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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Cytogenetic and Genome Research; v. 134, n. 4, p. 295-302, 2011.
• Web of Science Citations: 15

Abstract

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)

• FAPESP's process: 09/14881-3 - Chromosomal evolution in the Erythrinidae family: cytogenetic mapping of repetitive DNAs and microdissection of sex chromosomes
• Grantee: Marcelo de Bello Cioffi
• Support Opportunities: Scholarships in Brazil - Doctorate