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Tuesday, April 21, 2020

Chromosome-level reference genome of X12, a highly virulent race of the soybean cyst nematode Heterodera glycines.

Soybean cyst nematode (SCN, Heterodera glycines) is a major pest of soybean that is spreading across major soybean production regions worldwide. Increased SCN virulence has recently been observed in both the United States and China. However, no study has reported a genome assembly for H. glycines at the chromosome scale. Herein, the first chromosome-level reference genome of X12, an unusual SCN race with high infection ability, is presented. Using whole-genome shotgun (WGS) sequencing, PacBio sequencing, Illumina paired-end sequencing, 10X Genomics linked reads and high-throughput chromatin conformation capture (Hi-C) genome scaffolding techniques, a 141.01-Mb assembled genome was obtained with scaffold and…

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Tuesday, April 21, 2020

Chromosome-level assembly of the common lizard (Zootoca vivipara) genome

Squamate reptiles exhibit high variation in their traits and geographical distribution and are therefore fascinating taxa for evolutionary and ecological research. However, high-quality genomic recourses are very limited for this group of species, which inhibits some research efforts. To address this gap, we assembled a high-quality genome of the common lizard Zootoca vivipara (Lacertidae) using a combination of high coverage Illumina (shotgun and mate-pair) and PacBio sequence data, with RNAseq data and genetic linkage maps. The 1.46 Gbp genome assembly has scaffold N50 of 11.52 Mbp with N50 contig size of 220.4 Kbp and only 2.96% gaps. A BUSCO analysis…

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Tuesday, April 21, 2020

Lateral transfers of large DNA fragments spread functional genes among grasses.

A fundamental tenet of multicellular eukaryotic evolution is that vertical inheritance is paramount, with natural selection acting on genetic variants transferred from parents to offspring. This lineal process means that an organism’s adaptive potential can be restricted by its evolutionary history, the amount of standing genetic variation, and its mutation rate. Lateral gene transfer (LGT) theoretically provides a mechanism to bypass many of these limitations, but the evolutionary importance and frequency of this process in multicellular eukaryotes, such as plants, remains debated. We address this issue by assembling a chromosome-level genome for the grass Alloteropsis semialata, a species surmised to…

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Tuesday, April 21, 2020

A reference genome for pea provides insight into legume genome evolution.

We report the first annotated chromosome-level reference genome assembly for pea, Gregor Mendel’s original genetic model. Phylogenetics and paleogenomics show genomic rearrangements across legumes and suggest a major role for repetitive elements in pea genome evolution. Compared to other sequenced Leguminosae genomes, the pea genome shows intense gene dynamics, most likely associated with genome size expansion when the Fabeae diverged from its sister tribes. During Pisum evolution, translocation and transposition differentially occurred across lineages. This reference sequence will accelerate our understanding of the molecular basis of agronomically important traits and support crop improvement.

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Tuesday, April 21, 2020

The sequencing and de novo assembly of the Larimichthys crocea genome using PacBio and Hi-C technologies.

Larimichthys crocea is an endemic marine fish in East Asia that belongs to Sciaenidae in Perciformes. L. crocea has now been recognized as an “iconic” marine fish species in China because not only is it a popular food fish in China, it is a representative victim of overfishing and still provides high value fish products supported by the modern large-scale mariculture industry. Here, we report a chromosome-level reference genome of L. crocea generated by employing the PacBio single molecule sequencing technique (SMRT) and high-throughput chromosome conformation capture (Hi-C) technologies. The genome sequences were assembled into 1,591 contigs with a total…

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Tuesday, April 21, 2020

The sequence and de novo assembly of Takifugu bimaculatus genome using PacBio and Hi-C technologies.

Takifugu bimaculatus is a native teleost species of the southeast coast of China where it has been cultivated as an important edible fish in the last decade. Genetic breeding programs, which have been recently initiated for improving the aquaculture performance of T. bimaculatus, urgently require a high-quality reference genome to facilitate genome selection and related genetic studies. To address this need, we produced a chromosome-level reference genome of T. bimaculatus using the PacBio single molecule sequencing technique (SMRT) and High-through chromosome conformation capture (Hi-C) technologies. The genome was assembled into 2,193 contigs with a total length of 404.21?Mb and a…

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Tuesday, April 21, 2020

Chromosome assembly of Collichthys lucidus, a fish of Sciaenidae with a multiple sex chromosome system.

Collichthys lucidus (C. lucidus) is a commercially important marine fish species distributed in coastal regions of East Asia with the X1X1X2X2/X1X2Y multiple sex chromosome system. The karyotype for female C. lucidus is 2n?=?48, while 2n?=?47 for male ones. Therefore, C. lucidus is also an excellent model to investigate teleost sex-determination and sex chromosome evolution. We reported the first chromosome genome assembly of C. lucidus using Illumina short-read, PacBio long-read sequencing and Hi-C technology. An 877?Mb genome was obtained with a contig and scaffold N50 of 1.1?Mb and 35.9?Mb, respectively. More than 97% BUSCOs genes were identified in the C. lucidus…

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