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PubMed Central
Preprint . 2025
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Independent evolution of holocentric chromosomes in an early branching apicomplexan parasite.

Authors: Kimball, Abigail; Huang, Wanyi; Xu, Rui; Key, Melanie; Funkhouser-Jones, Lisa; Sibley, L. David;

Independent evolution of holocentric chromosomes in an early branching apicomplexan parasite.

Abstract

During its asexual cycle, Cryptosporidium parvum (C. parvum) amplifies through three rounds of nuclear division before undergoing cytokinesis to form infectious merozoites. However, chromosome organization and segregation during nuclear division remain unstudied. Here, we visualized H3-histones, including the centromeric histone H3 (CENH3), telomeres, and centrosomes during mitosis. Nuclear division was accompanied by centriole duplication and elongated microtubules that spanned synchronously dividing nuclei. Surprisingly, C. parvum centromeres detected by CENH3 showed diffuse staining throughout nuclear division, that overlapped with telomeres at the apical nuclear end. Analysis of centromeres based on CENH3 capture and DNA sequencing revealed numerous distinct binding sites scattered across all eight chromosomes, including both coding regions and intergenic regions, that were typified by GA rich repeat sequences. The unique holocentric chromosome structure of C. parvum is unlike the single regional centromeres found in related apicomplexans, suggesting it arose independently from other known examples in plants, insects and worms.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green