title: Selection and expression profiles of reference genes in mouse preimplantation embryos of different ploidies at various developmental stages.
abstract: Real-time reverse transcription quantitative polymerase chain reaction (qPCR) has become the most frequently used system for studies of gene expression. Many studies have provided reliable evidence that the transcription levels of reference genes are not constant at different developmental stages and in different experimental conditions. However, suitable reference genes which are stably expressed in polyploid preimplantation embryos of different developmental stages have not yet been identified. Therefore, it is critical to verify candidate reference genes to analyze gene expression accurately in both diploid and polyploid embryos. We examined the expression levels of 12 candidate reference genes in preimplantation embryos of four different ploidies at six developmental stages. Stability analysis of the reference genes was performed by four independent software programs, and the stability of three genes was evaluated by comparison with the Oct4 expression level during preimplantation development in diploid embryos. The expression levels of most genes in the polyploid embryos were higher than that in the diploid embryos, but the increasing degree were disproportionate with the ploidies. There were no significant difference in reference gene expressions among embryos of different ploidies when they reached the morula stage, and the expression level remained flat until the blastocyst stage. Ubc, Ppia, and Pgk1 were the three most stable reference genes in diploid and polyploid embryos.
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Gu
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Xinghui
authors.initials: X
authors.lastname: Shen
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Dongjie
authors.initials: D
authors.lastname: Zhou
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Zhendong
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Na
authors.initials: N
authors.lastname: Zhang
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Zhiyan
authors.initials: Z
authors.lastname: Shan
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Lianhong
authors.initials: L
authors.lastname: Jin
authors.affiliation: Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Lei
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000166:cytology / Q000378:metabolism*; D004622:Embryo, Mammalian; D047108:Embryonic Development / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D020043:Genes, Essential; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D011003:Ploidies; D012015:Reference Standards; D059467:Transcriptome