Comparative cytogenetic analysis of the genus symphysodon (discus fishes, cichlidae): chromosomal characteristics of retrotransposons and minor ribosomal DNA

Cytogenetic and Genome Research
M C GrossE Feldberg

Abstract

As part of a genetic screening program for wild Discus fishes, we analyzed karyotypes and cytogenetic characteristics of Symphysodon aequifasciatus, S. discus and S. haraldi using C-banding and fluorescent in situ hybridization (FISH) with the Rex3 retrotransposon and 5S rDNA probes in mitotic and meiotic chromosomes. In the 3 species, diploid chromosome number was 2n = 60 and karyotypes contained predominantly meta-submetacentric chromosomes. C-banding showed blocks of constitutive heterochromatin mainly in the pericentromeric region. Physical mapping of repetitive 5S rDNA sequences and Rex3 retrotransposons in mitotic and meiotic chromosomes showed partial colocalization of constitutive heterochromatin and repetitive elements. Correlations among the accumulation of repetitive elements, heterochromatinization and chromosome rearrangements have been hypothesized to explain the karyotype differentiation in the Symphysodon genus. The role of repetitive elements in adaptation to highly diverse habitats, as well as in the generation of the phenotypic and genetic variability found in wild Discus populations, needs to be further investigated.

Citations

Oct 6, 2012·BMC Evolutionary Biology·Rafael T NakajimaCesar Martins
Jul 20, 2013·BMC Evolutionary Biology·Carlos Henrique SchneiderEliana Feldberg
Jun 17, 2010·BMC Genetics·Andréia B PolettoCesar Martins
Sep 11, 2012·BMC Genomics·Juliana MazzuchelliCesar Martins
Apr 8, 2014·Genome Génome / Conseil National De Recherches Canada·Tatiane R SampaioAna Lúcia Dias
Dec 12, 2012·Molecular Cytogenetics·Edson Lourenço da SilvaPatrícia Pasquali Parise-Maltempi
Feb 11, 2016·Molecular Genetics and Genomics : MGG·Guilherme ValenteCesar Martins
Mar 25, 2011·Marine Genomics·Maria Alessandra MorescalchiTeresa Capriglione
Aug 4, 2011·International Journal of Evolutionary Biology·Manuella Villar AmadoTomas Hrbek
Mar 17, 2016·Zebrafish·Francijara Araújo da SilvaMaria Claudia Gross
Apr 23, 2010·Journal of Fish Biology·M C GrossE Feldberg
Jan 12, 2016·Comparative Cytogenetics·Carlos Henrique SchneiderEliana Feldberg
Sep 25, 2010·Cellular & Molecular Biology Letters·Hieronim GolczykMarek Szklarczyk
Jan 12, 2016·Comparative Cytogenetics·Maria L TerencioEliana Feldberg
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Sep 19, 2017·Comparative Cytogenetics·Keteryne Rodrigues da SilvaPatricia Pasquali Parise-Maltempi
Oct 1, 2020·Life·Federica CarducciMaria Assunta Biscotti

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