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Journal of Heredity Advance Access originally published online on May 19, 2006
Journal of Heredity 2006 97(3):218-225; doi:10.1093/jhered/esj035
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae

Jeannette Krieger, Anne Kathrin Hett, Paul A. Fuerst, Vadim J. Birstein, and Arne Ludwig

From the Department of Ecology and Evolutionary Biology, Brown University, 80 Waterman Street, Providence, RI 02912 (Krieger); the Department of Evolutionary Genetics, Institute for Zoo and Wildlife Research, PF 601103, 10252 Berlin, Germany (Hett and Ludwig); the Departments of Evolution, Ecology and Organismal Biology and Molecular Genetics, Ohio State University, Columbus, OH 43210 (Fuerst); and Sturgeon Conservation International, 331 West 57th Street, #159, New York, NY 10019 (Birstein)

Address correspondence to J. Krieger at the address above, or e-mail: jkrieg{at}frontiernet.net.

Significant intraindividual variation in the sequence of the 18S rRNA gene is unusual in animal genomes. In a previous study, multiple 18S rRNA gene sequences were observed within individuals of eight species of sturgeon from North America but not in the North American paddlefish, Polyodon spathula, in two species of Polypterus (Polypterus delhezi and Polypterus senegalus), in other primitive fishes (Erpetoichthys calabaricus, Lepisosteus osseus, Amia calva) or in a lungfish (Protopterus sp.). These observations led to the hypothesis that this unusual genetic characteristic arose within the Acipenseriformes after the presumed divergence of the sturgeon and paddlefish families. In the present study, a survey of nearly all Eurasian acipenseriform species was conducted to examine 18S rDNA variation. Intraindividual variation was not found in the polyodontid species, the Chinese paddlefish, Psephurus gladius, but variation was detected in all Eurasian acipenserid species. The comparison of sequences from two major segments of the 18S rRNA gene and identification of sites where insertion/deletion events have occurred are placed in the context of evolutionary relationships within the Acipenseriformes and the evolution of rDNA variation in this group.


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