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Journal of Heredity Advance Access published online on August 26, 2008
Journal of Heredity, doi:10.1093/jhered/esn064
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© The American Genetic Association. 2008. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Brief Communication

The Karyotype of Franciscana Dolphin (Pontoporia blainvillei)

Larissa Heinzelmann, Pedro Cesar Chagastelles, Daniel Danilewicz, José A. B. Chies, and Jaqueline Andrades-Miranda

Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, 91501-970, Brazil (Heinzelmann and Andrades-Miranda), Laboratório de Imunogenética, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 43323, lab. 212, Porto Alegre, RS, 91501-970, Brazil (Heinzelmann, Chagastelles, and Chies), Grupo de Estudos de Mamíferos Aquáticos do Rio Grande do Sul (GEMARS), Rua Felipe Neri, 382/203, Porto Alegre, RS, 90440-150, Brazil (Danilewicz)

Address correspondence to L. Heinzelmann at the address above, or e-mail: lari2512{at}yahoo.com.br.

Despite the recent increase in studies on franciscana dolphin (Pontoporia blainvillei) molecular biology, there has been no published karyotype information, as opportunities for sampling live individuals are very rare. In the present study, the diploid number of the species was established from corneal cell cultures of 2 newborn male franciscanas live stranded (2n = 44). From the comparison of the chromosomal number to the cetacean karyotype phylogeny, we suggest that the most parsimonious hypothesis is that the ancestral character state in the group is the diploid number of 42, with an extra chromosome pair appearing independently twice during cetacean evolution, once in the suborder Odontoceti and once in the suborder Mysticeti. This information on chromosomal number may be useful to future genetic mapping projects of the species.

Key Words: pontoporia blainvillei • karyotype • franciscana • corneal • culture cell • cetacean

Corresponding Editor: Jill Pecon-Slattery

Received January 29, 2008
Accepted July 24, 2008


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