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Title: Evolutionary dynamics of repetitive DNA in Semaprochilodus (characiformes, prochilodontidae): A fish model for sex chromosome differentiation
Authors: Terêncio, Maria Leandra
Schneider, Carlos Henrique
Gross, Maria Claudia
Vicari, Marcelo Ricardo
Farias, Izeni P.
Passos, Kelmer Batalha
Feldberg, Eliana
Keywords: Dna
Microsatellite Dna
Animals Disease
Animals Model
In Situ Hybridization, Fluorescence
Evolution, Molecular
Nucleotide Repeat
Nucleotide Sequence
Sex Chromosome
Sex Differentiation
Base Sequence
Dna Transposable Elements
Evolution, Molecular
In Situ Hybridization, Fluorescence
Microsatellite Repeats
Models, Animals
Repetitive Sequences, Nucleic Acid
Sex Chromosomes
Sex Differentiation
Semaprochilodus Insignis
Semaprochilodus Taeniurus
Issue Date: 2013
metadata.dc.publisher.journal: Sexual Development
metadata.dc.relation.ispartof: Volume 7, Número 6, Pags. 325-333
Abstract: Distribution of 6 microsatellites and 5 transposable elements on the chromosomes of Semaprochilodus taeniurus and S. insignis, commonly referred to as Jaraqui, was performed using their physical mapping with fluorescence in situ hybridization. In this study, we aim to understand the evolutionary dynamics in genomes of S. taeniurus and S. insignis by comparing the position, abundance and contribution of the repetitive sequences in the origins and differentiation of a ZZ/ZW sex chromosome system in S. taeniurus. Results revealed that distribution patterns of repetitive DNAs along the chromosomes varied considerably. Hybridization signals were observed on several autosomes in both species; however, in S. taeniurus genome, the repetitive sequences were more abundant. In addition, large clusters of known repetitive sequences were detected in sex chromosomes of S. taeniurus. This observation is notable because the accumulation of repetitive DNAs could reflect the degradation of genetic activities and the differentiation of protosex chromosomes, evolving into the heteromorphic ZW pair observed in S. taeniurus. © 2013 S. Karger AG, Basel.
metadata.dc.identifier.doi: 10.1159/000356691
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