DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles

Trapphoff T, El Hajj N, Zechner U, Haaf T, Eichenlaub-Ritter U (2010)
Human Reproduction 25(12): 3025-3042.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Trapphoff, Tom; El Hajj, Nady; Zechner, Ulrich; Haaf, Thomas; Eichenlaub-Ritter, UrsulaUniBi
Abstract / Bemerkung
Cryopreservation of follicles for culture and oocyte growth and maturation in vitro provides an option to increase the number of fertilizable oocytes and restore fertility in cases where transplantation of ovarian tissue poses a risk for malignant cell contamination. Vitrification for cryopreservation is fast and avoids ice crystal formation. However, the influences of exposure to high concentrations of cryoprotectants on follicle development, oocyte growth and maturation, and particularly, on the DNA integrity and methylation imprinting has not been studied systematically. Follicle survival and development, DNA damage, oocyte growth patterns, maturation, spindle formation and chromosomal constitution were studied after Cryo-Top vitrification of mouse pre-antral follicles cultured to the antral stage and induced to ovulate in vitro. Methylation of differentially methylated regions (DMRs) of two maternally (Snrpn and Igf2r) and one paternally (H19) imprinted genes was studied by bisulfite pyrosequencing. Vitrification results in partial or total loss of oocyte-granulosa cell apposition and actin-rich transzonal projections, a transient increase in DNA breaks and a delay in follicle development. However, the oocyte growth pattern, maturation, spindle and chromosomal constitution are not significantly different between the vitrified and the control groups. Vitrification is not associated with elevated levels of imprinting mutations (aberrant methylation of the entire DMR), although the distribution of sporadic CpG methylation errors in the Snrpn DMR appears to differ slightly between control and vitrified oocytes. DNA breaks appear to be rapidly repaired and vitrification of oocytes inside pre-antral follicles by the Cryo-Top method does not appear to increase risks of abnormal imprinting or disturbances in spindle formation and chromosome segregation.
oocyte maturation; aneuploidy; cryopreseration; imprinting; DNA damage
Human Reproduction
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Trapphoff T, El Hajj N, Zechner U, Haaf T, Eichenlaub-Ritter U. DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles. Human Reproduction. 2010;25(12):3025-3042.
Trapphoff, T., El Hajj, N., Zechner, U., Haaf, T., & Eichenlaub-Ritter, U. (2010). DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles. Human Reproduction, 25(12), 3025-3042. https://doi.org/10.1093/humrep/deq278
Trapphoff, Tom, El Hajj, Nady, Zechner, Ulrich, Haaf, Thomas, and Eichenlaub-Ritter, Ursula. 2010. “DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles”. Human Reproduction 25 (12): 3025-3042.
Trapphoff, T., El Hajj, N., Zechner, U., Haaf, T., and Eichenlaub-Ritter, U. (2010). DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles. Human Reproduction 25, 3025-3042.
Trapphoff, T., et al., 2010. DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles. Human Reproduction, 25(12), p 3025-3042.
T. Trapphoff, et al., “DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles”, Human Reproduction, vol. 25, 2010, pp. 3025-3042.
Trapphoff, T., El Hajj, N., Zechner, U., Haaf, T., Eichenlaub-Ritter, U.: DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles. Human Reproduction. 25, 3025-3042 (2010).
Trapphoff, Tom, El Hajj, Nady, Zechner, Ulrich, Haaf, Thomas, and Eichenlaub-Ritter, Ursula. “DNA integrity, growth pattern, spindle formation, chromosomal constitution and imprinting patterns of mouse oocytes from vitrified pre-antral follicles”. Human Reproduction 25.12 (2010): 3025-3042.

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