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Terrazos Miani MA, Borcard L, Gempeler S, Baumann C, Bittel P, Leib SL, Neuenschwander S, Ramette A. NASCarD (Nanopore Adaptive Sampling with Carrier DNA): A Rapid, PCR-Free Method for SARS-CoV-2 Whole-Genome Sequencing in Clinical Samples. Pathogens 2024; 13:61. [PMID: 38251368 PMCID: PMC10818518 DOI: 10.3390/pathogens13010061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/04/2024] [Accepted: 01/07/2024] [Indexed: 01/23/2024] Open
Abstract
Whole-genome sequencing (WGS) represents the main technology for SARS-CoV-2 lineage characterization in diagnostic laboratories worldwide. The rapid, near-full-length sequencing of the viral genome is commonly enabled by high-throughput sequencing of PCR amplicons derived from cDNA molecules. Here, we present a new approach called NASCarD (Nanopore Adaptive Sampling with Carrier DNA), which allows a low amount of nucleic acids to be sequenced while selectively enriching for sequences of interest, hence limiting the production of non-target sequences. Using COVID-19 positive samples available during the omicron wave, we demonstrate how the method may lead to >99% genome completeness of the SARS-CoV-2 genome sequences within 7 h of sequencing at a competitive cost. The new approach may have applications beyond SARS-CoV-2 sequencing for other DNA or RNA pathogens in clinical samples.
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Affiliation(s)
| | | | | | | | | | | | | | - Alban Ramette
- Institute for Infectious Diseases, University of Bern, Friedbühlstrasse 25, 3001 Bern, Switzerland
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2
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Nosková A, Mehrotra A, Kadri NK, Lloret-Villas A, Neuenschwander S, Hofer A, Pausch H. Comparison of two multi-trait association testing methods and sequence-based fine mapping of six additive QTL in Swiss Large White pigs. BMC Genomics 2023; 24:192. [PMID: 37038103 PMCID: PMC10084639 DOI: 10.1186/s12864-023-09295-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 04/04/2023] [Indexed: 04/12/2023] Open
Abstract
BACKGROUND Genetic correlations between complex traits suggest that pleiotropic variants contribute to trait variation. Genome-wide association studies (GWAS) aim to uncover the genetic underpinnings of traits. Multivariate association testing and the meta-analysis of summary statistics from single-trait GWAS enable detecting variants associated with multiple phenotypes. In this study, we used array-derived genotypes and phenotypes for 24 reproduction, production, and conformation traits to explore differences between the two methods and used imputed sequence variant genotypes to fine-map six quantitative trait loci (QTL). RESULTS We considered genotypes at 44,733 SNPs for 5,753 pigs from the Swiss Large White breed that had deregressed breeding values for 24 traits. Single-trait association analyses revealed eleven QTL that affected 15 traits. Multi-trait association testing and the meta-analysis of the single-trait GWAS revealed between 3 and 6 QTL, respectively, in three groups of traits. The multi-trait methods revealed three loci that were not detected in the single-trait GWAS. Four QTL that were identified in the single-trait GWAS, remained undetected in the multi-trait analyses. To pinpoint candidate causal variants for the QTL, we imputed the array-derived genotypes to the sequence level using a sequenced reference panel consisting of 421 pigs. This approach provided genotypes at 16 million imputed sequence variants with a mean accuracy of imputation of 0.94. The fine-mapping of six QTL with imputed sequence variant genotypes revealed four previously proposed causal mutations among the top variants. CONCLUSIONS Our findings in a medium-size cohort of pigs suggest that multivariate association testing and the meta-analysis of summary statistics from single-trait GWAS provide very similar results. Although multi-trait association methods provide a useful overview of pleiotropic loci segregating in mapping populations, the investigation of single-trait association studies is still advised, as multi-trait methods may miss QTL that are uncovered in single-trait GWAS.
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Affiliation(s)
- A Nosková
- ETH Zürich, Universitätstrasse 2, 8092, Zürich, Switzerland.
| | - A Mehrotra
- ETH Zürich, Universitätstrasse 2, 8092, Zürich, Switzerland
| | - N K Kadri
- ETH Zürich, Universitätstrasse 2, 8092, Zürich, Switzerland
| | | | | | - A Hofer
- SUISAG, Allmend 10, 6204, Sempach, Switzerland
| | - H Pausch
- ETH Zürich, Universitätstrasse 2, 8092, Zürich, Switzerland
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Wegner F, Roloff T, Huber M, Cordey S, Ramette A, Gerth Y, Bertelli C, Stange M, Seth-Smith HMB, Mari A, Leuzinger K, Cerutti L, Harshman K, Xenarios I, Le Mercier P, Bittel P, Neuenschwander S, Opota O, Fuchs J, Panning M, Michel C, Hallin M, Demuyser T, De Mendonca R, Savelkoul P, Dingemans J, van der Veer B, Boers SA, Claas ECJ, Coolen JPM, Melchers WJG, Gunell M, Kallonen T, Vuorinen T, Hakanen AJ, Bernhoff E, Hetland MAK, Golan Berman H, Adar S, Moran-Gilad J, Wolf DG, Leib SL, Nolte O, Kaiser L, Schmutz S, Kufner V, Zaheri M, Trkola A, Aamot HV, Hirsch HH, Greub G, Egli A. External Quality Assessment of SARS-CoV-2 Sequencing: an ESGMD-SSM Pilot Trial across 15 European Laboratories. J Clin Microbiol 2022; 60:e0169821. [PMID: 34757834 PMCID: PMC8769736 DOI: 10.1128/jcm.01698-21] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 11/05/2021] [Indexed: 12/01/2022] Open
Abstract
This first pilot trial on external quality assessment (EQA) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) whole-genome sequencing, initiated by the European Society of Clinical Microbiology and Infectious Diseases (ESCMID) Study Group for Genomic and Molecular Diagnostics (ESGMD) and the Swiss Society for Microbiology (SSM), aims to build a framework between laboratories in order to improve pathogen surveillance sequencing. Ten samples with various viral loads were sent out to 15 clinical laboratories that had free choice of sequencing methods and bioinformatic analyses. The key aspects on which the individual centers were compared were the identification of (i) single nucleotide polymorphisms (SNPs) and indels, (ii) Pango lineages, and (iii) clusters between samples. The participating laboratories used a wide array of methods and analysis pipelines. Most were able to generate whole genomes for all samples. Genomes were sequenced to various depths (up to a 100-fold difference across centers). There was a very good consensus regarding the majority of reporting criteria, but there were a few discrepancies in lineage and cluster assignments. Additionally, there were inconsistencies in variant calling. The main reasons for discrepancies were missing data, bioinformatic choices, and interpretation of data. The pilot EQA was overall a success. It was able to show the high quality of participating laboratories and provide valuable feedback in cases where problems occurred, thereby improving the sequencing setup of laboratories. A larger follow-up EQA should, however, improve on defining the variables and format of the report. Additionally, contamination and/or minority variants should be a further aspect of assessment.
