| 1. |
- Sungnak, W., et al.
(författare)
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SARS-CoV-2 entry factors are highly expressed in nasal epithelial cells together with innate immune genes
- 2020
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Ingår i: Nature Medicine. - : Nature Research. - 1078-8956 .- 1546-170X. ; 26:5, s. 681-687
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Tidskriftsartikel (refereegranskat)abstract
- We investigated SARS-CoV-2 potential tropism by surveying expression of viral entry-associated genes in single-cell RNA-sequencing data from multiple tissues from healthy human donors. We co-detected these transcripts in specific respiratory, corneal and intestinal epithelial cells, potentially explaining the high efficiency of SARS-CoV-2 transmission. These genes are co-expressed in nasal epithelial cells with genes involved in innate immunity, highlighting the cells’ potential role in initial viral infection, spread and clearance. The study offers a useful resource for further lines of inquiry with valuable clinical samples from COVID-19 patients and we provide our data in a comprehensive, open and user-friendly fashion at www.covid19cellatlas.org.
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| 2. |
- Sikkema, Lisa, et al.
(författare)
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An integrated cell atlas of the lung in health and disease
- 2023
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Ingår i: Nature Medicine. - : Springer Nature. - 1078-8956 .- 1546-170X. ; 29:6, s. 1563-1577
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Tidskriftsartikel (refereegranskat)abstract
- Single-cell technologies have transformed our understanding of human tissues. Yet, studies typically capture only a limited number of donors and disagree on cell type definitions. Integrating many single-cell datasets can address these limitations of individual studies and capture the variability present in the population. Here we present the integrated Human Lung Cell Atlas (HLCA), combining 49 datasets of the human respiratory system into a single atlas spanning over 2.4 million cells from 486 individuals. The HLCA presents a consensus cell type re-annotation with matching marker genes, including annotations of rare and previously undescribed cell types. Leveraging the number and diversity of individuals in the HLCA, we identify gene modules that are associated with demographic covariates such as age, sex and body mass index, as well as gene modules changing expression along the proximal-to-distal axis of the bronchial tree. Mapping new data to the HLCA enables rapid data annotation and interpretation. Using the HLCA as a reference for the study of disease, we identify shared cell states across multiple lung diseases, including SPP1 + profibrotic monocyte-derived macrophages in COVID-19, pulmonary fibrosis and lung carcinoma. Overall, the HLCA serves as an example for the development and use of large-scale, cross-dataset organ atlases within the Human Cell Atlas.
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| 3. |
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| 4. |
- Hilson, P., et al.
(författare)
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Versatile gene-specific sequence tags for Arabidopsis functional genomics : Trancript profiling and reverse genetics applications
- 2004
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Ingår i: Genome Research. - : Cold Spring Harbor Laboratory. - 1088-9051 .- 1549-5469. ; 14:10B, s. 2176-2189
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Tidskriftsartikel (refereegranskat)abstract
- Microarray transcript profiling and RNA interference are two new technologies crucial for large-scale gene function studies in multicellular eukaryotes. Both rely on sequence-specific hybridization between complementary nucleic acid strands, inciting us to create a collection of gene-specific sequence tags (GSTs) representing at least 21,500 Arabidopsis genes and which are compatible with both approaches. The GSTs were carefully selected to ensure that each of them shared no significant similarity with any other region in the Arabidopsis genome. They were synthesized by PCR amplification from genomic DNA. Spotted microarrays fabricated from the GSTs show good dynamic range, specificity, and sensitivity in transcript profiling experiments. The GSTs have also been transferred to bacterial plasmid vectors via recombinational cloning protocols. These cloned GSTs constitute the ideal starting point for a variety of functional approaches, including reverse genetics. We have subcloned GSTs on a large scale into vectors designed for gene silencing in plant cells. We show that in planta expression of GST hairpin RNA results in the expected phenotypes in silenced Arabidopsis lines. These versatile GST resources provide novel and powerful tools for functional genomics.
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| 5. |
- Regev, A, et al.
