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Results: 1 to 10 of 478

Publication Record


The Role of the EGF Receptor in Sex Differences in Kidney Injury.
Zhang MZ, Sasaki K, Li Y, Li Z, Pan Y, Jin GN, Wang Y, Niu A, Wang S, Fan X, Chen JC, Borza C, Yang H, Pozzi A, Fogo AB, Harris RC
(2019) J Am Soc Nephrol 30: 1659-1673
MeSH Terms: Age Factors, Alleles, Animals, Castration, Cell Line, ErbB Receptors, Erlotinib Hydrochloride, Female, Gain of Function Mutation, Humans, Kidney, Male, Mice, Mice, Inbred C57BL, Middle Aged, Ovariectomy, Podocytes, Protein Kinase Inhibitors, RNA, Messenger, Renal Insufficiency, Chronic, Sex Factors, Testosterone
Show Abstract · Added August 7, 2019
BACKGROUND - Sex differences mediating predisposition to kidney injury are well known, with evidence indicating lower CKD incidence rates and slower decline in renal function in nondiabetic CKD for premenopausal women compared with men. However, signaling pathways involved have not been elucidated to date. The EGF receptor (EGFR) is widely expressed in the kidney in glomeruli and tubules, and persistent and dysregulated EGFR activation mediates progressive renal injury.
METHODS - To investigate the sex differences in response to renal injury, we examined EGFR expression in mice, in human kidney tissue, and in cultured cell lines.
RESULTS - In wild type mice, renal mRNA and protein EGFR levels were comparable in males and females at postnatal day 7 but were significantly lower in age-matched adult females than in adult males. Similar gender differences in renal EGFR expression were detected in normal adult human kidneys. In Dsk5 mutant mice with a gain-of-function allele that increases basal EGFR kinase activity, males had progressive glomerulopathy, albuminuria, loss of podocytes, and tubulointerstitial fibrosis, but female Dsk5 mice had minimal kidney injury. Oophorectomy had no effect on renal EGFR levels in female Dsk5 mice, while castration protected against the kidney injury in male Dsk5 mice, in association with a reduction in EGFR expression to levels seen in females. Conversely, testosterone increased EGFR expression and renal injury in female Dsk5 mice. Testosterone directly stimulated EGFR expression in cultured kidney cells.
CONCLUSIONS - These studies indicate that differential renal EGFR expression plays a role in the sex differences in susceptibility to progressive kidney injury that may be mediated at least in part by testosterone.
Copyright © 2019 by the American Society of Nephrology.
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22 MeSH Terms
A Rapid Allele-Specific Assay for HLA-A*32:01 to Identify Patients at Risk for Vancomycin-Induced Drug Reaction with Eosinophilia and Systemic Symptoms.
Rwandamuriye FX, Chopra A, Konvinse KC, Choo L, Trubiano JA, Shaffer CM, Watson M, Mallal SA, Phillips EJ
(2019) J Mol Diagn 21: 782-789
MeSH Terms: Alleles, Anti-Bacterial Agents, Base Sequence, Drug Hypersensitivity Syndrome, Eosinophilia, Genetic Testing, HLA-A Antigens, Humans, Polymerase Chain Reaction, Sequence Homology, Vancomycin
Show Abstract · Added March 30, 2020
Human leukocyte antigen (HLA) alleles have been implicated as risk factors for immune-mediated adverse drug reactions. The authors recently reported a strong association between HLA-A*32:01 and vancomycin-induced drug reaction with eosinophilia and systemic symptoms. Identification of individuals with the risk allele before or shortly after the initiation of vancomycin therapy is of great clinical importance to prevent morbidity and mortality, and improve drug safety and antibiotic treatment options. A prerequisite to the success of pharmacogenetic screening tests is the development of simple, robust, cost-effective single HLA allele test that can be implemented in routine diagnostic laboratories. In this study, the authors developed a simple, real-time allele-specific PCR for typing the HLA-A*32:01 allele. Four-hundred and fifty-eight DNA samples including 30 HLA-A*32:01-positive samples were typed by allele-specific PCR. Compared with American Society for Histocompatibility and Immunogenetics-accredited, sequence-based, high-resolution, full-allelic HLA typing, this assay demonstrates 100% accuracy, 100% sensitivity (95% CI, 88.43% to 100%), and 100% specificity (95% CI, 99.14% to 100%). The lowest limit of detection of this assay using PowerUp SYBR Green is 10 ng of template DNA. The assay demonstrates a sensitivity and specificity to differentiate the HLA-A*32:01 allele from closely related non-HLA-A*32 alleles and may be used in clinical settings to identify individuals with the risk allele before or during the course of vancomycin therapy.