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Affiliation(s)
- Fanny Wegner
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Bacteriology and Mycology, University Hospital Basel, Basel, Switzerland
- Swiss Institute of Bioinformatics, Basel, Switzerland
| | - Tim Roloff
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Bacteriology and Mycology, University Hospital Basel, Basel, Switzerland
- Swiss Institute of Bioinformatics, Basel, Switzerland
| | - Michael Huber
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Samuel Cordey
- Laboratory of Virology, University Hospital Geneva, Geneva, Switzerland
| | - Alban Ramette
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Yannick Gerth
- Center for Laboratory Medicine, Saint Gall, Switzerland
| | - Claire Bertelli
- Institute of Microbiology, Lausanne University Hospital, Lausanne, Switzerland
- Institute of Microbiology, University of Lausanne, Lausanne, Switzerland
| | - Madlen Stange
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Bacteriology and Mycology, University Hospital Basel, Basel, Switzerland
- Swiss Institute of Bioinformatics, Basel, Switzerland
| | - Helena M. B. Seth-Smith
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Bacteriology and Mycology, University Hospital Basel, Basel, Switzerland
- Swiss Institute of Bioinformatics, Basel, Switzerland
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Alfredo Mari
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Bacteriology and Mycology, University Hospital Basel, Basel, Switzerland
- Swiss Institute of Bioinformatics, Basel, Switzerland
| | - Karoline Leuzinger
- Clinical Virology, University Hospital Basel, Basel, Switzerland
- Transplantation and Clinical Virology, Department of Biomedicine, University of Basel, Basel, Switzerland
| | | | | | | | | | - Pascal Bittel
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | | | - Onya Opota
- Institute of Microbiology, Lausanne University Hospital, Lausanne, Switzerland
- Institute of Microbiology, University of Lausanne, Lausanne, Switzerland
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Jonas Fuchs
- Institute of Virology, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Marcus Panning
- Institute of Virology, Medical Center-University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Charlotte Michel
- Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles, Brussels, Belgium
| | - Marie Hallin
- Department of Microbiology, Laboratoire Hospitalier Universitaire de Bruxelles, Brussels, Belgium
| | - Thomas Demuyser
- Department of Microbiology and Infection Control, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Brussels, Belgium
| | | | - Paul Savelkoul
- Department of Medical Microbiology, Maastricht University, Maastricht, Netherlands
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Jozef Dingemans
- Department of Medical Microbiology, Maastricht University, Maastricht, Netherlands
| | - Brian van der Veer
- Department of Medical Microbiology, Maastricht University, Maastricht, Netherlands
| | - Stefan A. Boers
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, Netherlands
| | - Eric C. J. Claas
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, Netherlands
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Jordy P. M. Coolen
- Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, Netherlands
| | - Willem J. G. Melchers
- Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, Netherlands
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Marianne Gunell
- Department of Clinical Microbiology, Turku University Hospital, Turku, Finland
- Department of Clinical Microbiology, University of Turku, Turku, Finland
| | - Teemu Kallonen
- Department of Clinical Microbiology, Turku University Hospital, Turku, Finland
- Department of Clinical Microbiology, University of Turku, Turku, Finland
| | - Tytti Vuorinen
- Department of Clinical Microbiology, Turku University Hospital, Turku, Finland
- Department of Clinical Microbiology, University of Turku, Turku, Finland
| | - Antti J. Hakanen
- Department of Clinical Microbiology, Turku University Hospital, Turku, Finland
- Department of Clinical Microbiology, University of Turku, Turku, Finland
| | - Eva Bernhoff
- Department of Medical Microbiology, Stavanger University Hospital, Stavanger, Norway
| | | | - Hadar Golan Berman
- Clinical Virology Unit, Department of Clinical Microbiology and Infectious Diseases, Hadassah University Hospital, Jerusalem, Israel
- Department of Microbiology and Molecular Genetics, Institute for Medical Research Israel Canada, The Hebrew University Faculty of Medicine, Jerusalem, Israel
| | - Sheera Adar
- Department of Microbiology and Molecular Genetics, Institute for Medical Research Israel Canada, The Hebrew University Faculty of Medicine, Jerusalem, Israel
| | - Jacob Moran-Gilad
- School of Public Health, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Dana G. Wolf
- Clinical Virology Unit, Department of Clinical Microbiology and Infectious Diseases, Hadassah University Hospital, Jerusalem, Israel
- Lautenberg Center for General and Tumor Immunology, The Hebrew University Faculty of Medicine, Jerusalem, Israel
| | - Stephen L. Leib
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Oliver Nolte
- Center for Laboratory Medicine, Saint Gall, Switzerland
| | - Laurent Kaiser
- Laboratory of Virology, University Hospital Geneva, Geneva, Switzerland
| | - Stefan Schmutz
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Verena Kufner
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Maryam Zaheri
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Alexandra Trkola
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Hege Vangstein Aamot
- Department of Microbiology and Infection Control, Akershus University Hospital, Lørenskog, Norway
- Department of Clinical Molecular Biology (EPIGEN), Akershus University Hospital and University of Oslo, Lørenskog, Norway
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Hans H. Hirsch
- Transplantation and Clinical Virology, Department of Biomedicine, University of Basel, Basel, Switzerland
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
- Infectious Diseases and Hospital Epidemiology, University of Basel, Basel, Switzerland
| | - Gilbert Greub
- Institute of Microbiology, Lausanne University Hospital, Lausanne, Switzerland
- Institute of Microbiology, University of Lausanne, Lausanne, Switzerland
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
| | - Adrian Egli
- Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
- Clinical Bacteriology and Mycology, University Hospital Basel, Basel, Switzerland
- ESCMID Study Group for Genomic and Molecular Diagnostics (ESGMD), Basel, Switzerland
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Nosková A, Hiltpold M, Janett F, Echtermann T, Fang ZH, Sidler X, Selige C, Hofer A, Neuenschwander S, Pausch H. Infertility due to defective sperm flagella caused by an intronic deletion in DNAH17 that perturbs splicing. Genetics 2021; 217:6041611. [PMID: 33724408 DOI: 10.1093/genetics/iyaa033] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 12/08/2020] [Indexed: 12/30/2022] Open
Abstract
Artificial insemination in pig (Sus scrofa domesticus) breeding involves the evaluation of the semen quality of breeding boars. Ejaculates that fulfill predefined quality requirements are processed, diluted and used for inseminations. Within short time, eight Swiss Large White boars producing immotile sperm that had multiple morphological abnormalities of the sperm flagella were noticed at a semen collection center. The eight boars were inbred on a common ancestor suggesting that the novel sperm flagella defect is a recessive trait. Transmission electron microscopy cross-sections revealed that the immotile sperm had disorganized flagellar axonemes. Haplotype-based association testing involving microarray-derived genotypes at 41,094 SNPs of six affected and 100 fertile boars yielded strong association (P = 4.22 × 10-15) at chromosome 12. Autozygosity mapping enabled us to pinpoint the causal mutation on a 1.11 Mb haplotype located between 3,473,632 and 4,587,759 bp. The haplotype carries an intronic 13-bp deletion (Chr12:3,556,401-3,556,414 bp) that is compatible with recessive inheritance. The 13-bp deletion excises the polypyrimidine tract upstream exon 56 of DNAH17 (XM_021066525.1: c.8510-17_8510-5del) encoding dynein axonemal heavy chain 17. Transcriptome analysis of the testis of two affected boars revealed that the loss of the polypyrimidine tract causes exon skipping which results in the in-frame loss of 89 amino acids from DNAH17. Disruption of DNAH17 impairs the assembly of the flagellar axoneme and manifests in multiple morphological abnormalities of the sperm flagella. Direct gene testing may now be implemented to monitor the defective allele in the Swiss Large White population and prevent the frequent manifestation of a sterilizing sperm tail disorder in breeding boars.
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Affiliation(s)
- Adéla Nosková
- Animal Genomics, Institute of Agricultural Sciences, ETH Zürich, 8315 Lindau, Switzerland
| | - Maya Hiltpold
- Animal Genomics, Institute of Agricultural Sciences, ETH Zürich, 8315 Lindau, Switzerland
| | - Fredi Janett
- Clinic of Reproductive Medicine, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Thomas Echtermann
- Division of Swine Medicine, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | - Zih-Hua Fang
- Animal Genomics, Institute of Agricultural Sciences, ETH Zürich, 8315 Lindau, Switzerland
| | - Xaver Sidler
- Division of Swine Medicine, Vetsuisse Faculty, University of Zurich, 8057 Zurich, Switzerland
| | | | | | - Stefan Neuenschwander
- Animal Genetics, Institute of Agricultural Science, ETH Zürich, 8092 Zürich, Switzerland
| | - Hubert Pausch
- Animal Genomics, Institute of Agricultural Sciences, ETH Zürich, 8315 Lindau, Switzerland
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5
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Nosková A, Bhati M, Kadri NK, Crysnanto D, Neuenschwander S, Hofer A, Pausch H. Characterization of a haplotype-reference panel for genotyping by low-pass sequencing in Swiss Large White pigs. BMC Genomics 2021; 22:290. [PMID: 33882824 PMCID: PMC8061004 DOI: 10.1186/s12864-021-07610-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 04/13/2021] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND The key-ancestor approach has been frequently applied to prioritize individuals for whole-genome sequencing based on their marginal genetic contribution to current populations. Using this approach, we selected 70 key ancestors from two lines of the Swiss Large White breed that have been selected divergently for fertility and fattening traits and sequenced their genomes with short paired-end reads. RESULTS Using pedigree records, we estimated the effective population size of the dam and sire line to 72 and 44, respectively. In order to assess sequence variation in both lines, we sequenced the genomes of 70 boars at an average coverage of 16.69-fold. The boars explained 87.95 and 95.35% of the genetic diversity of the breeding populations of the dam and sire line, respectively. Reference-guided variant discovery using the GATK revealed 26,862,369 polymorphic sites. Principal component, admixture and fixation index (FST) analyses indicated considerable genetic differentiation between the lines. Genomic inbreeding quantified using runs of homozygosity was higher in the sire than dam line (0.28 vs 0.26). Using two complementary approaches, we detected 51 signatures of selection. However, only six signatures of selection overlapped between both lines. We used the sequenced haplotypes of the 70 key ancestors as a reference panel to call 22,618,811 genotypes in 175 pigs that had been sequenced at very low coverage (1.11-fold) using the GLIMPSE software. The genotype concordance, non-reference sensitivity and non-reference discrepancy between thus inferred and Illumina PorcineSNP60 BeadChip-called genotypes was 97.60, 98.73 and 3.24%, respectively. The low-pass sequencing-derived genomic relationship coefficients were highly correlated (r > 0.99) with those obtained from microarray genotyping. CONCLUSIONS We assessed genetic diversity within and between two lines of the Swiss Large White pig breed. Our analyses revealed considerable differentiation, even though the split into two populations occurred only few generations ago. The sequenced haplotypes of the key ancestor animals enabled us to implement genotyping by low-pass sequencing which offers an intriguing cost-effective approach to increase the variant density over current array-based genotyping by more than 350-fold.
