ORCID Profile
0000-0001-9702-9245
Current Organisations
Københavns Universitet
,
KU Leuven
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Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.23814641.V1
Abstract: supplementary materials
Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.23814635.V1
Abstract: Selected characteristics of the participants.
Publisher: Elsevier BV
Date: 05-2014
DOI: 10.1016/J.BBAPAP.2014.01.018
Abstract: The timely detection of gastric cancer will contribute significantly towards effective treatment and is aided by the availability and reliability of appropriate biomarkers. A combination of several biomarkers can improve the sensitivity and specificity of cancer detection and this work reports results from a panel of 4 proteins. By combining a validated preclinical mouse model with a proteomic approach we have recently discovered novel biomarkers for the detection of gastric cancer. Here, we investigate the specificity of four of those biomarkers (afamin, clusterin, VDBP and haptoglobin) for the detection of gastric cancer using two independent methods of validation: ELISA, and a non antibody based method: Multiple Reaction Monitoring with High Resolution Mass Spectrometry (MRM-HR). All four biomarkers reliably differentiated GC from benign patient serum, and also in a small cohort of 11 early stage cases. We also present a novel isoform specific biomarker alpha-1-antitrypsin (A1AT) that was identified using a mouse model for gastric cancer. This isoform is distinct in charge and mobility in a pH gradient and was validated using human s les by isoelectric focussing and Western-blot (IEF-WB). This article is part of a Special Issue entitled: Biomarkers: A Proteomic Challenge.
Publisher: Humana Press
Date: 2009
DOI: 10.1007/978-1-60761-157-8_4
Abstract: Numerous protein detection and quantitation methods for gel-based proteomics have been devised that can be classified in three major categories: (1) Universal (or "general") detection techniques, which include staining with anionic dyes (e.g., Coomassie brilliant blue), reverse (or "negative") staining with metal cations (e.g., imidazole-zinc), silver staining, fluorescent staining or labeling, and radiolabeling, (2) specific staining methods for the detection of post-translational modifications (e.g., glycosylation or phosphorylation), and (3) differential display techniques for the separation of multiple, covalently tagged s les in a single two-dimensional electrophoresis (2-DE) gel, followed by consecutive and independent visualization of these proteins to minimize methodical variations in spot positions and in protein abundance, to simplify image analysis, as well as to improve protein quantitation by including an internal standard. The most important properties of protein detection methods applied in proteome analysis include high sensitivity (i.e., low detection limit), wide linear dynamic range for quantitative accuracy, reproducibility, cost-efficiency, ease of use, and compatibility with downstream protein identification or characterization technologies, such as mass spectrometry (MS). Regrettably, no single detection method meets all these requirements, albeit fluorescence-based technologies are currently favored for most applications hence, the major focus of this chapter is on fluorescent-dye-based protein detection and quantitation techniques. Although satisfying results with respect to sensitivity and reproducibility are also obtained by methods based on radioactive labeling of proteins (which is still unsurpassed in terms of sensitivity), radiolabeling is, however, largely impractical for routine proteomic profiling because of the costs and the health and safety concerns associated with handling radioactive compounds.
Publisher: Wiley
Date: 27-11-2020
DOI: 10.1002/JMS.4689
Publisher: Springer Science and Business Media LLC
Date: 09-02-2016
DOI: 10.1007/S00253-016-7344-8
Abstract: Beer spoilage microorganisms present a major risk for the brewing industry and can lead to cost-intensive recall of contaminated products and damage to brand reputation. The applicability of molecular profiling using matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF MS) in combination with Biotyper software was investigated for the identification of beer spoilage microorganisms from routine brewery quality control s les. Reference mass spectrum profiles for three of the most common bacterial beer spoilage microorganisms (Lactobacillus lindneri, Lactobacillus brevis and Pediococcus damnosus), four commercially available brewing yeast strains (top- and bottom-fermenting) and Dekkera/Brettanomyces bruxellensis wild yeast were established, incorporated into the Biotyper reference library and validated by successful identification after inoculation into beer. Each bacterial species could be accurately identified and distinguished from one another and from over 5600 other microorganisms present in the Biotyper database. In addition, wild yeast contaminations were rapidly detected and distinguished from top- and bottom-fermenting brewing strains. The applicability and integration of mass spectrometry profiling using the Biotyper platform into existing brewery quality assurance practices within industry were assessed by analysing routine microbiology control s les from a local brewery, where contaminating microorganisms could be reliably identified. Brewery-isolated microorganisms not present in the Biotyper database were further analysed for identification using LC-MS/MS methods. This renders the Biotyper platform a promising candidate for biological quality control testing within the brewing industry as a more rapid, high-throughput and cost-effective technology that can be tailored for the detection of brewery-specific spoilage organisms from the local environment.
