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Genes 2017, 8(12), 370; doi:10.3390/genes8120370

Are Pericentric Inversions Reorganizing Wedge Shell Genomes?

Dpto. Bioquímica, Xenética e Inmunoloxía, Universidade de Vigo, E-36310 Vigo, Spain
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Received: 30 October 2017 / Revised: 30 November 2017 / Accepted: 1 December 2017 / Published: 7 December 2017
(This article belongs to the Section Animal Genetics and Genomics)
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Abstract

Wedge shells belonging to the Donacidae family are the dominant bivalves in exposed beaches in almost all areas of the world. Typically, two or more sympatric species of wedge shells differentially occupy intertidal, sublittoral, and offshore coastal waters in any given locality. A molecular cytogenetic analysis of two sympatric and closely related wedge shell species, Donax trunculus and Donax vittatus, was performed. Results showed that the karyotypes of these two species were both strikingly different and closely alike; whilst metacentric and submetacentric chromosome pairs were the main components of the karyotype of D. trunculus, 10–11 of the 19 chromosome pairs were telocentric in D. vittatus, most likely as a result of different pericentric inversions. GC-rich heterochromatic bands were present in both species. Furthermore, they showed coincidental 45S ribosomal RNA (rRNA), 5S rRNA and H3 histone gene clusters at conserved chromosomal locations, although D. trunculus had an additional 45S rDNA cluster. Intraspecific pericentric inversions were also detected in both D. trunculus and D. vittatus. The close genetic similarity of these two species together with the high degree of conservation of the 45S rRNA, 5S rRNA and H3 histone gene clusters, and GC-rich heterochromatic bands indicate that pericentric inversions contribute to the karyotype divergence in wedge shells. View Full-Text
Keywords: Donax; chromosome; fluorescent in situ hybridization; histone genes; ribosomal RNA genes; GC-rich heterochromatin; pericentric inversions Donax; chromosome; fluorescent in situ hybridization; histone genes; ribosomal RNA genes; GC-rich heterochromatin; pericentric inversions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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García-Souto, D.; Pérez-García, C.; Pasantes, J.J. Are Pericentric Inversions Reorganizing Wedge Shell Genomes? Genes 2017, 8, 370.

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