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Updated: Jan 7, 2026

Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae
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A breakage-replication/fusion process explains complex rearrangements and segmental DNA amplification.

Cheng-Zhong Zhang1,2,3, Carlos Mendez-Dorantes4,5,6, Kathleen H Burns4,5,6

  • 1Department of Data Sciences, Dana-Farber Cancer Institute, Boston, MA, USA. cheng-zhong_zhang@dfci.harvard.edu.

Nature Genetics
|January 2, 2026
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Summary
This summary is machine-generated.

A new mechanism called breakage-replication/fusion explains how segmental copy-number gains occur. This process, identified in human diseases and experimental evolution, involves adjacent parallel breakpoints and clarifies complex genomic rearrangements.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Segmental copy-number gains significantly contribute to human genetic variation and disease.
  • The precise mechanisms driving these genomic alterations are not fully understood.

Purpose of the Study:

  • To elucidate a general mechanism for segmental copy-number gain.
  • To explain the origin of complex genomic rearrangements, including those in chromothripsis.

Main Methods:

  • Analysis of experimental evolution data.
  • Examination of human disease genomes.
  • Identification of specific genomic features like adjacent parallel breakpoints.

Main Results:

  • A novel mechanism, 'breakage-replication/fusion,' is proposed for segmental copy-number gain.
  • Adjacent parallel breakpoints are identified as a hallmark of this mechanism.
  • This mechanism explains various complex rearrangements, including short insertions and inverted segment amplifications.

Conclusions:

  • The breakage-replication/fusion model provides a revised mechanistic understanding of chromothripsis.
  • This framework offers new insights into the evolutionary origins of segmental DNA duplication.