Chromosomal Distribution of Repetitive DNA Sequences Highlights the Independent Differentiation of Multiple Sex Chromosomes in Two Closely Related Fish Species

Autor(es)

Cioffi, M. B. ^[1] ; Molina, W. F. ^[2] ; Moreira-Filho, O. ^[1] ; Bertollo, L. A. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Genet & Evolucao, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Rio Grande do Norte, Ctr Biociencias, Dept Biol Celular & Genet, BR-59072970 Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Cytogenetic and Genome Research; v. 134, n. 4, p. 295-302, 2011.
• Citações Web of Science: 15
• Assunto(s): Citogenética molecular Erythrinidae Cromossomos sexuais

Resumo

The arrangement of 6 repetitive DNA sequences in the mitotic and meiotic sex chromosomes of 2 Erythrinidae fish, namely Hoplias malabaricus and Erythrinus erythrinus, both with a multiple X(1)X(1)X(2)X(2)/X(1)X(2)Y sex chromosome system, was analyzed using fluorescence in situ hybridization. The distribution patterns of the repetitive sequences were distinct for each species. While some DNA repeats were species-specific, others were present in the sex chromosomes of both species at different locations. These data, together with the different morphological types of sex chromosomes and the distinct chromosomal rearrangements associated with the formation of the neo-Y chromosomes, support the plasticity of sex chromosome differentiation in the Erythrinidae family. Our present data highlight that the sex chromosomes in fish species may follow diverse differentiation patterns, even in the same type of sex chromosome system present in cofamiliar species. Copyright (C) 2011 S. Karger AG, Basel (AU)

• Processo FAPESP: 09/14881-3 - Evolução cromossômica na família Erythrinidae: mapeamento citogenético de DNAs repetitivos e microdissecção de cromossomos sexuais
• Beneficiário: Marcelo de Bello Cioffi
• Modalidade de apoio: Bolsas no Brasil - Doutorado