Occurrence of two cytotypes in Bryconamericus aff. iheringii (Characidae): karyotype analysis by C- and G-banding and replication bands

Cytogenetic analyses of Bryconamericus aff. iheringii specimens from the upper Paraná River basin (State of Paraná, Brazil) are provided. They had 2n = 52 chromosomes and two cytotypes with variations in their karyotypic formulae: cytotype I with 12 metacentric, 18 submetacentric, 8 subtelocentric a...

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Bibliographic Details
Published in:Genetica 2008-06, Vol.133 (2), p.113-118
Main Authors: de Brito Portela-Castro, Ana Luiza, Julio, Horácio Ferreira Jr, dos Santos, Isabel Cristina Martins, Pavanelli, Carla Simone
Format: Article
Language:English
Subjects:
Animal Genetics and Genomics
Animals
Biomedical and Life Sciences
Bromodeoxyuridine - pharmacology
Bryconamericus
Bryconamericus aff. iheringii
Characidae
Chromosome Banding
Chromosome polymorphism
Chromosomes
cytotypes
DNA Replication - physiology
Evolutionary Biology
Female
Fishes - genetics
G-Band
Human Genetics
Karyotypes
Karyotyping
Life Sciences
Male
Metaphase
Microbial Genetics and Genomics
Plant Genetics and Genomics
Polymorphism, Genetic
Replication band
River basins
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Summary:Cytogenetic analyses of Bryconamericus aff. iheringii specimens from the upper Paraná River basin (State of Paraná, Brazil) are provided. They had 2n = 52 chromosomes and two cytotypes with variations in their karyotypic formulae: cytotype I with 12 metacentric, 18 submetacentric, 8 subtelocentric and 14 acrocentric chromosomes with a fundamental number (FN) of 90; cytotype II with 8 metacentric, 28 submetacentric, 6 subtelocentric and 10 acrocentric chromosomes with a fundamental number (FN) of 94. Differences in C- and G-band patterns between the cytotypes, distinguishing marker chromosomes for each karyotype, were reported. The R-band pattern by 5-bromodeoxyuridine incorporation was obtained in chromosomes of the cytotype II sample. In some metaphases, the second pair of submetacentric chromosomes is distinctive: its short arm is heterochromatic (positive C-band), corresponding to a late replication region. In the same cytotype, a G- and R-band size heteromorphism w as recorded in the long arm of pair 9 (submetacentric). These methodologies revealed an actual karyotypic differentiation in the B. aff. iheringii population analyzed. Morphometrical comparative analyses and a discussion of evolutionary aspects of chromosome diversification in species of this genus are provided as well.
ISSN:0016-6707
1573-6857
DOI:10.1007/s10709-007-9188-8