Journal
MOLECULAR HUMAN REPRODUCTION
Volume 8, Issue 10, Pages 923-929Publisher
OXFORD UNIV PRESS
DOI: 10.1093/molehr/8.10.923
Keywords
G6PD; HPRT; sex-related growth rate; XIST; ZFX; Y
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The expression of XIST, G6PD, HPRT ZFX and ZFY were investigated in in-vitro produced bovine embryos. Transcripts of these genes were assayed by RT-PCR in pools of pre-compaction stage embryos and sexed pools of morulae and blastocysts. The expression of XIST, G6PD, HPRT and ZFX in female and male morulae and blastocysts were compared using a semi-quantitative RT-PCR. G6PD, HPRT and ZFX transcripts were noted in all pre-compaction stage embryos and in female and male blastocysts. ZFY transcripts were detected in unsexed pools of 8-16-cell stage embryos and in male blastocysts. XIST transcripts were detected in unsexed pools at the 8-16 cell stage, in male and female morulae, and in female blastocysts. The level of XIST RNA was significantly higher in female morulae than in males. Levels of G6PD and HPRT RNA were also higher in female morulae and blastocysts than in males, but only G6PD levels were significantly different between the sexes. The expression of ZFX was also significantly higher in female than in male blastocysts. These results show sexually dimorphic expression of sex chromosome linked genes prior to the blastocyst stage in in-vitro produced bovine embryos.
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