Spontaneous X chromosome MI and MII nondisjunction events in Drosophila melanogaster oocytes have different recombinational histories

被引：117

作者：

Koehler, KE ^{[1
]}

Boulton, CL ^{[1
]}

Collins, HE ^{[1
]}

French, RL ^{[1
]}

Herman, KC ^{[1
]}

Lacefield, SM ^{[1
]}

Madden, LD ^{[1
]}

Schuetz, CD ^{[1
]}

Hawley, RS ^{[1
]}

机构：

[1] UNIV CALIF DAVIS,DEPT GENET,SECT MOL & CELLULAR BIOL,DAVIS,CA 95616

来源：

NATURE GENETICS | 1996年 / 14卷 / 04期

关键词：

D O I：

10.1038/ng1296-406

中图分类号：

Q3 [遗传学];

学科分类号：

071007 ; 090102 ;

摘要：

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 few 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.

引用

页码：406 / 414

页数：9

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