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J. Biol. Chem., Vol. 276, Issue 30, 27745-27748, July 27, 2001
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§¶,
§,
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,
, and

From the Islet-brain1/JNK-interacting protein-1
(IB1/JIP-1) is a scaffold protein that organizes the JNK, MKK7,
and MLK1 to allow signaling specificity. Targeted disruption of the
gene MAPK8IP1 encoding IB1/JIP-1 in mice led to embryonic
death prior to blastocyst implantation. In culture, no
IB1/JIP-1
Department of Internal Medicine and
Institute of Cellular Biology and Morphology and the
Reproductive Medicine Unit, Department of Obstetrics and
Gynecology, CHUV-University Hospital, 1011 Lausanne and the
** Labortierkunde, University of Zürich, 8057 Zürich,
Switzerland
/
embryos were identified indicating that
accelerated cell death occurred during the first cell cycles. IB1/JIP-1
expression was detected in unfertilized oocytes, in spermatozoa, and in
different stages of embryo development. Thus, despite the maternal and
paternal transmission of the IB1/JIP-1 protein, early transcription of the MAPK8IP1 gene is required for the survival of the
fertilized oocytes.

To whom correspondence should be addressed: Dept. of
Internal Medicine B, CHUV-University Hospital, 1011 Lausanne,
Switzerland. Tel.: 41-21-314-09-60; Fax: 41-21-314-09-68; E-mail:
gwaeber@chuv.hospvd.ch.
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