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"Hague, Joshua"
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Methodology for clinical genotyping of CYP2D6 and CYP2C19
2021
Many antidepressants, atomoxetine, and several antipsychotics are metabolized by the cytochrome P450 enzymes CYP2D6 and CYP2C19, and guidelines for prescribers based on genetic variants exist. Although some laboratories offer such testing, there is no consensus regarding validated methodology for clinical genotyping of CYP2D6 and CYP2C19. The aim of this paper was to cross-validate multiple technologies for genotyping CYP2D6 and CYP2C19 against each other, and to contribute to feasibility for clinical implementation by providing an enhanced range of assay options, customizable automated translation of data into haplotypes, and a workflow algorithm. AmpliChip CYP450 and some TaqMan single nucleotide variant (SNV) and copy number variant (CNV) data in the Genome-based therapeutic drugs for depression (GENDEP) study were used to select 95 samples (out of 853) to represent as broad a range of CYP2D6 and CYP2C19 genotypes as possible. These 95 included a larger range of CYP2D6 hybrid configurations than have previously been reported using inter-technology data. Genotyping techniques employed were: further TaqMan CNV and SNV assays, xTAGv3 Luminex CYP2D6 and CYP2C19, PharmacoScan, the Ion AmpliSeq Pharmacogenomics Panel, and, for samples with CYP2D6 hybrid configurations, long-range polymerase chain reactions (L-PCRs) with Sanger sequencing and Luminex. Agena MassARRAY was also used for CYP2C19. This study has led to the development of a broader range of TaqMan SNV assays, haplotype phasing methodology with TaqMan adaptable for other technologies, a multiplex genotyping method for efficient identification of some hybrid haplotypes, a customizable automated translation of SNV and CNV data into haplotypes, and a clinical workflow algorithm.
Journal Article
Cross-validation of technologies for genotyping CYP2D6 and CYP2C19
2020
Abstract Background CYP2D6 and CYP2C19 are cytochrome P450 enzymes involved in the metabolism of many medications from multiple therapeutic classes. Associations between patterns of variants (known as haplotypes) in the genes encoding them (CYP2D6 and CYP2C19) and enzyme activities are well described. The genes in fact comprise 21% of biomarkers in drug labels. Despite this, genotyping is not common, partly attributable to its challenging nature (CYP2D6 having >100 haplotypes, including those with sequence from an adjacent pseudogene, and gene duplications). We cross-validated different methodologies for identifying haplotypes in these genes against each other. Methods Ninety-two samples with a variety of CYP2D6 and CYP2C19 genotypes according to prior AmpliChip CYP450 and TaqMan CYP2C19*17 data were selected from the Genome-based therapeutic drugs for depression (GENDEP) study. Genotyping was performed with TaqMan copy number variant (CNV) and single nucleotide variant (SNV) analysis, the next generation sequencing-based Ion S5 AmpliSeq Pharmacogenomics Panel, PharmacoScan, long-range polymerase chain reaction (L-PCR) followed by amplicon analysis, and Agena for CYP2C19. Variant pattern to haplotype translation was automated. Results The inter-platform concordance for CYP2C19 was high (up to 100% for available data). For CYP2D6, the IonS5-PharmacoScan concordance was 94% for a range of variants tested apart from those with at least one extra copy of a CYP2D6 gene (occurring at a frequency of 3.8%, 33/853), or those with substantial sequence derived from pseudogene, known as hybrids (3%, 26/853). Conclusions Inter-platform concordance for CYP2C19 was high, and, moreover, the Ion S5 and PharmacoScan data were 100% concordant with that from a TaqMan CYP2C19*2 assay. We have also demonstrated feasibility of using an NGS platform for genotyping CYP2D6 and CYP2C19, with automated data interpretation methodology. This points the way to a method of making CYP2D6 and CYP2C19 genotyping more readily accessible. Competing Interest Statement N.H. has participated in research supported by CSF project No. IP-09-2014-2979. D.S. has received grant/research support from Janssen and Lundbeck, and has served as a consultant or on advisory boards for Janssen and Lundbeck. C.A.B. is a member of the Clinical Pharmacogenetics Implementation Consortium and the Pharmacogene Variation Consortium; he has also participated in collaborative research with employees of MyDNA (a pharmacogenetic testing company) but does not have equity, stocks, or options in this company or any other pharmacogenetic companies. K.J.A. is a member of the Clinical Pharmacogenetics Implementation Consortium and the Pharmacogene Variation Consortium, has received two research grants in the last two years from Janssen Inc., Canada (fellowship grants for trainees) and provided consultancy services (unpaid) for HLS Therapeutics. All other authors have nothing to disclose. Footnotes * Updated authors, disclosures, and updates to the paper including added data to tables and supplemental files.
