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Cytogenetics in Arctica islandica (Bivalvia, Arctidae): the Longest Lived Non-Colonial Metazoan

1
Dpto. Bioquímica, Xenética e Inmunoloxía, Universidade de Vigo, E-36310 Vigo, Spain
2
CIMUS Biomedical Research Institute, University of Santiago de Compostela, E-15706 Santiago de Compostela, Spain
*
Author to whom correspondence should be addressed.
Genes 2018, 9(6), 299; https://doi.org/10.3390/genes9060299
Received: 29 May 2018 / Revised: 8 June 2018 / Accepted: 12 June 2018 / Published: 13 June 2018
(This article belongs to the Section Population and Evolutionary Genetics and Genomics)
Due to its extraordinary longevity and wide distribution, the ocean quahog Arctica islandica has become an important species model in both aging and environmental change research. Notwithstanding that, most genetic studies on ocean quahogs have been focused on fishery related, phylogeographic and phylogenetic aspects but nothing is known about their chromosomes. In this work, the chromosomes of the ocean quahog Arctica islandica were analysed by means of 4′,6-diamidino-2-phenylindole (DAPI)/propidium iodide (PI) staining and fluorescent in situ hybridization (FISH) with rDNA, histone gene and telomeric probes. Whilst both 5S rDNA and 45S rDNA were clustered at single subcentromeric locations on the long arms of chromosome pairs 2 and 12, respectively, histone gene clusters located on the short arms of chromosome pairs 7, 10 and 17. As happens with most bivalves, the location of the vertebrate type telomeric sequence clusters was restricted to chromosome ends. The knowledge of the karyotype can facilitate the anchoring of genomic sequences to specific chromosome pairs in this species. View Full-Text
Keywords: ocean quahog; chromosome; fluorescent in situ hybridization; histone genes; ribosomal RNA genes; telomeric sequences ocean quahog; chromosome; fluorescent in situ hybridization; histone genes; ribosomal RNA genes; telomeric sequences
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García-Souto, D.; Pasantes, J.J. Cytogenetics in Arctica islandica (Bivalvia, Arctidae): the Longest Lived Non-Colonial Metazoan. Genes 2018, 9, 299.

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