Background-suppressed live visualization of genomic loci with an improved CRISPR system based on a split fluorophore.

Abstract:

:The higher-order structural organization and dynamics of the chromosomes play a central role in gene regulation. To explore this structure-function relationship, it is necessary to directly visualize genomic elements in living cells. Genome imaging based on the CRISPR system is a powerful approach but has limited applicability due to background signals and nonspecific aggregation of fluorophores within nuclei. To address this issue, we developed a novel visualization scheme combining tripartite fluorescent proteins with the SunTag system and demonstrated that it strongly suppressed background fluorescence and amplified locus-specific signals, allowing long-term tracking of genomic loci. We integrated the multicomponent CRISPR system into stable cell lines to allow quantitative and reliable analysis of dynamic behaviors of genomic loci. Due to the greatly elevated signal-to-background ratio, target loci with only small numbers of sequence repeats could be successfully tracked, even under a conventional fluorescence microscope. This feature enables the application of CRISPR-based imaging to loci throughout the genome and opens up new possibilities for the study of nuclear processes in living cells.

journal_name

Genome Res

journal_title

Genome research

authors

Chaudhary N,Nho SH,Cho H,Gantumur N,Ra JS,Myung K,Kim H

doi

10.1101/gr.260018.119

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

1306-1316

issue

9

eissn

1088-9051

issn

1549-5469

pii

gr.260018.119

journal_volume

30

pub_type

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