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Author Spotlight: Characterizing DNA Replication of Pathogenic Repeats to Uncover Mechanisms of Replication Fork Stalling and Expansion
Published on: September 13, 2024
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Recurrent inversion polymorphisms in humans associate with genetic instability and genomic disorders.
David Porubsky1, Wolfram Höps2, Hufsah Ashraf3
1Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA.
Cell
|May 7, 2022
Summary
We identified 729 human inversions, a poorly understood genetic variation. Recurrent inversions, often near segmental duplications, contribute to genomic disorders and increased mutation rates.
Area of Science:
- Genomics
- Human Genetics
- Molecular Biology
Background:
- Inversions are an understudied class of genetic variation compared to copy number variants (CNVs).
- Understanding inversion formation and their impact is crucial for human genetics research.
Purpose of the Study:
- To comprehensively identify and characterize inversions in the human genome.
- To investigate the mechanisms of inversion formation, particularly recurrent inversions.
- To explore the association between inversions, segmental duplications, and genomic disorders.
Main Methods:
- Integration of multiple genomic technologies for inversion detection.
- Bioinformatic analysis to characterize inversion size, type, and flanking sequences.
- Development of methods to identify recurrent inversion formation.
Main Results:
- Discovery of 729 inversions in 41 human genomes.
- Characterization of formation mechanisms for small (<2 kbp) and large inversions.
- Identification of 40 recurrent inversions, with high formation rates and a sex-chromosomal bias.
- Observation that 72% of balanced inversions are flanked by segmental duplications (SDs) or retrotransposons.
- Recurrent inversions co-localize with genomic disorder critical regions.
Conclusions:
- Inversions, especially recurrent ones, play a significant role in human genome variation and disease.
- Flanking repeats like SDs facilitate recurrent inversion formation.
- Inversion recurrence contributes to genetic diversity, mutability, and predisposition to certain genetic disorders.
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