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Differential display identifies genes in chinese hamster ovary cells sensitive to elevated ammonium

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Abstract

Ammonium is a toxic waste product that has been reported to negatively inhibit cell growth and recombinant glycosylation in Chinese hamster ovary (CHO) cells; however, the effect of this toxicity on intracellular gene expression has received only limited investigation. We used a differential display method to identify genes in CHO cells that were affected by ammonium stress. Eight genes whose mRNA levels significantly changed in response to elevated ammonium were isolated and identified. Five of the genes were identified as having lower expression under the ammonium stress, whereas three genes were identified as having higher expression. Sequence homology with other mammalian organisms was used to attribute function to these newly identified genes. The identified ammonium-sensitive genes were grouped into three broad functional groups: cellular processes, energy metabolism, and genetic-information processing. The three cellular process-related genes had lower expression (anaphase-promoting complex subunit 5, eukaryotic initiation factor 5A II, KIAA1091 protein). The two energy-related genes had higher expression under ammonium stress (adenosine triphosphate synthase subunit C and mitofusin 1). Both of the genetic information-processing genes (endoplasmic reticulum [ER]-resident protein ERdj5 and structure-specific recognition protein 1) had lower expression under the ammonium stress, whereas the 26S proteasome subunit adenosine triphosphatase 3 gene had higher expression. These preliminary results indicate that ammonium stress lowers expression of genes controlling cell cycle, protein folding, and quality and raises genes that control energy metabolism and degradation. Our findings demonstrate the usefulness of mRNA differential-display techniques for the detection of CHO cell genes affected by ammonium stress.

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, Clemson University, 125 Earle Hall, 29634-0909, Clemson, SC

    Peifeng Chen

  2. Department of Bioengineering, 501 Rhodes Research Center, Clemson University, 29634-0905, Clemson, SC

    Sarah W. Harcum

  3. Invitrogen Corp., 3175 Staley Road, 14072, Grand Island, NY

    Peifeng Chen

Authors
  1. Peifeng Chen
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  2. Sarah W. Harcum
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Correspondence to Sarah W. Harcum.

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Chen, P., Harcum, S.W. Differential display identifies genes in chinese hamster ovary cells sensitive to elevated ammonium. Appl Biochem Biotechnol 141, 349–359 (2007). https://doi.org/10.1007/BF02729072

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  • DOI: https://doi.org/10.1007/BF02729072

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