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Reconstructing extrachromosomal DNA structural heterogeneity from long-read sequencing data using Decoil.

Mădălina Giurgiu1,2,3,4, Nadine Wittstruck5,2,3, Elias Rodriguez-Fos5,2,3

  • 1Department of Pediatric Oncology and Hematology, Charité-Universitätsmedizin Berlin, 13353 Berlin, Germany; madalina.giurgiu@charite.de anton.henssen@charite.de knut.reinert@fu-berlin.de.

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Summary
This summary is machine-generated.

Decoil, a new computational method, reconstructs complex circular extrachromosomal DNA (ecDNA) structures from sequencing data. This advance aids in understanding cancer development and improving patient outcomes.

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Area of Science:

  • Genomics
  • Computational Biology
  • Cancer Research

Background:

  • Circular extrachromosomal DNA (ecDNA) represents oncogene amplification in various cancers, correlating with poor patient prognosis.
  • The complex and rearranged nature of ecDNA structures necessitates high-resolution analysis for understanding oncogene regulation and formation mechanisms.

Purpose of the Study:

  • To introduce Decoil, a novel computational method for reconstructing complex ecDNA structures.
  • To enable the deconvolution of co-occurring ecDNA elements with overlapping genomic footprints using long-read sequencing data.

Main Methods:

  • Decoil employs a breakpoint-graph approach combined with LASSO regression.
  • The method is designed to analyze long-read nanopore sequencing data.

Main Results:

  • Decoil demonstrates superior performance compared to de novo assembly and alignment-based methods for both simple and complex ecDNAs in simulated data.
  • Application of Decoil to whole-genome sequencing data revealed diverse ecDNA topologies and structural heterogeneity in neuroblastoma tumors and cell lines.

Conclusions:

  • Decoil offers an effective solution for resolving complex ecDNA structures, particularly those with shared genomic footprints.
  • This computational tool has the potential to significantly enhance the structural analysis of ecDNA in cancer research.