abnormal chromatin silencing abnormal chromatin silencing at rDNA FYPO:0000206 midori abnormal chromatin silencing at rDNA during mitotic cell cycle A transcription regulation phenotype observed in the vegetative growth phase of the life cycle in which chromatin silencing at ribosomal DNA repeats is abnormal. Chromatin silencing is the observed effect of processes that repress transcription in a region of the genome that is normally assembled into heterochromatin. abnormal chromatin silencing at rDNA during vegetative growth abnormal chromatin silencing at ribosomal DNA 2011-04-13T03:41:10Z Chromatin silencing phenotypes may reflect the assembly or maintenance of heterochromatin. See the GO cellular component term 'heterochromatin' (GO:0000792), and the biological process term 'heterochromatin organization' (GO:0070828).