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Affiliation(s)
- Adéla Nosková
- Animal Genomics, ETH Zürich, Eschikon 27, 8315, Lindau, Switzerland.
| | - Meenu Bhati
- Animal Genomics, ETH Zürich, Eschikon 27, 8315, Lindau, Switzerland
| | | | - Danang Crysnanto
- Animal Genomics, ETH Zürich, Eschikon 27, 8315, Lindau, Switzerland
| | | | | | - Hubert Pausch
- Animal Genomics, ETH Zürich, Eschikon 27, 8315, Lindau, Switzerland
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6
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Dylus D, Pillonel T, Opota O, Wüthrich D, Seth-Smith HMB, Egli A, Leo S, Lazarevic V, Schrenzel J, Laurent S, Bertelli C, Blanc DS, Neuenschwander S, Ramette A, Falquet L, Imkamp F, Keller PM, Kahles A, Oberhaensli S, Barbié V, Dessimoz C, Greub G, Lebrand A. NGS-Based S. aureus Typing and Outbreak Analysis in Clinical Microbiology Laboratories: Lessons Learned From a Swiss-Wide Proficiency Test. Front Microbiol 2020; 11:591093. [PMID: 33424794 PMCID: PMC7793906 DOI: 10.3389/fmicb.2020.591093] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/19/2020] [Indexed: 12/31/2022] Open
Abstract
Whole genome sequencing (WGS) enables high resolution typing of bacteria up to the single nucleotide polymorphism (SNP) level. WGS is used in clinical microbiology laboratories for infection control, molecular surveillance and outbreak analyses. Given the large palette of WGS reagents and bioinformatics tools, the Swiss clinical bacteriology community decided to conduct a ring trial (RT) to foster harmonization of NGS-based bacterial typing. The RT aimed at assessing methicillin-susceptible Staphylococcus aureus strain relatedness from WGS and epidemiological data. The RT was designed to disentangle the variability arising from differences in sample preparation, SNP calling and phylogenetic methods. Nine laboratories participated. The resulting phylogenetic tree and cluster identification were highly reproducible across the laboratories. Cluster interpretation was, however, more laboratory dependent, suggesting that an increased sharing of expertise across laboratories would contribute to further harmonization of practices. More detailed bioinformatic analyses unveiled that while similar clusters were found across laboratories, these were actually based on different sets of SNPs, differentially retained after sample preparation and SNP calling procedures. Despite this, the observed number of SNP differences between pairs of strains, an important criterion to determine strain relatedness given epidemiological information, was similar across pipelines for closely related strains when restricting SNP calls to a common core genome defined by S. aureus cgMLST schema. The lessons learned from this pilot study will serve the implementation of larger-scale RT, as a mean to have regular external quality assessments for laboratories performing WGS analyses in a clinical setting.
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Affiliation(s)
- David Dylus
- Department of Computational Biology, University of Lausanne, Lausanne, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.,SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Trestan Pillonel
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Onya Opota
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Daniel Wüthrich
- Division of Clinical Bacteriology and Mycology, University Hospital of Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Helena M B Seth-Smith
- Division of Clinical Bacteriology and Mycology, University Hospital of Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Adrian Egli
- Division of Clinical Bacteriology and Mycology, University Hospital of Basel, Basel, Switzerland.,Applied Microbiology Research, Department of Biomedicine, University of Basel, Basel, Switzerland
| | - Stefano Leo
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Genetics Laboratory Medicine and Pathology, Geneva University Hospitals, Geneva, Switzerland
| | - Vladimir Lazarevic
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Genetics Laboratory Medicine and Pathology, Geneva University Hospitals, Geneva, Switzerland
| | - Jacques Schrenzel
- Bacteriology Laboratory, Division of Laboratory Medicine, Department of Genetics Laboratory Medicine and Pathology, Geneva University Hospitals, Geneva, Switzerland
| | - Sacha Laurent
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Claire Bertelli
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Dominique S Blanc
- Service of Hospital Preventive Medicine, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | | | - Alban Ramette
- Institute for Infectious Diseases, University of Bern, Bern, Switzerland
| | - Laurent Falquet
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Department of Biology, University of Fribourg, Fribourg, Switzerland
| | - Frank Imkamp
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Peter M Keller
- Institute of Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Andre Kahles
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Biomedical Informatics, Swiss Federal Institute of Technology (ETH Zürich), ETH Zürich, Zurich, Switzerland
| | - Simone Oberhaensli
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Interfaculty Bioinformatics Unit, University of Bern, Bern, Switzerland
| | - Valérie Barbié
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Christophe Dessimoz
- Department of Computational Biology, University of Lausanne, Lausanne, Switzerland.,Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.,SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland.,Department of Genetics, Evolution and Environment, University College London, London, United Kingdom.,Department of Computer Science, University College London, London, United Kingdom
| | - Gilbert Greub
- Institute of Microbiology, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland
| | - Aitana Lebrand
- SIB Swiss Institute of Bioinformatics, Lausanne, Switzerland
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7
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Grädel C, Terrazos Miani MA, Baumann C, Barbani MT, Neuenschwander S, Leib SL, Suter-Riniker F, Ramette A. Whole-Genome Sequencing of Human Enteroviruses from Clinical Samples by Nanopore Direct RNA Sequencing. Viruses 2020; 12:v12080841. [PMID: 32752120 PMCID: PMC7472277 DOI: 10.3390/v12080841] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 12/14/2022] Open
Abstract
Enteroviruses are small RNA viruses that affect millions of people each year by causing an important burden of disease with a broad spectrum of symptoms. In routine diagnostic laboratories, enteroviruses are identified by PCR-based methods, often combined with partial sequencing for genotyping. In this proof-of-principle study, we assessed direct RNA sequencing (DRS) using nanopore sequencing technology for fast whole-genome sequencing of viruses directly from clinical samples. The approach was complemented by sequencing the corresponding viral cDNA via Illumina MiSeq sequencing. DRS of total RNA extracted from three different enterovirus-positive stool samples produced long RNA fragments, covering between 59% and 99.6% of the most similar reference genome sequences. The identification of the enterovirus sequences in the samples was confirmed by short-read cDNA sequencing. Sequence identity between DRS and Illumina MiSeq enterovirus consensus sequences ranged between 94% and 97%. Here, we show that nanopore DRS can be used to correctly identify enterovirus genotypes from patient stool samples with high viral load and that the approach also provides rich metatranscriptomic information on sample composition for all life domains.
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Affiliation(s)
- Carole Grädel
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
- Graduate School for Cellular and Biomedical Sciences, University of Bern, 3012 Bern, Switzerland
| | - Miguel A. Terrazos Miani
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
| | - Christian Baumann
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
| | - Maria Teresa Barbani
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
| | - Stefan Neuenschwander
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
| | - Stephen L. Leib
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
| | - Franziska Suter-Riniker
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
| | - Alban Ramette
- Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland; (C.G.); (M.A.T.M.); (C.B.); (M.T.B.); (S.N.); (S.L.L.); (F.S.-R.)
- Correspondence: ; Tel.: +41-31-632-9540
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8
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Fang ZH, Nosková A, Crysnanto D, Neuenschwander S, Vögeli P, Pausch H. A 63-bp insertion in exon 2 of the porcine KIF21A gene is associated with arthrogryposis multiplex congenita. Anim Genet 2020; 51:820-823. [PMID: 32686171 DOI: 10.1111/age.12984] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 06/05/2020] [Accepted: 06/22/2020] [Indexed: 12/30/2022]
Abstract
A recessive form of arthrogryposis multiplex congenita (AMC) was detected 20 years ago in the Swiss Large White (SLW) pig population. A diagnostic marker test enabled the identification of carrier animals, but the underlying causal mutation remains unknown. To identify the mutation underlying AMC, we collected SNP chip genotyping data for 11 affected piglets and 23 healthy pigs. Association testing using 47 829 SNPs confirmed that AMC maps to SSC5 (P = 9.4 × 10-13 ). Subsequent autozygosity mapping revealed a common 6.06 Mb region (from 66 757 970 to 72 815 151 bp) of extended homozygosity in 11 piglets affected by AMC. Using WGS data, we detected a 63-bp insertion compatible with the recessive inheritance of AMC in the second exon of KIF21A gene encoding Kinesin Family Member 21A. The 63-bp insertion is predicted to introduce a premature stop codon in KIF21A gene (p.Val41_Phe42insTer) that truncates 1614 amino acids (~97%) from the protein. We found that this deleterious allele still segregates at a frequency of 0.1% in the SLW pig population. Carrier animals can now be detected unambiguously and excluded from breeding.
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Affiliation(s)
- Z-H Fang
- Animal Genomics, Institute of Agricultural Science, D-USYS, ETH Zürich, Zürich, 8092, Switzerland
| | - A Nosková
- Animal Genomics, Institute of Agricultural Science, D-USYS, ETH Zürich, Zürich, 8092, Switzerland
| | - D Crysnanto
- Animal Genomics, Institute of Agricultural Science, D-USYS, ETH Zürich, Zürich, 8092, Switzerland
| | - S Neuenschwander
- Animal Genetics unit, Institute of Agricultural Science, D-USYS, ETH Zürich, Zürich, 8092, Switzerland
| | - P Vögeli
- Animal Genetics unit, Institute of Agricultural Science, D-USYS, ETH Zürich, Zürich, 8092, Switzerland
| | - H Pausch
- Animal Genomics, Institute of Agricultural Science, D-USYS, ETH Zürich, Zürich, 8092, Switzerland
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9
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Girard M, Hu D, Pradervand N, Neuenschwander S, Bee G. Chestnut extract but not sodium salicylate decreases the severity of diarrhea and enterotoxigenic Escherichia coli F4 shedding in artificially infected piglets. PLoS One 2020; 15:e0214267. [PMID: 32106264 PMCID: PMC7046202 DOI: 10.1371/journal.pone.0214267] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 01/16/2020] [Indexed: 01/16/2023] Open
Abstract
The development of alternatives to antibiotics is crucial to limiting the incidence of antimicrobial resistance, especially in prophylactic and metaphylactic use to control post-weaning diarrhea (PWD). Feed additives, including bioactive compounds, could be a promising alternative. This study aimed to test two bioactive compounds, sodium salicylate (SA) and a chestnut extract (CE) containing hydrolysable tannins, on the occurrence of PWD. At weaning, 72 piglets were assigned to four treatments that combined two factors: CE supplementation (with 2% of CE (CE+) or without (CE-)) and SA supplementation (with 35 mg/kg BW of SA (SA+) or without (SA-)). Then, 4 days after weaning, all piglets were infected with a suspension at 108 CFU/ml of enterotoxigenic Escherichia coli (ETEC F4ac). Each piglet had free access to an electrolyte solution containing, or not, SA. This SA supplementation was administered for 5 days (i.e., from the day of infection (day 0) to 4 days post-infection (day 4). During the 2 weeks post-infection, supplementation with SA had no effect (P > 0.05) on growth performances nor on fecal scores. A significant SA × time interaction (P < 0.01) for fecal scores and the percentage of diarrhea indicated that piglets with SA did not recover faster and did have a second episode of diarrhea. In contrast to SA treatment, inclusion of CE increased (P < 0.05) growth performances and feed intake. In the first week post-infection, CE decreased (P < 0.001) the overall fecal scores, the percentage of piglets with diarrhea, the days in diarrhea, and ETEC shedding in the feces. There was a SA×CE interaction (P < 0.05) for ETEC shedding, suggesting a negative effect of combining SA with CE. This study highlighted that, in contrast to SA, CE could represent a promising alternative to antibiotics immediately after weaning for improving growth performance and reducing PWD.
