Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae
Identifieur interne : 001732 ( Istex/Corpus ); précédent : 001731; suivant : 001733Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae
Auteurs : Jeannette Krieger ; Anne Kathrin Hett ; Paul A. Fuerst ; Vadim J. Birstein ; Arne LudwigSource :
- Journal of Heredity [ 0022-1503 ] ; 2006-05-19.
Abstract
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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DOI: 10.1093/jhered/esj035
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Fuerst</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author><author><name sortKey="Birstein, Vadim J" sort="Birstein, Vadim J" uniqKey="Birstein V" first="Vadim J." last="Birstein">Vadim J. Birstein</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author><author><name sortKey="Ludwig, Arne" sort="Ludwig, Arne" uniqKey="Ludwig A" first="Arne" last="Ludwig">Arne Ludwig</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:DDB665D85D426910C60482FFC16173EED98F51F1</idno><date when="2006" year="2006">2006</date><idno type="doi">10.1093/jhered/esj035</idno><idno type="url">https://api.istex.fr/document/DDB665D85D426910C60482FFC16173EED98F51F1/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001732</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001732</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</title><author><name sortKey="Krieger, Jeannette" sort="Krieger, Jeannette" uniqKey="Krieger J" first="Jeannette" last="Krieger">Jeannette Krieger</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation><affiliation><mods:affiliation>E-mail: jkrieg@frontiernet.net</mods:affiliation></affiliation></author><author><name sortKey="Hett, Anne Kathrin" sort="Hett, Anne Kathrin" uniqKey="Hett A" first="Anne Kathrin" last="Hett">Anne Kathrin Hett</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author><author><name sortKey="Fuerst, Paul A" sort="Fuerst, Paul A" uniqKey="Fuerst P" first="Paul A." last="Fuerst">Paul A. Fuerst</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author><author><name sortKey="Birstein, Vadim J" sort="Birstein, Vadim J" uniqKey="Birstein V" first="Vadim J." last="Birstein">Vadim J. Birstein</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author><author><name sortKey="Ludwig, Arne" sort="Ludwig, Arne" uniqKey="Ludwig A" first="Arne" last="Ludwig">Arne Ludwig</name><affiliation><mods:affiliation>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)</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Heredity</title><idno type="ISSN">0022-1503</idno><idno type="eISSN">1465-7333</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2006-05-19">2006-05-19</date><biblScope unit="volume">97</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="218">218</biblScope><biblScope unit="page" to="225">225</biblScope></imprint><idno type="ISSN">0022-1503</idno></series><idno type="istex">DDB665D85D426910C60482FFC16173EED98F51F1</idno><idno type="DOI">10.1093/jhered/esj035</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1503</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">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.</div></front></TEI><istex><corpusName>oup</corpusName><author><json:item><name>Jeannette Krieger</name><affiliations><json:string>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)</json:string><json:string>E-mail: jkrieg@frontiernet.net</json:string></affiliations></json:item><json:item><name>Anne Kathrin Hett</name><affiliations><json:string>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)</json:string></affiliations></json:item><json:item><name>Paul A. Fuerst</name><affiliations><json:string>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)</json:string></affiliations></json:item><json:item><name>Vadim J. Birstein</name><affiliations><json:string>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)</json:string></affiliations></json:item><json:item><name>Arne Ludwig</name><affiliations><json:string>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)</json:string></affiliations></json:item></author><subject><json:item><value>Articles</value></json:item></subject><language><json:string>unknown</json:string></language><originalGenre><json:string>research-article</json:string></originalGenre><abstract>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.</abstract><qualityIndicators><score>9.141</score><pdfVersion>1.3</pdfVersion><pdfPageSize>594 x 783 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>1</keywordCount><abstractCharCount>1264</abstractCharCount><pdfWordCount>4969</pdfWordCount><pdfCharCount>33930</pdfCharCount><pdfPageCount>8</pdfPageCount><abstractWordCount>181</abstractWordCount></qualityIndicators><title>Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</title><genre><json:string>research-article</json:string></genre><host><volume>97</volume><publisherId><json:string>jhered</json:string></publisherId><pages><last>225</last><first>218</first></pages><issn><json:string>0022-1503</json:string></issn><issue>3</issue><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1465-7333</json:string></eissn><title>Journal of Heredity</title></host><categories><wos><json:string>science</json:string><json:string>genetics & heredity</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>biology</json:string><json:string>evolutionary biology</json:string></scienceMetrix></categories><publicationDate>2006</publicationDate><copyrightDate>2006</copyrightDate><doi><json:string>10.1093/jhered/esj035</json:string></doi><id>DDB665D85D426910C60482FFC16173EED98F51F1</id><score>0.6681169</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/DDB665D85D426910C60482FFC16173EED98F51F1/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/DDB665D85D426910C60482FFC16173EED98F51F1/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/DDB665D85D426910C60482FFC16173EED98F51F1/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a">Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Oxford University Press</publisher><availability><p>The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.</p></availability><date>2006-05-19</date></publicationStmt><notesStmt><note>Corresponding Editor: Rob DeSalle</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a">Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</title><author xml:id="author-1" corresp="yes"><persName><forename type="first">Jeannette</forename><surname>Krieger</surname></persName><email>jkrieg@frontiernet.net</email><affiliation>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)</affiliation></author><author xml:id="author-2"><persName><forename type="first">Anne Kathrin</forename><surname>Hett</surname></persName><affiliation>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)</affiliation></author><author xml:id="author-3"><persName><forename type="first">Paul A.