Heterochromatin characterization and distribution in the chromosomes of two populations ofIdotea baltica basteri Audouin, 1826 (Isopoda,Valvifera) |
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| Authors: | G Odierna L G Badalucci S M Guarino C Gambardella M De Nicola |
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| Institution: | (1) Department of Evolutionary and Comparative Biology, Via Mezzocannone 8, I-80134 Naples, (Italy);(2) Department of Genetics, General and Molecular Biology, University of Naples, Via Mezzocannone 8, I-80134 Naples, (Italy);(3) Institute for Biological Exploitation of the Lagoons, C.N.R., Via Pola 4, I-71010 Lesina (FG), (Italy) |
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| Abstract: | Two mediterranean populations ofIdotea baltica basteri from Messina and Naples showed a set of chromosomes composed by 58 all-biarmed chromosomes. The heterochromatin was located in the pericentromeric region of the chromosomes, and its composition appeared heterogeneous. In fact, not all the homologs showed heterochromatin resistant to digestion with three restriction enzymes (Alu I, Hae III and Sau 3A). Moreover, the two populations showed polymorphism in a band of G+C-rich telomeric heterochromatin, which was present only in the population from Messina. It is hypothesized that chromosomal polymorphism might reflect the geographical isolation of the two populations. It is also suggested that a process of diversification is taking place. |
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| Keywords: | Chromosomes crustacea Idotea baltica isopod |
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