Copyright © 2019 American Society for Investigative Pathology and the Association for Molecular Pathology. Published by Elsevier Inc. All rights reserved.
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11 MeSH Terms
On-target Resistance to the Mutant-Selective EGFR Inhibitor Osimertinib Can Develop in an Allele-Specific Manner Dependent on the Original EGFR-Activating Mutation.
Brown BP, Zhang YK, Westover D, Yan Y, Qiao H, Huang V, Du Z, Smith JA, Ross JS, Miller VA, Ali S, Bazhenova L, Schrock AB, Meiler J, Lovly CM
(2019) Clin Cancer Res 25: 3341-3351
MeSH Terms: Acrylamides, Alleles, Aniline Compounds, Carcinoma, Non-Small-Cell Lung, Cell Line, Tumor, Dose-Response Relationship, Drug, Drug Resistance, Neoplasm, ErbB Receptors, Exons, Gene Expression Profiling, Humans, Lung Neoplasms, Models, Molecular, Mutation, Protein Binding, Protein Kinase Inhibitors, Structure-Activity Relationship
Show Abstract · Added March 21, 2020
PURPOSE - The third-generation EGFR inhibitor, osimertinib, is the first mutant-selective inhibitor that has received regulatory approval for the treatment of patients with -mutant lung cancer. Despite the development of highly selective third-generation inhibitors, acquired resistance remains a significant clinical challenge. Recently, we and others have identified a novel osimertinib resistance mutation, G724S, which was not predicted in screens. Here, we investigate how G724S confers resistance to osimertinib. We combine structure-based predictive modeling of G724S in combination with the 2 most common EGFR-activating mutations, exon 19 deletion (Ex19Del) and L858R, with drug-response models and patient genomic profiling.
RESULTS - Our simulations suggest that the G724S mutation selectively reduces osimertinib-binding affinity in the context of Ex19Del. Consistent with our simulations, cell lines transduced with Ex19Del/G724S demonstrate resistance to osimertinib, whereas cells transduced with L858R/G724S are sensitive to osimertinib. Subsequent clinical genomic profiling data further suggest G724S occurs with Ex19Del but not L858R. Furthermore, we demonstrate that Ex19Del/G724S retains sensitivity to afatinib, but not to erlotinib, suggesting a possible therapy for patients at the time of disease relapse.
CONCLUSIONS - Altogether, these data suggest that G724S is an allele-specific resistance mutation emerging in the context of Ex19Del but not L858R. Our results fundamentally reframe the problem of targeted therapy resistance from one focused on the "drug-resistance mutation" pair to one focused on the "activating mutation-drug-resistance mutation" trio. This has broad implications across clinical oncology.
©2019 American Association for Cancer Research.
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17 MeSH Terms
CYP2D6 genotype and adverse events to risperidone in children and adolescents.
