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First description of B chromosomes in the Hyphessobrycon (Characiformes, Characidae) genus: a hypothesis for the extra element of Hyphessobryconeques Steindachner, 1882.

Piscor D, Parise-Maltempi PP - Comp Cytogenet (2015)

Bottom Line: Only two females showed one B chromosome.The heterochromatin was observed mainly on centromeric regions, and in the long arm of the B chromosome.In this paper, the relationship of the B chromosome of Hyphessobryconeques with an occasional chromosome rearrangement was discussed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Instituto de Biociências, Departamento de Biologia, Laboratório de Citogenética, Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Av. 24A, 1515, CEP: 13506-900, Rio Claro, SP, Brazil.

ABSTRACT
The Hyphessobrycon are allocated in the incertae sedis group of the Characidae family, one of the genera with more species of the group. The chromosomes of some species of Hyphessobrycon are known, and the diploid number most common for genus is 2n = 50 chromosomes. The aims of this study were to examine the karyotype macrostructure in the Hyphessobryconeques Steindachner, 1882, and show a new origin hypothesis for B chromosomes. The diploid number observed for Hyphessobryconeques was 2n = 52 chromosomes, and a karyotype formulae of 12m + 18sm + 8st + 14a, with FN (fundamental number) = 90 for both sexes. Only two females showed one B chromosome. The heterochromatin was observed mainly on centromeric regions, and in the long arm of the B chromosome. In this paper, the relationship of the B chromosome of Hyphessobryconeques with an occasional chromosome rearrangement was discussed.

No MeSH data available.


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Scheme showing a possible origin of the B chromosome in Hyphessobryconeques. A Pair 19 not fissioned B The short arm of one homologous underwent fission and inversion C One homologous of pair 19 without the secondary constriction and a B chromosome formed.
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Figure 3: Scheme showing a possible origin of the B chromosome in Hyphessobryconeques. A Pair 19 not fissioned B The short arm of one homologous underwent fission and inversion C One homologous of pair 19 without the secondary constriction and a B chromosome formed.

Mentions: A summary diagram indicating a possible origin mechanism of the B chromosome in Hyphessobryconeques by heterochromatin blocks is shown in Figure 3.


First description of B chromosomes in the Hyphessobrycon (Characiformes, Characidae) genus: a hypothesis for the extra element of Hyphessobryconeques Steindachner, 1882.

Piscor D, Parise-Maltempi PP - Comp Cytogenet (2015)

Scheme showing a possible origin of the B chromosome in Hyphessobryconeques. A Pair 19 not fissioned B The short arm of one homologous underwent fission and inversion C One homologous of pair 19 without the secondary constriction and a B chromosome formed.
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4547033&req=5

Figure 3: Scheme showing a possible origin of the B chromosome in Hyphessobryconeques. A Pair 19 not fissioned B The short arm of one homologous underwent fission and inversion C One homologous of pair 19 without the secondary constriction and a B chromosome formed.
Mentions: A summary diagram indicating a possible origin mechanism of the B chromosome in Hyphessobryconeques by heterochromatin blocks is shown in Figure 3.

Bottom Line: Only two females showed one B chromosome.The heterochromatin was observed mainly on centromeric regions, and in the long arm of the B chromosome.In this paper, the relationship of the B chromosome of Hyphessobryconeques with an occasional chromosome rearrangement was discussed.

View Article: PubMed Central - HTML - PubMed

Affiliation: Instituto de Biociências, Departamento de Biologia, Laboratório de Citogenética, Universidade Estadual Paulista "Júlio de Mesquita Filho" (UNESP), Av. 24A, 1515, CEP: 13506-900, Rio Claro, SP, Brazil.

ABSTRACT
The Hyphessobrycon are allocated in the incertae sedis group of the Characidae family, one of the genera with more species of the group. The chromosomes of some species of Hyphessobrycon are known, and the diploid number most common for genus is 2n = 50 chromosomes. The aims of this study were to examine the karyotype macrostructure in the Hyphessobryconeques Steindachner, 1882, and show a new origin hypothesis for B chromosomes. The diploid number observed for Hyphessobryconeques was 2n = 52 chromosomes, and a karyotype formulae of 12m + 18sm + 8st + 14a, with FN (fundamental number) = 90 for both sexes. Only two females showed one B chromosome. The heterochromatin was observed mainly on centromeric regions, and in the long arm of the B chromosome. In this paper, the relationship of the B chromosome of Hyphessobryconeques with an occasional chromosome rearrangement was discussed.

No MeSH data available.


Related in: MedlinePlus