Pharmacogenomics

Precision Obesity Treatments Including Pharmacogenetic and Nutrigenetic Approaches.

Wed, 2017-09-20 06:32
Related Articles

Precision Obesity Treatments Including Pharmacogenetic and Nutrigenetic Approaches.

Trends Pharmacol Sci. 2016 Jul;37(7):575-93

Authors: Solas M, Milagro FI, Martínez-Urbistondo D, Ramirez MJ, Martínez JA

Abstract
Five pharmaceutical strategies are currently approved by the US FDA for the treatment of obesity: orlistat, lorcaserin, liraglutide, phentermine/topiramate, and bupropion/naltrexone. The most effective treatment seems to be the combined administration of phentermine/topiramate followed by lorcaserin and bupropion/naltrexone. In relation to the management of excessive weight, other aspects also need to be considered, including comorbidities accompanying obesity, drug interactions, and the risk of negative collateral effects, as well as individualized treatments based on the genetic make-up. This review aims to provide an overview of the approved anti-obesity drugs and newer molecules that could affect different targets in the central nervous system or peripheral tissues, the molecular mechanisms, emerging dietary treatments and phytogenic compounds, and pharmacogenetic/nutrigenetic approaches for personalized obesity management.

PMID: 27236593 [PubMed - indexed for MEDLINE]

Categories: Literature Watch

pharmacogenomics; +12 new citations

Tue, 2017-09-19 09:03

12 new pubmed citations were retrieved for your search. Click on the search hyperlink below to display the complete search results:

pharmacogenomics

These pubmed results were generated on 2017/09/19

PubMed comprises more than millions of citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

Categories: Literature Watch

pharmacogenomics; +11 new citations

Tue, 2017-09-19 06:00

11 new pubmed citations were retrieved for your search. Click on the search hyperlink below to display the complete search results:

pharmacogenomics

These pubmed results were generated on 2017/09/19

PubMed comprises more than millions of citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

Categories: Literature Watch

Synthesis and in vitro study of benzofuran hydrazone derivatives as novel alpha-amylase inhibitor.

Mon, 2017-09-18 08:32
Related Articles

Synthesis and in vitro study of benzofuran hydrazone derivatives as novel alpha-amylase inhibitor.

Bioorg Chem. 2017 Sep 07;75:78-85

Authors: Taha M, Shah SAA, Imran S, Afifi M, Chigurupati S, Selvaraj M, Rahim F, Ullah H, Zaman K, Vijayabalan S

Abstract
The α-amylase acts as attractive target to treat type-2 diabetes mellitus. Therefore in discovering a small molecule as α-amylase inhibitor, we have synthesized benzofuran carbohydrazide analogs (1-25), characterized through different spectroscopic techniques such as (1)HNMR and EI-MS. All screened analog shows good α-amylase inhibitory potentials with IC50 value ranging between 1.078±0.19 and 2.926±0.05µM when compared with acarbose having IC50=0.62±0.22µM. Only nine analogs among the series such as analogs 3, 5, 7, 8, 10, 12, 21, 23 and 24 exhibit good inhibitory potential with IC50 values 1.644±0.128, 1.078±0.19, 1.245±0.25, 1.843±0.19, 1.350±0.24, 1.629±0.015, 1.353±0.232, 1.359±0.119 and 1.488±0.07µM when compare with standard drug acarbose. All other analogs showed good to moderate α-amylase inhibitory potentials. The SAR study was conducted on the basis of substituent difference at the phenyl ring. The binding interaction between analogs and active site of enzyme was confirmed by docking studies.

PMID: 28918064 [PubMed - as supplied by publisher]

Categories: Literature Watch

ABCB1 C3435T polymorphism is associated with tetrahydrocannabinol blood levels in heavy cannabis users.

Mon, 2017-09-18 08:32
Related Articles

ABCB1 C3435T polymorphism is associated with tetrahydrocannabinol blood levels in heavy cannabis users.

