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Updated: Oct 7, 2025

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Published on: September 11, 2022
Detection of HAC1 mRNA Splicing by RT-PCR in Saccharomyces cerevisiae
Jagadeesh Kumar Uppala1, Madhusudan Dey2
1Department of Biological Sciences, University of Wisconsin-Milwaukee, Milwaukee, WI, USA.
Abstract:
HAC1 mRNA remains translationally repressed in the cytoplasm of the budding yeast Saccharomyces cerevisiae. Under conditions of cellular stress, a dual kinase RNase IRE1 (Inositol Requiring Enzyme-1) cleaves out an intervening sequence from the HAC1 mRNA. Cleaved mRNAs are then ligated by tRNA ligase, thus generating a spliced mRNA that translates an active transcription factor. This unconventional splicing of HAC1 mRNA in the cytoplasm is a molecular marker for various cellular stresses including oxidative stress and endoplasmic reticulum (ER) stress. This article describes a PCR-based protocol to detect the HAC1 mRNA splicing.
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