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Updated: Jun 13, 2026

Promoter Capture Hi-C: High-resolution, Genome-wide Profiling of Promoter Interactions
Published on: June 28, 2018
Conserved host genes act as anchors for fast-evolving piRNA clusters via promoter hijacking
Aleksandr Friman1,2, Anand Swaroop1
1Neurobiology, Neurodegeneration & Repair Laboratory, National Eye Institute, National Institutes of Health, 6 Center Dr, Bethesda, 20892, Maryland, USA.
Promoter hijacking allows dual-function loci to maintain essential gene functions while rapidly evolving piRNA clusters for genomic immunity. This mechanism updates immune memory without compromising host gene stability.
Area of Science:
- Genomics
- Molecular Biology
- Evolutionary Biology
Background:
- Piwi-interacting RNA (piRNA) clusters evolve rapidly yet are tightly regulated.
- A co-transcription mechanism involving coding genes has been proposed.
- The
Purpose of the Study:
- To investigate the
Main Methods:
- Developed a novel method using context-aware Hidden Markov Models to identify gene orthologs in poorly annotated mammalian genomes.
- Analyzed co-transcription of stochastic piRNA clusters.
- Investigated gene expression patterns in testes.
Main Results:
- Identified dual-function loci where host genes retain primary functions and acquire secondary immune functions via piRNA biogenesis.
- Demonstrated preferential expression of identified genes in testes, correlating with piRNA pathway activity.
- Showed that the secondary piRNA-generating regions are free from protein-coding constraints, allowing rapid accumulation of new targets.
Conclusions:
- The
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