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Affiliation(s)
- M. Girard
- Agroscope, Posieux, Fribourg, Switzerland
| | - D. Hu
- Institute of Agricultural Sciences, ETH Zürich, Zürich, Switzerland
| | | | | | - G. Bee
- Agroscope, Posieux, Fribourg, Switzerland
- * E-mail:
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10
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Hu D, Rampoldi A, Bratus-Neuenschwander A, Hofer A, Bertschinger HU, Vögeli P, Neuenschwander S. Effective genetic markers for identifying the Escherichia coli F4ac receptor status of pigs. Anim Genet 2019; 50:136-142. [PMID: 30724375 DOI: 10.1111/age.12770] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/13/2018] [Indexed: 11/28/2022]
Abstract
The F4ac receptor locus (F4acR), which encodes susceptibility or resistance to Escherichia coli diarrhoea, is inherited as an autosomal recessive monogenetic trait. F4acR is localized on pig chromosome 13 (SSC13q41-q44) near the MUC13 gene. Two flanking markers (CHCF1 and ALGA0106330) with a high linkage disequilibrium (LD) with F4acR were found to be effective for the genetic identification of F4ac-resistant pigs in the Swiss Large White breed (one recombinant out of 2034 genotyped pigs). Three recombinant boars, one each from the Duroc, Swiss Landrace and Piétrain breeds, were genotyped with seven different markers and phenotyped by means of a microscopic adhesion test. Only ALGA0072075, CHCF1 and CHCF3 indicated the correct phenotype. To test the effect of the resistance allele on production traits, 530 Large White pigs from the national test station were investigated. A significant difference existed among the F4acR locus genotypes in the intramuscular fat content of the longissimus dorsi muscle, whereas no other production traits were influenced by the resistance allele. The frequency of the CHCF1-C and ALGA0106330-A alleles associated with resistance in the Swiss Large White population was 60%, which is advantageous for implementing this trait in a breeding programme to select for E. coli F4ac-resistant animals. The selection of resistant pigs should start on the male side due to the inability of resistant sows to produce sufficient amounts of protecting antibodies in the colostrum. Selection of genetically F4ac-resistant pigs is a sustainable and suitable alternative to decreasing animal loss and antibiotic use due to diarrhoea.
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Affiliation(s)
- D Hu
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland
| | - A Rampoldi
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland
| | | | - A Hofer
- SUISAG, Allmend 8, 6204 Sempach, Switzerland
| | - H U Bertschinger
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland
| | - P Vögeli
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland
| | - S Neuenschwander
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland
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11
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Neuenschwander S, Kissling-Albrecht L, Heiniger J, Backfisch W, Stranzinger G, Pliška V. Inherited Defect of Blood Clotting Factor VIII (Haemophilia A) in Sheep. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1646328] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- S Neuenschwander
- Department of Animal Science Swiss, Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland
| | - L Kissling-Albrecht
- Department of Animal Science Swiss, Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland
| | - J Heiniger
- Department of Animal Science Swiss, Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland
| | - W Backfisch
- Department of Animal Science Swiss, Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland
| | - G Stranzinger
- Department of Animal Science Swiss, Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland
| | - V Pliška
- Department of Animal Science Swiss, Federal Institute of Technology (ETH), CH-8092 Zürich, Switzerland
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12
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Zhou X, Stevens MJA, Neuenschwander S, Schwarm A, Kreuzer M, Bratus-Neuenschwander A, Zeitz JO. The transcriptome response of the ruminal methanogen Methanobrevibacter ruminantium strain M1 to the inhibitor lauric acid. BMC Res Notes 2018; 11:135. [PMID: 29454387 PMCID: PMC5816558 DOI: 10.1186/s13104-018-3242-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 02/09/2018] [Indexed: 01/08/2023] Open
Abstract
Objective Lauric acid (C12) is a medium-chain fatty acid that inhibits growth and production of the greenhouse gas methane by rumen methanogens such as Methanobrevibacter ruminantium. To understand the inhibitory mechanism of C12, a transcriptome analysis was performed in M. ruminantium strain M1 (DSM 1093) using RNA-Seq. Results Pure cell cultures in the exponential growth phase were treated with 0.4 mg/ml C12, dissolved in dimethyl sulfoxide (DMSO), for 1 h and transcriptomic changes were compared to DMSO-only treated cells (final DMSO concentration 0.2%). Exposure to C12 resulted in differential expression of 163 of the 2280 genes in the M1 genome (maximum log2-fold change 6.6). Remarkably, C12 hardly affected the expression of genes involved in methanogenesis. Instead, most affected genes encode cell-surface associated proteins (adhesion-like proteins, membrane-associated transporters and hydrogenases), and proteins involved in detoxification or DNA-repair processes. Enrichment analysis on the genes regulated in the C12-treated group showed a significant enrichment for categories ‘cell surface’ and ‘mobile elements’ (activated by C12), and for the categories ‘regulation’ and ‘protein fate’ (represssed). These results are useful to generate and test specific hypotheses on the mechanism how C12 affects rumen methanogens. Electronic supplementary material The online version of this article (10.1186/s13104-018-3242-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Xuan Zhou
- Institute of Agricultural Sciences, ETH Zurich, Universitätstrasse 2, 8092, Zurich, Switzerland
| | - Marc J A Stevens
- Laboratory of Food Biotechnology, Institute of Food, Nutrition and Health, ETH Zurich, Schmelzbergstrasse 7, 8092, Zurich, Switzerland.,Institute for Food Hygiene and Safety, University of Zurich, Winterthurerstrasse 272, 8057, Zurich, Switzerland
| | - Stefan Neuenschwander
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland
| | - Angela Schwarm
- Institute of Agricultural Sciences, ETH Zurich, Universitätstrasse 2, 8092, Zurich, Switzerland
| | - Michael Kreuzer
- Institute of Agricultural Sciences, ETH Zurich, Universitätstrasse 2, 8092, Zurich, Switzerland
| | - Anna Bratus-Neuenschwander
- Institute of Agricultural Sciences, ETH Zurich, Tannenstrasse 1, 8092, Zurich, Switzerland.,Functional Genomics Center Zurich, ETH Zurich and University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Johanna O Zeitz
- Institute of Agricultural Sciences, ETH Zurich, Universitätstrasse 2, 8092, Zurich, Switzerland. .,Institute of Animal Nutrition and Nutritional Physiology, Justus-Liebig University Giessen, 35392, Giessen, Germany.