Psychiatry Res. 2017 Sep 09;:

Authors: Kebir O, Lafaye G, Blecha L, Chaumette B, Mouaffak F, Laqueille X, Benyamina A

Abstract
ABCB1 polymorphisms are known to modify drug pharmacokinetics but have yet to be studied for their role in generating and maintaining cannabis dependence. The objective of this study is to determine if ABCB1 C3435T (rs1045642) polymorphism may modulate Δ9-Tetrahydrocannabinol (THC) blood levels in a sample of heavy cannabis users. The study sample includes 39 Caucasian individuals, recruited in two French addictology centres, with isolated cannabis dependence and heavy use (defined as ≥ 7 joints per week). Each underwent clinical evaluation, cannabis blood metabolite dosage (THC, 11-OH-THC, and THC-COOH) and genotyping of ABCB1 C3435T polymorphism. In this population (males: 74.4%, average age 29.5 +/- 9), average cannabis use was 21 joints per week (median 12; range 7 - 80). T carriers (TT/CT) had significantly lower plasma THC levels (ng/ml) versus non T carriers (8 vs 15.70, significant), controlling for level of weekly use, 11-OH-THC and THC-COOH levels. Our results show that ABCB1 C3435T polymorphism may modulate serum THC levels in chronic heavy cannabis users. The exact mechanisms and roles that this may play in cannabis dependence genesis and evolution remain to be elucidated. These results should be controlled in a replication study using a larger population.

PMID: 28917442 [PubMed - as supplied by publisher]

Categories: Literature Watch

Genetic Test, Risk Prediction, and Counseling.

Sun, 2017-09-17 08:07
Related Articles

Genetic Test, Risk Prediction, and Counseling.

Adv Exp Med Biol. 2017;1005:21-46

Authors: Wang MH, Weng H

Abstract
Advancement in technology has nurtured the new era of genetic tests for personalized medicine. In this chapter, we will introduce the current development, challenges, and the outlook of genetic test, disease risk prediction, and genetic counseling. In the first section, we will present the success cases in the areas of molecular classification of tumors, pharmacogenomics, and Mendelian disorders, and the challenges of genetic tests implementations. In the second section, common methods for genetic risk prediction models and evaluation measures will be introduced, as well as challenges in feature reliability, risk model stability, and clinical utility. In the final section, key components of genetic counseling will be introduced, covering individual communications, psychosocial concerns, risk assessments, and follow-ups. Current evidences have shown a promising future for genetic testing and risk prediction; we expect that the advancement of analytical methods, technology, integration of omics data, and the increasing clinical implementation and regulation will continue to pave the way for precision medicine in future.

PMID: 28916927 [PubMed - in process]

Categories: Literature Watch

Effects of ICOS+ T cell depletion via afucosylated monoclonal antibody MEDI-570 on pregnant cynomolgus monkeys and the developing offspring.

Sun, 2017-09-17 08:07
Related Articles

Effects of ICOS+ T cell depletion via afucosylated monoclonal antibody MEDI-570 on pregnant cynomolgus monkeys and the developing offspring.

Reprod Toxicol. 2017 Sep 12;:

Authors: Nicholson SM, Carlesso G, Cheng LI, Cook H, DaCosta K, Leininger J, McKeever K, Scott SW, Taylor D, Streicher K, Eck S, Reed M, Faggioni R, Herbst R, Dixit R, Ryan PC

Abstract
MEDI-570 is a fully human afucosylated monoclonal antibody (MAb) against Inducible T-cell costimulator (ICOS), highly expressed on CD4+ T follicular helper (TFH) cells. Effects of MEDI-570 were evaluated in an enhanced pre-postnatal development toxicity (ePPND) study in cynomolgus monkeys. Administration to pregnant monkeys did cause any abortifacient effects. Changes in hematology and peripheral blood T lymphocyte subsets in maternal animals and infants and the attenuated infant IgG immune response to keyhole limpet hemocyanin (KLH) were attributed to MEDI-570 pharmacology. Adverse findings included aggressive fibromatosis in one dam and two infant losses in the high dose group with anatomic pathology findings suggestive of atypical lymphoid hyperplasia. The margin of safety relative to the no observed adverse effect level (NOAEL) for the highest planned clinical dose in the Phase 1a study was 7. This study suggests that women of child bearing potential employ effective methods of contraception while being treated with MEDI-570.

