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Updated: Jan 24, 2026
05:35
Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins
Published on: March 3, 2016
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A global view of human centromere variation and evolution.
Biorxiv : the Preprint Server for Biology
|January 23, 2026
Summary
Researchers assembled and characterized 2,110 complete human centromeres, revealing novel variations and insights into their evolution. This study uncovers extensive centromere diversity and provides a new model for centromere evolution, essential for chromosome segregation.
Area of Science:
- Genetics
- Molecular Biology
- Evolutionary Biology
Background:
- Centromeres are crucial for accurate chromosome segregation during cell division.
- Highly repetitive centromeric sequences have historically limited their complete assembly and characterization.
- Understanding centromere diversity across populations and evolution is largely unexplored.
Purpose of the Study:
- To assemble and characterize a comprehensive set of human centromeres from a diverse cohort.
- To uncover novel variations within centromeres and identify new centromere haplotypes and alpha-satellite higher-order repeat (HOR) variants.
- To investigate the evolutionary dynamics and sequence-structure relationships of human centromeres.
Main Methods:
- Assembly and characterization of 2,110 complete human centromeres from a diverse cohort.
- Development of novel bioinformatic tools tailored for repetitive centromeric regions.
- Utilized long-read CENP-A CUT&RUN, DiMeLo-seq, and multi-generational inheritance studies for validation.
Main Results:
- Identified 226 novel centromere haplotypes and 1,870 new alpha-satellite HOR variants.
- Discovered mobile element insertions in 30% of centromeres, with specific enrichment on chromosome 16.
- Characterized variations in kinetochore site number (di- and tri-kinetochores) and confirmed their association with centromere sequence and structure.
- Observed >50-fold variation in centromere mutation rates, with evidence of archaic hominin introgression.
- Validated rapid mutation rates at the kinetochore site in a four-generation family study.
Conclusions:
- Human centromeres exhibit significant sequence and structural diversity previously hidden by repetitive regions.
- Centromere evolution is shaped by an 'arms race' between sequence and protein factors, particularly at the kinetochore site.
- This work provides a foundation for understanding centromere variation, its impact on chromosome segregation, and its role in human evolution.
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