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13
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Cavoto E, Neuenschwander S, Goudet J, Perrin N. Sex-antagonistic genes, XY recombination and feminized Y chromosomes. J Evol Biol 2018; 31:416-427. [DOI: 10.1111/jeb.13235] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Revised: 12/18/2017] [Accepted: 12/20/2017] [Indexed: 01/20/2023]
Affiliation(s)
- E. Cavoto
- Department of Ecology and Evolution; University of Lausanne; Lausanne Switzerland
| | - S. Neuenschwander
- Department of Ecology and Evolution; University of Lausanne; Lausanne Switzerland
- Vital-IT; Swiss Institute of Bioinformatics; Lausanne Switzerland
| | - J. Goudet
- Department of Ecology and Evolution; University of Lausanne; Lausanne Switzerland
- Swiss Institute of Bioinformatics; Lausanne Switzerland
| | - N. Perrin
- Department of Ecology and Evolution; University of Lausanne; Lausanne Switzerland
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Butty AM, Frischknecht M, Gredler B, Neuenschwander S, Moll J, Bieber A, Baes CF, Seefried FR. Genetic and genomic analysis of hyperthelia in Brown Swiss cattle. J Dairy Sci 2017; 100:402-411. [DOI: 10.3168/jds.2016-11420] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Accepted: 09/30/2016] [Indexed: 12/13/2022]
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15
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Butty AM, Frischknecht M, Gredler B, Baes C, Neuenschwander S, Moll J, Bieber A, Seefried F. 0327 Genome-wide association study for supernumerary teats in Swiss Brown Swiss Cattle reveals LGR5 as a major gene on chromosome 5. J Anim Sci 2016. [DOI: 10.2527/jam2016-0327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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16
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Simandoux S, Neuenschwander S, Campana F, Alran S. Un exemple de mise en place du PPAC dans un établissement de soin. ONCOLOGIE 2016. [DOI: 10.1007/s10269-016-2596-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Gay F, Pavia Y, Pierrat N, Lasalle S, Neuenschwander S, Brisse HJ. Dose reduction with adaptive statistical iterative reconstruction for paediatric CT: phantom study and clinical experience on chest and abdomen CT. Eur Radiol 2013; 24:102-11. [DOI: 10.1007/s00330-013-2982-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Revised: 07/03/2013] [Accepted: 07/17/2013] [Indexed: 01/21/2023]
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18
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Haubitz M, Neuenschwander S, Vögeli P. Porcine arthrogryposis multiplex congenita (AMC): New diagnostic test and narrowed candidate region. Mol Cell Probes 2012; 26:248-52. [DOI: 10.1016/j.mcp.2012.02.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Revised: 01/27/2012] [Accepted: 02/28/2012] [Indexed: 10/28/2022]
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Delplancke M, Alvarez N, Benoit L, Espíndola A, I Joly H, Neuenschwander S, Arrigo N. Evolutionary history of almond tree domestication in the Mediterranean basin. Mol Ecol 2012. [PMID: 23189975 DOI: 10.1111/mec.12129] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Genetic diversity of contemporary domesticated species is shaped by both natural and human-driven processes. However, until now, little is known about how domestication has imprinted the variation of fruit tree species. In this study, we reconstruct the recent evolutionary history of the domesticated almond tree, Prunus dulcis, around the Mediterranean basin, using a combination of nuclear and chloroplast microsatellites [i.e. simple sequence repeat (SSRs)] to investigate patterns of genetic diversity. Whereas conservative chloroplast SSRs show a widespread haplotype and rare locally distributed variants, nuclear SSRs show a pattern of isolation by distance with clines of diversity from the East to the West of the Mediterranean basin, while Bayesian genetic clustering reveals a substantial longitudinal genetic structure. Both kinds of markers thus support a single domestication event, in the eastern side of the Mediterranean basin. In addition, model-based estimation of the timing of genetic divergence among those clusters is estimated sometime during the Holocene, a result that is compatible with human-mediated dispersal of almond tree out of its centre of origin. Still, the detection of region-specific alleles suggests that gene flow from relictual wild preglacial populations (in North Africa) or from wild counterparts (in the Near East) could account for a fraction of the diversity observed.
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Affiliation(s)
- M Delplancke
- Centre d'Ecologie Fonctionnelle et Evolutive, UMR 5175, 1919 Route de Mende, 34293 Montpellier Cedex 5, France.
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20
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Carroll L, Friedli P, Neuenschwander S, Sigg H, Cecchi S, Isa F, Chrastina D, Isella G, Fedoryshyn Y, Faist J. Direct-gap gain and optical absorption in germanium correlated to the density of photoexcited carriers, doping, and strain. Phys Rev Lett 2012; 109:057402. [PMID: 23006206 DOI: 10.1103/physrevlett.109.057402] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Indexed: 06/01/2023]
Abstract
Direct-gap gain up to 850 cm(-1) at 0.74 eV is measured and modeled in optically pumped Ge-on-Si layers for photoexcited carrier densities of 2.0 × 10(20) cm(-3). The gain spectra are correlated to carrier density via plasma-frequency determinations from reflection spectra. Despite significant gain, optical amplification cannot take place, because the carriers also generate pump-induced absorption of ≈7000 cm(-1). Parallel studies of III-V direct-gap InGaAs layers validate our spectroscopy and modeling. Our self-consistent results contradict current explanations of lasing in Ge-on-Si cavities.
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Affiliation(s)
- Lee Carroll
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Villigen, Switzerland
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21
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Jacobsen M, Cirera S, Joller D, Esteso G, Kracht SS, Edfors I, Bendixen C, Archibald AL, Vogeli P, Neuenschwander S, Bertschinger HU, Rampoldi A, Andersson L, Fredholm M, Jørgensen CB. Characterisation of five candidate genes within the ETEC F4ab/ac candidate region in pigs. BMC Res Notes 2011; 4:225. [PMID: 21718470 PMCID: PMC3160978 DOI: 10.1186/1756-0500-4-225] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 06/30/2011] [Indexed: 12/22/2022] Open
Abstract
Background Enterotoxigenic Escherichia coli (ETEC) that express the F4ab and F4ac fimbriae is a major contributor to diarrhoea outbreaks in the pig breeding industry, infecting both newborn and weaned piglets. Some pigs are resistant to this infection, and susceptibility is inherited as a simple dominant Mendelian trait. Indentifying the genetics behind this trait will greatly benefit pig welfare as well as the pig breeding industry by providing an opportunity to select against genetically susceptible animals, thereby reducing the number of diarrhoea outbreaks. The trait has recently been mapped by haplotype sharing to a 2.5 Mb region on pig chromosome 13, a region containing 18 annotated genes. Findings The coding regions of five candidate genes for susceptibility to ETEC F4ab/ac infection (TFRC, ACK1, MUC20, MUC4 and KIAA0226), all located in the 2.5 Mb region, were investigated for the presence of possible causative mutations. A total of 34 polymorphisms were identified in either coding regions or their flanking introns. The genotyping data for two of those were found to perfectly match the genotypes at the ETEC F4ab/ac locus, a G to C polymorphism in intron 11 of TFRC and a C to T silent polymorphism in exon 22 of KIAA0226. Transcriptional profiles of the five genes were investigated in a porcine tissue panel including various intestinal tissues. All five genes were expressed in intestinal tissues at different levels but none of the genes were found differentially expressed between ETEC F4ab/ac resistant and ETEC F4ab/ac susceptible animals in any of the tested tissues. Conclusions None of the identified polymorphisms are obvious causative mutations for ETEC F4ab/ac susceptibility, as they have no impact on the level of the overall mRNA expression nor predicted to influence the composition of the amino acids composition. However, we cannot exclude that the five tested genes are bona fide candidate genes for susceptibility to ETEC F4ab/ac infection since the identified polymorphism might affect the translational apparatus, alternative splice forms may exist and post translational mechanisms might contribute to disease susceptibility.
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Affiliation(s)
- Mette Jacobsen
- Department of Basic Animal and Veterinary Sciences, University of Copenhagen, 1870 Frederiksberg, Denmark.
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Duc L, Neuenschwander S, Rehrauer H, Zeyer J. Application of a nifH microarray to assess the impact of environmental factors on free-living diazotrophs in a glacier forefield. Can J Microbiol 2011; 57:105-14. [PMID: 21326352 DOI: 10.1139/w10-100] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Glacier forefield environments are exposed to extreme and fluctuating climatic and nutritional conditions. The high diversity of free-living diazotrophic communities found in these environments indicates that nitrogen fixers are able to efficiently cope with such conditions. In this study, a nifH microarray was used to monitor changes in diazotrophic populations in the field over a season, in the presence or absence of plants and in 2 glacier forefields characterized by a different bedrock type (siliceous or calcareous), as well as at different temperatures (10 °C, 15 °C) and under different nitrogen fertilization regimes (0, 10, 40 kg N·ha(-1)·year(-1)) in laboratory systems. Population structures responded highly dynamically to environmental changes. Plant presence had the strongest impact, which decreased toward the end of the season and with high amounts of nitrogen fertilization. Temperature and nitrogen fertilization increases indirectly affected diazotrophic communities through their positive impact on plant growth. These results indicate strong carbon limitation in young glacier forefield soils. Phylotypes related to the genus Methylocystis strongly responded to environmental variations. These methanotrophic microorganisms, which are able to retrieve nitrogen and carbon from the atmospheric pool, are particularly adapted to the extreme nutritional conditions found in glacier forefields.
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Affiliation(s)
- Laurence Duc
- Environmental Microbiology, Swiss Federal Institute of Technology Zurich, Universitätstrasse 16, CH-8092 Zurich, Switzerland.
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23
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Pliška V, Hari J, Heiniger J, Neuenschwander S, Stranzinger G. Stress-like changes in the histological structure of pig adrenals and pituitaries: Effect of total body fat but not of predisposition to malignant hyperthermia. J Anim Breed Genet 2011. [DOI: 10.1111/j.1439-0388.1992.tb00378.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Minder EI, Schneider-Yin X, Mamet R, Horev L, Neuenschwander S, Baumer A, Austerlitz F, Puy H, Schoenfeld N. A homoallelic FECH mutation in a patient with both erythropoietic protoporphyria and palmar keratoderma. J Eur Acad Dermatol Venereol 2011; 24:1349-53. [PMID: 20337824 DOI: 10.1111/j.1468-3083.2010.03640.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Erythropoietic protoporphyria (EPP) is a hereditary disorder caused by the deficiency of ferrochelatase (FECH) in the haem biosynthetic pathway. In the majority of families, EPP is transmitted as a pseudodominant trait. Autosomal recessive form of EPP is found in only about 3% of the families. OBJECTIVES In this study, we describe a 6-year-old boy who suffered from both EPP and palmar keratoderma. METHODS AND RESULTS A novel homoallelic missense mutation (p.Ser318Tyr) was identified in the FECH gene. In addition, a region of homozygosity of approximately 6.8 Mb was observed in chromosome 18 of the patient by both microsatellite and SNP array. The parents of the patient, both of Palestinian (Jordanian) origin, were heterozygous for the S318Y mutation, although no history of consanguinity was known. Microsatellite genotyping identified a partial haplotype from each parent that corresponds to the region of homozygosity in the patient. Assuming S318Y is a founder mutation, the number of generations separating the two parents from their common ancestor from whom they inherited S318Y was estimated as 21.7 (95% CI 3.42–69.7). CONCLUSION EPP was therefore inherited as an autosomal recessive trait in the family. This study confirms the association between palmar keratoderma and autosomal recessive EPP.