PMID: 28916434 [PubMed - as supplied by publisher]

Categories: Literature Watch

Mass spectrometry-based assay for the molecular diagnosis of glioma: concomitant detection of chromosome 1p/19q codeletion, and IDH1, IDH2, and TERT mutation status.

Sun, 2017-09-17 08:07
Related Articles

Mass spectrometry-based assay for the molecular diagnosis of glioma: concomitant detection of chromosome 1p/19q codeletion, and IDH1, IDH2, and TERT mutation status.

Oncotarget. 2017 Aug 22;8(34):57134-57148

Authors: Pesenti C, Paganini L, Fontana L, Veniani E, Runza L, Ferrero S, Bosari S, Menghi M, Marfia G, Caroli M, Silipigni R, Guerneri S, Tabano S, Miozzo M

Abstract
The World Health Organization recently revised the diagnosis of glioma, to integrate molecular parameters, including IDH mutations and codeletion (loss of heterozygosity; LOH) of chromosome arms 1p/19q, into the definitions of adult glioma histological subtypes. Mutations in the TERT promoter may also be useful for glioma diagnosis and prognosis. The integration of molecular markers into routine diagnosis requires their rapid and reliable assessment. We propose a MassARRAY (MS)-based test that can identify 1p/19q codeletion using quantitative SNP genotyping and, simultaneously, characterize hotspot mutations in the IDH1, IDH2, and TERT genes in tumor DNA. We determined the reliability of the MS approach testing 50 gliomas and comparing the MS results with those obtained by standard methods, such as short tandem repeat genotyping, array comparative genomic hybridization (array-CGH) and Fluorescence In Situ Hybridization (FISH) for 1p/19q codeletion and Sanger sequencing for hotspots mutations. The results indicate that MS is suitable for the accurate, rapid, and cost-effective evaluation of chromosome deletions combined with hotspot mutation detection. This MS approach could be similarly exploited in evaluation of LOH in other situations of clinical and/or research importance.

PMID: 28915660 [PubMed - in process]

Categories: Literature Watch

pharmacogenomics; +19 new citations

Sat, 2017-09-16 07:37

19 new pubmed citations were retrieved for your search. Click on the search hyperlink below to display the complete search results:

pharmacogenomics

These pubmed results were generated on 2017/09/16

PubMed comprises more than millions of citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.

Categories: Literature Watch

The Clinical Pharmacokinetics of Amphetamines Utilized in the Treatment of Attention-Deficit/Hyperactivity Disorder.

Fri, 2017-09-15 07:07

The Clinical Pharmacokinetics of Amphetamines Utilized in the Treatment of Attention-Deficit/Hyperactivity Disorder.

J Child Adolesc Psychopharmacol. 2017 Sep 14;

Authors: Markowitz JS, Patrick KS

Abstract
Amphetamine (AMP), an indirectly acting psychostimulant approved for the treatment of attention-deficit/hyperactivity disorder (ADHD) in children, adolescents, and adults, is among the most long-standing therapeutic agents in all of clinical psychopharmacology. This review focuses on AMP absorption, metabolism, and elimination brought to bear on comparative pharmacokinetics in its various formulations. A comprehensive search of the published literature was conducted using MEDLINE (PubMed) and Google Scholar databases through April 2017 to retrieve all pertinent in vitro and human studies for review and synthesis. Additionally, Food and Drug Administration (FDA) databases were accessed for otherwise unavailable data when possible. Initially available as racemic (dl)-AMP, this drug was later supplanted by enantiopure (d)-AMPH or enantioenriched (75:25 dl)-AMP formulations; although racemic AMP returned as an approved drug to treat ADHD in 2014. Presently, there are several immediate-release (IR) formulations available, including d-AMP, dl-AMP, and mixed amphetamine salts, which are neither racemic nor the pure d-enantiomer (i.e., a 3:1 mixture of d-AMP and l-AMP). Furthermore, new modified-release AMP formulations, including an oral suspension and an orally disintegrating tablet, are now available. A lysine-bonded prodrug form of d-AMP also serves as a treatment option. Oral AMP is rapidly absorbed, with high absolute bioavailability, followed by extensive metabolism involving multiple enzymes. Some metabolic pathways exhibit stereoselective biotransformations favoring the l-isomer substrate. Drug exposure exhibits dose-proportional pharmacokinetics. Body weight is a fundamental determinant of differences in observed AMP plasma concentrations. IR formulations typically provide a Tmax from 2 to 3 hours. In replicated studies, children exhibit a shorter plasma T1/2 (∼7 hours) relative to adults (∼10 to 12 hours). There are few documented pharmacokinetic drug interactions of clinical significance beyond influences of drug-induced alteration of urinary pH. The array of AMP formulations addressed in this review offer flexibility in dosing, drug onset, and offset to assist in individualized pharmacotherapy of ADHD.

