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Sex chromosome evolution in fish: the formation of the neo-Y chromosome in Eigenmannia (Gymnotiformes)

Almeida-Toledo, L F ; Foresti, F ; Daniel, M F ; Toledo-Filho, S A

Chromosoma, 2000-06, Vol.109 (3), p.197-200 [Periódico revisado por pares]

Austria: Springer Nature B.V

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Título:
Sex chromosome evolution in fish: the formation of the neo-Y chromosome in Eigenmannia (Gymnotiformes)
Autor: Almeida-Toledo, L F ; Foresti, F ; Daniel, M F ; Toledo-Filho, S A
Assuntos: Animals ; Biological Evolution ; chromomycin A3 ; Chromomycin A3 - chemistry ; Chromosomes ; Eigenmannia ; Electric Fish - genetics ; Female ; Gymnotiformes ; Heterochromatin ; Karyotyping ; Male ; Plicamycin - chemistry ; Restriction Mapping ; Sex Chromosomes - genetics ; Sex Differentiation ; Silver Staining - methods ; Translocation, Genetic
É parte de: Chromosoma, 2000-06, Vol.109 (3), p.197-200
Notas: ObjectType-Article-2
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Descrição: Chromosomes of a species of Eigenmannia presenting a X1X1X2X2:X1X2Y sex chromosome system, resulting from a Y-autosome Robertsonian translocation, were analyzed using the C-banding technique, chromomycin A3 (CMA3) and mithramycin (MM) staining and in situ digestion by the restriction endonuclease AluI. A comparison of the metacentric Y chromosome of males with the corresponding acrocentrics in females indicated that a C-band-positive, CMA3/MM-fluorescent and AluI digestion-resistant region had been lost during the process of translocation, resulting in a diminution of heterochromatin in the males. It is hypothesized that the presence of a smaller amount of G + C-rich heterochromatin in the sex chromosomes of the heteromorphic sex when compared with the homomorphic sex may be associated with the sex determination mechanism in this species and may be a more widely occurring phenomenon in fish with differentiated sex chromosomes than was initially thought.
Editor: Austria: Springer Nature B.V
Idioma: Inglês

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Sex chromosome evolution in fish: the formation of the neo-Y chromosome in Eigenmannia (Gymnotiformes)

Almeida-Toledo, L F ; Foresti, F ; Daniel, M F ; Toledo-Filho, S A

Austria: Springer Nature B.V

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