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Evolutionary medicine

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https://www.readbyqxmd.com/read/28279524/two-residues-determine-the-product-profile-of-the-class-ii-diterpene-synthases-tps14-and-tps21-of-tripterygium-wilfordii
#1
Nikolaj L Hansen, Jakob N Nissen, Björn Hamberger
The medicinal plant Tripterygium wilfordii (Celastraceae) contains a pair of class II diterpene synthases (diTPS) of specialized labdane-type metabolism that, despite remarkably close homology, form strikingly different products. TwTPS21 catalyzes bicyclization of the linear C20 precursor geranylgeranyl diphosphate to ent-copal-8-ol diphosphate, while TwTPS14 forms kolavenyl diphosphate. To determine the amino acid signature controlling the functional divergence of the homologues, we modeled their structures based on an existing crystal structure of the Arabidopsis ent-copalyl diphosphate synthase, archetypal of diTPSs in general metabolism of gibberellin phytohormones...
March 6, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28274726/a-population-genetics-perspective-on-the-determinants-of-intra-tumor-heterogeneity
#2
Zheng Hu, Ruping Sun, Christina Curtis
Cancer results from the acquisition of somatic alterations in a microevolutionary process that typically occurs over many years, much of which is occult. Understanding the evolutionary dynamics that are operative at different stages of progression in individual tumors might inform the earlier detection, diagnosis, and treatment of cancer. Although these processes cannot be directly observed, the resultant spatiotemporal patterns of genetic variation amongst tumor cells encode their evolutionary histories. Such intra-tumor heterogeneity is pervasive not only at the genomic level, but also at the transcriptomic, phenotypic, and cellular levels...
March 5, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28265493/transcriptome-analysis-of-polygonum-minus-reveals-candidate-genes-involved-in-important-secondary-metabolic-pathways-of-phenylpropanoids-and-flavonoids
#3
Kok-Keong Loke, Reyhaneh Rahnamaie-Tajadod, Chean-Chean Yeoh, Hoe-Han Goh, Zeti-Azura Mohamed-Hussein, Zamri Zainal, Ismanizan Ismail, Normah Mohd Noor
BACKGROUND: Polygonum minus is an herbal plant in the Polygonaceae family which is rich in ethnomedicinal plants. The chemical composition and characteristic pungent fragrance of Polygonum minus have been extensively studied due to its culinary and medicinal properties. There are only a few transcriptome sequences available for species from this important family of medicinal plants. The limited genetic information from the public expressed sequences tag (EST) library hinders further study on molecular mechanisms underlying secondary metabolite production...
2017: PeerJ
https://www.readbyqxmd.com/read/28263318/spatiotemporal-genomic-architecture-informs-precision-oncology-in-glioblastoma
#4
Jin-Ku Lee, Jiguang Wang, Jason K Sa, Erik Ladewig, Hae-Ock Lee, In-Hee Lee, Hyun Ju Kang, Daniel S Rosenbloom, Pablo G Camara, Zhaoqi Liu, Patrick van Nieuwenhuizen, Sang Won Jung, Seung Won Choi, Junhyung Kim, Andrew Chen, Kyu-Tae Kim, Sang Shin, Yun Jee Seo, Jin-Mi Oh, Yong Jae Shin, Chul-Kee Park, Doo-Sik Kong, Ho Jun Seol, Andrew Blumberg, Jung-Il Lee, Antonio Iavarone, Woong-Yang Park, Raul Rabadan, Do-Hyun Nam
Precision medicine in cancer proposes that genomic characterization of tumors can inform personalized targeted therapies. However, this proposition is complicated by spatial and temporal heterogeneity. Here we study genomic and expression profiles across 127 multisector or longitudinal specimens from 52 individuals with glioblastoma (GBM). Using bulk and single-cell data, we find that samples from the same tumor mass share genomic and expression signatures, whereas geographically separated, multifocal tumors and/or long-term recurrent tumors are seeded from different clones...
March 6, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28253926/exo-erythrocytic-development-of-avian-malaria-and-related-haemosporidian-parasites
#5
REVIEW
Gediminas Valkiūnas, Tatjana A Iezhova
BACKGROUND: Avian malaria parasites (Plasmodium spp.) and related haemosporidians (Haemosporida) are responsible for diseases which can be severe and even lethal in avian hosts. These parasites cause not only blood pathology, but also damage various organs due to extensive exo-erythrocytic development all over the body, which is not the case during Plasmodium infections in mammals. However, exo-erythrocytic development (tissue merogony or schizogony) remains the most poorly investigated part of life cycle in all groups of wildlife haemosporidian parasites...
