Journal article
Sex-specific differences in meiotic chromosome segregation revealed by dicentric bridge resolution in mice
Genetics (Austin), Vol.162(3), pp.1367-1379
11/2002
Handle:
https://hdl.handle.net/2376/107705
PMCID: PMC1462335
PMID: 12454080
Abstract
The meiotic properties of paracentric inversion heterozygotes have been well studied in insects and plants, but not in mammalian species. In essence, a single meiotic recombination event within the inverted region results in the formation of a dicentric chromatid, which usually breaks or is stretched between the two daughter nuclei during the first meiotic anaphase. Here, we provide evidence that this is not the predominant mode of exchange resolution in female mice. In sharp contrast to previous observations in other organisms, we find that attempts to segregate the dicentric chromatid frequently result not in breakage, stretching, or loss, but instead in precocious separation of the sister centromeres of at least one homolog. This often further results in intact segregation of the dicentric into one of the meiotic products, where it can persist into the first few embryonic divisions. These novel observations point to an unusual mechanism for the processing of dicentric chromosomes in mammalian oogenesis. Furthermore, this mechanism is rare or nonexistent in mammalian spermatogenesis. Thus, our results provide additional evidence of sexual dimorphism in mammalian meiotic chromosome behavior; in "stressful" situations, meiotic sister chromatid cohesion is apparently handled differently in males than in females.
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Details
- Title
- Sex-specific differences in meiotic chromosome segregation revealed by dicentric bridge resolution in mice
- Creators
- Kara E Koehler - Department of Genetics and the Center for Human Genetics, Case Western Reserve University and the University Hospitals of Cleveland, Ohio 44106-4955, USA. kek4@po.cwru.eduElise A MillieJonathan P CherryPaul S BurgoyneEdward P EvansPatricia A HuntTerry J Hassold
- Publication Details
- Genetics (Austin), Vol.162(3), pp.1367-1379
- Academic Unit
- Molecular Biosciences, School of
- Publisher
- United States
- Grant note
- HD37502 / NICHD NIH HHS HD21341 / NICHD NIH HHS
- Identifiers
- 99900547651401842
- Language
- English
- Resource Type
- Journal article