Variability of chromosome structure in pathogenic fungi--of 'ends and odds'

Current Opinion in Microbiology
Jonathan M Galazka, Michael Freitag

Abstract

Chromatin structure can affect the organization and maintenance of chromosomes. Recent discoveries in several filamentous fungi suggest mechanisms for the clustering and co-regulation of secondary metabolite genes or pathogenicity islands. An extreme case of this may be fungal 'accessory', 'conditionally dispensable', or 'supernumerary' chromosomes that often confer beneficial traits. Fungal supernumerary chromosomes may be derived by similar mechanisms as animal or plant B chromosomes, and we thus propose that this term should be reconsidered to capture the wide variety of fungal accessory chromosomes. In some fungi, both the 'ends' of chromosomes and these 'odd B chromosomes are enriched with a silencing histone modification, H3 lysine 27 trimethylation (H3K27me3), suggesting parallel mechanisms in evolving subtelomeric or B-chromosomal pathogenicity islands and secondary metabolite clusters (SMCs).

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