Evaluation of clinical formalin-fixed paraffin-embedded tissue quality for targeted-bisulfite sequencing

Hideki Ohmomo, Shohei Komaki, Kanako Ono, Yoichi Sutoh, Tsuyoshi Hachiya, Eri Arai, Hiroyuki Fujimoto, Teruhiko Yoshida, Yae Kanai, Makoto Sasaki, Atsushi Shimizu

Research output: Contribution to journalArticlepeer-review

Abstract

Formalin-fixed paraffin-embedded (FFPE) tissues are promising biological resources for genetic research. Recent improvements in DNA extraction from FFPE samples allowed the use of these tissues for multiple sequencing methods. However, fundamental research addressing the application of FFPE-derived DNA for targeted-bisulfite sequencing (TB-seq) is lacking. Here, we evaluated the suitability of FFPE-derived DNA for TB-seq. We conducted TB-seq using FFPE-derived DNA and corresponding fresh frozen (FF) tissues of patients with kidney cancer and compared the quality of DNA, libraries, and TB-seq statistics between the two preservation methods. The approximately 600-bp average fragment size of the FFPE-derived DNA was significantly shorter than that of the FF-derived DNA. The sequencing libraries constructed using FFPE-derived DNA and the mapping ratio were approximately 10 times and 10% lower, respectively, than those constructed using FF-derived DNA. In the mapped data of FFPE-derived DNA, duplicated reads accounted for > 60% of the obtained sequence reads, with lower mean on-target coverage. Therefore, the standard TB-seq protocol is inadequate for obtaining high-quality data for epigenetic analysis from FFPE-derived DNA, and technical improvements are necessary for enabling the use of archived FFPE resources.

Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalPathology international
Volume71
Issue number2
DOIs
Publication statusPublished - 2021 Feb

Keywords

  • DNA methylation
  • Epigenetics
  • Formalin-fixed paraffin-embedded tissue
  • Fresh frozen tissue
  • Targeted-bisulfite sequencing

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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