Abstract:
:Centromeres pose an evolutionary paradox: strongly conserved in function but rapidly changing in sequence and structure. However, in the absence of damage, centromere locations are usually conserved within a species. We report here that isolates of the pathogenic yeast species Candida parapsilosis show within-species polymorphism for the location of centromeres on two of its eight chromosomes. Its old centromeres have an inverted-repeat (IR) structure, whereas its new centromeres have no obvious structural features but are located within 30 kb of the old site. Centromeres can therefore move naturally from one chromosomal site to another, apparently spontaneously and in the absence of any significant changes in DNA sequence. Our observations are consistent with a model in which all centromeres are genetically determined, such as by the presence of short or long IRs or by the ability to form cruciforms. We also find that centromeres have been hotspots for genomic rearrangements in the C. parapsilosis clade.
journal_name
Genome Resjournal_title
Genome researchauthors
Ola M,O'Brien CE,Coughlan AY,Ma Q,Donovan PD,Wolfe KH,Butler Gdoi
10.1101/gr.257816.119subject
Has Abstractpub_date
2020-05-01 00:00:00pages
684-696issue
5eissn
1088-9051issn
1549-5469pii
gr.257816.119journal_volume
30pub_type
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