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Genome sequence of Malania oleifera, a tree with great value for nervonic acid production.
GigaScience 2019 January 25
Background: Malania oleifera, a member of the Olacaceae family, is an IUCN Red Listed tree, endemic and restricted to the Karst region of South West China. This tree's seed is valued for its high content of precious fatty acids (especially nervonic acid). However, studies on its genetic make-up, and fatty acid biogenesis are severely hampered by a lack of molecular and genetic tools.
Findings: We generated 51 Gigabases (Gb) and 135 Gb of raw DNA sequences, using PacBio Single-Molecule Real-Time (SMRT) and 10x Genomics sequencing, respectively. A final genome assembly, with a scaffold N50 size of 4.65 Megabases (Mb) and a total length of 1.51 Gb, was obtained by primary assembly based on PacBio long reads plus scaffolding with 10x Genomics reads. Identified repeats constituted ∼82% of the genome, and 24,064 protein-coding genes were predicted with high support. The genome has low heterozygosity and shows no evidence for recent whole genome duplication. Metabolic pathway genes relating to the accumulation of long chain fatty acid were identified and studied in detail.
Conclusions: Here, we provide the first genome assembly and gene annotation for M. oleifera. The availability of these resources will be of great importance for conservation biology, and for the functional genomics of nervonic acid biosynthesis.
Findings: We generated 51 Gigabases (Gb) and 135 Gb of raw DNA sequences, using PacBio Single-Molecule Real-Time (SMRT) and 10x Genomics sequencing, respectively. A final genome assembly, with a scaffold N50 size of 4.65 Megabases (Mb) and a total length of 1.51 Gb, was obtained by primary assembly based on PacBio long reads plus scaffolding with 10x Genomics reads. Identified repeats constituted ∼82% of the genome, and 24,064 protein-coding genes were predicted with high support. The genome has low heterozygosity and shows no evidence for recent whole genome duplication. Metabolic pathway genes relating to the accumulation of long chain fatty acid were identified and studied in detail.
Conclusions: Here, we provide the first genome assembly and gene annotation for M. oleifera. The availability of these resources will be of great importance for conservation biology, and for the functional genomics of nervonic acid biosynthesis.
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