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MinION DNA barcoding of nematodes

ABSTRACT: DNA barcoding of nematodes using the MinION

PROVIDER: PRJEB37489 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR4030415_1.fastq.gz	Fastqsanger.gz
	ERR4030416_1.fastq.gz	Fastqsanger.gz
	ERR4030417_1.fastq.gz	Fastqsanger.gz
	ERR4030418_1.fastq.gz	Fastqsanger.gz

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Project description:Background: Epigenetic processes play an important role in the plant response to adverse environmental conditions. A role for DNA hypomethylation has recently been suggested in the pathogenic interaction between bacteria and plants, yet it remains unclear whether this phenomenon reflects a conserved and general plant immunity response. We therefore investigated the role of DNA methylation in the plant defence against damaging parasitic nematodes. Methods and results: Treatment of roots of rice (monocot plant) and tomato (dicot plant) by a nematode-associated molecular pattern (NAMP) from different parasitic nematodes revealed global DNA hypomethylation using ELISA based quantification, suggesting conservation among plants. Focusing on root-knot induced gall tissue in rice, the causal impact of hypomethylation on immunity was revealed by a significantly reduced plant susceptibility upon 5-Azacitidine treatment. Whole genome bisulfite sequencing revealed that hypomethylation was massively present in the CHH context, while absent for CpG or CHG nucleotide contexts. CHH hypomethylated regions were predominantly associated with gene promoter regions, which was not correlated with activated gene expression at the same time point, but rather showed a delayed effect on transcriptional gene activation. Finally, the relevance of CHH hypomethylation in plant defence was confirmed in rice mutants of the RNA-directed DNA methylation pathway (RdDM) and DDM1, which are known to be steering DNA methylation in CHH context. Conclusions: We demonstrated that DNA hypomethylation confers enhanced defence in rice towards root-parasitic nematodes and is likely to be part of the basal NAMP-triggered immunity response in plants.

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Project description:Since the release of the MinION sequencer in 2014, it has been applied to great effect in the remotest and harshest of environments, and even in space. One of the most common applications of MinION is for nanopore-based DNA barcoding in situ for species identification and discovery, yet the existing sample capability is limited (n ≤ 10). Here, we assembled a portable sequencing setup comprising the BentoLab and MinION and developed a workflow capable of processing 32 samples simultaneously. We demonstrated this enhanced capability out at sea, where we collected samples and barcoded them onboard a dive vessel moored off Sisters' Islands Marine Park, Singapore. In under 9 h, we generated 105 MinION barcodes, of which 19 belonged to fresh metazoans processed immediately after collection. Our setup is thus viable and would greatly fortify existing portable DNA barcoding capabilities. We also tested the performance of the newly released R10.3 nanopore flow cell for DNA barcoding, and showed that the barcodes generated were ~99.9% accurate when compared to Illumina references. A total of 80% of the R10.3 nanopore barcodes also had zero base ambiguities, compared to 50-60% for R9.4.1, suggesting an improved homopolymer resolution and making the use of R10.3 highly recommended.

| S-EPMC7598690 | biostudies-literature

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