Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 32, 507-514, Copyright © 1985 by Society for the Study of Reproduction

ARTICLES

Viability of frozen-thawed mouse embryos is affected by genotype

PM Schmidt, CT Hansen and DE Wildt

Embryos from mice of five different genotypes were evaluated for their ability to survive cryopreservation as measured by post-thaw in vitro development. In Study 1, ovulation was induced with a standardized pregnant mares' serum gonadotropin (PMSG)/human chorionic gonadotropin (hCG) regimen, after which females were mated with males of the same genotype to produce incrossed embryos. Four- to 8-cell embryos were frozen in 1.5 M dimethyl sulfoxide (DMSO) at a rate of 0.5 degrees C/min to -80 degrees C and stored in liquid nitrogen. Following thawing at room temperature, embryos were cultured and development was evaluated 24 h later. The mean (+/- SEM) number of 4- to 8-cell embryos/pregnant female by stock/strain were: N:NIH(S), 6.8 +/- 0.8; N:NIH(S)-B, 5.8 +/- 0.5; N:GP(S), 6.5 +/- 0.6; C57BL/6N, 9.7 +/- 1.0; C3H/HeN MTV-, 9.5 +/- 0.9 (P less than 0.05). Post-thaw in vitro development was related to genetic background; the proportion of embryos culturing after thawing was: N:NIH(S), 49%; N:NIH(S)-B, 61%; N:GP(S), 66%; C57BL/6N, 75%; C3H/HeN MTV-, 56% (P less than 0.05). Study 2 was conducted to evaluate the influence of mating various females to males of a genotype known to have a lower post-thaw embryo survival rate. N:NIH(S)-B, N:GP(S), C57BL/6N, and C3H/HeN MTV- female mice were mated with N:NIH(S) males to produce hybrid embryos. Post- thaw embryo survival was reduced (P less than 0.05) in three of the four hybrid groups. Fresh incrossed and hybrid embryos from each study were cultured for 24 h and yielded culture rates ranging from 95% to 99% (P greater than 0.05) among all groups.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1985 by the Society for the Study of Reproduction.