis↗
PubMed2025

Accumulation of numerous cellular T-DNA sequences in the genus Diospyros by multiple rounds of natural transformation.

Horizontal gene transfer (HGT) is an important phenomenon in the evolutionary history of plants. Natural transformation by Agrobacterium is a special case of HGT and leads to the insertion of cellular T-DNA (cT-DNA) sequences, for example, in Diospyros lotus. The genus Diospyros contains about 795 species with economically important members, like different types of persimmon (D. kaki, D. lotus, and D. virginiana) and ebony (e.g., D. ebenum). Whole genome sequences (WGS) from D. kaki, D. oleifera, D. lotus, and D. virginiana were investigated for cT-DNAs. These four species belong to one clade and contain 15 different cT-DNAs (DiTA to DiTO). The hexaploid species D. kaki cv. "Xiaoguo-tianshi" contains seven types of cT-DNA (DiTA to DiTG) on 27 of 42 homeologs, adding up to 628 kb of cT-DNA. Five of these seven cT-DNAs are non-fixed, as shown by empty chromosomal insertion sites. The evolutionary history of the Diospyros cT-DNAs was reconstructed using the divergence of their inverted repeats. Insert age varied from 3 to 12 million years. Partial cT-DNA sequences were detected in 35 additional species from five Diospyros clades. Our data highlight the unexpectedly large scale of natural Agrobacterium transformation in Diospyros and demonstrate the necessity of whole genome approaches for studies on the origin and evolution of cT-DNAs.

Diospyros↗
PubMed2026

Embryophyte-wide detection of natural Agrobacterium-mediated horizontal gene transfer reveals an ancient role for mini T-DNAs.

Agrobacterium transfers DNA into plant cells, leading to tumors, hairy roots (HR), and natural genetically modified organisms (nGMOs). Transferred DNAs (T-DNAs) from agrobacteria and T-DNA-derived cellular T-DNAs (cT-DNAs) from nGMOs vary considerably and may carry up to 15 different genes. Among these, opine synthase (ops) genes encode the synthesis of opines used as nutrients by the agrobacteria. Earlier studies predicted large numbers of naturally transformed plant species, but only few have been identified and studied so far. We therefore developed a general method to detect cT-DNAs in all publicly available whole genome sequences (WGS) and Sequence Read Archive (SRA) data from land plants. To avoid false positives, we only retained DNA sequences coding for T-DNA proteins. A total of 2614 nGMO species were identified, most are eudicots. However, cT-DNAs were also found in 82 mosses and 75 ferns, showing that Agrobacterium can also generate natural transformants among the early land plants. Analysis of 149 cT-DNA maps revealed different types of T-DNAs. Most notably, these included small T-DNAs (mini T-DNAs) with a single opine synthase gene. Mini T-DNAs are not expected to induce tumors or HRs. The predominance of mini cT-DNAs in mosses and ferns, and the presence of more complex cT-DNAs in spermatophytes, indicate that mini T-DNAs represent the earliest types of T-DNA. Our study also detected unusual T-DNA integration patterns, with multiple copies spread out over several hundreds of kilobases.

DNA, Bacterial↗
PubMed2026

Whole Genome Characterization of Klebsiella Strains in European Hedgehogs and Human Nosocomial Settings Identified Shared Sequence Types, Antimicrobial Resistance Genes and Plasmids.

INTRODUCTION: Klebsiella pneumoniae is a pathogen associated with healthcare-acquired infections and antimicrobial resistance (AMR) to beta-lactams and carbapenems. Although wild animals are not typically exposed to antibiotics, they can harbour resistant strains. The European hedgehog (Erinaceus europaeus) is increasingly found in urban areas, where it interacts with humans and livestock. Studies have identified concerning levels of AMR in hedgehogs, including Extended-Spectrum β-Lactam (ESBL) and carbapenems-resistant Klebsiella pneumoniae strains. METHODS: This study focuses on Klebsiella spp. isolated in hedgehogs from urban areas, using whole-genome sequencing (WGS). We compared these isolates with openly available strains isolated from humans in the same region with the objective to have a thorough understanding of ST, AMR gene, and plasmid overlap between human and environmental compartments. RESULTS: High AMR gene levels, including the carbapenemase blaOXA-48, were found in the hedgehog population. Notably, human nosocomial clones, including ST307 and ST392, globally distributed sequence types also found in wildlife, were identified in both hedgehogs and humans. The presence of conjugative plasmids, including IncFIB(K) and IncL1 types, was identified in both hedgehogs and humans, highlighting plasmid dissemination as a significant factor in AMR spread. CONCLUSIONS: Although no direct transmission from wildlife to hospital settings has been conclusively demonstrated, our findings suggest that hedgehogs may play a role in bridging environmental and healthcare environments. The study underscores the need for further investigation into multidrug-resistant Klebsiella spp. and other resistant bacteria in wildlife to better understand their potential role in the dissemination of resistance genes across ecosystems.

Animals↗