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Use of the iNo score to discriminate normal from altered nucleolar morphology, with applications in basic cell biology and potential in human disease diagnostics

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Stamatopoulou, Vassiliki [ULB] Parisot, Pascaline [UCL] De Vleeschouwer, Christophe [UCL] Lafontaine, Denis L. J. [ULB]

Ribosome biogenesis is initiated in the nucleolus, a cell condensate essential to gene expression, whose morphology informs cancer pathologists on the health status of a cell. Here, we describe a protocol for assessing, both qualitatively and quantitatively, the involvement of trans-acting factors in the nucleolar structure. The protocol involves use of siRNAs to deplete cells of factors of interest, fluorescence imaging of nucleoli in an automated high-throughput platform, and use of dedicated software to determine an index of nucleolar disruption, the iNo score. This scoring system is unique in that it integrates the five most discriminant shape and textural features of the nucleolus into a parametric equation. Determining the iNo score enables both qualitative and quantitative factor classification with prediction of function (functional clustering), which to our knowledge is not achieved by competing approaches, as well as stratification of their effect (severity of defects) on nucleolar structure. The iNo score has the potential to be useful in basic cell biology (nucleolar structure–function relationships, mitosis, and senescence), developmental and/or organismal biology (aging), and clinical practice (cancer, viral infection, and reproduction). The entire protocol can be completed within 1 week.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès interdit
Publication date 2018
Language Anglais
Journal information "Nature Protocols" - Vol. 13, no.10, p. 2387-2406 (2018)
Peer reviewed yes
Publisher Springer Nature America, Inc
issn 1754-2189
e-issn 1750-2799
Publication status Publié
Affiliation UCL - SST/ICTM/ELEN - Pôle en ingénierie électrique
Keywords General Biochemistry ; Genetics and Molecular Biology
Links
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Bibliographic reference Stamatopoulou, Vassiliki ; Parisot, Pascaline ; De Vleeschouwer, Christophe ; Lafontaine, Denis L. J.. Use of the iNo score to discriminate normal from altered nucleolar morphology, with applications in basic cell biology and potential in human disease diagnostics. In: Nature Protocols, Vol. 13, no.10, p. 2387-2406 (2018)
Permanent URL http://hdl.handle.net/2078.1/203723