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- W2076338997 abstract "Removal of the micronuclei of Paramecium tetraurelia and Paramecium jenningsi by micropipetting generates amicronucleate cell lines. These cell lines go through a period of growth depression for several dozen fissions, but they gradually recover. Amicronucleate cells in the depression period characteristically exhibit abnormal oral development, particularly reduction in the length of the buccal cavity and an abnormal pattern of the oral membranelles. To test the notion that the macronucleus is involved in the recovery of amicronucleate cell lines, DNA demethylation drugs were administered to amicronucleates in the depression period. After at least 4 fissions, the treated amicronucleates were assessed for their progress in recovery by scoring the proportion of cells with normal oral membranelles. Cvtidine analogues which demethylate cytosine specifically at the 5 position, namely 5-azacytidine, 5-aza-2′- deoxycytidine and 5-fluoro-2′-deoxycytidine. promoted recovery of the amicronucleates. Cytidine, 6-azacytidine, 2′-fluoro-2′-deoxy-cytidine and cytosine-β-D-arabinofuranoside did not. These results suggest that (i) 5-methylcytosine is present in the macronucleus of these Paramecium species, probably in small amounts and (ii) recovery of amicronucleates involves demethylation of macronuclear DNA. This implies that in normal cells the micronuclei are involved in maintaining the macronuclear DNA in a methylated state and hence the inactivation of the macronuclear sequences that are to be employed for stomatogenic recovery. A general mechanism for the control of gene expression may therefore be employed for the regulation of specific sequences." @default.
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- W2076338997 date "1989-01-01" @default.
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- W2076338997 title "Cytidine Analogues and Stomatogenic Recovery in Amicronucleate<i>Paramecium tetraurelia</i>and<i>Paramecium jenningsi</i>" @default.
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- W2076338997 doi "https://doi.org/10.1111/j.1550-7408.1989.tb02710.x" @default.
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