Publisher: American Chemical Society (ACS)
Date: 13-04-2017
DOI: 10.1021/ACS.JPROTEOME.6B01032
Abstract: The evolutionary conserved family of 14-3-3 proteins appears to have a role in integrating numerous intracellular pathways, including signal transduction, intracellular trafficking, and metabolism. However, little is known about how this interactive network might be affected by the direct abrogation of 14-3-3 function. The loss of Drosophila 14-3-3ε resulted in reduced survival of mutants during larval-to-adult transition, which is known to depend on an energy supply coming from the histolysis of fat body tissue. Here we report a differential proteomic analysis of larval fat body tissue at the onset of larval-to-adult transition, with the loss of 14-3-3ε resulting in the altered abundance of 16 proteins. These included proteins linked to protein biosynthesis, glycolysis, tricarboxylic acid cycle, and lipid metabolic pathways. The ecdysone receptor (EcR), which is responsible for initiating the larval-to-adult transition, colocalized with 14-3-3ε in wild-type fat body tissues. The altered protein abundance in 14-3-3ε mutant fat body tissue was associated with transcriptional deregulation of alcohol dehydrogenase, fat body protein 1, and lamin genes, which are known targets of the EcR. This study indicates that 14-3-3ε has a critical role in cellular metabolism involving either molecular crosstalk with the EcR or direct interaction with metabolic proteins.
Publisher: Frontiers Media SA
Date: 25-09-2020
Publisher: Elsevier BV
Date: 08-2007
DOI: 10.1016/J.CHEMOSPHERE.2007.04.075
Abstract: The herbicide 2,4-dichlorophenoxy acetic acid (2,4-D) induces a wide spectrum of toxic responses in living organisms. In this study, we analyzed the stress-induced responses of Corynebacterium glutamicum cells on protein level upon treatment with 2,4-D. For this, growing C. glutamicum cells were exposed to sublethal concentrations of 2,4-D, and changes of the gene expression profiles in comparison to non-exposed organisms were analyzed by two-dimensional gel electrophoresis and mass spectrometry. 2,4-D induced the over-expression of at least six C. glutamicum proteins, four of which could be identified by MALDI-TOF-MS. One protein (Cg2521 long-chain acyl-CoA synthetase) was related to the energy metabolism, and two proteins were involved in cell envelope synthesis (Cg2410 glutamine-dependent amidotransferase, and Cg1672 glycosyltransferase). The last induced protein was the ABC type transport system (Cg2695, ATPase component). The newly observed proteins, except for the ABC transport system, were not in general stress-related proteins, but were specifically expressed upon 2,4-D exposure and, therefore, can be used as respective biomarkers. Moreover, since these proteins seem to play a pivotal role in the adaptation of the cell to 2,4-D, they may help to gain deeper insight into the damage mechanisms of 2,4-D induced in the living cell.
Publisher: Springer New York
Date: 2019
Publisher: The Institute of Brewing & Distilling
Date: 2022
DOI: 10.1002/JIB.698
Publisher: Cold Spring Harbor Laboratory
Date: 11-12-2020
DOI: 10.1101/2020.12.10.419747
Abstract: Mutation of the CDKL5 kinase gene leads to the seizure-prone neurodevelopmental condition CDD (CDKL5 deficiency disorder) and is the most common genetic cause of childhood epilepsy. However, the phospho-targets and roles of CDKL5 are poorly understood, especially in the nucleus. We reveal CDKL5 as a sensor of DNA damage in actively transcribed regions of the nucleus, which phosphorylates transcriptional regulators such as Elongin A (ELOA) on a specific consensus motif. Recruitment of CDKL5 and ELOA to DNA damage sites, and subsequent ELOA phosphorylation, requires both active transcription and synthesis of poly–ADP ribose to which CDKL5 can bind. Critically, CDKL5 is essential for transcriptional control at DNA breaks. Therefore, CDKL5 is a DNA damage-sensing regulator of transcription, with implications for CDKL5-related human diseases. CDKL5 is a DNA damage-sensing kinase that modulates transcriptional activity near DNA breaks.
Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.23814632.V1
Abstract: Summary of G × BMI analyses using 1DF, two-step, and 3DF analyses.
Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.C.6769316
Abstract: Abstract Colorectal cancer risk can be impacted by genetic, environmental, and lifestyle factors, including diet and obesity. Gene-environment interactions (G × E) can provide biological insights into the effects of obesity on colorectal cancer risk. Here, we assessed potential genome-wide G × E interactions between body mass index (BMI) and common SNPs for colorectal cancer risk using data from 36,415 colorectal cancer cases and 48,451 controls from three international colorectal cancer consortia (CCFR, CORECT, and GECCO). The G × E tests included the conventional logistic regression using multiplicative terms (one degree of freedom, 1DF test), the two-step EDGE method, and the joint 3DF test, each of which is powerful for detecting G × E interactions under specific conditions. BMI was associated with higher colorectal cancer risk. The two-step approach revealed a statistically significant G×BMI interaction located within the Formin 1/Gremlin 1 ( i FMN1/GREM1 /i ) gene region (rs58349661). This SNP was also identified by the 3DF test, with a suggestive statistical significance in the 1DF test. Among participants with the CC genotype of rs58349661, overweight and obesity categories were associated with higher colorectal cancer risk, whereas null associations were observed across BMI categories in those with the TT genotype. Using data from three large international consortia, this study discovered a locus in the i FMN1/GREM1 /i gene region that interacts with BMI on the association with colorectal cancer risk. Further studies should examine the potential mechanisms through which this locus modifies the etiologic link between obesity and colorectal cancer. Significance: This gene-environment interaction analysis revealed a genetic locus in FMN1/GREM1 that interacts with body mass index in colorectal cancer risk, suggesting potential implications for precision prevention strategies. /
Publisher: Wiley
Date: 16-04-2014
Abstract: Blue native PAGE (BN-PAGE) is a powerful method to separate protein complexes while preserving their native state. However, the resolution of the method is limited as complexes with similar molecular masses cannot be resolved. Here we describe native 2DE using immobilized pH-gradients in combination with BN-PAGE to resolve protein complexes by their pI and molecular mass. This method enables electrophoretic separation of proteins between pI 3 and 10 and can resolve molecular masses up to 1.2 MDa. Visualized gel spots at large molecular weight were identified using MS to confirm potential protein complexes. Several protein complexes could be identified, most prominent GroEL in complex with GroES, parts of the ribosomal machinery and membrane transport system. In summary, this method enables easy high-resolution electrophoretic separation of protein complexes.
Publisher: Wiley
Date: 06-10-2022
DOI: 10.1111/JCMM.17574
Abstract: Age‐related diseases account for a high proportion of the total global burden of disease. Despite recent advances in understanding their molecular basis, there is a lack of suitable early biomarkers to test selected compounds and accelerate their translation to clinical trials. We have investigated the utility of in vivo stress reporter systems as surrogate early biomarkers of the degenerative disease progression. We hypothesized that cellular stress observed in models of human degenerative disease preceded overt cellular damage and at the same time will identify potential cytoprotective pathways. To test this hypothesis, we generated novel accelerated ageing (progeria) reporter mice by crossing the LmnaG609G mice into our oxidative stress/inflammation (Hmox1) and DNA damage (p21) stress reporter models. Histological analysis of reporter expression demonstrated a time‐dependent and tissue‐specific activation of the reporters in tissues directly associated with Progeria, including smooth muscle cells, the vasculature and gastrointestinal tract. Importantly, reporter expression was detected prior to any perceptible deleterious phenotype. Reporter expression can therefore be used as an early marker of progeria pathogenesis and to test therapeutic interventions. This work also demonstrates the potential to use stress reporter approaches to study and find new treatments for other degenerative diseases.
Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.23814632
Abstract: Summary of G × BMI analyses using 1DF, two-step, and 3DF analyses.
Publisher: Cold Spring Harbor Laboratory
Date: 03-04-2023
DOI: 10.1101/2023.04.03.535285
Abstract: The ATR kinase protects cells against DNA damage and replication stress and represents a promising anti-cancer drug target. The ATR inhibitors (ATRi) berzosertib and gartisertib are in clinical trials for treatment of advanced solid tumours as monotherapy or in combination with genotoxic agents. However, the pharmacodynamic ATR biomarker phospho-CHK1 has shown limited sensitivity in for quantitative assessment of ATR activity in clinical trials. Therefore, better biomarkers are needed, and with this in mind we carried out quantitative phospho-proteomic screening for ATR biomarkers that are highly sensitive to berzosertib and gartisertib. Screening identified novel ATR-dependent targets in three broad classes: i) targets whose phosphorylation is highly sensitive to ATRi ii) novel targets with known genome maintenance roles iii) novel targets whose cellular roles are unclear, including SCAF1. We show that SCAF1 interacts with RNAPII in a phospho-dependent manner and suppresses homologous recombination in cells lacking the BRCA1 tumour suppressor. Taken together these data reveal potential new ATR biomarkers and new genome maintenance factors.
Publisher: The Institute of Brewing & Distilling
Date: 23-05-2017
DOI: 10.1002/JIB.428
Publisher: Wiley
Date: 17-05-2016
Abstract: Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) is a mass spectrometry technique used for the analysis of macromolecules on an intact tissue of interest, thereby allowing the assessment of molecular signatures in health and disease in the anatomical context. MALDI-MSI is increasingly used to investigate neurodegenerative and psychiatric disorders at the molecular level, including Alzheimer's disease (AD), Parkinson's disease (PD), and schizophrenia (SCZ). These illnesses are characterized by complex neuropathological processes, and conventional proteomic techniques investigating brain tissue homogenates have inherent limitations in determining the precise anatomical or cellular location of proteomic findings. In this article, we review MALDI-MSI studies on neurodegenerative and psychiatric disorders, and explore whether the technique could accelerate the translation of proteomic information into improved understanding and ultimately better therapeutic applications.
Publisher: Springer Science and Business Media LLC
Date: 26-05-2017
DOI: 10.1038/S41598-017-02465-X
Abstract: Streptococcus pneumoniae (the pneumococcus) is a human pathogen, accounting for massive global morbidity and mortality. Although asymptomatic colonization of the nasopharynx almost invariably precedes disease, the critical determinants enabling pneumococcal progression from this niche to cause invasive disease are poorly understood. One mechanism proposed to be central to this transition involves opacity phase variation, whereby pneumococci harvested from the nasopharynx are typically transparent, while those simultaneously harvested from the blood are opaque. Here, we used two dimensional-differential gel electrophoresis (2D-DIGE) to compare protein expression profiles of transparent and opaque variants of 3 pneumococcal strains, D39 (serotype 2), WCH43 (serotype 4) and WCH16 (serotype 6A) in vitro . One spot comprising a mixture of capsular polysaccharide biosynthesis protein and other proteins was significantly up-regulated in the opaque phenotype in all 3 strains other proteins were differentially regulated in a strain-specific manner. We conclude that pneumococcal phase variation is a complex and multifactorial process leading to strain-specific pathogenicity.
