Two-color in-resin CLEM of Epon-embedded cells using osmium resistant green and red fluorescent proteins.

Abstract:

:In-resin CLEM of Epon embedded samples can greatly simplify the correlation of fluorescent images with electron micrographs. The usefulness of this technique is limited at present by the low number of fluorescent proteins that resist CLEM processing. Additionally, no study has reported the possibility of two-color in-resin CLEM of Epon embedded cells. In this study, we screened for monomeric green and red fluorescent proteins that resist CLEM processing. We identified mWasabi, CoGFP variant 0, and mCherry2; two green and one red fluorescent proteins as alternatives for in-resin CLEM. We expressed mitochondria-localized mCherry2 and histone H2B tagged with CoGFP variant 0 in cells. Green and red fluorescence was detected in 100 nm-thin sections of the Epon-embedded cells. In the same thin sections, we correlated the fluorescent signals to mitochondria and the nucleus using a scanning electron microscope. Similar results were obtained when endoplasmic reticulum-localized mCherry2 and histone H2B tagged with CoGFP variant 0 were expressed in the cells. Two-color in-resin CLEM of two cytoplasmic organelles, mitochondria and endoplasmic reticulum, was also achieved using mitochondria-localized mCherry2 and endoplasmic reticulum-localized mWasabi. In summary, we report three new fluorescent protein-alternatives suitable for in-resin CLEM of Epon-embedded samples, and achieved Epon-based two-color in-resin CLEM.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Tanida I,Furuta Y,Yamaguchi J,Kakuta S,Oliva Trejo JA,Uchiyama Y

doi

10.1038/s41598-020-78879-x

subject

Has Abstract

pub_date

2020-12-14 00:00:00

pages

21871

issue

1

issn

2045-2322

pii

10.1038/s41598-020-78879-x

journal_volume

10

pub_type

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