PMID: 28910145 [PubMed - as supplied by publisher]

Categories: Literature Watch

MicroRNA pharmacogenomics based integrated model of miR-17-92 cluster in sorafenib resistant HCC cells reveals a strategy to forestall drug resistance.

Fri, 2017-09-15 07:07
Related Articles

MicroRNA pharmacogenomics based integrated model of miR-17-92 cluster in sorafenib resistant HCC cells reveals a strategy to forestall drug resistance.

Sci Rep. 2017 Sep 13;7(1):11448

Authors: Awan FM, Naz A, Obaid A, Ikram A, Ali A, Ahmad J, Naveed AK, Janjua HA

Abstract
Among solid tumors, hepatocellular carcinoma (HCC) emerges as a prototypical therapy-resistant tumor. Considering the emerging sorafenib resistance crisis in HCC, future studies are urgently required to overcome resistance. Recently noncoding RNAs (ncRNAs) have emerged as significant regulators in signalling pathways involved in cancer drug resistance and pharmacologically targeting these ncRNAs might be a novel stratagem to reverse drug resistance. In the current study, using a hybrid Petri net based computational model, we have investigated the harmonious effect of miR-17-92 cluster inhibitors/mimics and circular RNAs on sorafenib resistant HCC cells in order to explore potential resistance mechanisms and to identify putative targets for sorafenib-resistant HCC cells. An integrated model was developed that incorporates seven miRNAs belonging to miR-17-92 cluster (hsa-miR-17-5p, hsa-miR-17-3p, hsa-miR-19a, hsa-miR-19b, hsa-miR-18a, hsa-miR-20a and hsa-miR-92) and crosstalk of two signaling pathways (EGFR and IL-6) that are differentially regulated by these miRNAs. The mechanistic connection was proposed by the correlation between members belonging to miR-17-92 cluster and corresponding changes in the protein levels of their targets in HCC, specifically those targets that have verified importance in sorafenib resistance. Current findings uncovered potential pathway features, underlining the significance of developing modulators of this cluster to combat drug resistance in HCC.

PMID: 28904393 [PubMed - in process]

Categories: Literature Watch

Assessing the effects of mitofusin 2 deficiency in the adult heart using 3D electron tomography.

Fri, 2017-09-15 07:07
Related Articles

Assessing the effects of mitofusin 2 deficiency in the adult heart using 3D electron tomography.

Physiol Rep. 2017 Sep;5(17):

Authors: Beikoghli Kalkhoran S, Hall AR, White IJ, Cooper J, Fan Q, Ong SB, Hernández-Reséndiz S, Cabrera-Fuentes H, Chinda K, Chakraborty B, Dorn GW, Yellon DM, Hausenloy DJ

Abstract
The effects of mitofusin 2 (MFN2) deficiency, on mitochondrial morphology and the mitochondria-junctional sarcoplasmic reticulum (jSR) complex in the adult heart, have been previously investigated using 2D electron microscopy, an approach which is unable to provide a 3D spatial assessment of these imaging parameters. Here, we use 3D electron tomography to show that MFN2-deficient mitochondria are larger in volume, more elongated, and less rounded; have fewer mitochondria-jSR contacts, and an increase in the distance between mitochondria and jSR, when compared to WT mitochondria. In comparison to 2D electron microscopy, 3D electron tomography can provide further insights into mitochondrial morphology and the mitochondria-jSR complex in the adult heart.

PMID: 28904083 [PubMed - in process]

Categories: Literature Watch

MECHANISMS IN ENDOCRINOLOGY: CLINICAL AND PHARMACOGENETIC ASPECTS OF THE GROWTH HORMONE RECEPTOR POLYMORPHISM.