Milosevic trial judge steps down
2004
His retirement will cause further postponement in the war crimes trial of the former Yugoslav president, whose own illness has delayed proceedings at The Hague.
Newspaper Article
Enzalutamide with Standard First-Line Therapy in Metastatic Prostate Cancer
by
McJannett, Margaret
,
Reaume, M. Neil
,
Zielinski, Robert R
in
Adenocarcinoma - drug therapy
,
Adenocarcinoma - mortality
,
Adenocarcinoma - secondary
2019
In men with metastatic, hormone-sensitive prostate cancer who were receiving testosterone suppression, the addition of enzalutamide led to significantly longer progression-free and overall survival than the addition of standard nonsteroidal antiandrogen therapy. The better outcome was less clear among patients who had received docetaxel.
Journal Article
Diversity analysis of cotton (Gossypium hirsutum L.) germplasm using the CottonSNP63K Array
by
Percy, Richard G.
,
Lacape, Jean-Marc
,
Pepper, Alan E.
in
Agriculture
,
Alleles
,
Biomedical and Life Sciences
2017
Background
Cotton germplasm resources contain beneficial alleles that can be exploited to develop germplasm adapted to emerging environmental and climate conditions. Accessions and lines have traditionally been characterized based on phenotypes, but phenotypic profiles are limited by the cost, time, and space required to make visual observations and measurements. With advances in molecular genetic methods, genotypic profiles are increasingly able to identify differences among accessions due to the larger number of genetic markers that can be measured. A combination of both methods would greatly enhance our ability to characterize germplasm resources. Recent efforts have culminated in the identification of sufficient SNP markers to establish high-throughput genotyping systems, such as the CottonSNP63K array, which enables a researcher to efficiently analyze large numbers of SNP markers and obtain highly repeatable results. In the current investigation, we have utilized the SNP array for analyzing genetic diversity primarily among cotton cultivars, making comparisons to SSR-based phylogenetic analyses, and identifying loci associated with seed nutritional traits.
Results
The SNP markers distinctly separated
G. hirsutum
from other
Gossypium
species and distinguished the wild from cultivated types of
G. hirsutum
. The markers also efficiently discerned differences among cultivars, which was the primary goal when designing the CottonSNP63K array. Population structure within the genus compared favorably with previous results obtained using SSR markers, and an association study identified loci linked to factors that affect cottonseed protein content.
Conclusions
Our results provide a large genome-wide variation data set for primarily cultivated cotton. Thousands of SNPs in representative cotton genotypes provide an opportunity to finely discriminate among cultivated cotton from around the world. The SNPs will be relevant as dense markers of genome variation for association mapping approaches aimed at correlating molecular polymorphisms with variation in phenotypic traits, as well as for molecular breeding approaches in cotton.
