Add parent to GO:0080188 gene silencing by RNA-directed DNA methylation

[pgaudet]

GO:0080188  gene silencing by RNA-directed DNA methylation 

is missing parent 'heterochromatin assembly'

@colinlog @ValWood transcription workshop discussion

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Fix definition " A small RNA-based epigenetic gene silencing process in which small interfering RNAs (siRNAs) guide DNA methylation to the siRNA-generating genomic loci and other loci that are homologous to the siRNAs for de novo DNA methylation. This results in a heterochromatin assembly, a chromatin conformation that is refractory to transcription. In general this process consists of three phases: biogenesis of siRNAs, scaffold RNA production, and the formation of the guiding complex that recruits de novo DNA methyltransferases to the target loci. Transposable elements are silenced by this mechanism."

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• add superclass 'GO:0006346 DNA methylation-dependent heterochromatin assembly'

[pgaudet]

Remove 'GO:0016569 covalent chromatin modification' parent from 'GO:0006346 DNA methylation-dependent heterochromatin assembly' Remove has_part GO:0006306 ! DNA methylation Add: has_part GO:0009008 ! DNA-methyltransferase activity