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Evidence for methylation of inactive human rRNA genes in amplified regions

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Summary

In two unrelated families, the short arm of a 14p+ marker chromosome contains an increased number of copies of the 18S+28S rRNA genes without a comparable increase in the transcriptional activity, as shown by silver staining. The DNA in this region is highly enriched in 5-methylcytosine, as shown by specific antibody binding. In contrast, the owl monkey and cat have a single major nucleolus organizer region (NOR) per haploid genome; these NORs contain about the same number of rRNA genes as the 14p+ chromosome but are not methylated. These findings suggest that most of the amplified human rRNA genes on the 14p+ chromosomes have been inactivated by a process involving DNA methylation.

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Tantravahi, U., Breg, W.R., Wertelecki, V. et al. Evidence for methylation of inactive human rRNA genes in amplified regions. Hum Genet 56, 315–320 (1981). https://doi.org/10.1007/BF00274686

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  • DOI: https://doi.org/10.1007/BF00274686

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