Oshikoya KA, Neely KM, Carroll RJ, Aka IT, Maxwell-Horn AC, Roden DM, Van Driest SL
(2019) Pediatr Res 85: 602-606
MeSH Terms: Adolescent, Alleles, Child, Cytochrome P-450 CYP2D6, Electronic Health Records, Female, Genotype, Humans, Male, Pharmacogenetics, Phenotype, Polymorphism, Genetic, Retrospective Studies, Risk, Risperidone, Treatment Outcome
Show Abstract · Added March 24, 2020
BACKGROUND - There are few and conflicting data on the role of cytochrome P450 2D6 (CYP2D6) polymorphisms in relation to risperidone adverse events (AEs) in children. This study assessed the association between CYP2D6 metabolizer status and risk for risperidone AEs in children.
METHODS - Children ≤18 years with at least 4 weeks of risperidone exposure were identified using BioVU, a de-identified DNA biobank linked to electronic health record data. The primary outcome of this study was AEs. After DNA sequencing, individuals were classified as CYP2D6 poor, intermediate, normal, or ultrarapid CYP2D6 metabolizers.
RESULTS - For analysis, the 257 individuals were grouped as poor/intermediate metabolizers (n = 33, 13%) and normal/ultrarapid metabolizers (n = 224, 87%). AEs were more common in poor/intermediate vs. normal/ultrarapid metabolizers (15/33, 46% vs. 61/224, 27%, P = 0.04). In multivariate analysis adjusting for age, sex, race, and initial dose, poor/intermediate metabolizers had increased AE risk (adjusted odds ratio 2.4, 95% confidence interval 1.1-5.1, P = 0.03).
CONCLUSION - Children with CYP2D6 poor or intermediate metabolizer phenotypes are at greater risk for risperidone AEs. Pre-prescription genotyping could identify this high-risk subset for an alternate therapy, risperidone dose reduction, and/or increased monitoring for AEs.
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16 MeSH Terms
Sequence-based HLA-A, B, C, DP, DQ, and DR typing of 496 adults from San Diego, California, USA.
Moore E, Grifoni A, Weiskopf D, Schulten V, Arlehamn CSL, Angelo M, Pham J, Leary S, Sidney J, Broide D, Frazier A, Phillips E, Mallal S, Mack SJ, Sette A
(2018) Hum Immunol 79: 821-822
MeSH Terms: Adolescent, Adult, Alleles, California, Female, Gene Frequency, Genotype, Genotyping Techniques, HLA-A Antigens, HLA-B Antigens, HLA-C Antigens, HLA-DP Antigens, HLA-DQ Antigens, HLA-DR Antigens, Histocompatibility Testing, Humans, Linkage Disequilibrium, Male, Middle Aged, Sequence Analysis, DNA, T-Lymphocytes, Young Adult
Show Abstract · Added March 30, 2020
DNA sequence-based typing at the HLA-A, -B, -C, -DPB1, -DQA1, -DQB1, and -DRB1 loci was performed on 496 healthy adult donors from San Diego, California, to characterize allele frequencies in support of studies of T cell responses to common allergens. Deviations from Hardy Weinberg proportions were detected at each locus except A and C. Several alleles were found in more than 15% of individuals, including the class II alleles DPB1∗02:01, DPB1∗04:01, DQA1∗01:02, DQA1∗05:01, DQB1∗03:01, and the class I allele A∗02:01. Genotype data will be available in the Allele Frequencies Net Database (AFND 3562).
Copyright © 2018. Published by Elsevier Inc.
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MeSH Terms
Hemochromatosis (HFE) Gene Variants Are Associated with Increased Mitochondrial DNA Levels During HIV-1 Infection and Antiretroviral Therapy.
