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Chromophore‐Assisted Proximity Labeling of DNA Reveals Chromosomal Organization in Living Cells
Author(s) -
Ding Tao,
Zhu Liyuan,
Fang Yuxin,
Liu Yangluorong,
Tang Wei,
Zou Peng
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202005486
Subject(s) - heterochromatin , biology , genome , dna , human genome , gene , chromosome , computational biology , genetics , microbiology and biotechnology
The spatial arrangement of chromosome within the nucleus is linked to genome function and gene expression regulation. Existing genome‐wide mapping methods often rely on chemically crosslinking DNA with protein baits, which raises concerns of artifacts being introduced during cell fixation. By genetically targeting a photosensitizer protein to specific subnuclear locations, we achieved blue‐light‐activated labeling of local DNA with a bioorthogonal functional handle for affinity purification and sequence identification through next‐generation sequencing. When applied to the nuclear lamina in human embryonic kidney 293T cells, it revealed lamina‐associated domains (LADs) that cover 37.6 % of the genome. These LADs overlap with heterochromatin hallmarks and are depleted with CpG islands. This simple labeling method avoids the harsh treatment of chemical crosslinking and is generally applicable to the genome‐wide high‐resolution mapping of the spatial chromosome organization in living cells.