Abstract:
:B chromosome derivatives suffering from breaks within their centromere were examined cytologically and molecularly. We showed by high resolution FISH that misdivision of the centromere of a univalent chromosome can occur during meiosis. The breaks divide the centromere repeat sequence cluster. A telocentric chromosome formed by misdivision was found to have the addition of telomeric repeats to the broken centromere. A ring chromosome formed after misdivision occurred by fusion of the broken centromere to the telomere. Pulsed-field electrophoresis analyses were performed on the telocentric and ring chromosomes to identify fragments that hybridize to both the telomeric repeat and the B-specific centromeric repeat. We conclude that healing of broken maize centromeres can be achieved through the mechanisms of addition or fusion of telomeric repeat sequences to the broken centromere.
journal_name
Genomejournal_title
Genomeauthors
Kaszás E,Kato A,Birchler JAdoi
10.1139/g02-023subject
Has Abstractpub_date
2002-08-01 00:00:00pages
759-68issue
4eissn
0831-2796issn
1480-3321journal_volume
45pub_type
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