The compaction of chromatin located adjacent to the CENP-A rich centromere 'central core' and characterized by methylation of histone H3K9, into heterochromatin, resulting in the repression of transcription at pericentric DNA. [GOC:mah, PMID:14612388, PMID:20206496, PMID:22729156]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process