Kallianpur AR, Gerschenson M, Hulgan T, Kaur H, Clifford DB, Haas DW, Murdock DG, McArthur JC, Samuels DC, Simpson DM
(2018) AIDS Res Hum Retroviruses 34: 942-949
MeSH Terms: Adult, Alleles, Anti-HIV Agents, CD4 Lymphocyte Count, Case-Control Studies, DNA Copy Number Variations, DNA, Mitochondrial, Female, Genotype, HIV Infections, HIV-1, Hemochromatosis Protein, Humans, Leukocytes, Mononuclear, Male, Middle Aged, Mitochondria, RNA, Viral
Show Abstract · Added December 11, 2019
Some HIV-associated complications involve mitochondrial dysfunction and may be less common in individuals with iron-loading HFE (hemochromatosis gene) variants. We evaluated HFE 845A and 187G alleles in relation to mitochondrial DNA (mtDNA) levels in peripheral blood mononuclear cells from 85 individuals with HIV infection on uninterrupted antiretroviral therapy (ART) for 15 or more consecutive weeks. Carriers of HFE gene variants (N = 24) had significantly higher mtDNA levels than noncarriers (N = 61), after adjusting for age, race, sex, and type of ART [adjusted β-coefficient 297, p-value < .001 for at least one HFE variant], but mtDNA declined among all individuals on study during 48 weeks on ART. Increased cellular mtDNA content may represent a compensatory response to mitochondrial stress that is influenced by iron-loading HFE variants.
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Autochthonous tumors driven by loss have an ongoing requirement for the RBP2 histone demethylase.
McBrayer SK, Olenchock BA, DiNatale GJ, Shi DD, Khanal J, Jennings RB, Novak JS, Oser MG, Robbins AK, Modiste R, Bonal D, Moslehi J, Bronson RT, Neuberg D, Nguyen QD, Signoretti S, Losman JA, Kaelin WG
(2018) Proc Natl Acad Sci U S A 115: E3741-E3748
MeSH Terms: Alleles, Animals, DNA-Binding Proteins, Echocardiography, Enzyme Activation, Fibroblasts, Genes, Retinoblastoma, Heart Septal Defects, Histone Code, Integrases, Jumonji Domain-Containing Histone Demethylases, Mice, Mice, Inbred C57BL, Molecular Targeted Therapy, Neoplasm Proteins, Pituitary Neoplasms, Recombinant Fusion Proteins, Retinoblastoma Protein, Tamoxifen, Thyroid Neoplasms, Transgenes
Show Abstract · Added April 22, 2018
Inactivation of the retinoblastoma gene () product, pRB, is common in many human cancers. Targeting downstream effectors of pRB that are central to tumorigenesis is a promising strategy to block the growth of tumors harboring loss-of-function mutations. One such effector is retinoblastoma-binding protein 2 (RBP2, also called JARID1A or KDM5A), which encodes an H3K4 demethylase. Binding of pRB to RBP2 has been linked to the ability of pRB to promote senescence and differentiation. Importantly, genetic ablation of RBP2 is sufficient to phenocopy pRB's ability to induce these cellular changes in cell culture experiments. Moreover, germline deletion significantly impedes tumorigenesis in mice. The value of RBP2 as a therapeutic target in cancer, however, hinges on whether loss of RBP2 could block the growth of established tumors as opposed to simply delaying their onset. Here we show that conditional, systemic ablation of RBP2 in tumor-bearing mice is sufficient to slow tumor growth and significantly extend survival without causing obvious toxicity to the host. These findings show that established -null tumors require RBP2 for growth and further credential RBP2 as a therapeutic target in human cancers driven by inactivation.
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21 MeSH Terms
Drivers of genetic diversity in secondary metabolic gene clusters within a fungal species.