</forename><surname>Fuerst</surname></persName><affiliation>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)</affiliation></author><author xml:id="author-4"><persName><forename type="first">Vadim J.</forename><surname>Birstein</surname></persName><affiliation>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)</affiliation></author><author xml:id="author-5"><persName><forename type="first">Arne</forename><surname>Ludwig</surname></persName><affiliation>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)</affiliation></author></analytic><monogr><title level="j">Journal of Heredity</title><idno type="pISSN">0022-1503</idno><idno type="eISSN">1465-7333</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2006-05-19"></date><biblScope unit="volume">97</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="218">218</biblScope><biblScope unit="page" to="225">225</biblScope></imprint></monogr><idno type="istex">DDB665D85D426910C60482FFC16173EED98F51F1</idno><idno type="DOI">10.1093/jhered/esj035</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2006-05-19</date></creation><abstract><p>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.</p></abstract><textClass><keywords scheme="keyword"><list><item><term>Articles</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2006-05-19">Created</change><change when="2006-05-19">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-12-22">References added</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/DDB665D85D426910C60482FFC16173EED98F51F1/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="corpus oup" wicri:toSee="no header"><istex:docType PUBLIC="-//NLM//DTD Journal Publishing DTD v2.3 20070202//EN" URI="journalpublishing.dtd" name="istex:docType"></istex:docType><istex:document><article article-type="research-article"><front><journal-meta><journal-id journal-id-type="hwp">jhered</journal-id><journal-id journal-id-type="publisher-id">jhered</journal-id><journal-title>Journal of Heredity</journal-title><issn pub-type="epub">1465-7333</issn><issn pub-type="ppub">0022-1503</issn><publisher><publisher-name>Oxford University Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.1093/jhered/esj035</article-id><article-categories><subj-group><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</article-title></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Krieger</surname><given-names>Jeannette</given-names></name></contrib><contrib contrib-type="author"><name><surname>Hett</surname><given-names>Anne Kathrin</given-names></name></contrib><contrib contrib-type="author"><name><surname>Fuerst</surname><given-names>Paul A.</given-names></name></contrib><contrib contrib-type="author"><name><surname>Birstein</surname><given-names>Vadim J.</given-names></name></contrib><contrib contrib-type="author"><name><surname>Ludwig</surname><given-names>Arne</given-names></name></contrib></contrib-group><aff>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)</aff><author-notes><corresp>Address correspondence to J. Krieger at the address above, or e-mail: <email>jkrieg@frontiernet.net</email>.</corresp><fn><p>Corresponding Editor: Rob DeSalle</p></fn></author-notes><pub-date pub-type="epub-ppub"><month>5/6</month><year>2006</year></pub-date><pub-date pub-type="epub"><day>19</day><month>5</month><year>2006</year></pub-date><volume>97</volume><issue>3</issue><fpage>218</fpage><lpage>225</lpage><history><date date-type="received"><day>25</day><month>8</month><year>2005</year></date><date date-type="accepted"><day>5</day><month>11</month><year>2005</year></date></history><copyright-statement>© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.</copyright-statement><abstract><p>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, <italic>Polyodon spathula</italic>, in two species of <italic>Polypterus</italic> (<italic>Polypterus delhezi</italic> and <italic>Polypterus senegalus</italic>), in other primitive fishes (<italic>Erpetoichthys calabaricus, Lepisosteus osseus, Amia calva</italic>) or in a lungfish (<italic>Protopterus</italic> 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, <italic>Psephurus gladius</italic>, 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.</p></abstract></article-meta></front></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Unusual Intraindividual Variation of the Nuclear 18S rRNA Gene is Widespread Within the Acipenseridae</title></titleInfo><name type="personal" displayLabel="corresp"><namePart type="given">Jeannette</namePart><namePart type="family">Krieger</namePart><affiliation>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)</affiliation><affiliation>E-mail: jkrieg@frontiernet.net</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Anne Kathrin</namePart><namePart type="family">Hett</namePart><affiliation>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)</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Paul A.</namePart><namePart type="family">Fuerst</namePart><affiliation>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)</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Vadim J.</namePart><namePart type="family">Birstein</namePart><affiliation>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)</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Arne</namePart><namePart type="family">Ludwig</namePart><affiliation>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)</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="research-article"></genre><subject><topic>Articles</topic></subject><originInfo><publisher>Oxford University Press</publisher><dateIssued encoding="w3cdtf">2006-05-19</dateIssued><dateCreated encoding="w3cdtf">2006-05-19</dateCreated><copyrightDate encoding="w3cdtf">2006</copyrightDate></originInfo><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract>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.</abstract><note type="footnotes">Corresponding Editor: Rob DeSalle</note><relatedItem type="host"><titleInfo><title>Journal of Heredity</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">0022-1503</identifier><identifier type="eISSN">1465-7333</identifier><identifier type="PublisherID">jhered</identifier><identifier type="PublisherID-hwp">jhered</identifier><part><date>2006</date><detail type="volume"><caption>vol.</caption><number>97</number></detail><detail type="issue"><caption>no.</caption><number>3</number></detail><extent unit="pages"><start>218</start><end>225</end></extent></part></relatedItem><identifier type="istex">DDB665D85D426910C60482FFC16173EED98F51F1</identifier><identifier type="DOI">10.1093/jhered/esj035</identifier><accessCondition type="use and reproduction" contentType="copyright">The American Genetic Association. 2006. 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