Molecular Ecology Resources |  November 12, 2015

Evaluation of the impact of RNA preservation methods of spiders for de novo transcriptome assembly

Authors:Nobuaki Kono1, Hiroyuki Nakamura2, Yusuke Ito2, Masaru Tomita1, Kazuharu Arakawa1

DOI: 10.1111/1755-0998.12485

  • 1. Institute for Advanced Biosciences, Keio University
  • 2. Spiber Inc.

With advances in high‐throughput sequencing technologies, de novo transcriptome sequencing and assembly has become a cost‐effective method to obtain comprehensive genetic information of a species of interest, especially in nonmodel species with large genomes such as spiders. However, high‐quality RNA is essential for successful sequencing, and sample preservation conditions require careful consideration for the effective storage of field‐collected samples. To this end, we report a streamlined feasibility study of various storage conditions and their effects on de novo transcriptome assembly results. The storage parameters considered include temperatures ranging from room temperature to -80°C; preservatives, including ethanol, RNAlater, TRIzol and RNAlater‐ICE; and sample submersion states. As a result, intact RNA was extracted and assembly was successful when samples were preserved at low temperatures regardless of the type of preservative used. The assemblies as well as the gene expression profiles were shown to be robust to RNA degradation, when 30 million 150‐bp paired‐end reads are obtained. The parameters for sample storage, RNA extraction, library preparation, sequencing and in silico assembly considered in this work provide a guideline for the study of field‐collected samples of spiders.

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本研究の遂行に際し、当社は 内閣府 革新的研究開発推進プログラム(ImPACT)「超高機能構造タンパク質による素材産業革命」の助成を受けました。