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Updated: Aug 9, 2025

Discovery of Driver Genes in Colorectal HT29-derived Cancer Stem-Like Tumorspheres
Published on: July 22, 2020
Long-read sequencing identifies novel structural variations in colorectal cancer
Luming Xu1,2, Xingyue Wang1,2, Xiaohuan Lu2,3
1Department of Clinical Laboratory, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Long-read sequencing identified over 5000 novel structural variations (SVs) in colorectal cancer (CRC), revealing gene alterations that drive cancer progression and metastasis. This genomic approach offers potential for precise CRC diagnosis and personalized treatments.
Area of Science:
- Genomics
- Cancer Biology
- Bioinformatics
Background:
- Structural variations (SVs) are crucial in cancer development, but short-read sequencing limits their detection in colorectal cancer (CRC).
- Understanding SVs in CRC is vital for advancing cancer genomics and personalized medicine.
Purpose of the Study:
- To investigate somatic SVs in CRC using Nanopore whole-genome long-read sequencing.
- To identify novel SVs and their functional impact on critical genes in colorectal cancer.
Main Methods:
- Whole-genome sequencing of 21 paired CRC samples using Nanopore long-read technology.
- Bioinformatic analysis to detect and characterize somatic structural variations.
- RNA-sequencing and in vitro/in vivo assays to confirm functional impact of identified SVs.
Main Results:
- Identification of 5200 novel somatic SVs across 21 CRC patients (average 494 SVs/patient).
- Discovery of a 4.9-Mbp inversion silencing APC expression and an 11.2-kbp inversion altering CFTR.
- Detection of two novel gene fusions impacting RNF38 (metastasis-promoting) and SMAD3.
- Validation of RNF38 fusion's metastasis-promoting ability through functional assays.
Conclusions:
- Nanopore long-read sequencing significantly enhances the detection of complex SVs in CRC.
- Somatic SVs structurally alter critical genes, influencing oncogenesis and metastasis in CRC.
- This approach holds promise for precise CRC diagnosis and personalized therapeutic strategies.
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