Easily isolate long DNA fragments that overcome challenges of sequencing large and complex plant genomes
Angiosperm genome sizes span 4 orders of magnitude2
Percent of genome consisting of repeat sequences and transposable elements increases with genome size2
Most published plant genomes are 15 % incomplete due to high copy number repeats2
We used Xdrop™ to investigate the gene cluster that synthesizes falcarindiol in the tomato plant. Metabolic and mRNA expression analyses published by researchers at Stanford University had identified 8 candidate genes of the cluster.3 Alas, only 2 were partially matched in the reference genome and an attempted WGS using Oxford Nanopore Technology generated 4 Gb of data but only 3 reads in the region of interest! With Xdrop™, we achieved 977-fold enrichment of a 100 kb region around one of the identified genes. Sequencing coverage when reads were mapped was about 80x in the target region, and some reads even spanned missing genes in the reference genome (visible as breakpoints in the coverage graph).
1 Schatz, M.C., et al. 2012. Current challenges in de novo plant genome sequencing and assembly. Genome Biol. 13: 243.2 Michael, T.P. 2014. Plant genome size variation: bloating and purging DNA. Brief. Funct. Genomics 13: 308.3 Jeon, J.E., et al. 2020. A pathogen-responsive gene cluster for highly modified fatty acids in tomato. Cell 180: 176.
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