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. 1996 Jul 9;93(14):6863–6868. doi: 10.1073/pnas.93.14.6863

Differential display of intestinal mRNAs regulated by dietary zinc.

R K Blanchard 1, R J Cousins 1
PMCID: PMC38899  PMID: 8692909

Abstract

Regulation of gene expression by zinc is well established, especially through the metal response elements of the metallothionein genes; however, most other aspects of the functions of zinc in gene expression remain unknown. We have looked for intestinal mRNAs that are regulated by dietary zinc status. Using the reverse transcriptase-PCR method of mRNA differential display, we compared intestinal mRNA from rats that were maintained for 18 days in one of three dietary groups: zinc-deficient, zinc-adequate, and pair-fed zinc-adequate. At the end of this period, total RNA was prepared from the intestine and analyzed by mRNA differential display. Under these conditions, only differentially displayed cDNA bands that varied in the zinc-deficient group, relative to the zinc-adequate groups, were selected. Utilizing two anchored oligo-dT3' PCR primers and a total of 27 arbitrary decamers as 5' PCR primers, our results yielded 47 differentially displayed cDNA bands from intestinal RNA. Thirty were increased in zinc deficiency, and 17 were decreased. Nineteen bands were subcloned and sequenced. Eleven of these were detectable on Northern blots, of which four were confirmed as regulated. Three of these have homology to known genes: cholecystokinin, uroguanylin, and ubiquinone oxidoreductase. The fourth is a novel sequence as it has no significant homology in GenBank. The remainder of those cloned included novel sequences, as well as matches to reported expressed sequence tags, and functionally identified genes. Further characterization of the regulated sequences identified here will show whether they are primary or secondary effects of zinc deficiency.

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