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Sunday, September 22, 2019

Global identification of the full-length transcripts and alternative splicing related to phenolic acid biosynthetic genes in Salvia miltiorrhiza.

Salvianolic acids are among the main bioactive components in Salvia miltiorrhiza, and their biosynthesis has attracted widespread interest. However, previous studies on the biosynthesis of phenolic acids using next-generation sequencing platforms are limited with regard to the assembly of full-length transcripts. Based on hybrid-seq (next-generation and single molecular real-time sequencing) of the S. miltiorrhiza root transcriptome, we experimentally identified 15 full-length transcripts and four alternative splicing events of enzyme-coding genes involved in the biosynthesis of rosmarinic acid. Moreover, we herein demonstrate that lithospermic acid B accumulates in the phloem and xylem of roots, in agreement with the expression patterns of…

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Sunday, September 22, 2019

Biosynthesis of antibiotic chuangxinmycin from Actinoplanes tsinanensis.

Chuangxinmycin is an antibiotic isolated from Actinoplanes tsinanensis CPCC 200056 in the 1970s with a novel indole-dihydrothiopyran heterocyclic skeleton. Chuangxinmycin showed in vitro antibacterial activity and in vivo efficacy in mouse infection models as well as preliminary clinical trials. But the biosynthetic pathway of chuangxinmycin has been obscure since its discovery. Herein, we report the identification of a stretch of DNA from the genome of A. tsinanensis CPCC 200056 that encodes genes for biosynthesis of chuangxinmycin by bioinformatics analysis. The designated cxn cluster was then confirmed to be responsible for chuangxinmycin biosynthesis by direct cloning and heterologous expressing in Streptomyces…

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Friday, July 19, 2019

Long-read Single-Molecule Real-Time (SMRT) full gene sequencing of cytochrome P450-2D6 (CYP2D6).

The CYP2D6 enzyme metabolizes ~25% of common medications, yet homologous pseudogenes and copy-number variants (CNVs) make interrogating the polymorphic CYP2D6 gene with short-read sequencing challenging. Therefore, we developed a novel long-read, full gene CYP2D6 single-molecule real-time (SMRT) sequencing method using the Pacific Biosciences platform. Long-range PCR and CYP2D6 SMRT sequencing of 10 previously genotyped controls identified expected star (*) alleles, but also enabled suballele resolution, diplotype refinement, and discovery of novel alleles. Coupled with an optimized variant calling pipeline, CYP2D6 SMRT sequencing was highly reproducible as triplicate intra- and inter-run non-reference genotype results were completely concordant. Importantly, targeted SMRT sequencing…

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Sunday, July 7, 2019

Draft genome assembly and annotation of Glycyrrhiza uralensis, a medicinal legume.

Chinese liquorice/licorice (Glycyrrhiza uralensis) is a leguminous plant species whose roots and rhizomes have been widely used as a herbal medicine and natural sweetener. Whole-genome sequencing is essential for gene discovery studies and molecular breeding in liquorice. Here, we report a draft assembly of the approximately 379-Mb whole-genome sequence of strain 308-19 of G. uralensis; this assembly contains 34 445 predicted protein-coding genes. Comparative analyses suggested well-conserved genomic components and collinearity of gene loci (synteny) between the genome of liquorice and those of other legumes such as Medicago and chickpea. We observed that three genes involved in isoflavonoid biosynthesis, namely, 2-hydroxyisoflavanone…

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Sunday, July 7, 2019

Long-read sequencing offers path to more accurate drug metabolism profiles

In the complex drug discovery process, one of the looming questions for any new compound is how it will be metabolised in a human bodyWhi|e there are several methods for evaluating this, one of the most common involves CYP2D6,the enzyme encoded by the cytochrome P450—2D6 gene.This enzyme is involved in metabolising a quarter of all commonly used medications, making it an important target for ADME and pharmacogenomics studies. It is known to activate some drugs and to play a role in the deactivation or excretion of others.

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Sunday, July 7, 2019

Precision medicine and rare genetic variants.

Interindividual variability in drug metabolism and drug toxicity persists as a major problem for drug development and treatment. Increased or decreased capacity for drug elimination or drug action reduces drug efficacy and places substantial economic burdens on society (e.g., due to treatment of adverse drug reactions) [1]. To a great extent this variation is based on genetic differences, and indeed many drugs now carry pharmacogenomic labels regarding mandatory or informative genetic tests that have to/can be performed before prescription (http://www.fda.gov/drugs/ scienceresearch/researchareas/pharmacogenetics/ucm083378.htm).Theselabelsarebasedonthe most common allelic variants in germline or somatic genes with importance for drug metabolism that encode phase I or…

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Sunday, July 7, 2019

The Cer-cqu gene cluster determines three key players in a ß-diketone synthase polyketide pathway synthesizing aliphatics in epicuticular waxes.

Aliphatic compounds on plant surfaces, called epicuticular waxes, are the first line of defense against pathogens and pests, contribute to reducing water loss and determine other important phenotypes. Aliphatics can form crystals affecting light refraction, resulting in a color change and allowing identification of mutants in their synthesis or transport. The present study discloses three such Eceriferum (cer) genes in barley – Cer-c, Cer-q and Cer-u – known to be tightly linked and functioning in a biochemical pathway forming dominating amounts of ß-diketone and hydroxy-ß-diketones plus some esterified alkan-2-ols. These aliphatics are present in many Triticeae as well as dicotyledons…

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Sunday, July 7, 2019

Implementation of pharmacogenomics in everyday clinical settings.

Currently, germline pharmacogenomics (PGx) is successfully implemented within certain specialties in clinical care. With the integration of PGx in pharmacotherapy multiple stakeholders are involved, which are identified in this chapter. Clinically relevant pharmacogenes with their related PGx test are discussed, along with diagnostic test criteria to guide clinicians and policy makers in PGx test selection. The chapter further reviews the similarities and the differences between the guidelines of the Dutch Pharmacogenetics Working Group and the Clinical Pharmacogenetics Implementation Consortium which both support healthcare professionals in understanding PGx test results and help guiding pharmacotherapy by providing evidence-based dosing recommendations. Finally, clinical…

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