March 3, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28202622/the-hypertension-pandemic-an-evolutionary-perspective
#6
REVIEW
Bernard C Rossier, Murielle Bochud, Olivier Devuyst
Hypertension affects over 1.2 billion individuals worldwide and has become the most critical and expensive public health problem. Hypertension is a multifactorial disease involving environmental and genetic factors together with risk-conferring behaviors. The cause of the disease is identified in ∼10% of the cases (secondary hypertension), but in 90% of the cases no etiology is found (primary or essential hypertension). For this reason, a better understanding of the mechanisms controlling blood pressure in normal and hypertensive patients is the aim of very active experimental and clinical research...
March 2017: Physiology
https://www.readbyqxmd.com/read/28190772/sex-differences-a-resultant-of-an-evolutionary-pressure
#7
Sara Della Torre, Adriana Maggi
Spurred by current research policy, we are witnessing a significant growth in the number of studies that observe and describe sexual diversities in human physiology and sex prevalence in a large number of pathologies. Yet we are far from the comprehension of the mechanisms underpinning these differences, which are the result of a long evolutionary history. This Essay is meant to underline female reproductive function as a driver for the positive selection of the specific physiological features that explain male and female differential susceptibility to diseases and metabolic disturbances, in particular...
March 7, 2017: Cell Metabolism
https://www.readbyqxmd.com/read/28187284/clonal-heterogeneity-and-tumor-evolution-past-present-and-the-future
#8
REVIEW
Nicholas McGranahan, Charles Swanton
Intratumor heterogeneity, which fosters tumor evolution, is a key challenge in cancer medicine. Here, we review data and technologies that have revealed intra-tumor heterogeneity across cancer types and the dynamics, constraints, and contingencies inherent to tumor evolution. We emphasize the importance of macro-evolutionary leaps, often involving large-scale chromosomal alterations, in driving tumor evolution and metastasis and consider the role of the tumor microenvironment in engendering heterogeneity and drug resistance...
February 9, 2017: Cell
https://www.readbyqxmd.com/read/28182485/-wolves-canis-lupus-and-dogs-canis-familiaris-differ-in-following-human-gaze-into-distant-space-but-respond-similar-to-their-packmates-gaze-correction-to-werhahn-et-al-2016
#9
(no author information available yet)
Reports an error in "Wolves (Canis lupus) and dogs (Canis familiaris) differ in following human gaze into distant space but respond similar to their packmates' gaze" by Geraldine Werhahn, Zsófia Virányi, Gabriela Barrera, Andrea Sommese and Friederike Range (Journal of Comparative Psychology, 2016[Aug], Vol 130[3], 288-298). In the article, the affiliations for the second and fifth authors should be Wolf Science Center, Ernstbrunn, Austria, and Comparative Cognition, Messerli Research Institute, University of Veterinary Medicine Vienna/ Medical University of Vienna/University of Vienna...
February 2017: Journal of Comparative Psychology
https://www.readbyqxmd.com/read/28179113/traditional-mediterranean-and-european-herbal-medicines
#10
Marco Leonti, Robert Verpoorte
ETHNOPHARMACOLOGICAL RELEVANCE: Written history allows tracing back Mediterranean and European medical traditions to Greek antiquity. The epidemiological shift triggered by the rise of modern medicine and industrialization is reflected in contemporary reliance and preferences for certain herbal medicines. MATERIALS AND METHODS: We sketch the development and transmission of written herbal medicine through Mediterranean and European history and point out the opportunity to connect with modern traditions...
February 4, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28175954/multiple-resistance-to-carcinogens-and-xenobiotics-p-glycoproteins-as-universal-detoxifiers
#11
REVIEW
Thomas Efferth, Manfred Volm
The detoxification of toxic substances is of general relevance in all biological systems. The plethora of exogenous xenobiotic compounds and endogenous toxic metabolic products explains the evolutionary pressure of all organisms to develop molecular mechanisms to detoxify and excrete harmful substances from the body. P-glycoprotein and other members of the ATP-binding cassette (ABC) transporter family extrude innumerous chemical compounds out of cells. Their specific expression in diverse biological contexts cause different phenotypes: (1) multidrug resistance (MDR) and thus failure of cancer chemotherapy, (2) avoidance of accumulation of carcinogens and prevention of carcinogenesis in healthy tissues, (3) absorption, distribution, metabolization and excretion (ADME) of pharmacological drugs in human patients, (4) protection from environmental toxins in aquatic organisms (multi-xenobiotic resistance, MXR)...