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Affiliation(s)
- E I Minder
- Zentrallabor, Stadtspital Triemli, Zürich, Switzerland.
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Kariminejad A, Kariminejad R, Moshtagh A, Zanganeh M, Kariminejad MH, Neuenschwander S, Okoniewski M, Wey E, Schinzel A, Baumer A. Pericentric inversion of chromosome 18 in parents leading to a phenotypically normal child with segmental uniparental disomy 18. Eur J Hum Genet 2011; 19:555-60. [PMID: 21326286 DOI: 10.1038/ejhg.2010.252] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
In this study, we report a familial inversion of chromosome 18, inv(18)(p11.31q21.33), in both members of a consanguineous couple. Their first child had inherited one balanced pericentric inversion along with a recombinant chromosome 18 resulting in dup(18q)/del(18p), and had mild dysmorphic features in the absence of mental and developmental retardation. The second child had received two recombinant chromosomes 18, from the mother a derivative chromosome 18 with dup(18p)/del(18q) and from the father a derivative chromosome 18 with dup(18q)/del(18p). The aberration was prenatally detected; however, as the two opposite aneuploidies were thought to compensate each other, the family decided to carry on with the pregnancy, knowing that uniparental disomy for the segments outside the inversion could have an adverse influence on the development of the child. Uniparental disomy was confirmed by SNP arrays. The child, who has been followed up until the age of 20 months, is healthy and normal. It seems to be the first reported case with two opposite recombinant chromosomes that compensate each other and lead to segmental uniparental disomy for two segments on the chromosome, one maternal and the other paternal.
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Gerber S, Athanasiou A, Ala-Eddine C, Ollivier L, Neuenschwander S. 1. Post-radiation breast angiosarcoma: clinical and imaging findings to be known. Cancer Imaging 2011. [DOI: 10.1102/1470-7330.2011.9064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Gerber S, Ollivier L, Ala-Eddine C, Neuenschwander S. Brain metastasis: tips and tricks to pick it up. Cancer Imaging 2010. [DOI: 10.1102/1470-7330.2010.9063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Athanasiou A, Tardivon A, Gennisson J, Tanter M, Neuenschwander S. Ultrasound elastography in oncologic imaging. Cancer Imaging 2010. [DOI: 10.1102/1470-7330.2010.9085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Ollivier L, Apiou F, Leclère J, Sévellec M, Asselain B, Brédart A, Neuenschwander S. Patient experiences and preferences: development of practice guidelines in a cancer imaging department. Cancer Imaging 2009; 9 Spec No A:S92-7. [PMID: 19965300 PMCID: PMC2797468 DOI: 10.1102/1470-7330.2009.9040] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Objective: To improve patient management based on analysis of the results of a survey conducted during their visit to the imaging department of a cancer centre. Materials and methods: A questionnaire comprising 30 single-response questions on a dichotomous scale or a 3- or 4-modality scale was developed by three radiologists specialized in oncology, the head of our quality assurance department, a psycho-oncologist, a psycho-sociologist, a biostatistician and a member of our institute's Patient Committee. Questions concerned reception, information provided about the examinations, examination experiences, the relational qualities and availability of health care professionals, the interview with the radiologist and announcement of the examination results. Results: The questionnaire was given to 190 patients in the waiting room before a standard radiography or ultrasound examination (33%), mammography and breast ultrasound (33%), computed tomography (CT) or magnetic resonance imaging (MRI) (34%). The return rate was 81%. This article analyses the responses to the various questions in terms of either percentages or detailed replies and suggestions. Conclusion: Analysis of the patients’ experience and their suggestions provided objective elements concerning their real wishes in relation to each step of their management and identified changes and improvements to be made to the organization and daily functioning of the department.
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Affiliation(s)
- L Ollivier
- Department of Radiology, Institut Curie, 26 rue d'Ulm, 75248 Paris Cedex 05, France.
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Duc L, Neuenschwander S, Rehrauer H, Wagner U, Sobek J, Schlapbach R, Zeyer J. Development and experimental validation of anifHoligonucleotide microarray to study diazotrophic communities in a glacier forefield. Environ Microbiol 2009; 11:2179-89. [DOI: 10.1111/j.1462-2920.2009.01945.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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Brisse HJ, Brenot J, Pierrat N, Gaboriaud G, Savignoni A, De Rycke Y, Neuenschwander S, Aubert B, Rosenwald JC. The relevance of image quality indices for dose optimization in abdominal multi-detector row CT in children: experimental assessment with pediatric phantoms. Phys Med Biol 2009; 54:1871-92. [PMID: 19265204 DOI: 10.1088/0031-9155/54/7/002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This study assessed and compared various image quality indices in order to manage the dose of pediatric abdominal MDCT protocols and to provide guidance on dose reduction. PMMA phantoms representing average body diameters at birth, 1 year, 5 years, 10 years and 15 years of age were scanned in a four-channel MDCT with a standard pediatric abdominal CT protocol. Image noise (SD, standard deviation of CT number), noise derivative (ND, derivative of the function of noise with respect to dose) and contrast-to-noise ratio (CNR) were measured. The 'relative' low-contrast detectability (rLCD) was introduced as a new quantity to adjust LCD to the various phantom diameters on the basis of the LCD(1%) assessed in a Catphan phantom and a constant central absorbed dose. The required variations of CTDIvol(16) with respect to phantom size were analyzed in order to maintain each image quality index constant. The use of a fixed SD or CNR level leads to major dose ratios between extreme patient sizes (factor 22.7 to 44 for SD, 31.7 to 51.5 for CNR(2.8%)), whereas fixed ND and rLCD result in acceptable dose ratios ranging between factors of 2.9 and 3.9 between extreme phantom diameters. For a 5-9 mm rLCD1(%), adjusted ND values range between -0.84 and -0.11 HU mGy(-1). Our data provide guidance on dose reduction on the basis of patient dimensions and the required rLCD (e.g., to get a constant 7 mm rLCD(1%) for abdominal diameters of 10, 13, 16, 20 and 25 cm, tube current-time product should be adjusted in order to obtain CTDIvol(16) values of 6.2, 7.2, 8.8, 11.6 and 17.7 mGy, respectively).
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Affiliation(s)
- H J Brisse
- Imaging Department, Institut Curie, 26 rue d'Ulm 75005 Paris, France.
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32
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Ollivier L, Dolbeault S, Leclère J, Neuenschwander S. Améliorer la prise en charge des patients dans les services d’imagerie médicale en oncologie. PSYCHO-ONCOLOGIE 2008. [DOI: 10.1007/s11839-008-0066-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Neuenschwander S, Hospital F, Guillaume F, Goudet J. quantiNemo: an individual-based program to simulate quantitative traits with explicit genetic architecture in a dynamic metapopulation. Bioinformatics 2008; 24:1552-3. [DOI: 10.1093/bioinformatics/btn219] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Gerber S, Ollivier L, Leclère J, Vanel D, Missenard G, Brisse H, de Pinieux G, Neuenschwander S. Imaging of sacral tumours. Skeletal Radiol 2008; 37:277-89. [PMID: 18034341 DOI: 10.1007/s00256-007-0413-4] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Revised: 09/10/2007] [Accepted: 10/09/2007] [Indexed: 02/02/2023]
Abstract
All components of the sacrum (bone, cartilage, bone marrow, meninges, nerves, notochord remnants, etc.) can give rise to benign or malignant tumours. Bone metastases and intraosseous sites of haematological malignancies, lymphoma and multiple myeloma are the most frequent aetiologies, while primary bone tumours and meningeal or nerve tumours are less common. Some histological types have a predilection for the sacrum, especially chordoma and giant cell tumour. Clinical signs are usually minor, and sacral tumours are often discovered in the context of nerve root or pelvic organ compression. The roles of conventional radiology, CT and MRI are described and compared with the histological features of the main tumours. The impact of imaging on treatment decisions and follow-up is also reviewed.
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Affiliation(s)
- S Gerber
- Department of Radiology, Institut Curie, 26 rue d'Ulm, 75248 Paris, France.
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35
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Sigal-Zafrani B, Muller K, El Khoury C, Varoutas PC, Buron C, Vincent-Salomon A, Alran S, Livartowski A, Neuenschwander S, Salmon RJ. Vacuum-assisted large-core needle biopsy (VLNB) improves the management of patients with breast microcalcifications – Analysis of 1009 cases. Eur J Surg Oncol 2008; 34:377-81. [PMID: 17604937 DOI: 10.1016/j.ejso.2007.05.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2007] [Accepted: 05/16/2007] [Indexed: 10/23/2022] Open
Abstract
AIMS To evaluate the surgical management of patients who underwent VLNB for breast microcalcifications. METHODS This retrospective study compared the histological results and the surgical procedures in two groups of patients, group 1: large-core needle biopsy n=1009, and group 2: surgical biopsy n=270. RESULTS After VLNB, 54% patients were not operated on after stereotactic large-core needle biopsy, 42% underwent one operation, 4% underwent two operations and 0.2% underwent three operations. No surgery was performed for 95% of benign lesions. Multiples operations were necessary in 12% of patients with malignant lesions of VLNB group compared to 45% in the surgical biopsy group. The rate of underdiagnosis of borderline lesions and ductal carcinomas in situ was 16% by the large-core biopsy technique. CONCLUSION VLNB constitutes an alternative to surgical biopsy. This procedure avoids surgery for most benign lesions and reduces the number of surgical procedures in malignant lesions.