(författare)
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The Human Cell Atlas
- 2017
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Ingår i: eLife. - : ELIFE SCIENCES PUBLICATIONS LTD. - 2050-084X. ; 6
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Tidskriftsartikel (refereegranskat)
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| 6. |
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| 7. |
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| 9. |
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| 10. |
- Vickman, R. E., et al.
(författare)
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Deconstructing tumor heterogeneity : The stromal perspective
- 2020
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Ingår i: Oncotarget. - : Impact Journals LLC. - 1949-2553. ; 11:40, s. 3621-3632
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Tidskriftsartikel (refereegranskat)abstract
- Significant advances have been made towards understanding the role of immune cell-tumor interplay in either suppressing or promoting tumor growth, progression, and recurrence, however, the roles of additional stromal elements, cell types and/or cell states remain ill-defined. The overarching goal of this NCI-sponsored workshop was to highlight and integrate the critical functions of non-immune stromal components in regulating tumor heterogeneity and its impact on tumor initiation, progression, and resistance to therapy. The workshop explored the opposing roles of tumor supportive versus suppressive stroma and how cellular composition and function may be altered during disease progression. It also highlighted microenvironment-centered mechanisms dictating indolence or aggressiveness of early lesions and how spatial geography impacts stromal attributes and function. The prognostic and therapeutic implications as well as potential vulnerabilities within the heterogeneous tumor microenvironment were also discussed. These broad topics were included in this workshop as an effort to identify current challenges and knowledge gaps in the field. Copyright:
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| 11. |
- Zhu, Y., et al.
(författare)
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Proteogenomics produces comprehensive and highly accurate protein-coding gene annotation in a complete genome assembly of Malassezia sympodialis
- 2017
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Ingår i: Nucleic Acids Research. - : Oxford University Press. - 0305-1048 .- 1362-4962. ; 45:5, s. 2629-2643
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Tidskriftsartikel (refereegranskat)abstract
- Complete and accurate genome assembly and annotation is a crucial foundation for comparative and functional genomics. Despite this, few complete eukaryotic genomes are available, and genome annotation remains a major challenge. Here, we present a complete genome assembly of the skin commensal yeast Malassezia sympodialis and demonstrate how proteogenomics can substantially improve gene annotation. Through long-read DNA sequencing, we obtained a gap-free genome assembly for M. sympodialis (ATCC 42132), comprising eight nuclear and one mitochondrial chromosome. We also sequenced and assembled four M. sympodialis clinical isolates, and showed their value for understanding Malassezia reproduction by confirming four alternative allele combinations at the two mating-type loci. Importantly, we demonstrated how proteomics data could be readily integrated with transcriptomics data in standard annotation tools. This increased the number of annotated protein-coding genes by 14% (from 3612 to 4113), compared to using transcriptomics evidence alone. Manual curation further increased the number of protein-coding genes by 9% (to 4493). All of these genes have RNA-seq evidence and 87% were confirmed by proteomics. The M. sympodialis genome assembly and annotation presented here is at a quality yet achieved only for a few eukaryotic organisms, and constitutes an important reference for future host-microbe interaction studies.
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| 12. |
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| 19. |
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| 20. |
- Figiel, Sandy, et al.
(författare)
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Spatial transcriptomic analysis of virtual prostate biopsy reveals confounding effect of tissue heterogeneity on genomic signatures
- 2023
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Ingår i: Molecular Cancer. - : Springer Nature. - 1476-4598. ; 22:1, s. 162-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Genetic signatures have added a molecular dimension to prognostics and therapeutic decision-making. However, tumour heterogeneity in prostate cancer and current sampling methods could confound accurate assessment. Based on previously published spatial transcriptomic data from multifocal prostate cancer, we created virtual biopsy models that mimic conventional biopsy placement and core size. We then analysed the gene expression of different prognostic signatures (OncotypeDx®, Decipher®, Prostadiag®) using a step-wise approach with increasing resolution from pseudo-bulk analysis of the whole biopsy, to differentiation by tissue subtype (benign, stroma, tumour), followed by distinct tumour grade and finally clonal resolution. The gene expression profile of virtual tumour biopsies revealed clear differences between grade groups and tumour clones, compared to a benign control, which were not reflected in bulk analyses. This suggests that bulk analyses of whole biopsies or tumour-only areas, as used in clinical practice, may provide an inaccurate assessment of gene profiles. The type of tissue, the grade of the tumour and the clonal composition all influence the gene expression in a biopsy. Clinical decision making based on biopsy genomics should be made with caution while we await more precise targeting and cost-effective spatial analyses.
