期刊
CURRENT BIOLOGY
卷 23, 期 9, 页码 775-781出版社
CELL PRESS
DOI: 10.1016/j.cub.2013.03.040
关键词
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资金
- Narishige Zoological Science Award
- Research Institute of Marine Invertebrates
- Yamada Science Foundation
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- Japanese Association for Marine Biology
- Grants-in-Aid for Scientific Research [21112004, 10J07243, 25440102] Funding Source: KAKEN
Behavioral traits of sperm are adapted to the reproductive strategy that each species employs. In polyandrous species, spermatozoa often form motile clusters, which might be advantageous for competing with sperm from other males [1]. Despite this presumed advantage for reproductive success [2, 3], little is known about how sperm form such functional assemblies. Previously, we reported that males of the coastal squid Loligo bleekeri produce two morphologically different euspermatozoa that are linked to distinctly different mating behaviors [4]. Consort and sneaker males use two distinct insemination sites, one inside and one outside the female's body, respectively. Here, we show that sperm release a self-attracting molecule that causes only sneaker sperm to swarm. We identified CO2 as the sperm chemoattractant and membrane-bound flagellar carbonic anhydrase as its sensor. Downstream signaling results from the generation of extracellular H+, intracellular acidosis, and recovery from acidosis. These signaling events elicit Ca2+-dependent turning behavior, resulting in chemotactic swarming. These results illuminate the bifurcating evolution of sperm underlying the distinct fertilization strategies of this species.
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