Meiotic Transmission Rates Correlate With Physical Features of Rearranged Centromeres in Maize

Corresponding author: James A. Birchler, Division of Biological Sciences, University of Missouri, Columbia, MO 65211-7400., birchler{at}biosci.mbp.missouri.edu (E-mail).

Communicating editor: W. F. SHERIDAN

The centromere of the maize B chromosome was used as a model to study the physical features of a functional centromere. Pulsed-field gel electrophoresis was previously used to determine the organization of a repetitive sequence (referred to as the B-specific repeat) localized in the centromeric region of the maize B chromosome. The centromere is composed mostly of this repeat. In this report, a collection of 25 B chromosome derivatives that suffered from misdivision of the centromere was examined for the content and organization of the B repeat. Meiotic transmission of these derivatives was also determined and compared with rearrangements within the centromere. This analysis revealed that there is a strong correlation between the size of the centromere and meiotic transmission. In addition, the loss of a particular PmeI fragment of 370 kb considerably reduced meiotic transmission. This sequence contains a 55-kb EcoRI fragment that is also present in all but four derivatives. Because the centromere of the maize B chromosome can be divided by successive misdivisions to derivatives with centromeres of <300 kb, it should be possible for artificial chromosomes to be produced in maize.

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