February 7, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28165479/whole-genome-single-cell-copy-number-profiling-from-formalin-fixed-paraffin-embedded-samples
#12
Luciano G Martelotto, Timour Baslan, Jude Kendall, Felipe C Geyer, Kathleen A Burke, Lee Spraggon, Salvatore Piscuoglio, Kalyani Chadalavada, Gouri Nanjangud, Charlotte K Y Ng, Pamela Moody, Sean D'Italia, Linda Rodgers, Hilary Cox, Arnaud da Cruz Paula, Asya Stepansky, Michail Schizas, Hannah Y Wen, Tari A King, Larry Norton, Britta Weigelt, James B Hicks, Jorge S Reis-Filho
A substantial proportion of tumors consist of genotypically distinct subpopulations of cancer cells. This intratumor genetic heterogeneity poses a substantial challenge for the implementation of precision medicine. Single-cell genomics constitutes a powerful approach to resolve complex mixtures of cancer cells by tracing cell lineages and discovering cryptic genetic variations that would otherwise be obscured in tumor bulk analyses. Because of the chemical alterations that result from formalin fixation, single-cell genomic approaches have largely remained limited to fresh or rapidly frozen specimens...
March 2017: Nature Medicine
https://www.readbyqxmd.com/read/28161621/evolution-of-cancer-suppression-as-revealed-by-mammalian-comparative-genomics
#13
REVIEW
Marc Tollis, Joshua D Schiffman, Amy M Boddy
Cancer suppression is an important feature in the evolution of large and long-lived animals. While some tumor suppression pathways are conserved among all multicellular organisms, others mechanisms of cancer resistance are uniquely lineage specific. Comparative genomics has become a powerful tool to discover these unique and shared molecular adaptations in respect to cancer suppression. These findings may one day be translated to human patients through evolutionary medicine. Here, we will review theory and methods of comparative cancer genomics and highlight major findings of cancer suppression across mammals...
February 2, 2017: Current Opinion in Genetics & Development
https://www.readbyqxmd.com/read/28155809/from-evolutionary-advantage-to-disease-agents-forensic-reevaluation-of-host-microbe-interactions-and-pathogenicity
#14
Jessica I Rivera-Pérez, Alfredo A González, Gary A Toranzos
As the "human microbiome era" continues, there is an increasing awareness of our resident microbiota and its indispensable role in our fitness as holobionts. However, the host-microbe relationship is not so clearly defined for some human symbionts. Here we discuss examples of "accidental pathogens," meaning previously nonpathogenic and/or environmental microbes thought to have inadvertently experienced an evolutionary shift toward pathogenicity. For instance, symbionts such as Helicobacter pylori and JC polyomavirus have been shown to have accompanied humans since prehistoric times and are still abundant in extant populations as part of the microbiome...
January 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28154920/high-grade-serous-ovarian-cancer-the-clone-wars
#15
REVIEW
Aleksander Salomon-Perzyński, Magdalena Salomon-Perzyńska, Bogdan Michalski, Violetta Skrzypulec-Plinta
BACKGROUND: The last 5 years' studies using next-generation sequencing provided evidences that many types of solid tumors present spatial and temporal genetic heterogeneity and are composed of multiple populations of genetically distinct subclones that evolve over time following a pattern of branched evolution. The evolutionary nature of cancer has been proposed as the major contributor to drug resistance and treatment failure. In this review, we present the current state of knowledge about the clonal evolution of high-grade serous ovarian cancer and discuss the challenge that clonal evolution poses for efforts to achieve an optimal cancer control...
March 2017: Archives of Gynecology and Obstetrics
https://www.readbyqxmd.com/read/28125109/fluorescent-natural-products-as-probes-and-tracers-in-biology
#16
REVIEW
Romain Duval, Christophe Duplais
Covering: 1985 up to the end of 2016Fluorescence is a remarkable property of many natural products in addition to their medicinal and biological values. Herein, we provide a review on these peculiar secondary metabolites to stimulate prospecting of them as original fluorescent tracers, endowed with unique photophysical properties and with applications in most fields of biology. The compounds are spectrally categorized (i.e. fluorescing from violet to the near infra-red) and further structurally classified within each category...