Fri, 2017-09-15 07:07
Related Articles

MECHANISMS IN ENDOCRINOLOGY: CLINICAL AND PHARMACOGENETIC ASPECTS OF THE GROWTH HORMONE RECEPTOR POLYMORPHISM.

Eur J Endocrinol. 2017 Sep 13;:

Authors: Boguszewski CL, Barbosa EJL, Svensson PA, Johannsson G, Glad CAM

Abstract
Pharmacogenetics aims to maximize the beneficial effects of a medical therapy by identifying genetic finger prints from responders and non-responders and, thereby, improving safety and efficacy profile of the drug. Most subjects who are deficient in growth hormone (GHD) are candidates for recombinant human GH (rhGH) therapy. To date, it is well established that even after adjustments for several clinical variables, such as age, gender, body composition and the age at onset of the GHD, response to rhGH treatment is highly variable among individuals, part of which is believed to be due to genetic factors within the GH system. As the first genetic variant to potentially influence the individual response to rhGH therapy in children with growth disorders, polymorphism in the GH receptor (GHR) has attracted a great interest as a target for pharmacogenetics. Studies have been conducted to compare the functional and molecular effects of the full-length GHR (fl-GHR) isoform with the exon 3 deleted (d3-GHR) isoform in children and adults treated with rhGH therapy. Additionally, the impact of the GHR polymorphism has been investigated in relation to the clinical status and response to medical treatment in acromegaly, especially to the GHR antagonist drug pegvisomant. We have performed a narrative review of the studies performed to date on the association of GHR polymorphism with rhGH response in children and adults, and its potential influence in the medical management of acromegaly. In addition, data from studies on the general population and in other chronic diseases examining a role of this genetic variant in the regulation of growth and metabolism are summarized.

PMID: 28904008 [PubMed - as supplied by publisher]

Categories: Literature Watch

Impact of human CA8 on thermal antinociception in relation to morphine equivalence in mice.

Thu, 2017-09-14 06:27

Impact of human CA8 on thermal antinociception in relation to morphine equivalence in mice.

Neuroreport. 2017 Sep 11;:

Authors: Fu ES, Erasso DM, Zhuang GZ, Upadhyay U, Ozdemir M, Wiltshire T, Sarantopoulos KD, Smith SB, Maixner W, Martin ER, Levitt RC

Abstract
Recently, we showed that murine dorsal root ganglion (DRG) Car8 expression is a cis-regulated eQTL that determines analgesic responses. In this report, we show that transduction through sciatic nerve injection of DRG with human wild-type carbonic anhydrase-8 using adeno-associated virus viral particles (AAV8-V5-CA8WT) produces analgesia in naive male C57BL/6J mice and antihyperalgesia after carrageenan treatment. A peak mean increase of about 4 s in thermal hindpaw withdrawal latency equaled increases in thermal withdrawal latency produced by 10 mg/kg intraperitoneal morphine in these mice. Allometric conversion of this intraperitoneal morphine dose in mice equals an oral morphine dose of about 146 mg in a 60-kg adult. Our work quantifies for the first time analgesia and antihyperalgesia in an inflammatory pain model after DRG transduction by CA8 gene therapy.This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal. http://creativecommons.org/licenses/by-nc-nd/4.0/.

PMID: 28902707 [PubMed - as supplied by publisher]

Categories: Literature Watch

Systematic Review of Cysteine-Sparing NOTCH3 Missense Mutations in Patients with Clinical Suspicion of CADASIL.

Thu, 2017-09-14 06:27

Systematic Review of Cysteine-Sparing NOTCH3 Missense Mutations in Patients with Clinical Suspicion of CADASIL.

