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A Sperm Cytoskeletal Protein That Signals Oocyte Meiotic Maturation and Ovulation
Michael A. Miller,1Viet Q. Nguyen,2Min-Ho Lee,3Mary Kosinski,1Tim Schedl,3Richard M. Caprioli,2David Greenstein1*
Caenorhabditis elegans oocytes, like those of
most animals, arrest during meiotic prophase. Sperm promote the
resumption ofmeiosis (maturation) and contraction of smooth
muscle-like gonadalsheath cells, which are required for ovulation. We
show that themajor sperm cytoskeletal protein (MSP) is a bipartite
signal foroocyte maturation and sheath contraction. MSP also functions
insperm locomotion, playing a role analogous to actin. Thus, duringevolution, MSP has acquired extracellular signaling and intracellularcytoskeletal functions for reproduction. Proteins with MSP-likedomains
are found in plants, fungi, and other animals, suggestingthat related
signaling functions may exist in other phyla.
1 Department of Cell Biology,
2 Mass Spectrometry Research Center, Vanderbilt
University School of Medicine, Nashville, TN 37232, USA.
3 Department of Genetics, Washington University
School of Medicine, St. Louis, MO 63110, USA.
*
To whom correspondence should be addressed. E-mail:
david.greenstein{at}mcmail.vanderbilt.edu
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In Science Magazine
PERSPECTIVES
Anne M. Villeneuve (16 March 2001) Science291 (5511), 2099.
[DOI: 10.1126/science.1060125] |Summary »|Full Text »
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