January 26, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28110272/mitonuclear-interactions-mediate-transcriptional-responses-to-hypoxia-in-drosophila
#17
Jim A Mossman, Jennifer G Tross, Nick A Jourjine, Nan Li, Zhijin Wu, David M Rand
Among the major challenges in quantitative genetics and personalized medicine is to understand how gene × gene interactions (G × G: epistasis) and gene × environment interactions (G × E) underlie phenotypic variation. Here, we use the intimate relationship between mitochondria and oxygen availability to dissect the roles of nuclear DNA (nDNA) variation, mitochondrial DNA (mtDNA) variation, hypoxia, and their interactions on gene expression in Drosophila melanogaster Mitochondria provide an important evolutionary and medical context for understanding G × G and G × E given their central role in integrating cellular signals...
November 14, 2016: Molecular Biology and Evolution
https://www.readbyqxmd.com/read/28104906/interrogating-open-issues-in-cancer-precision-medicine-with-patient-derived-xenografts
#18
REVIEW
Annette T Byrne, Denis G Alférez, Frédéric Amant, Daniela Annibali, Joaquín Arribas, Andrew V Biankin, Alejandra Bruna, Eva Budinská, Carlos Caldas, David K Chang, Robert B Clarke, Hans Clevers, George Coukos, Virginie Dangles-Marie, S Gail Eckhardt, Eva Gonzalez-Suarez, Els Hermans, Manuel Hidalgo, Monika A Jarzabek, Steven de Jong, Jos Jonkers, Kristel Kemper, Luisa Lanfrancone, Gunhild Mari Mælandsmo, Elisabetta Marangoni, Jean-Christophe Marine, Enzo Medico, Jens Henrik Norum, Héctor G Palmer, Daniel S Peeper, Pier Giuseppe Pelicci, Alejandro Piris-Gimenez, Sergio Roman-Roman, Oscar M Rueda, Joan Seoane, Violeta Serra, Laura Soucek, Dominique Vanhecke, Alberto Villanueva, Emilie Vinolo, Andrea Bertotti, Livio Trusolino
Patient-derived xenografts (PDXs) have emerged as an important platform to elucidate new treatments and biomarkers in oncology. PDX models are used to address clinically relevant questions, including the contribution of tumour heterogeneity to therapeutic responsiveness, the patterns of cancer evolutionary dynamics during tumour progression and under drug pressure, and the mechanisms of resistance to treatment. The ability of PDX models to predict clinical outcomes is being improved through mouse humanization strategies and the implementation of co-clinical trials, within which patients and PDXs reciprocally inform therapeutic decisions...
April 2017: Nature Reviews. Cancer
https://www.readbyqxmd.com/read/28104380/-evolutionary-medicine-a-new-look-on-health-and-disease
#19
F Bauduer
Evolutionary medicine represents an innovative approach deriving from evolutionary biology. It includes the initial Darwin's view, its actualization in the light of progresses in genetics and also dissident theories (i.e. non gene-based) particularly epigenetics. This approach enables us to reconsider the pathophysiology of numerous diseases, as for instance, infection, and our so-called diseases of civilization especially obesity, type 2 diabetes, allergy or cancer. Evolutionary medicine may also improve our knowledge regarding inter-individual variation in susceptibility to disease or drugs...
January 16, 2017: La Revue de Médecine Interne
https://www.readbyqxmd.com/read/28096488/novel-superspreader-bacteriophages-promote-horizontal-gene-transfer-by-transformation
#20
Eric C Keen, Valery V Bliskovsky, Francisco Malagon, James D Baker, Jeffrey S Prince, James S Klaus, Sankar L Adhya
Bacteriophages infect an estimated 10(23) to 10(25) bacterial cells each second, many of which carry physiologically relevant plasmids (e.g., those encoding antibiotic resistance). However, even though phage-plasmid interactions occur on a massive scale and have potentially significant evolutionary, ecological, and biomedical implications, plasmid fate upon phage infection and lysis has not been investigated to date. Here we show that a subset of the natural lytic phage population, which we dub "superspreaders," releases substantial amounts of intact, transformable plasmid DNA upon lysis, thereby promoting horizontal gene transfer by transformation...
January 17, 2017: MBio
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