In vitro and early in vivo development of sheep gynogenones and putative androgenones
Genomic imprinting, where only one of the two parental genes is expressed, occurs in many phyla. In mammals, however, this phenomenon has been primarily studied in mice, and to a lesser extent, in humans. To understand how genomic imprinting may affect development in other species, particularly thos...
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Published in | Molecular reproduction and development Vol. 50; no. 2; pp. 154 - 162 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
01.06.1998
Wiley-Liss |
Subjects | |
Online Access | Get full text |
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Summary: | Genomic imprinting, where only one of the two parental genes is expressed, occurs in many phyla. In mammals, however, this phenomenon has been primarily studied in mice, and to a lesser extent, in humans. To understand how genomic imprinting may affect development in other species, particularly those with a different mode of placental development from mice and humans, 339 sheep zygotes were micromanipulated to contain either 2 large (presumptive male) or 2 small (presumptive female) pronuclei. One hundred and twenty‐seven of these embryos and 86 manipulated and nonmanipulated control embryos were transferred to recipient ewes over 3 breeding seasons. Twenty‐one control and 7 experimental conceptuses were recovered on day 21. Four of these conceptuses derived from zygotes with 2 small pronuclei were identified by karyotyping to be gynogenones (maternal‐derived genome). While the gross morphology of the embryos appeared no different to those of normal controls, the extra‐embryonic tissue from the conceptuses showed some hypertrophy and hypervascularization. Preliminary Northern blots of mRNA from allantoic and trophoblast tissue showed an overexpression of H19 and an underexpression of IGF2. Although the sheep gynogenetic phenotype contrasts with that seen in mice, these two genes appear to be similarly differentially expressed. Mol. Reprod. Dev. 50:154–162, 1998. © 1998 Wiley‐Liss, Inc. |
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Bibliography: | 1999002136 L10 L53 ArticleID:MRD5 ark:/67375/WNG-324K45KL-J istex:3DF4424A0FDF74EF220809275AE2509C612C4031 New Zealand Foundation for Research, Science, and Technology - No. PGSF Contract C10 402 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 1040-452X 1098-2795 |
DOI: | 10.1002/(SICI)1098-2795(199806)50:2<154::AID-MRD5>3.0.CO;2-J |