Protocol to measure inter-centrosome distance in adherent cells using epifluorescence microscopy

We present here a protocol to assay the centrosome separation events at late-G2 phase of the cell cycle by immunofluorescence microscopy. We describe the steps required for imaging and measurement of inter-centrosome distance. Here, we use GAS2L1 as an example, but the protocol can be used to test any protein for a role in centrosome separation and cohesion. The steps below are specific for hTERT RPE-1 cell lines, but other adherent cell lines (e.g., U2OS, MRC-5) are also amenable for this protocol. For complete details on the use and execution of this protocol, please refer to Au et al. (2017) and Au et al. (2020).