Ye, Lihai Zhang, Chun Tang, Xiaojun Chen, Yiyi and Liu, Shaojun 2017. Variations in 5S rDNAs in diploid and tetraploid offspring of red crucian carp × common carp. BMC Genetics, Vol. 18, Issue. 1,
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Huang, Wen Qin, Qinbo Yang, Huirong Li, Shuisheng Hu, Chaoqun Wang, Yude Zhang, Yong Liu, Shaojun and Lin, Haoran 2016. Formation of diploid and triploid hybrid groupers (hybridization of Epinephelus coioides ♀ × Epinephelus lanceolatus ♂) and their 5S gene analysis. BMC Genetics, Vol. 17, Issue. 1,
Castro, Sergio I. Hleap, Jose S. Cárdenas, Heiber and Blouin, Christian 2016. Molecular organization of the 5S rDNA gene type II in elasmobranchs. RNA Biology, Vol. 13, Issue. 4, p. 391.
Cruz, V. P. Oliveira, C. and Foresti, F. 2015. An intriguing model for 5S rDNA sequences dispersion in the genome of freshwater stingray Potamotrygon motoro (Chondrichthyes: Potamotrygonidae). Molecular Biology, Vol. 49, Issue. 3, p. 466.
Veneza, Ivana Felipe, Bruna Oliveira, Joiciane Silva, Raimundo Sampaio, Iracilda Schneider, Horacio and Gomes, Grazielle 2014. A barcode for the authentication of the snappers (Lutjanidae) of the western Atlantic: rDNA 5S or mitochondrial COI?. Food Control, Vol. 38, p. 116.
He, Weiguo Xie, Lihua Li, Tangluo Liu, Shaojun Xiao, Jun Hu, Jie Wang, Jing Qin, Qinbo and Liu, Yun 2013. The formation of diploid and triploid hybrids of female grass carp × male blunt snout bream and their 5S rDNA analysis. BMC Genetics, Vol. 14, Issue. 1, p. 110.
Merlo, Manuel A Cross, Ismael Palazón, José L Úbeda-Manzanaro, María Sarasquete, Carmen and Rebordinos, Laureana 2012. Evidence for 5S rDNA Horizontal Transfer in the toadfish Halobatrachus didactylus (Schneider, 1801) based on the analysis of three multigene families. BMC Evolutionary Biology, Vol. 12, Issue. 1, p. 201.
Ghigliotti, L. Fevolden, S.-E. Cheng, C.-H. C. Babiak, I. Dettai, A. and Pisano, E. 2012. Karyotyping and cytogenetic mapping of Atlantic cod (Gadus morhuaLinnaeus, 1758). Animal Genetics, Vol. 43, Issue. 6, p. 746.
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Campo, Daniel García-Vázquez, Eva and Danzmann, R. 2012. Evolution in the block: common elements of 5S rDNA organization and evolutionary patterns in distant fish genera. Genome, Vol. 55, Issue. 1, p. 33.
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Rodrigues, Débora Rivera, Miryan and Lourenço, Luciana 2012. Molecular organization and chromosomal localization of 5S rDNA in Amazonian Engystomops (Anura, Leiuperidae). BMC Genetics, Vol. 13, Issue. 1, p. 17.
Perina, Alejandra Seoane, David González-Tizón, Ana M Rodríguez-Fariña, Fernanda and Martínez-Lage, Andrés 2011. Molecular organization and phylogenetic analysis of 5S rDNA in crustaceans of the genus Pollicipes reveal birth-and-death evolution and strong purifying selection. BMC Evolutionary Biology, Vol. 11, Issue. 1, p. 304.
Bráullio de Luna Sales, João Fernando da Silva Rodrigues-Filho, Luis Haimovici, Manuel Sampaio, Iracilda and Schneider, Horacio 2011. Molecular differentiation of the species of two squid families (Loliginidae and Ommastrephidae) based on a PCR study of the 5S rDNA gene. Food Control, Vol. 22, Issue. 1, p. 96.
Pinhal, Danillo Yoshimura, Tatiana S Araki, Carlos S and Martins, Cesar 2011. The 5S rDNA family evolves through concerted and birth-and-death evolution in fish genomes: an example from freshwater stingrays. BMC Evolutionary Biology, Vol. 11, Issue. 1,
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Danzmann, Roy Úbeda-Manzanaro, María Merlo, Manuel Alejandro Palazón, José Luis Sarasquete, Carmen and Rebordinos, Laureana 2010. Sequence characterization and phylogenetic analysis of the 5S ribosomal DNA in species of the family Batrachoididae. Genome, Vol. 53, Issue. 9, p. 723.
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Singh, Mamta Kumar, Ravindra Nagpure, N. S. Kushwaha, Basdeo Mani, Indra Chauhan, U. K. and Lakra, W. S. 2009. Population distribution of 45S and 5S rDNA in golden mahseer, Tor putitora: population-specific FISH marker. Journal of Genetics, Vol. 88, Issue. 3, p. 315.
In this study, we attempted a molecular characterization of the 5S rDNA in two closely related species of carcharhiniform sharks, Rhizoprionodon lalandii and Rhizoprionodon porosus, as well as a further comparative analysis of available data on lampreys, several fish groups and other vertebrates. Our data show that Rhizoprionodon sharks carry two 5S rDNA classes in their genomes: a short repeat class (termed class I) composed of ~185 bp repeats, and a large repeat class (termed class II) arrayed in ~465 bp units. These classes were differentiated by several base substitutions in the 5S coding region and by completely distinct non-transcribed spacers (NTS). In class II, both species showed a similar composition for both the gene coding region and the NTS region. In contrast, class I varied extensively both within and between the two shark species. A comparative analysis of 5S rRNA gene sequences of elasmobranchs and other vertebrates showed that class I is closely related to the bony fishes, whereas the class II gene formed a separate cartilaginous clade. The presence of two variant classes of 5S rDNA in sharks likely maintains the tendency for dual ribosomal classes observed in other fish species. The present data regarding the 5S rDNA organization provide insights into the dynamics and evolution of this multigene family in the fish genome, and they may also be useful in clarifying aspects of vertebrate genome evolution.
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