Long-read structural and epigenetic profiling of a kidney tumor-matched sample with nanopore sequencing and optical genome mapping

Sapir Margalit, Zuzana Tulpová, Tahir Detinis Zur, Yael Michaeli, Jasline Deek, Gil Nifker, Rita Haldar, Yehudit Gnatek, Dorit Omer, Benjamin Dekel, Hagit Baris Feldman, Assaf Grunwald*, Yuval Ebenstein*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Carcinogenesis often involves significant alterations in the cancer genome, marked by large structural variants (SVs) and copy number variations (CNVs) that are difficult to capture with short-read sequencing. Traditionally, cytogenetic techniques are applied to detect such aberrations, but they are limited in resolution and do not cover features smaller than several hundred kilobases. Optical genome mapping (OGM) and nanopore sequencing [Oxford Nanopore Technologies (ONT)] bridge this resolution gap and offer enhanced performance for cytogenetic applications. Additionally, both methods can capture epigenetic information as they profile native, individual DNA molecules. We compared the effectiveness of the two methods in characterizing the structural, copy number and epigenetic landscape of a clear cell renal cell carcinoma tumor. Both methods provided comparable results for basic karyotyping and CNVs, but differed in their ability to detect SVs of different sizes and types. ONT outperformed OGM in detecting small SVs, while OGM excelled in detecting larger SVs, including translocations. Differences were also observed among various ONT SV callers. Additionally, both methods provided insights into the tumor’s methylome and hydroxymethylome. While ONT was superior in methylation calling, hydroxymethylation reports can be further optimized. Our findings underscore the importance of carefully selecting the most appropriate platform based on specific research questions.

Original languageEnglish
Article numberlqae190
JournalNAR Genomics and Bioinformatics
Volume7
Issue number1
DOIs
StatePublished - 1 Mar 2025

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