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| 21. |
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| 22. |
- Gioti, Anastasia, et al.
(författare)
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Genomic Insights into the Atopic Eczema-Associated Skin Commensal Yeast Malassezia sympodialis
- 2013
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Ingår i: mBio. - 2161-2129 .- 2150-7511. ; 4:1, s. e00572-12-
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Tidskriftsartikel (refereegranskat)abstract
- Malassezia commensal yeasts are associated with a number of skin disorders, such as atopic eczema/dermatitis and dandruff, and they also can cause systemic infections. Here we describe the 7.67-Mbp genome of Malassezia sympodialis, a species associated with atopic eczema, and contrast its genome repertoire with that of Malassezia globosa, associated with dandruff, as well as those of other closely related fungi. Ninety percent of the predicted M. sympodialis protein coding genes were experimentally verified by mass spectrometry at the protein level. We identified a relatively limited number of genes related to lipid biosynthesis, and both species lack the fatty acid synthase gene, in line with the known requirement of these yeasts to assimilate lipids from the host. Malassezia species do not appear to have many cell wall-localized glycosylphosphatidylinositol (GPI) proteins and lack other cell wall proteins previously identified in other fungi. This is surprising given that in other fungi these proteins have been shown to mediate interactions (e. g., adhesion and biofilm formation) with the host. The genome revealed a complex evolutionary history for an allergen of unknown function, Mala s 7, shown to be encoded by a member of an amplified gene family of secreted proteins. Based on genetic and biochemical studies with the basidiomycete human fungal pathogen Cryptococcus neoformans, we characterized the allergen Mala s 6 as the cytoplasmic cyclophilin A. We further present evidence that M. sympodialis may have the capacity to undergo sexual reproduction and present a model for a pseudobipolar mating system that allows limited recombination between two linked MAT loci. IMPORTANCE Malassezia commensal yeasts are associated with a number of skin disorders. The previously published genome of M. globosa provided some of the first insights into Malassezia biology and its involvement in dandruff. Here, we present the genome of M. sympodialis, frequently isolated from patients with atopic eczema and healthy individuals. We combined comparative genomics with sequencing and functional characterization of specific genes in a population of clinical isolates and in closely related model systems. Our analyses provide insights into the evolution of allergens related to atopic eczema and the evolutionary trajectory of the machinery for sexual reproduction and meiosis. We hypothesize that M. sympodialis may undergo sexual reproduction, which has important implications for the understanding of the life cycle and virulence potential of this medically important yeast. Our findings provide a foundation for the development of genetic and genomic tools to elucidate host-microbe interactions that occur on the skin and to identify potential therapeutic targets.
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| 23. |
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| 24. |
- Haniffa, Muzlifah, et al.
(författare)
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A roadmap for the Human Developmental Cell Atlas
- 2021
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 597:7875, s. 196-205
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Tidskriftsartikel (refereegranskat)abstract
- This Perspective outlines the Human Developmental Cell Atlas initiative, which uses state-of-the-art technologies to map and model human development across gestation, and discusses the early milestones that have been achieved. The Human Developmental Cell Atlas (HDCA) initiative, which is part of the Human Cell Atlas, aims to create a comprehensive reference map of cells during development. This will be critical to understanding normal organogenesis, the effect of mutations, environmental factors and infectious agents on human development, congenital and childhood disorders, and the cellular basis of ageing, cancer and regenerative medicine. Here we outline the HDCA initiative and the challenges of mapping and modelling human development using state-of-the-art technologies to create a reference atlas across gestation. Similar to the Human Genome Project, the HDCA will integrate the output from a growing community of scientists who are mapping human development into a unified atlas. We describe the early milestones that have been achieved and the use of human stem-cell-derived cultures, organoids and animal models to inform the HDCA, especially for prenatal tissues that are hard to acquire. Finally, we provide a roadmap towards a complete atlas of human development.
