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Fluorescent Gene Tagging of Transcriptionally Silent Genes in HiPSCs

Abstract

We describe a multistep method for endogenous tagging of transcriptionally silent genes in human induced pluripotent stem cells (hiPSCs). A monomeric EGFP (mEGFP) fusion tag and a constitutively expressed mCherry fluorescence selection cassette were delivered in tandem via homology-directed repair to five genes not expressed in hiPSCs but important for cardiomyocyte sarcomere function: TTN, MYL7, MYL2, TNNI1, and ACTN2. CRISPR/Cas9 was used to deliver the selection cassette and subsequently mediate its excision via microhomology-mediated end-joining and non-homologous end-joining. Most excised clones were effectively tagged, and all properly tagged clones expressed the mEGFP fusion protein upon differentiation into cardiomyocytes, allowing live visualization of these cardiac proteins at the sarcomere. This methodology provides a broadly applicable strategy for endogenously tagging transcriptionally silent genes in hiPSCs, potentially enabling their systematic and dynamic study during differentiation and morphogenesis.

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References
1.
Doyon J, Zeitler B, Cheng J, Cheng A, Cherone J, Santiago Y . Rapid and efficient clathrin-mediated endocytosis revealed in genome-edited mammalian cells. Nat Cell Biol. 2011; 13(3):331-7. PMC: 4113319. DOI: 10.1038/ncb2175. View

2.
Luther P . The vertebrate muscle Z-disc: sarcomere anchor for structure and signalling. J Muscle Res Cell Motil. 2009; 30(5-6):171-85. PMC: 2799012. DOI: 10.1007/s10974-009-9189-6. View

3.
Palpant N, Pabon L, Roberts M, Hadland B, Jones D, Jones C . Inhibition of β-catenin signaling respecifies anterior-like endothelium into beating human cardiomyocytes. Development. 2015; 142(18):3198-209. PMC: 4582173. DOI: 10.1242/dev.117010. View

4.
Kim S, Matsumoto T, Kagawa H, Nakamura M, Hirohata R, Ueno A . Microhomology-assisted scarless genome editing in human iPSCs. Nat Commun. 2018; 9(1):939. PMC: 5838097. DOI: 10.1038/s41467-018-03044-y. View

5.
Lackner D, Carre A, Guzzardo P, Banning C, Mangena R, Henley T . A generic strategy for CRISPR-Cas9-mediated gene tagging. Nat Commun. 2015; 6:10237. PMC: 4703899. DOI: 10.1038/ncomms10237. View