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Revision as of 16:19, 24 July 2018

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Interlab

InterLab

Overview

Poverty in taking reliable and repeatable measurements remains a key obstacle in establishing synthetic biology as an engineering discipline. The Measurement Committee has been studying the measurement procedure for green fluorescent protein (GFP) over the last several years by interlab. The most commonly used markers though GFP is in synthetic biology, labs often resort to making relative comparisons, which makes it difficult for labs to share and data and/or constructs.

The goal of the fifth iGEM InterLab Study is to identify and correct the sources of systematic variability in synthetic biology measurements by answering the question "Can we reduce lab-to-lab variability in fluorescence measurements by normalizing to absolute cell count or colony-forming units (CFUs) instead of OD? "

As we know in the previous study, the fluorescence value measured by a plate reader is an aggregate measurement of an entire population of cells, we need to divide the total fluorescence by the number of cells in order to determine the mean expression level of GFP per cell. Due to the fact that the "optical density (OD)" of the sample is an approximation of the number of cells varying from lab to lab, we decided to use a special silica beads that are roughly the same size and shape as a typical E. coli cell to set up a universal, standard "equivalent concentration of beads" measurement.

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