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| 25. |
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| 26. |
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| 27. |
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| 28. |
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| 29. |
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| 30. |
- Odeberg, J, et al.
(författare)
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Context-dependent Taq-polymerase-mediated nucleotide alterations, as revealed by direct sequencing of the ZNF189 gene : implications for mutation detection.
- 1999
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Ingår i: Gene. - 0378-1119 .- 1879-0038. ; 235:1-2
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Tidskriftsartikel (refereegranskat)abstract
- We have recently reported on the genetic organisation of a novel Krüppel-like zinc finger, ZNF189, located to 9q22-q31. In that study we found no mutations in the coding sequence when using ZNF189 as a candidate gene for sporadic basal cell cancer and squamous cell cancer. Here, by direct sequencing of the proximal promotor of ZNF189, mutations were found to appear in a small hot-spot region in over 50% of analysed tumour samples, the majority being G to A substitutions. The hot-spot region spans a 24bp G-rich region. Repeated analyses of the original sample lysates fail to confirm each of these mutations; and frequently new mutations appear at neighbouring positions. Subsequent analysis with serial dilutions of genomic DNA and a cosmid harbouring the wild-type ZNF189 gene demonstrate that these sequence-specific alterations arise in the outer PCR-amplification when 50 copies or less of template are used. Although the mechanism of how these context-specific alterations arise is not proven, the results demonstrate a previously unreported type of PCR-mediated sequence-specific alteration that easily could have been interpreted as being of clinical relevance. The phenomena observed show that mutations detected by direct sequencing can be caused by PCR-introduced alterations. Consequently, this should be of general caution in mutation analysis of disease gene candidates when using small amounts of template, such as microdissected biopsies.
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| 31. |
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| 32. |
- ODEBERG, J, et al.
(författare)
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Dynamic analysis of heterogeneous hepatitis C virus populations by direct solid-phase sequencing
- 1995
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Ingår i: Journal of clinical microbiology. - : American Society for Microbiology. - 0095-1137 .- 1098-660X. ; 33:7, s. 1870-1874
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Tidskriftsartikel (refereegranskat)abstract
- In the present study, we used a semiautomated solid-phase direct sequencing method to analyze sequence diversity and variation of the hypervariable E2/NS1 region in the hepatitis C virus (HCV) genome in isolates from patients seropositive for HCV. A total of 24 isolates of various origins were sequenced. Six of the patients, not subject to any antiviral therapy, were monitored longitudinally, and rapid sequence variations were observed over a period of 14 months. The nucleotide change rate was found to be 0.1 to 0.2 nucleotide substitution per genome site per year. Furthermore, isolates from five of the patients were used for a comparative study of the direct solid-phase sequencing approach versus the frequently used approach of sequencing individual reverse transcriptase PCR clones. The advantage of direct solid-phase sequencing for studying dynamic changes in heterogeneous populations of HCV is discussed.
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| 33. |
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| 34. |
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| 35. |
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| 36. |
- Pontén, F, et al.
(författare)
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Genomic analysis of single cells from human basal cell cancer using laser-assisted capture microscopy.
- 1997
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Ingår i: Mutation research. - 0027-5107 .- 1873-135X. ; 382:1-2
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Tidskriftsartikel (refereegranskat)abstract
- In this study, we show that direct mutational analysis of genomic DNA can be performed on single somatic cells extracted from a frozen, immunohistochemically stained tissue section using laser-assisted capture microscopy. Eighty-nine single tumor cells were separately dissected from one case of human basal cell cancer (BCC) and p53 mutations were analyzed by direct semi-automated sequencing of PCR fragments. Amplification was obtained for at least one of the two analyzed exons from approximately 50% of the single tumor cells. Identical p53 mutations were found in widely spread areas of the tumor, suggesting a clonal proliferation originating from one cell. Interestingly, comparison between results of immunohistochemistry and genetic analysis of the single cells revealed the same p53 mutations irrespective of the p53 immunoreactivity. We propose that this approach has a great potential to allow investigation of genotypic differences in single cells and more specifically to resolve important and fundamental questions determining cancer heterogeneity.
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| 37. |
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| 38. |
- Pontén, F, et al.
