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An Ultrahigh-throughput Microfluidic Platform for Single-cell Genome Sequencing
Published on: May 23, 2018
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Photoselective sequencing: microscopically guided genomic measurements with subcellular resolution
Sarah M Mangiameli1,2, Haiqi Chen1,3,4, Andrew S Earl2
1Gene Regulation Observatory, The Broad Institute of MIT and Harvard, Cambridge, MA, USA.
Nature Methods
|April 27, 2023
Summary
Photoselective sequencing enables genomic and epigenomic profiling in specific spatial regions of biological samples. This method reveals cell-type-specific chromatin accessibility and nuclear organization, advancing spatial biology research.
Area of Science:
- Genomics
- Epigenomics
- Spatial Biology
- Cellular Imaging
Background:
- Spatial organization is crucial for biological function.
- Existing methods lack the resolution to profile genomic features in specific spatial regions.
- Understanding cell-type-specific genomic and epigenomic landscapes within intact tissues is essential.
Purpose of the Study:
- To introduce photoselective sequencing, a novel method for spatially resolved genomic and epigenomic profiling.
- To demonstrate the application of photoselective sequencing in analyzing chromatin accessibility in distinct cell types within the mouse brain.
- To investigate the relationship between chromatin features and subcellular positioning.
Main Methods:
- Photoselective sequencing utilizes targeted illumination to unblock photocaged fragment libraries.
- Genomic and epigenomic profiling is restricted to microscopically identified spatial regions.
- Chromatin accessibility profiles were measured in fluorescently labeled cell types in the mouse brain.
- Computational deconvolution strategies were employed to analyze bulk accessibility profiles.
Main Results:
- Validated photoselective sequencing by accurately measuring chromatin accessibility in mouse brain cell types.
- Identified regional differences in oligodendrocyte progenitor cell enrichment between the cortex and corpus callosum.
- Revealed chromatin features correlated with nuclear peripheral positioning at the subcellular level.
Conclusions:
- Photoselective sequencing is a versatile and generalizable platform for spatial genomic and epigenomic analysis.
- The method allows for the exploration of the interplay between spatial structure and genomic/epigenomic properties.
- This technique opens new avenues for high-resolution biological investigation within intact specimens.
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