Publisher: Oxford University Press (OUP)
Date: 2016
DOI: 10.1039/C6MT00142D
Abstract: The metal-resistant β-proteobacterium Cupriavidus metallidurans drives gold (Au) biomineralisation and the (trans)formation of Au nuggets largely via unknown biochemical processes, ultimately leading to the reductive precipitation of mobile, toxic Au(i/iii)-complexes. In this study proteomic responses of C. metallidurans CH34 to mobile, toxic Au(iii)-chloride are investigated. Cells were grown in the presence of 10 and 50 μM Au(iii)-chloride, 50 μM Cu(ii)-chloride and without additional metals. Differentially expressed proteins were detected by difference gel electrophoresis and identified by liquid chromatography coupled mass spectrometry. Proteins that were more abundant in the presence of Au(iii)-chloride are involved in a range of important cellular functions, e.g., metabolic activities, transcriptional regulation, efflux and metal transport. To identify Au-binding proteins, protein extracts were separated by native 2D gel electrophoresis and Au in protein spots was detected by laser absorption inductively coupled plasma mass spectrometry. A chaperon protein commonly understood to bind copper (Cu), CupC, was identified and shown to bind Au. This indicates that it forms part of a multi-metal detoxification system and suggests that similar/shared detoxification pathways for Au and Cu exist. Overall, this means that C. metallidurans CH34 is able to mollify the toxic effects of cytoplasmic Au(iii) by sequestering this Au-species. This effect may in the future be used to develop CupC-based biosensing capabilities for the in-field detection of Au in exploration s les.
Publisher: Wiley
Date: 19-02-2015
Abstract: Difference gel electrophoresis enables the accurate quantification of changes in the proteome including combinations of PTMs and protein isoform expression. Here, we review recent advances in study design, image acquisition, and statistical analysis. We also compare DIGE to established and emerging mass spectrometric analysis technologies. Despite these recent advances in MS and the still unsolved limitations of 2DE to map hydrophobic, high molecular weight proteins with extreme pIs, DIGE remains the most comprehensive top-down method to study changes in abundance of intact proteins.
Publisher: American Chemical Society (ACS)
Date: 19-09-2016
DOI: 10.1021/ACS.JPROTEOME.6B00053
Abstract: Although acetylation is regarded as a common protein modification, a detailed proteome-wide profile of this post-translational modification may reveal important biological insight regarding differential acetylation of in idual proteins. Here we optimized a novel peptide IEF fractionation method for use prior to LC-MS/MS analysis to obtain a more in depth coverage of N-terminally acetylated proteins from complex s les. Application of the method to the analysis of the serous ovarian cancer cell line OVCAR-5 identified 344 N-terminally acetylated proteins, 12 of which are previously unreported. The protein peptidyl-prolyl cis-trans isomerase A (PPIA) was detected in both the N-terminally acetylated and unmodified forms and was further analyzed by data-independent acquisition in carboplatin-responsive parental OVCAR-5 cells and carboplatin-resistant OVCAR-5 cells. This revealed a higher ratio of unacetylated to acetylated N-terminal PPIA in the parental compared with the carboplatin-resistant OVCAR-5 cells and a 4.1-fold increase in PPIA abundance overall in the parental cells relative to carboplatin-resistant OVCAR-5 cells (P = 0.015). In summary, the novel IEF peptide fractionation method presented here is robust, reproducible, and can be applied to the profiling of N-terminally acetylated proteins. All mass spectrometry data is available as a ProteomeXchange repository (PXD003547).
Publisher: Wiley
Date: 12-2008
Abstract: Proteome analysis was combined with whole‐cell metabolic fingerprinting to gain insight into the physiology of mature biofilm in Bordetella pertussis , the agent responsible for whooping cough. Recent reports indicate that B. pertussis adopts a sessile biofilm as a strategy to persistently colonize the human host. However, since research in the past mainly focused on the planktonic lifestyle of B. pertussis , knowledge on biofilm formation of this important human pathogen is still limited. Comparative studies were carried out by combining 2‐DE and Fourier transform infrared (FT‐IR) spectroscopy with multivariate statistical methods. These complementary approaches demonstrated that biofilm development has a distinctive impact on B. pertussis physiology. Results from MALDI‐TOF/MS identification of proteins together with results from FT‐IR spectroscopy revealed the biosynthesis of a putative acidic‐type polysaccharide polymer as the most distinctive trait of B. pertussis life in a biofilm. Additionally, expression of proteins known to be involved in cellular regulatory circuits, cell attachment and virulence was altered in sessile cells, which strongly suggests a significant impact of biofilm development on B. pertussis pathogenesis. In summary, our work showed that the combination of proteomics and FT‐IR spectroscopy with multivariate statistical analysis provides a powerful tool to gain further insight into bacterial lifestyles.