(författare)
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Molecular pathology in basal cell cancer with p53 as a genetic marker.
- 1997
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Ingår i: Oncogene. - : Springer Science and Business Media LLC. - 0950-9232 .- 1476-5594. ; 15:9
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Tidskriftsartikel (refereegranskat)abstract
- Human basal cell cancer (BCC) has unique growth characteristics with virtual inability to metastasize. We investigated clonality and genetic progression using p53 mutations as marker. Sampling was done through microdissection of frozen immunohistochemically stained 16 microm slices of tumors. From 11 BCC tumors 78 samples were analysed. Direct DNA sequencing of exons 5-8 was performed, haplotypes were determined after cloning of p53 exons and loss of heterozygosity (LOH) ascertained by microsatellite analysis. All tumors had p53 mutations and in a majority both p53 alleles were affected, commonly through missense mutations. Microdissection of small parts (50-100 cells) of individual tumors showed BCC to be composed of a dominant cell clone and prone to genetic progression with appearance of subclones with a second and even third p53 mutation. Samples from normal immunohistochemically negative epidermis always showed wild type sequence, except for a case of previously unknown germline p53 mutation. Our analysis also included p53 immunoreactive patches i.e. morphologically normal epidermis with a compact pattern of p53 immunoreactivity. Mutations within those were never the same as in the adjacent BCC. This detailed study of only one gene thus uncovered a remarkable heterogeneity within a tumor category famous for its benign clinical behavior.
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| 39. |
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| 40. |
- Ren, Z. P., et al.
(författare)
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Benign clonal keratinocyte patches with p53 mutations show no genetic link to synchronous squamous cell precancer or cancer in human skin
- 1997
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Ingår i: American Journal of Pathology. - : American Society for Investigative Pathology and the Association for Molecular Pathology. - 0002-9440 .- 1525-2191. ; 150:5, s. 1791-803
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Tidskriftsartikel (refereegranskat)abstract
- Ultraviolet light, which is the major etiology of human skin cancer, will cause mutations in the p53 gene. We and others have found that such mutations occur in more than one-half of non-melanoma squamous cell cancer and precancer. Immunostaining for p53 has disclosed a characteristic compact pattern not only in cancer/precancer but also in areas of microscopically normal epidermis termed p53 patches. By microdissection, sequence analysis of the p53 gene, and analysis of loss of heterozygosity (LOH) at the site of this gene, we have now extended previous data to ascertain whether these p53 patches are precursors of simultaneously present squamous cell cancer or its morphologically recognized precancerous stages (dysplasia, carcinoma in situ). In none of 11 instances with co-existence of a p53 patch with dysplasia or in situ or invasive cancer were the mutations identical. We conclude that p53 patches, estimated to be approximately 100,000 times as common as dysplasia, have a very small or even no precancerous potential. Their common presence demonstrates that human epidermis contains a large number of p53 mutations apparently without detrimental effect. The only result of the mutation may be a clandestine benign clonal keratinocyte proliferation. The importance of p53 mutations for such benign cell multiplication on one band and malignant transformation on the other is unclear. Although the spectrum, type, and multiplicity of mutations were similar in both types of proliferative responses, there was a clear difference with respect to LOH. No LOH was found in 17 p53 patches. By contrast 11 of 30 precancers/cancers had LOH.
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| 41. |
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| 42. |
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| 43. |
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| 44. |
- Salvo, P., et al.
