Mouse embryos generated from frozen-thawed oocytes can successfully survive a second cryopreservation

Ariel Revel*, Naama Moshe, Aharon Helman, Anat Safran, Alex Simon, Moriah Koler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background: To determine whether mouse embryos generated from frozen-thawed oocytes can successfully survive a second cryopreservation. Methods: Immature C57BL6*BALB/c female mice underwent superovulation and the collected oocytes were divided into three groups. Group A oocytes (n = 107) underwent IVF. Group B oocytes (n = 167) underwent IVF and embryos generated were then cryopreserved. Group C oocytes (n = 94) were cryopreserved, thawed and underwent IVF. Two-four-cell stage embryos were re-cryopreserved and thawed. Embryos from all groups were then cultured to the blastocyst stage. Results: Cleavage rates to the 2-4-cell stage were 78, 71 and 46% for groups A, B and C respectively. Blastulation rates from 2-4 cell-stage embryos were 37/83 (45%), 27/118 (23%) and 8/35 (23%) for groups A, B and C respectively. Development to blastocysts was observed in 37/107 oocytes (35%), 27/167 oocytes (16%) and only 8/94 oocytes (9%) for groups A, B and C respectively. Conclusion: Oocyte cryopreservation results in reduced fertilization rates. Embryo cryopreservation reduces blastulation rates by half regardless of whether the oocytes were fertilized fresh or frozen-thawed. Nevertheless, embryos generated from cryopreserved oocytes can survive cryopreservation and develop to the blastocyst stage at rates comparable with embryos obtained from fresh oocytes.

Original languageEnglish
Pages (from-to)666-669
Number of pages4
JournalHuman Reproduction
Volume19
Issue number3
DOIs
StatePublished - Mar 2004
Externally publishedYes

Keywords

  • Blastocyst
  • Cryopreservation
  • IVF
  • Mouse
  • Oocyte

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