Int J Mol Sci. 2017 Sep 13;18(9):

Authors: Muiño E, Gallego-Fabrega C, Cullell N, Carrera C, Torres N, Krupinski J, Roquer J, Montaner J, Fernández-Cadenas I

Abstract
CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy) is caused by mutations in the NOTCH3 gene, affecting the number of cysteines in the extracellular domain of the receptor, causing protein misfolding and receptor aggregation. The pathogenic role of cysteine-sparing NOTCH3 missense mutations in patients with typical clinical CADASIL syndrome is unknown. The aim of this article is to describe these mutations to clarify if any could be potentially pathogenic. Articles on cysteine-sparing NOTCH3 missense mutations in patients with clinical suspicion of CADASIL were reviewed. Mutations were considered potentially pathogenic if patients had: (a) typical clinical CADASIL syndrome; (b) diffuse white matter hyperintensities; (c) the 33 NOTCH3 exons analyzed; (d) mutations that were not polymorphisms; and (e) Granular osmiophilic material (GOM) deposits in the skin biopsy. Twenty-five different mutations were listed. Four fulfill the above criteria: p.R61W; p.R75P; p.D80G; and p.R213K. Patients carrying these mutations had typical clinical CADASIL syndrome and diffuse white matter hyperintensities, mostly without anterior temporal pole involvement. Cysteine-sparing NOTCH3 missense mutations are associated with typical clinical CADASIL syndrome and typical magnetic resonance imaging (MRI) findings, although with less involvement of the anterior temporal lobe. Hence, these mutations should be further studied to confirm their pathological role in CADASIL.

PMID: 28902129 [PubMed - in process]

Categories: Literature Watch

microRNAs to monitor pain-migraine and drug treatment.

Thu, 2017-09-14 06:27

microRNAs to monitor pain-migraine and drug treatment.

Microrna. 2017 Sep 12;:

Authors: Siniscalchi A, Gallelli L, Cione E, Caroleo MC, Carotenuto M, Lagana P, Guidetti V

Abstract
Migraine is a prevalent neurovascular disorders with a complex pathophysiology and therapeutic options characterized by important side effects or problems related to drug abuse. No specific biomarkers are recognized to be univocal for this subclinical condition, yet. In this concern microRNAs have been suggested as potentially useful screening/diagnostic tool, and research is underway to recognize the most effective candidate(s). microRNAs, able to regulate immune and neuronal processes are herein reported for both, mice models with multiple induced pain conditions and human subjects. During human migraine attack specific miRs were found dysregulated, as well as in mouse models with different pain conditions. Amongst all the miRs screened in mice/human suffering of pain the microRNA-590-5p was found alterated. This latter miR, in mice human is modulated by celecoxib, while in human is dysregulated in the complex regional pain syndrome, condition where migraine assume a risk factor for its development. Recently has been reported that pharmacological treatments, indirectly can pertubate microRNA expression results. Therefore, microRNA-590-5p could assume an interesting double meaning for a clinical point of view. It can be considered biomarker of general pain, including migraine and also biomarker to evaluate the efficacy of the drug treatment. This could be of great importance in infant-juvenile segment, where the diagnosis of migraine is very challenging. In this view, since therapy is often started with NSAIDs herein we discuss also how the discovery of the new role of microRNAs in determining drug efficacy open a new scenario in the pain-migraine tailored therapy and pharmacogenomics concept.

PMID: 28901847 [PubMed - as supplied by publisher]

Categories: Literature Watch

The Daniel K. Inouye College of Pharmacy Scripts: Precision Medicine Through the Use of Pharmacogenomics: Current Status and Barriers to Implementation.

Thu, 2017-09-14 06:27
Related Articles

The Daniel K. Inouye College of Pharmacy Scripts: Precision Medicine Through the Use of Pharmacogenomics: Current Status and Barriers to Implementation.

Hawaii J Med Public Health. 2017 Sep;76(9):265-269

Authors: Ciarleglio AE, Ma C

Abstract
The precision medicine initiative brought forth by President Barack Obama in 2015 is an important step on the journey to truly personalized medicine. A broad knowledge and understanding of the implications of the pharmacogenomic literature will be critical to the achievement of this goal. While a great amount of data has been published in the areas of pharmacogenomics and pharmacogenetics, there are still relatively few instances in which the need for clinical intervention can be stated without doubt, and which are widely accepted and practiced by the medical community. As our knowledge base rapidly expands, issues such as insurance reimbursement for genetic testing and education of the health care workforce will be paramount to achieving the goal of precision medicine for all patients.

