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Accurate and live peroxisome biogenesis evaluation achieved by lentiviral expression of a green fluorescent protein fused to a peroxisome targeting signal 1

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Abstract

Peroxisomes are ubiquitous organelles formed by peroxisome biogenesis (PB). During PB, peroxisomal matrix proteins harboring a peroxisome targeting signal (PTS) are imported inside peroxisomes by peroxins, encoded by PEX genes. Genetic alterations in PEX genes lead to a spectrum of incurable diseases called Zellweger spectrum disorders (ZSD). In vitro drug screening is part of the quest for a cure in ZSD by restoring PB in ZSD cell models. In vitro PB evaluation is commonly achieved by immunofluorescent staining or transient peroxisome fluorescent reporter expression. Both techniques have several drawbacks (cost, time-consuming technique, etc.) which we overcame by developing a third-generation lentiviral transfer plasmid expressing an enhanced green fluorescent protein fused to PTS1 (eGFP–PTS1). By eGFP–PTS1 lentiviral transduction, we quantified PB and peroxisome motility in ZSD and control mouse and human fibroblasts. We confirmed the stable eGFP–PTS1 expression along cell passages. eGFP signal analysis distinguished ZSD from control eGFP–PTS1-transduced cells. Live eGFP–PTS1 transduced cells imaging quantified peroxisomes motility. In conclusion, we developed a lentiviral transfer plasmid allowing stable eGFP–PTS1 expression to study PB (deposited on Addgene: #133282). This tool meets the needs for in vitro PB evaluation and ZSD drug discovery.

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Acknowledgments

We acknowledge the patients for their implication in the study, Caroline Bouzin for the help with immunofluorescent staining, Caroline Daems for her great cloning tips, Valery Payen for the useful discussions about lentivirus production, and Julie Vandewalle for the proofreading. pEGFP-C1 + SKL was a gift from Jay Brenman (Addgene plasmid #53450), pRRLSIN.cPPT.PGK-GFP.WPRE, pMDLg/pRRE, and pRSV-Rev were a gift from Didier Trono (Addgene plasmid #12252, #12251, and #12253), and pCMV-VSV-G was a gift from Bob Weinberg (Addgene plasmid #8454); we thank them for their contributions. We are thankful to the reviewers for their relevant remarks and suggestions.

Funding

Tanguy DEMARET is FRIA Grant Holder of the Fonds de la Recherche Scientifique-FNRS.

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Contributions

Conceptualization: TD, MN, and ES. Methodology: TD, GC, JR, and PVDS. Software: TD, GC, and PVDS. Validation: TD and JR. Formal analysis: TD. Data curation: TD. Writing—original draft preparation: TD. Writing—review and editing: TD, GC, JR, PVDS, MN, and ES. Supervision: MN and ES. Funding acquisition: TD and ES.

Corresponding author

Correspondence to Etienne M. Sokal.

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Conflict of interest

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (Comission d’Ethique Hospitalo-Facultaire, Cliniques Universitaires Saint-Luc, F/2005/04) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted (Ethical Committee for Animal Experimentation at the Health Science Sector, UCLouvain, 2017/UCL/MD/006).

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Demaret, T., Courtoy, G.E., Ravau, J. et al. Accurate and live peroxisome biogenesis evaluation achieved by lentiviral expression of a green fluorescent protein fused to a peroxisome targeting signal 1. Histochem Cell Biol 153, 295–306 (2020). https://doi.org/10.1007/s00418-020-01855-z

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  • DOI: https://doi.org/10.1007/s00418-020-01855-z

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