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Analysis of the chromosome complement of frozen‐thawed mouse oocytes after parthenogenetic activation
Author(s) -
BosMikich A.,
Whittingham D. G.
Publication year - 1995
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.1080420215
Subject(s) - biology , andrology , oocyte , aneuploidy , cryopreservation , parthenogenesis , ploidy , embryo , polar body , oocyte cryopreservation , chromosome , meiosis , genetics , population , medicine , fertility , demography , sociology , gene , fertility preservation
Frozen‐thawed mouse oocytes were artificially activated with Sr 2+ and analyzed cytogenetically at the first cleavage division to examine the behavior of the maternal chromosomes independently of the paternal complement. There was no significant difference in the rate of activation between frozen‐thawed and freshly collected oocytes and the majority of oocytes (>90%) had a normal haploid chromosome constitution. The incidence of second polar body retention in frozenthawed oocytes was low and did not differ significantly from that observed in fresh oocytes and oocytes exposed to dimethylsulfoxide (DMSO) at 0°C or 37°C for extended periods beyond those required for protection. The frequency of aneuploidy was similar for frozen‐thawed and fresh oocytes but oocytes held at 0°C without DMSO or held at 37°C with DMSO for 1 hr showed a 2.5 and 12‐fold increase in the frequency of aneuploidy compared with oocytes subjected to a conventional oocyte/embryo freezing regime. It is concluded that the procedures used in successful oocyte cryopreservation do not increase the incidence of chromosomal abnormalities of maternal origin in the resulting embryos. © 1995 wiley‐Liss, Inc.