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A Chromatin Assay for Human Brain Tissue
Published on: March 21, 2008
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Single chromatin fiber profiling and nucleosome position mapping in the human brain
Cyril J Peter1, Aman Agarwal2, Risa Watanabe3
1Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Neuroscience, Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
Cell Reports Methods
|December 4, 2024
Summary
Single-molecule chromatin fiber sequencing (Fiber-seq) maps gene regulatory elements in human brain cells. This method reveals cell-specific chromatin architecture and regulatory patterns at high resolution.
Area of Science:
- Genomics
- Epigenetics
- Neuroscience
Background:
- Understanding cell-type-specific gene regulation is crucial for brain function.
- Existing epigenomic methods have limitations in resolving regulatory architecture at single-molecule resolution.
Purpose of the Study:
- To apply single-molecule chromatin fiber sequencing (Fiber-seq) to human brain tissue.
- To map the regulatory architecture of neuronal and non-neuronal cells at nucleosome resolution.
Main Methods:
- Fiber-seq protocol for amplification-free, cell-type-specific mapping.
- Analysis of ∼10-kb chromatin fibers from sorted human brain nuclei.
- Identification of transcription factor footprints and nucleosome positioning.
Main Results:
- Resolved cell-selective promoter and enhancer architectures on single chromatin fibers.
- Uncovered haplotype-specific chromatin patterns and cis-aligned regulatory elements.
- Mapped accessible chromatin at thousands of unique sites, including repeat sequences.
Conclusions:
- Fiber-seq is applicable to human brain tissue for epigenomic analysis.
- The method provides high-resolution mapping of open chromatin and nucleosome positioning.
- Fiber-seq enables genome-wide insights into regulatory architecture previously unmappable.
