Journal article
Coordinating the segregation of sister chromatids during the first meiotic division: evidence for sexual dimorphism
Journal of cell science, Vol.114(Pt 13), pp.2417-2426
07/2001
Handle:
https://hdl.handle.net/2376/115353
PMID: 11559750
Abstract
Errors during the first meiotic division are common in our species, but virtually all occur during female meiosis. The reason why oogenesis is more error prone than spermatogenesis remains unknown. Normal segregation of homologous chromosomes at the first meiotic division (MI) requires coordinated behavior of the sister chromatids of each homolog. Failure of sister kinetochores to act cooperatively at MI, or precocious sister chromatid segregation (PSCS), has been postulated to be a major contributor to human nondisjunction. To investigate the factors that influence PSCS we utilized the XO mouse, since the chromatids of the single X chromosome frequently segregate at MI, and the propensity for PSCS is influenced by genetic background. Our studies demonstrate that the strain-specific differences in PSCS are due to the actions of an autosomal trans-acting factor or factors. Since components of the synaptonemal complex are thought to play a role in centromere cohesion and kinetochore orientation, we evaluated the behavior of the X chromosome at prophase to determine if this factor influenced the propensity of the chromosome for self-synapsis. We were unable to directly correlate synaptic differences with subsequent segregation behavior. However, unexpectedly, we uncovered a sexual dimorphism that may partially explain sex-specific differences in the fidelity of meiotic chromosome segregation. Specifically, in the male remnants of the synaptonemal complex remain associated with the centromeres until anaphase of the second meiotic division (MII), whereas in the female, all traces of synaptonemal complex (SC) protein components are lost from the chromosomes before the onset of the first meiotic division. This finding suggests a sex-specific difference in the components used to correctly segregate chromosomes during meiosis, and may provide a reason for the high error frequency during female meiosis.
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Details
- Title
- Coordinating the segregation of sister chromatids during the first meiotic division: evidence for sexual dimorphism
- Creators
- C A Hodges - Department of Genetics and Center for Human Genetics, Case Western Reserve University and University Hospitals of Cleveland, Cleveland, Ohio 44106-4955, USAR LeMaire-AdkinsP A Hunt
- Publication Details
- Journal of cell science, Vol.114(Pt 13), pp.2417-2426
- Publisher
- England
- Grant note
- R01 HD31866 / NICHD NIH HHS
- Identifiers
- 99900548280901842
- Language
- English
- Resource Type
- Journal article