Experimental evidence that changes in oocyte growth influence meiotic chromosome segregation

C.A Hodges; A Ilagan; D Jennings; R Keri; J Nilson; P.A Hunt

doi:10.1093/humrep/17.5.1171

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Experimental evidence that changes in oocyte growth influence meiotic chromosome segregation

Journal article

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Experimental evidence that changes in oocyte growth influence meiotic chromosome segregation

C.A Hodges, A Ilagan, D Jennings, R Keri, J Nilson and P.A Hunt

Human reproduction (Oxford), Vol.17(5), pp.1171-1180

05/2002

DOI: https://doi.org/10.1093/humrep/17.5.1171

Handle:

https://hdl.handle.net/2376/105225

PMID: 11980735

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Abstract

folliculogenesis

non-disjunction

meiosis

age-related aneuploidy

BACKGROUND: It is well known that the fidelity of meiotic chromosome segregation is greatly reduced with increasing maternal age in humans. More recently, direct studies of human oocytes have demonstrated a striking age-related increase in oocytes exhibiting gross disturbances in chromosome alignment on the meiotic spindle. This abnormality, termed congression failure, has been postulated to be causally related to human non-disjunction and to result from subtle alterations in folliculogenesis that develop with advancing reproductive age. METHODS: Immunofluorescence staining, conventional cytogenetic analysis and spectral karyotyping of oocytes from mouse models were used to investigate the hypothesis that changes in the regulation of folliculogenesis induce meiotic defects. RESULTS: Mutations that affect oocyte growth were found to increase the frequency of congression failure at first meiotic metaphase. Importantly, increased congression failure was correlated with meiotic non-disjunction, suggesting a cause-and-effect relationship. CONCLUSIONS: Our findings support the hypothesis that congression failure results from disturbances in the complex interplay of signals regulating folliculogenesis and that these changes subtly alter the late stages of oocyte growth, increasing the risk of a non-disjunction error. These findings have important implications for human aneuploidy, since they suggest that it may be possible to develop prophylactic treatments for reducing the risk of age-related aneuploidy.

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Title: Experimental evidence that changes in oocyte growth influence meiotic chromosome segregation
Creators: C.A Hodges - 1Department of Genetics and
A Ilagan - 1Department of Genetics and
D Jennings - 1Department of Genetics and
R Keri - 1Department of Genetics and
J Nilson - 1Department of Genetics and
P.A Hunt - 1Department of Genetics and
Publication Details: Human reproduction (Oxford), Vol.17(5), pp.1171-1180
Publisher: Oxford University Press
Identifiers: 99900546737501842
Language: English
Resource Type: Journal article