PMID: 28900583 [PubMed - in process]

Categories: Literature Watch

Heterogeneity Aware Random Forest for Drug Sensitivity Prediction.

Thu, 2017-09-14 06:27
Related Articles

Heterogeneity Aware Random Forest for Drug Sensitivity Prediction.

Sci Rep. 2017 Sep 12;7(1):11347

Authors: Rahman R, Matlock K, Ghosh S, Pal R

Abstract
Samples collected in pharmacogenomics databases typically belong to various cancer types. For designing a drug sensitivity predictive model from such a database, a natural question arises whether a model trained on diverse inter-tumor heterogeneous samples will perform similar to a predictive model that takes into consideration the heterogeneity of the samples in model training and prediction. We explore this hypothesis and observe that ensemble model predictions obtained when cancer type is known out-perform predictions when that information is withheld even when the samples sizes for the former is considerably lower than the combined sample size. To incorporate the heterogeneity idea in the commonly used ensemble based predictive model of Random Forests, we propose Heterogeneity Aware Random Forests (HARF) that assigns weights to the trees based on the category of the sample. We treat heterogeneity as a latent class allocation problem and present a covariate free class allocation approach based on the distribution of leaf nodes of the model ensemble. Applications on CCLE and GDSC databases show that HARF outperforms traditional Random Forest when the average drug responses of cancer types are different.

PMID: 28900181 [PubMed - in process]

Categories: Literature Watch

[Research advances in pharmacogenomics of mercaptopurine].

Thu, 2017-09-14 06:27
Related Articles

[Research advances in pharmacogenomics of mercaptopurine].

Zhongguo Dang Dai Er Ke Za Zhi. 2017 Sep;19(9):1027-1033

Authors: Chen XX, Shen SH

Abstract
Mercaptopurine is a common chemotherapeutic drug and immunosuppressive agent and plays an important role in the treatment of acute lymphoblastic leukemia and inflammatory bowel disease. It may cause severe adverse effects such as myelosuppression, which may result in the interruption of treatment or complications including infection or even threaten patients' lives. However, the adverse effects of mercaptopurine show significant racial and individual differences, which reveal the important role of genetic diversity. Recent research advances in pharmacogenomics have gradually revealed the genetic nature of such differences. This article reviews the recent research advances in the pharmacogenomics and individualized application of mercaptopurine.

PMID: 28899477 [PubMed - in process]

Categories: Literature Watch

ABCB1 polymorphism is associated with atorvastatin-induced liver injury in Japanese population.

Thu, 2017-09-14 06:27
Related Articles

ABCB1 polymorphism is associated with atorvastatin-induced liver injury in Japanese population.

BMC Genet. 2016 Jun 13;17(1):79

Authors: Fukunaga K, Nakagawa H, Ishikawa T, Kubo M, Mushiroda T

Abstract
BACKGROUND: To investigate the associations between atorvastatin-induced liver injury (AILI) and polymorphisms in eight genes possibly involved in the hepatic metabolism (CYP2C9, CYP2C19, CYP3A4, CYP3A5 and UGT1A1) and membrane transport (ABCB1, ABCG2 and SLCO1B1) of atorvastatin, we genotyped 30 AILI and 414 non-AILI patients recruited at BioBank Japan for 15 single nucleotide polymorphisms (SNPs).
RESULTS: An SNP in ABCB1 (rs2032582: 2677G > T/A) was significantly associated with AILI (P = 0.00068, odds ratio (OR) = 2.59 with 95 % confidence interval (CI) of 1.49-4.50, G allele versus T and A alleles), indicating that the G allele might be a risk factor for AILI. The cytotoxicity test demonstrated that IC50 value of atorvastatin to inhibit the growth and/or viability of Flp-In-293/ABCB1 (2677G) cells was 5.44 ± 0.10 mM, which was significantly lower than those in Flp-In-293/ABCB1 (2677 T) (6.02 ± 0.07 mM) and Flp-In-293/ABCB1 (2677A) cells (5.95 ± 0.08 mM).
CONCLUSIONS: These results indicate that ABCB1 rs2032582 may predict the risk of AILI in Japanese population.

PMID: 27296832 [PubMed - indexed for MEDLINE]

Categories: Literature Watch

Pages