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Affiliation(s)
- B Sigal-Zafrani
- Institut Curie, Department of Tumour Biology, 26 rue d'Ulm, 75248 Paris Cedex 05, France.
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Vonlanthen P, Excoffier L, Bittner D, Persat H, Neuenschwander S, Largiadèr CR. Genetic analysis of potential postglacial watershed crossings in Central Europe by the bullhead (Cottus gobioL.). Mol Ecol 2007; 16:4572-84. [PMID: 17908217 DOI: 10.1111/j.1365-294x.2007.03531.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Natural colonizations across watersheds have been frequently proposed to explain the present distributions of many freshwater fish species. However, detailed studies of such potential watershed crossings are still missing. Here, we investigated potential postglacial watershed crossings of the widely distributed European bullhead (Cottus gobio L.) in two different areas along the Rhine-Rhône watershed using detailed genetic analysis. The main advantage of studying bullheads vs. other freshwater fish species is that their distribution has been lightly influenced by human activities and as such, interpretations of colonization history are not confounded by artificial transplantations. The genetic analyses of eight microsatellite loci revealed strong genetic similarities between populations of both sides of the Rhine-Rhône watershed in the Lake Geneva area, giving strong evidence for a natural watershed crossing of bullheads from the upper Rhine drainage into the Rhône drainage in the Lake Geneva area likely facilitated by the retreat of the glaciers after the last glacial maximum some 20,000 years ago. Populations from the Lake Geneva basin were genetically more similar to populations from across the watershed in the upper Rhine drainage than to populations further downstream in the lower Rhône. In contrast, populations from Belfort, an area, which was not covered by ice during the last glacial maximum, showed strong genetic differentiation between populations of the upper Rhine and Rhône drainages. Based on our results on the bullhead, we propose that glacial retreat may have eased the dispersal of numerous European freshwater fish species across several geological boundaries.
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Affiliation(s)
- P Vonlanthen
- Computational and Molecular Population Genetics lab (CMPG), Zoologisches Institut, Universität Bern, Baltzerstrasse 6, CH-3012 Bern, Switzerland
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Abstract
Positron emission tomography (PET)/computed tomography (CT) imaging is frequently requested in Oncology. Radiologists and nuclear medicine physicians are often asked to perform a panel of imaging examinations as part of the initial staging or follow-up of cancer patients. Medical imaging must therefore integrate polyvalent skills enabling imaging specialists to understand and interpret all types of images. In this context, PET imaging combined with non-enhanced CT, and diagnostic quality contrast-enhanced CT scan and optimisation of CT settings, is part of this multidisciplinary approach requiring the specific skills of a radiologist and a nuclear medicine physician. This approach must therefore be conducted in both directions: radiologists and nuclear medicine physicians should both know how to correlate PET and CT images, while preserving the specificities of each discipline. Radiologists need to be aware of several aspects of PET imaging: PET technology, the examination procedure and injection of iodinated contrast agent for high quality diagnostic CT, ideally followed by double interpretation of CT images, PET images and fused images. Radiologists should be familiar with PET imaging, as this procedure may be associated with several pitfalls and artefacts that need interpretation by a trained specialist. The authors analyse the examination technique of PET combined with non-enhanced and/or contrast-enhanced CT and the proposals for optimal interpretation of normal or pathological PET/CT fusion images.
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Affiliation(s)
- M Benamor
- Institut Curie, Departement d'imagerie, 75005 Paris, France.
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Genini S, Kratzsch A, Korczak B, Neuenschwander S, Brenig B, Jörg H, Bürgi E, Ossent P, Stranzinger G, Vögeli P. Analysis and mapping of CACNB4, CHRNA1, KCNJ3, SCN2A and SPG4, physiological candidate genes for porcine congenital progressive ataxia and spastic paresis. J Anim Breed Genet 2007; 124:269-76. [PMID: 17868079 DOI: 10.1111/j.1439-0388.2007.00673.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The cause of porcine congenital progressive ataxia and spastic paresis (CPA) is unknown. This severe neuropathy manifests shortly after birth and is lethal. The disease is inherited as a single autosomal recessive allele, designated cpa. In a previous study, we demonstrated close linkage of cpa to microsatellite SW902 on porcine chromosome 3 (SSC3), which corresponds syntenically to human chromosome 2. This latter chromosome contains ion channel genes (Ca(2+), K(+) and Na(+)), a cholinergic receptor gene and the spastin (SPG4) gene, which cause human epilepsy and ataxia when mutated. We mapped porcine CACNB4, KCNJ3, SCN2A and CHRNA1 to SSC15 and SPG4 to SSC3 with the INRA-Minnesota porcine radiation hybrid panel (IMpRH) and we sequenced the entire open reading frames of CACNB4 and SPG4 without finding any differences between healthy and affected piglets. An anti-epileptic drug treatment with ethosuximide did not change the severity of the disease, and pigs with CPA did not exhibit the corticospinal tract axonal degeneration found in humans suffering from hereditary spastic paraplegia, which is associated with mutations in SPG4. For all these reasons, the hypothesis that CACNB4, CHRNA1, KCNJ3, SCN2A or SPG4 are identical with the CPA gene was rejected.
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Affiliation(s)
- S Genini
- Parco Tecnologico Padano, CERSA, Via Einstein, Lodi, Italy
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Abstract
OBJECTIVE To evaluate elastography in the characterization of breast nodules. MATERIAL AND METHODS Elastography (Hitachi, 7.5- to 13-MHz probe; Ueno classification, scores 1-3=benign, 4-5=malignant) was evaluated in 125 subclinical lesions in 114 patients. The results were compared to those of the ACR's BI-RADS sonography categories (benign=2 and 3, malignant=4 and 5) and to the results of the percutaneous samples taken and/or surgery (122 lesions evaluated, 59%<10 mm, 61 cancers, 61 benign lesions). RESULTS There were three technical failures (2.4%). The elastography was in agreement with histology for 101 lesions, with 13 false-negative results and eight false-positive results (sensitivity, 78.7%; specificity, 86.9%; PPV, 85.7%; NPV, 80.3%); versus agreement with the BI-RADS classification for 98 lesions with one false-negative result and 23 false-positive results (sensitivity, 98.4%; specificity, 47.5%; PPV, 65.2%; NPV, 96.7%). CONCLUSION Elastography is a simple and rapid complementary method that can improve the specificity and the PPV of morphological imaging studies of breast nodules with a low level of suspicion (BI-RADS categories 3 and 4a), which should decrease the rate of unnecessary benign biopsies.
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Affiliation(s)
- A Tardivon
- Service de Radiologie, Institut Curie, 26 rue d'Ulm, 75248 Paris cedex 05.
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Affiliation(s)
- C El Khoury
- Institut Curie, département d'Imagerie, 26 rue d'Ulm, Paris.
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Leclère J, Ollivier L, Ruszniewski M, Neuenschwander S. [Improving overall patient care during imaging studies: the radiologist's CREDO and PERLES]. ACTA ACUST UNITED AC 2007; 87:1831-6. [PMID: 17213767 DOI: 10.1016/s0221-0363(06)74163-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The protocols specifying the basic rules of the doctor-patient relationship that have been proposed in the literature are primarily intended for referring physicians, in particular oncologists. With regard to the improving radiologists' communication skills, a simple tool, RADPED, was developed to help residents in pediatric radiology to memorize the main points of the patient-radiologist interaction. We suggest a protocol, CREDO, more precisely appropriated to the everyday practice of medical imaging, in particular in oncology. This protocol relates not only to the radiologist-patient relationship, but also to the rules common to the department's entire team. The aims are to establish a partnership with the patient (for this purpose, we suggest using the PERLES model: partnership, excuses (apology), respect, legitimization, empathy, support), carrying out the examination under optimal conditions, listening to what the patient has to say, giving information and, above all, organizing the imaging department around the patient.
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Affiliation(s)
- J Leclère
- Département d'Imagerie, Service d'Echographie, Institut Gustave Roussy, Villejuif
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Levy Gabriel C, Khlif H, Lumbroso Le Rouic L, Morax S, Dendale R, Neuenschwander S, Desjardins L. 612 Mélanome palpébral desmoplastique neurotrope : à propos d’une observation. J Fr Ophtalmol 2007. [DOI: 10.1016/s0181-5512(07)80425-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Abstract
OBJECTIVE Evaluate the usefulness of MRI in local staging of Paget disease of the breast. MATERIALS AND METHODS Clinical, radiological (mammographies, MRI), and histological data were analyzed in six female patients presenting Paget disease of the breast. The criteria for analysis in MRI were the following: morphology of the aureola-nipple plaque (thickening, regularity of the contour) and the type of enhancement after injection of contrast medium (signal intensity/time curve), detection of abnormal enhancing in the mammary gland, and ganglion areas. RESULTS None of the patients presented a palpable mass or a suspicious anomaly on mammography. On MRI, the aureola-nipple plaque was morphologically abnormal in four cases, with suspicious enhancement in two cases (two cases of ductal carcinoma in situ) and normal enhancement in two cases (one case of ductal carcinoma in situ). In the two other cases, the aureola-nipple plaque was normal (one case of ductal carcinoma in situ). Distant abnormal enhancement of the aureola-nipple plaque was noted in two cases (one case of ductal carcinoma in situ and one benign lesion). CONCLUSION The MRI aspect of the aureola-nipple plaque in Paget disease shows little concordance with the histological results. MRI can be useful in detecting distant lesions when there is no clinical sign nor a suspicious mammography.
