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Tuesday, April 21, 2020

The Chinese chestnut genome: a reference for species restoration

Forest tree species are increasingly subject to severe mortalities from exotic pests, diseases, and invasive organisms, accelerated by climate change. Forest health issues are threatening multiple species and ecosystem sustainability globally. While sources of resistance may be available in related species, or among surviving trees, introgression of resistance genes into threatened tree species in reasonable time frames requires genome-wide breeding tools. Asian species of chestnut (Castanea spp.) are being employed as donors of disease resistance genes to restore native chestnut species in North America and Europe. To aid in the restoration of threatened chestnut species, we present the assembly of…

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Tuesday, April 21, 2020

Genomic variation and strain-specific functional adaptation in the human gut microbiome during early life.

The human gut microbiome matures towards the adult composition during the first years of life and is implicated in early immune development. Here, we investigate the effects of microbial genomic diversity on gut microbiome development using integrated early childhood data sets collected in the DIABIMMUNE study in Finland, Estonia and Russian Karelia. We show that gut microbial diversity is associated with household location and linear growth of children. Single nucleotide polymorphism- and metagenomic assembly-based strain tracking revealed large and highly dynamic microbial pangenomes, especially in the genus Bacteroides, in which we identified evidence of variability deriving from Bacteroides-targeting bacteriophages. Our…

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Tuesday, April 21, 2020

Penicillium purpurogenum Produces a Set of Endoxylanases: Identification, Heterologous Expression, and Characterization of a Fourth Xylanase, XynD, a Novel Enzyme Belonging to Glycoside Hydrolase Family 10.

The fungus Penicillium purpurogenum grows on a variety of natural carbon sources and secretes a large number of enzymes which degrade the polysaccharides present in lignocellulose. In this work, the gene coding for a novel endoxylanase has been identified in the genome of the fungus. This gene (xynd) possesses four introns. The cDNA has been expressed in Pichia pastoris and characterized. The enzyme, XynD, belongs to family 10 of the glycoside hydrolases. Mature XynD has a calculated molecular weight of 40,997. It consists of 387 amino acid residues with an N-terminal catalytic module, a linker rich in ser and thr…

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Tuesday, April 21, 2020

Complete Genome Sequence of Sequevar 14M Ralstonia solanacearum Strain HA4-1 Reveals Novel Type III Effectors Acquired Through Horizontal Gene Transfer.

Ralstonia solanacearum, which causes bacterial wilt in a broad range of plants, is considered a “species complex” due to its significant genetic diversity. Recently, we have isolated a new R. solanacearum strain HA4-1 from Hong’an county in Hubei province of China and identified it being phylotype I, sequevar 14M (phylotype I-14M). Interestingly, we found that it can cause various disease symptoms among different potato genotypes and display different pathogenic behavior compared to a phylogenetically related strain, GMI1000. To dissect the pathogenic mechanisms of HA4-1, we sequenced its whole genome by combined sequencing technologies including Illumina HiSeq2000, PacBio RS II, and…

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