Abstract:
:Recent studies of human oocytes have demonstrated an enrichment for distal exchanges among meiosis I (MI) nondisjunction events and for proximal exchanges among meiosis II (MII) events. Our characterization of 103 cases of spontaneous X chromosome nondisjunction in Drosophila oocytes strongly parallels these observations. The recombinational histories of MI (97/103) and MII (6/103) nondisjunctional ova were strikingly different. MI nondisjunction occurred primarily in oocytes with non-exchange X chromosomes; of the new nondisjoining exchange bivalents, most carried distal crossovers. Thus, spontaneous MI nondisjunction reflects the failure of the achiasmate segregation systems. MII nondisjunction occurred only in oocytes with proximal exchanges. We propose several models to explain how very proximal exchanges might impair proper segregation.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Koehler KE,Boulton CL,Collins HE,French RL,Herman KC,Lacefield SM,Madden LD,Schuetz CD,Hawley RSdoi
10.1038/ng1296-406subject
Has Abstractpub_date
1996-12-01 00:00:00pages
406-14issue
4eissn
1061-4036issn
1546-1718journal_volume
14pub_type
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