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Affiliation(s)
- N Haddad
- Service de Radiologie, Institut Curie, 26 rue d'Ulm, 75248 Paris Cedex 05, France.
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Schmidt D, Mol A, Odermatt B, Neuenschwander S, Breymann C, Gössi M, Genoni M, Zund G, Hoerstrup SP. Engineering of Biologically Active Living Heart Valve Leaflets Using Human Umbilical Cord–Derived Progenitor Cells. ACTA ACUST UNITED AC 2006; 12:3223-32. [PMID: 17518636 DOI: 10.1089/ten.2006.12.3223] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study demonstrates the engineering of biologically active heart valve leaflets using prenatally available human umbilical cord-derived progenitor cells as the only cell source. Wharton's Jelly-derived cells and umbilical cord blood-derived endothelial progenitor cells were subsequently seeded on biodegradable scaffolds and cultured in a biomimetic system under biochemical or mechanical stimulation or both. Depending on the stimulation, leaflets showed mature layered tissue formation with functional endothelia and extracellular matrix production comparable with that of native tissues. This demonstrates the feasibility of heart valve leaflet fabrication from prenatal umbilical cord-derived progenitor cells as a further step in overcoming the lack of living autologous replacements with growth and regeneration potential for the repair of congenital malformation.
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Affiliation(s)
- Dörthe Schmidt
- Department of Surgical Research and Clinic for Cardiovascular Surgery, University Hospital and University of Zurich, Zurich, Switzerland
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Guesmi M, Sastre X, Desjardins L, Lumbroso L, Aerts I, Doz F, Asselain B, Bours D, Neuenschwander S, Brisse H. Depistage pre-operatoire de l’extension au nerf optique des retinoblastomes : correlation imagerie-pathologie. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/s0221-0363(06)87307-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Schmidt D, Mol A, Breymann C, Achermann J, Odermatt B, Gössi M, Neuenschwander S, Prêtre R, Genoni M, Zund G, Hoerstrup SP. Living autologous heart valves engineered from human prenatally harvested progenitors. Circulation 2006; 114:I125-31. [PMID: 16820561 DOI: 10.1161/circulationaha.105.001040] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Heart valve tissue engineering is a promising strategy to overcome the lack of autologous growing replacements, particularly for the repair of congenital malformations. Here, we present a novel concept using human prenatal progenitor cells as new and exclusive cell source to generate autologous implants ready for use at birth. METHODS AND RESULTS Human fetal mesenchymal progenitors were isolated from routinely sampled prenatal chorionic villus specimens and expanded in vitro. A portion was cryopreserved. After phenotyping and genotyping, cells were seeded onto synthetic biodegradable leaflet scaffolds (n=12) and conditioned in a bioreactor. After 21 days, leaflets were endothelialized with umbilical cord blood-derived endothelial progenitor cells and conditioned for additional 7 days. Resulting tissues were analyzed by histology, immunohistochemistry, biochemistry (amounts of extracellular matrix, DNA), mechanical testing, and scanning electron microscopy (SEM) and were compared with native neonatal heart valve leaflets. Fresh and cryopreserved cells showed comparable myofibroblast-like phenotypes. Genotyping confirmed their fetal origin. Neo-tissues exhibited organization, cell phenotypes, extracellular matrix production, and DNA content comparable to their native counterparts. Leaflet surfaces were covered with functional endothelia. SEM showed cellular distribution throughout the polymer and smooth surfaces. Mechanical profiles approximated those of native heart valves. CONCLUSIONS Prenatal fetal progenitors obtained from routine chorionic villus sampling were successfully used as an exclusive, new cell source for the engineering of living heart valve leaflets. This concept may enable autologous replacements with growth potential ready for use at birth. Combined with the use of cell banking technology, this approach may be applied also for postnatal applications.
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Affiliation(s)
- Dörthe Schmidt
- Clinic for Cardiovascular Surgery and Department of Surgical Research, University and University Hospital Zurich, Raemistrasse 100, CH 8091 Zurich, Switzerland
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Hoerstrup SP, Cummings Mrcs I, Lachat M, Schoen FJ, Jenni R, Leschka S, Neuenschwander S, Schmidt D, Mol A, Günter C, Gössi M, Genoni M, Zund G. Functional Growth in Tissue-Engineered Living, Vascular Grafts. Circulation 2006; 114:I159-66. [PMID: 16820566 DOI: 10.1161/circulationaha.105.001172] [Citation(s) in RCA: 131] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background—
Living autologous vascular grafts with the capacity for regeneration and growth may overcome the limitations of contemporary artificial prostheses. Particularly in congenital cardiovascular surgery, there is an unmet medical need for growing replacement materials. Here we investigate growth capacity of tissue-engineered living pulmonary arteries in a growing lamb model.
Methods and Results—
Vascular grafts fabricated from biodegradable scaffolds (ID 18±l mm) were sequentially seeded with vascular cells. The seeded constructs were grown in vitro for 21days using biomimetic conditions. Thereafter, these tissue-engineered vascular grafts (TEVGs) were surgically implanted as main pulmonary artery replacements in 14 lambs using cardiopulmonary bypass and followed up for ≤100 weeks. The animals more than doubled their body weight during the 2-year period. The TEVG showed good functional performance demonstrated by regular echocardiography at 20, 50, 80, and 100 weeks and computed tomography-angiography. In particular, there was no evidence of thrombus, calcification, stenosis, suture dehiscence, or aneurysm. There was a significant increase in diameter by 30% and length by 45%. Histology showed tissue formation reminiscent of native artery. Biochemical analysis revealed cellularity and proteoglycans and increased collagen contents in all of the groups, analogous to those of native vessels. The mechanical profiles of the TEVG showed stronger but less elastic tissue properties than native pulmonary arteries.
Conclusions—
This study provides evidence of growth in living, functional pulmonary arteries engineered from vascular cells in a full growth animal model.
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Affiliation(s)
- Simon P Hoerstrup
- Clinic for Cardiovascular Surgery and Department of Surgical Research, University and University Hospital Zurich, Raemistrasse 100, CH 8091 Zurich, Switzerland.
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Abstract
Along with advances in medicine and social evolution, we are seeing an increase in the number of patients afflicted with cancer, and a change in the doctor-patient relationship. Patients' rights are now registered in the Hospitalised Patient's Charter, the Huriet Act and the Act of March 4, 2002. The evolution in cancer diseases is monitored by a range of imaging examinations, putting the radiologist in the front line. Lesions are typically first detected by the radiologist. This task is complicated by the fact that radiologists usually have no formal training with regards to the disclosure of cancer diagnoses to patients. There is a great risk of inappropriate responses which can have a profoundly damaging effect on the patient's state of mind. Even if we have the best of ideals and intentions, there is a great need for us to examine and improve our modes of interaction, in dealing with the patient's need for information. The radiologist possesses technical know-how, but technique alone is not enough - the right amount of information, based on clinical competence, is required; but so is empathy towards the patient, and respect for his or her wishes and rights.
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Affiliation(s)
- J Leclère
- Département d'Imagerie, Service d'Echographie, Institut Gustave Roussy, Villejuif
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Affiliation(s)
- L Ollivier
- Département d'imagerie, institut Curie, 26, rue d'Ulm, 75005 Paris, France.
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Omi T, Brenig B, Spilar Kramer S, Iwamoto S, Stranzinger G, Neuenschwander S. Identification and characterization of novel peroxisome proliferator-activated receptor-gamma (PPAR-gamma) transcriptional variants in pig and human. J Anim Breed Genet 2005; 122 Suppl 1:45-53. [PMID: 16130456 DOI: 10.1111/j.1439-0388.2005.00508.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The peroxisome proliferator-activated receptor-gamma (PPAR-gamma) is a member of the steroid/thyroid/retinoid receptor superfamily, and is primarily expressed in fat tissue. To date, two major PPAR-gamma isoforms have been identified in pig, PPAR-gamma1 and PPAR-gamma2. Porcine PPAR-gamma1a consists of two leader exons, designated A1 and A2, followed by six exons containing the open reading frame. Here, we report the isolation and characterization of three novel PPAR-gamma1 transcripts. PPAR-gamma1b is derived from exon A1, with exon A2 spliced out. PPAR-gamma1c and PPAR-gamma1d are derived from the new exon, A', containing exon A2 (gamma1c) or without exon A2 (gamma1d). Based on PCR analysis of PAC clones that included sequences from the 5'-untranslated region of the PPAR-gamma gene, the new A' exon is located between the known exons A1 and A2. We also isolated the human homologue to exon A', as well as the two new PPAR-gamma1c and -gamma1d splice variants, from human adipose tissue. Studies of the expression of porcine PPAR-gamma by real time reverse transcription-polymerase chain reaction analysis show that transcripts derived from exon A1 were not expressed at significantly different levels in visceral fat (lamina subserosa) or subcutaneous fat (back fat, inner and outer layer). In contrast, exon A'-derived transcripts were expressed at progressively higher levels in the inner and outer layers of subcutaneous fat than in visceral fat. The same expression pattern was also observed for PPAR-gamma2. We hypothesize that there are three promoters, which differentially regulate PPAR-gamma1 and PPAR-gamma2 gene expression, depending on the specific localization of the fat tissue.
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Affiliation(s)
- T Omi
- Swiss Federal Institute of Technology, Institute of Animal Sciences, Zurich, Switzerland
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