Factors affecting early embryonic development in cattle:relevance for bovine cloning
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摘要
Female infertility represents a major challenge for improving the production ef?ciency in the dairy industry. Historically, fertility has declined whereas milk yield has increased tremendously due to intensive genetic selection. In vivo evidence reveals about 60% pregnancy loss takes place during the ?rst month following fertilization. Meanwhile, early embryo development is signi?cant for somatic cell nuclear transfer in cattle as a large proportion of cloned embryos fail to develop beyond periimplantation stage. Oocyte quality is of utmost importance for the early embryo to develop to term for both fertilized and cloned embryos. Epigenetic reprogramming is a key process occurring after fertilization and critical roles of epigenetic modi?ers during preimplantation development are now clear. Incomplete epigenetic reprogramming is believed to be a major limitation to cloning ef?ciency.Treatment of cloned embryos with epigenetic modifying drugs(e.g., Trichostatin A) could greatly improve cloning ef?ciency in both mice and cattle. Recently, the rapid progress in high-throughput sequencing technologies has enabled detailed deciphering of the molecular mechanisms underlying these events. The robust ef?ciency of genomic editing tools also presents an alternative approach to the functional annotation of genes critical to early development.
Female infertility represents a major challenge for improving the production ef?ciency in the dairy industry. Historically, fertility has declined whereas milk yield has increased tremendously due to intensive genetic selection. In vivo evidence reveals about 60% pregnancy loss takes place during the ?rst month following fertilization. Meanwhile, early embryo development is signi?cant for somatic cell nuclear transfer in cattle as a large proportion of cloned embryos fail to develop beyond periimplantation stage. Oocyte quality is of utmost importance for the early embryo to develop to term for both fertilized and cloned embryos. Epigenetic reprogramming is a key process occurring after fertilization and critical roles of epigenetic modi?ers during preimplantation development are now clear. Incomplete epigenetic reprogramming is believed to be a major limitation to cloning ef?ciency.Treatment of cloned embryos with epigenetic modifying drugs(e.g., Trichostatin A) could greatly improve cloning ef?ciency in both mice and cattle. Recently, the rapid progress in high-throughput sequencing technologies has enabled detailed deciphering of the molecular mechanisms underlying these events. The robust ef?ciency of genomic editing tools also presents an alternative approach to the functional annotation of genes critical to early development.
Female infertility represents a major challenge for improving the production ef?ciency in the dairy industry. Historically, fertility has declined whereas milk yield has increased tremendously due to intensive genetic selection. In vivo evidence reveals about 60% pregnancy loss takes place during the ?rst month following fertilization. Meanwhile, early embryo development is signi?cant for somatic cell nuclear transfer in cattle as a large proportion of cloned embryos fail to develop beyond periimplantation stage. Oocyte quality is of utmost importance for the early embryo to develop to term for both fertilized and cloned embryos. Epigenetic reprogramming is a key process occurring after fertilization and critical roles of epigenetic modi?ers during preimplantation development are now clear. Incomplete epigenetic reprogramming is believed to be a major limitation to cloning ef?ciency.Treatment of cloned embryos with epigenetic modifying drugs(e.g., Trichostatin A) could greatly improve cloning ef?ciency in both mice and cattle. Recently, the rapid progress in high-throughput sequencing technologies has enabled detailed deciphering of the molecular mechanisms underlying these events. The robust ef?ciency of genomic editing tools also presents an alternative approach to the functional annotation of genes critical to early development.
引文
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