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Updated: Jan 24, 2026

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Immunofluorescence Analysis of Endogenous and Exogenous Centromere-kinetochore Proteins

Published on: March 3, 2016

A global view of human centromere variation and evolution.

Shenghan Gao, Keisuke K Oshima, Shu-Cheng Chuang

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.

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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.