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Authors: Sohn, Seong-Han and Ahn, Yul-Kyun and Lee, Tae-Ho and Lee, Jong-Eun and Jeong, Min-Hee and Seo, Chae-Hwa and Chandra, Romika and Kwon, Young-Seok and Kim, Cheol-Woo and Kim, Do-Sun and Won, So-Youn and Kim, Jung Sun and Choi, Dongsu

To obtain intact and full-length RNA transcripts of onion (Allium cepa), long-read sequencing technology was first applied. Total RNAs extracted from four tissues; flowers, leaves, bulbs and roots, of red--purple and yellow-colored onions (A. cepa) were sequenced using long-read sequencing (RSII platform, P4-C2 chemistry). The 99,247 polished high-quality isoforms were produced by sequence correction processes of consensus calling, quality filtering, orientation verification, misread-nucleotide correction and dot-matrix view. The dot-matrix view was subsequently used to remove artificial inverted repeats (IRs), and resultantly 421 IRs were removed. The remaining 98,826 isoforms were condensed to 35,505 through the removal process of redundant isoforms. To assess the completeness of the 35,505 isoforms, the ratio of full-length isoforms, short-read mapping to the isoforms, and differentially expressed genes among the four tissues were analyzed along with the gene ontology across the tissues. As a result, the 35,505 isoforms were verified as a collection of isoforms with high completeness, and designated as draft reference transcripts (DRTs, ver 1.0) constructed by long-read sequencing.

Journal: Plant biotechnology reports
DOI: 10.1007/s11816-016-0409-4
Year: 2016

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