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Increased competitiveness of nematode sperm bearing the male X chromosome.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lamunyon, C. W. Ward, S.
Description	Author Affiliation: LaMunyon CW ( Department of Molecular and Cellular Biology, University of Arizona, Tucson 85721, USA. cwl@u.arizona.edu);
Abstract	Male offspring, which cannot reproduce independently, represent a cost of sexual reproduction. This cost is eliminated by the production of hermaphroditic offspring in the self-fertilizing nematode Caenorhabditis briggsae. However, these hermaphrodites can outcross by mating with males. Half the sperm received from males contain no sex chromosome and therefore give rise to male progeny. Mating with males should thus impose the cost of making male offspring. We found that male sperm took immediate precedence over hermaphrodite sperm, resulting in maximized outcrossing, but the appearance of male progeny was delayed after mating. This delay is caused by the male X-bearing sperm outcompeting their nullo-X counterparts. The competitive advantage of X-bearing sperm over nullo-X sperm is limited to sperm from males; it did not occur in a mutant hermaphrodite that produces both types of sperm. The chromosomal effect on sperm competitiveness in C. briggsae, which has not been observed in other species, suggests that the X chromosome has evolved a form of meiotic drive, selfishly increasing the competitiveness of sperm that bear it over those that do not. Thus, the multiple levels of sperm competitiveness found in C. briggsae maximize outcrossing after mating while delaying the cost of making male offspring.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	1
Volume Number	94
Language	English
Publisher	National Academy of Sciences
Publisher Date	1997-02-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Caenorhabditis Physiology Spermatozoa X Chromosome Animals Disorders Of Sex Development Fertilization Reproduction Sex Differentiation Spermatogenesis Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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