Lind AL, Wisecaver JH, Lameiras C, Wiemann P, Palmer JM, Keller NP, Rodrigues F, Goldman GH, Rokas A
(2017) PLoS Biol 15: e2003583
MeSH Terms: Alleles, Aspergillus fumigatus, Biological Evolution, Fungal Proteins, Fungi, Genetic Variation, Genome, Fungal, Genomics, Metabolic Networks and Pathways, Multigene Family, Mutation, Polymorphism, Genetic, Secondary Metabolism
Show Abstract · Added March 21, 2018
Filamentous fungi produce a diverse array of secondary metabolites (SMs) critical for defense, virulence, and communication. The metabolic pathways that produce SMs are found in contiguous gene clusters in fungal genomes, an atypical arrangement for metabolic pathways in other eukaryotes. Comparative studies of filamentous fungal species have shown that SM gene clusters are often either highly divergent or uniquely present in one or a handful of species, hampering efforts to determine the genetic basis and evolutionary drivers of SM gene cluster divergence. Here, we examined SM variation in 66 cosmopolitan strains of a single species, the opportunistic human pathogen Aspergillus fumigatus. Investigation of genome-wide within-species variation revealed 5 general types of variation in SM gene clusters: nonfunctional gene polymorphisms; gene gain and loss polymorphisms; whole cluster gain and loss polymorphisms; allelic polymorphisms, in which different alleles corresponded to distinct, nonhomologous clusters; and location polymorphisms, in which a cluster was found to differ in its genomic location across strains. These polymorphisms affect the function of representative A. fumigatus SM gene clusters, such as those involved in the production of gliotoxin, fumigaclavine, and helvolic acid as well as the function of clusters with undefined products. In addition to enabling the identification of polymorphisms, the detection of which requires extensive genome-wide synteny conservation (e.g., mobile gene clusters and nonhomologous cluster alleles), our approach also implicated multiple underlying genetic drivers, including point mutations, recombination, and genomic deletion and insertion events as well as horizontal gene transfer from distant fungi. Finally, most of the variants that we uncover within A. fumigatus have been previously hypothesized to contribute to SM gene cluster diversity across entire fungal classes and phyla. We suggest that the drivers of genetic diversity operating within a fungal species shown here are sufficient to explain SM cluster macroevolutionary patterns.
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13 MeSH Terms
Population Stratification in Genetic Association Studies.
Hellwege JN, Keaton JM, Giri A, Gao X, Velez Edwards DR, Edwards TL
(2017) Curr Protoc Hum Genet 95: 1.22.1-1.22.23
MeSH Terms: Alleles, Chromosome Mapping, Evolution, Molecular, Gene Frequency, Genetic Association Studies, Genetics, Population, Humans, Linkage Disequilibrium, Models, Genetic, Models, Statistical, Quantitative Trait, Heritable
Show Abstract · Added March 3, 2020
Population stratification (PS) is a primary consideration in studies of genetic determinants of human traits. Failure to control for PS may lead to confounding, causing a study to fail for lack of significant results, or resources to be wasted following false-positive signals. Here, historical and current approaches for addressing PS when performing genetic association studies in human populations are reviewed. Methods for detecting the presence of PS, including global and local ancestry methods, are described. Also described are approaches for accounting for PS when calculating association statistics, such that measures of association are not confounded. Many traits are being examined for the first time in minority populations, which may inherently feature PS. © 2017 by John Wiley & Sons, Inc.
Copyright © 2017 John Wiley and Sons, Inc.
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MeSH Terms
Helicobacter pylori Vacuolating Toxin and Gastric Cancer.
McClain MS, Beckett AC, Cover TL
(2017) Toxins (Basel) 9:
MeSH Terms: Alleles, Animals, Bacterial Proteins, Disease Models, Animal, Helicobacter pylori, Humans, Risk Factors, Stomach, Stomach Neoplasms, Virulence
Show Abstract · Added March 21, 2018
VacA is a channel-forming toxin unrelated to other known bacterial toxins. Most strains contain a gene, but there is marked variation among strains in VacA toxin activity. This variation is attributable to strain-specific variations in VacA amino acid sequences, as well as variations in the levels of VacA transcription and secretion. In this review, we discuss epidemiologic studies showing an association between specific allelic types and gastric cancer, as well as studies that have used animal models to investigate VacA activities relevant to gastric cancer. We also discuss the mechanisms by which VacA-induced cellular alterations may contribute to the pathogenesis of gastric cancer.
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10 MeSH Terms