Abstract:
:Errors in meiotic chromosome segregation are the leading cause of spontaneous abortions and birth defects. In humans, chromosomes that fail to experience crossovers (or exchanges) are error-prone, more likely than exchange chromosomes to mis-segregate in meiosis. We used a yeast model to investigate the mechanisms that partition nonexchange chromosomes. These studies showed that the spindle checkpoint genes MAD1, MAD2 and MAD3 have different roles. We identified a new meiotic role for MAD3; though dispensable for the segregation of exchange chromosomes, it is essential for the segregation of nonexchange chromosomes. This function of Mad3p could also be carried out by human BubR1. MAD1 and MAD2 act in a surveillance mechanism that mediates a metaphase delay in response to nonexchange chromosomes, whereas MAD3 acts as a crucial meiotic timer, mediating a prophase delay in every meiosis. These findings suggest plausible models for the basis of errant meiotic segregation in humans.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Cheslock PS,Kemp BJ,Boumil RM,Dawson DSdoi
10.1038/ng1588keywords:
subject
Has Abstractpub_date
2005-07-01 00:00:00pages
756-60issue
7eissn
1061-4036issn
1546-1718pii
ng1588journal_volume
37pub_type
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