Washington University in St. Louis

New Publication for Djuranovic Lab

Congratulations to Laura Arthur and the Djuranovic Lab on their publication in Nature Communications!  Their work provides a universal tookkit for modifying gene expression.

See News Release

Arthur, LL, Chung, JJ, Janakirama, P, Keefer, KM, Kolotilin, I, Pavlovic-Djuranovic, S, Chalker, DL, Grbic, V, Green, R, Menassa, R, True, HL, Skeath, JB and Djuranovic, S. (2017) Rapid Generation of Hypomorphic Mutations, Nature Communications [E-published January 20]

Abstract:  Hypomorphic mutations are a valuable tool for both genetic analysis of gene function and for synthetic biology applications. However, current methods to generate hypomorphic mutations are limited to a specific organism, change gene expression unpredictably, or depend on changes in spatial-temporal expression of the targeted gene. Here we present a simple and predictable method to generate hypomorphic mutations in model organisms by targeting translation elongation. Adding consecutive adenosine nucleotides, so-called polyA tracks, to the gene coding sequence of interest will decrease translation elongation efficiency, and in all tested cell cultures and model organisms, this decreases mRNA stability and protein expression. We show that protein expression is adjustable independent of promoter strength and can be further modulated by changing sequence features of the polyA tracks. These characteristics make this method highly predictable and tractable for generation of programmable allelic series with a range of expression levels.


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