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Example sentences for: hnt
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An added benefit of these constructions is the availability of yeast strains that possess high levels of dinucleoside polyphosphates and at the same time express a mutant Fhit-homologous protein, because these are conditions which have been postulated to constitute the signaling form of Fhit [ 16 ] . Finally, using controlled genotypes we revisited conditions that lead to increased accumulation of dinucleoside polyphosphates [ 24 25 26 27 28 29 30 31 32 33 ] . Recognizing that hnt2 deletion is a pathological condition, we were particular interested in identifying conditions that lead to accumulation of such compounds in cells that contain a functional HNT2 gene, rather than simply identifying conditions that produce diadenosine polyphosphate accumulation in the absence of Hnt2.
An earlier report demonstrated that disruption of HNT2 was tolerated by haploid yeast strains without an effect on growth and that ApppN and AppppN accumulate 30 and 3-fold, respectively on account of the hnt2 deletion [ 13 ] . Because those data were obtained by random spore analysis, we considered it important to test whether elevated dinucleoside polyphosphate levels co-segregate with hnt2 disruption in all tetrads examined and whether any other commonly used genetic markers affect dinucleoside polyphosphate levels.
Disruption of HNT2and tetrad analysis of dinucleoside polyphosphate levels
While cells without a functional HNT2 gene accumulate dinucleoside polyphosphates in excess of 10 μM in a variety of nonstressed and stressed conditions, 46°C heat shock was the only condition that produced dinucleoside polyphosphate accumulation in excess of 10 μM in cells containing a functional HNT2 gene.
To further investigate the kinetics of heat shock and cadmium-induction of ApppN and AppppN levels, we transformed hnt2ΔADE2 strain BY71-6c with multicopy plasmids containing no HNT2 gene, the wild-type HNT2 gene, or the HNT2-His109Ala or HNT2-His109Asp alleles of HNT2 . Cultures were exposed to either 2 mM CdCl 2 or 46°C heat shock and intracellular concentrations of ApppN and AppppN were determined at 30-minute timepoints.
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