| Epigenetic characteristics of paternal chromatin in interspecies zygotes. | |
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MedLine Citation:
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PMID: 20675961 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Both the sperm and oocyte are terminally differentiated cells, but within a very short post-fertilization period, their genomes are converted into a totipotent zygote. The process of this transformation has been studied in a number of mammals as well as in the pig, for which very inconsistent results have been published. To clarify these inconsistencies, we have used the interspecies intracytoplasmic sperm injection technique for embryo production and subsequent paternal genome remodeling evaluation. First, we injected boar sperm heads into ovulated and in vitro matured mouse oocytes. The boar spermatozoa consistently decondense in ovulated oocytes and form fully developed pronuclei with demethylated DNA (5-methylcytosine; 5-MeC). Additional labeling against other histone modifications (H3/K9 dimethylation, H3/K4 trimethylation) and HP1 (Heterochromatin Protein 1) revealed similarity to those changes that are typical for natural mouse zygotes. On the other hand, no decondensation and formation of male pronuclei were observed, in spite of obvious oocyte activation, in in vitro matured oocytes. For this reason, we have evaluated the reprogramming parameters of in vitro matured mouse oocytes in more detail. In mouse zygotes (intraspecific), both pronuclei were consistently formed, but no sperm head chromatin demethylation was detected after 5-MeC labeling. Our observations suggest that porcine sperm heads are capable of undergoing active demethylation in in vivo matured mouse oocytes. On the other hand, in vitro matured oocytes possess much lower sperm remodeling capabilities. |
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Authors:
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Irena Barnetova; Helena Fulka; Josef Fulka |
Publication Detail:
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Type: Journal Article Date: 2010-07-28 |
Journal Detail:
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Title: The Journal of reproduction and development Volume: 56 ISSN: 0916-8818 ISO Abbreviation: J. Reprod. Dev. Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-01-19 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9438792 Medline TA: J Reprod Dev Country: Japan |
Other Details:
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Languages: eng Pagination: 601-6 Citation Subset: IM |
Affiliation:
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Institute of Animal Science. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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