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Misdivision analysis of centromere structure in maize

E Kaszás¹, J A Birchler

¹Division of Biological Sciences, University of Missouri, Columbia 65211, USA.

The EMBO Journal

|October 1, 1996

Summary

Plant centromere organization was studied using B chromosome repeats. Results show these repeats are integral to functional centromeres, adaptable in copy number without losing function.

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Area of Science:

Plant genetics
Molecular biology
Chromosomal organization

Background:

Centromeres are crucial for chromosome segregation during cell division.
The structure and composition of plant centromeres, particularly those on B chromosomes, are not fully understood.

Purpose of the Study:

To investigate the size and organization of a plant centromere from a supernumerary B chromosome.
To analyze the role of a specific repeated sequence (B repeat) in the functional centromere.

Main Methods:

Utilized a repeated sequence specific to the centric region of the B chromosome.
Analyzed derivatives of the B chromosome that underwent centromere misdivision.
Assessed the content and organization of the B repeat in these derivatives.

Main Results:

Major rearrangements were detected in B chromosome derivatives after misdivision.
Some misdivisions led to a significant reduction in the size of the B-specific repeat cluster.
The B repeat was found to be spread throughout the functional centromere.

Conclusions:

The B repeat is a fundamental component of the functional plant centromere.
Plant centromeres are composed of repeat units whose copy number can vary significantly without affecting centromere function.
Centromere structure is adaptable, even with substantial changes in repeat copy number.

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