(författare)
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Fabrication and functionalization of PCB gold electrodes suitable for DNA-based electrochemical sensing
- 2014
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Ingår i: Bio-medical materials and engineering. - 0959-2989 .- 1878-3619. ; 24:4, s. 1705-1714
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Tidskriftsartikel (refereegranskat)abstract
- The request of high specificity and selectivity sensors suitable for mass production is a constant demand in medical research. For applications in point-of-care diagnostics and therapy, there is a high demand for low cost and rapid sensing platforms. This paper describes the fabrication and functionalization of gold electrodes arrays for the detection of deoxyribonucleic acid (DNA) in printed circuit board (PCB) technology. The process can be implemented to produce efficiently a large number of biosensors. We report an electrolytic plating procedure to fabricate low-density gold microarrays on PCB suitable for electrochemical DNA detection in research fields such as cancer diagnostics or pharmacogenetics, where biosensors are usually targeted to detect a small number of genes. PCB technology allows producing high precision, fast and low cost microelectrodes. The surface of the microarray is functionalized with self-assembled monolayers of mercaptoundodecanoic acid or thiolated DNA. The PCB microarray is tested by cyclic voltammetry in presence of 5 mM of the redox probe K3Fe(CN6) in 0.1 M KCl. The voltammograms prove the correct immobilization of both the alkanethiol systems. The sensor is tested for detecting relevant markers for breast cancer. Results for 5 nM of the target TACSTD1 against the complementary TACSTD1 and non-complementary GRP, MYC, SCGB2A1, SCGB2A2, TOP2A probes show a remarkable detection limit of 0.05 nM and a high specificity.
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| 45. |
- Sterky, Fredrik, et al.
(författare)
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A Populus EST resource for plant functional genomics
- 2004
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 101:38, s. 13951-13956
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Tidskriftsartikel (refereegranskat)abstract
- Trees present a life form of paramount importance for terrestrial ecosystems and human societies because of their ecological structure and physiological function and provision of energy and industrial materials. The genus Populus is the internationally accepted model for molecular tree biology. We have analyzed 102,019 Populus ESTs that clustered into 11,885 clusters and 12,759 singletons. We also provide >4,000 assembled full clone sequences to serve as a basis for the upcoming annotation of the Populus genome sequence. A public web-based EST database (POPULUSDB) provides digital expression profiles for 18 tissues that comprise the majority of differentiated organs. The coding content of Populus and Arabidopsis genomes shows very high similarity, indicating that differences between these annual and perennial angiosperm life forms result primarily from differences in gene regulation. The high similarity between Populus and Arabidopsis will allow studies of Populus to directly benefit from the detailed functional genomic information generated for Arabidopsis, enabling detailed insights into tree development and adaptation. These data will also valuable for functional genomic efforts in Arabidopsis.
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| 46. |
- Stodberg, Tommy, et al.
(författare)
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Mutations in SLC12A5 in epilepsy of infancy with migrating focal seizures
- 2015
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Ingår i: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 6
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Tidskriftsartikel (refereegranskat)abstract
- The potassium-chloride co-transporter KCC2, encoded by SLC12A5, plays a fundamental role in fast synaptic inhibition by maintaining a hyperpolarizing gradient for chloride ions. KCC2 dysfunction has been implicated in human epilepsy, but to date, no monogenic KCC2-related epilepsy disorders have been described. Here we show recessive loss-of-function SLC12A5 mutations in patients with a severe infantile-onset pharmacoresistant epilepsy syndrome, epilepsy of infancy with migrating focal seizures (EIMFS). Decreased KCC2 surface expression, reduced protein glycosylation and impaired chloride extrusion contribute to loss of KCC2 activity, thereby impairing normal synaptic inhibition and promoting neuronal excitability in this early-onset epileptic encephalopathy.
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| 47. |
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| 48. |
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| 49. |
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| 50. |
- Vener, T, et al.
(författare)
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Quantification of HIV-1 using multiple competitors in a single-tube assay
- 1996
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Ingår i: BioTechniques. - : Future Science Ltd. - 0736-6205 .- 1940-9818. ; 21:2, s. 248-&
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Tidskriftsartikel (refereegranskat)abstract
- Methods for quantification of human immunodeficiency virus type 1 (HIV-1) based on competitive PCR and fragment analysis have been developed. Samples containing HIV-1 DNA and known amounts of three cloned competitors were co-amplified by PCR with semi-nested primers. The competitor DNAs contained the same long terminal repeat primer binding sequences as the wild-type DNA, but they are different in internal sequences and length. One of the inner primers was fluorescent-labeled to allow discrimination between the wild-type DNA and the three competitors by fragment analysis using a standard automated sequencer. A calibration curve using the peak area of the three competitors enabled accurate determination of target amount with minimal variations. The method presented here can be used for quantification of HIV-1 in clinical samples and will be useful for monitoring disease progression and treatment effects.
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