Publisher: EMBO
Date: 28-09-2018
Publisher: The Institute of Brewing & Distilling
Date: 2021
DOI: 10.1002/JIB.664
Publisher: MDPI AG
Date: 09-08-2012
DOI: 10.3390/IJMS13089942
Publisher: EMBO
Date: 04-10-2021
Publisher: Wiley
Date: 06-2009
Abstract: In order to overcome the limitations of carrier holyte generated pH gradients, IPGs were developed in the late 1970s. However, the 2-DE pattern we included in the first publication on IEF with IPGs [Bjellqvist et al., J. Biochem. Biophys. Methods 1982, 6, 317-339] was far from being competitive to O'Farrell's high-resolution 2-DE with carrier holytes. Our 2-DE pattern in this article was, more or less, only a proof of principle. It was, however, the beginning of a long journey of stepwise improved 2-DE protocols we developed in our laboratory and summarized in the reviews published in Electrophoresis 1988, 9, 531-546 and in Electrophoresis 2000, 21, 1037-1053. Milestones were the design of the IPG strip, and the "reduction-alkylation equilibration protocol" of IPG strips after IEF for the efficient transfer of proteins from first to second dimension. The protocol of 2-DE with IPGs has been constantly refined, e.g. by the generation of tailor-made IPGs with different pH intervals from the acidic to the basic extremes (pH 2.5-12), and extended separation distances for improved resolution. In the present review, a historical outline from the technical difficulties encountered during the development of 2-DE with IPGs, to the establishment of the actual "standard protocol" will be given, as well as the modified procedures for the separation of very acidic, very alkaline, low-abundance and hydrophobic proteins, followed by a brief discussion of the advantages and technical challenges of gel-based proteomic technologies.
Publisher: MDPI AG
Date: 22-08-2012
Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.23814641
Abstract: supplementary materials
Publisher: Elsevier BV
Date: 07-2023
Publisher: American Association for Cancer Research (AACR)
Date: 30-05-2023
DOI: 10.1158/0008-5472.CAN-22-3713
Abstract: This gene-environment interaction analysis revealed a genetic locus in FMN1/GREM1 that interacts with body mass index in colorectal cancer risk, suggesting potential implications for precision prevention strategies.
Publisher: American Association for Cancer Research (AACR)
Date: 08-2023
DOI: 10.1158/0008-5472.C.6769316.V1
Abstract: Abstract Colorectal cancer risk can be impacted by genetic, environmental, and lifestyle factors, including diet and obesity. Gene-environment interactions (G × E) can provide biological insights into the effects of obesity on colorectal cancer risk. Here, we assessed potential genome-wide G × E interactions between body mass index (BMI) and common SNPs for colorectal cancer risk using data from 36,415 colorectal cancer cases and 48,451 controls from three international colorectal cancer consortia (CCFR, CORECT, and GECCO). The G × E tests included the conventional logistic regression using multiplicative terms (one degree of freedom, 1DF test), the two-step EDGE method, and the joint 3DF test, each of which is powerful for detecting G × E interactions under specific conditions. BMI was associated with higher colorectal cancer risk. The two-step approach revealed a statistically significant G×BMI interaction located within the Formin 1/Gremlin 1 ( i FMN1/GREM1 /i ) gene region (rs58349661). This SNP was also identified by the 3DF test, with a suggestive statistical significance in the 1DF test. Among participants with the CC genotype of rs58349661, overweight and obesity categories were associated with higher colorectal cancer risk, whereas null associations were observed across BMI categories in those with the TT genotype. Using data from three large international consortia, this study discovered a locus in the i FMN1/GREM1 /i gene region that interacts with BMI on the association with colorectal cancer risk. Further studies should examine the potential mechanisms through which this locus modifies the etiologic link between obesity and colorectal cancer. Significance: This gene-environment interaction analysis revealed a genetic locus in FMN1/GREM1 that interacts with body mass index in colorectal cancer risk, suggesting potential implications for precision prevention strategies. /
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Florian Weiland.