Journal Article
Development of a 63K SNP Array for Cotton and High-Density Mapping of Intraspecific and Interspecific Populations of Gossypium spp
2015
High-throughput genotyping arrays provide a standardized resource for plant breeding communities that are useful for a breadth of applications including high-density genetic mapping, genome-wide association studies (GWAS), genomic selection (GS), complex trait dissection, and studying patterns of genomic diversity among cultivars and wild accessions. We have developed the CottonSNP63K, an Illumina Infinium array containing assays for 45,104 putative intraspecific single nucleotide polymorphism (SNP) markers for use within the cultivated cotton species Gossypium hirsutum L. and 17,954 putative interspecific SNP markers for use with crosses of other cotton species with G. hirsutum. The SNPs on the array were developed from 13 different discovery sets that represent a diverse range of G. hirsutum germplasm and five other species: G. barbadense L., G. tomentosum Nuttal × Seemann, G. mustelinum Miers × Watt, G. armourianum Kearny, and G. longicalyx J.B. Hutchinson and Lee. The array was validated with 1,156 samples to generate cluster positions to facilitate automated analysis of 38,822 polymorphic markers. Two high-density genetic maps containing a total of 22,829 SNPs were generated for two F2 mapping populations, one intraspecific and one interspecific, and 3,533 SNP markers were co-occurring in both maps. The produced intraspecific genetic map is the first saturated map that associates into 26 linkage groups corresponding to the number of cotton chromosomes for a cross between two G. hirsutum lines. The linkage maps were shown to have high levels of collinearity to the JGI G. raimondii Ulbrich reference genome sequence. The CottonSNP63K array, cluster file and associated marker sequences constitute a major new resource for the global cotton research community.
Journal Article
Practical guidance for running late-phase platform protocols for clinical trials: lessons from experienced UK clinical trials units
by
Snowdon, Claire
,
Pallmann, Philip
,
James, Nicholas
in
Adaptive Clinical Trials as Topic
,
Aspirin
,
Basket trials
2022
Background
Late-phase platform protocols (including basket, umbrella, multi-arm multi-stage (MAMS), and master protocols) are generally agreed to be more efficient than traditional two-arm clinical trial designs but are not extensively used. We have gathered the experience of running a number of successful platform protocols together to present some operational recommendations.
Methods
Representatives of six UK clinical trials units with experience in running late-phase platform protocols attended a 1-day meeting structured to discuss various practical aspects of running these trials. We report and give guidance on operational aspects which are either harder to implement compared to a traditional late-phase trial or are specific to platform protocols.
Results
We present a list of practical recommendations for trialists intending to design and conduct late-phase platform protocols. Our recommendations cover the entire life cycle of a platform trial: from protocol development, obtaining funding, and trial set-up, to a wide range of operational and regulatory aspects such as staffing, oversight, data handling, and data management, to the reporting of results, with a particular focus on communication with trial participants and stakeholders as well as public and patient involvement.
Discussion
Platform protocols enable many questions to be answered efficiently to the benefit of patients. Our practical lessons from running platform trials will support trial teams in learning how to run these trials more effectively and efficiently.
Journal Article
War crimes suspect makes court history
He was led into the court's windowless temporary courtroom, constructed in the car park of a modern office block. The court has no dock, and [Thomas Lubanga] sat on the defence benches behind Jean Flamme, a Belgian lawyer assigned by the court. In stark contrast to defendants such as Slobodan Milosevic and Saddam Hussein, he made no political speeches and no attempt to browbeat the judges. Demonstrating a good command of French learned in the former Belgian colony, Lubanga politely told the judges that there was no need for them to read out the warrant for his arrest. Sitting last month as one of the ICC's pre-trial chambers, the three judges issued a warrant for Lubanga's arrest on charges of enlisting and conscripting children under the age of 15 and using them to take an active part in hostilities.
Newspaper Article
Israel's wall will kill peace hopes, UN court told
If Israel had intended the barrier as a temporary defensive measure against suicide bombers, it would have been run along the pre-1967 borders, not almost entirely in occupied Palestinian land, he said. The barrier was not about security, but about entrenching the occupation and annexing Palestinian land. The Israeli submission emphasised that the road map called for an end to Palestinian terrorist attacks on Israel, to be matched by an end to Israeli military action in response. In his opening submission to the court, Dr [Nasser Al-Kidwa] condemned the suicide bombings in Israel, declaring them unlawful and \"harmful to the just and honourable cause of the Palestinian people\". But, he continued, the first such attack did not take place until \"nearly 27 years after the onset of this oppressive military occupation\". Suicide bombings were the result of Israeli policies, not the cause.
Newspaper Article