Data/hora: 08/06/2024 17:59:28

Provedor de dados: | 74
País: | Brazil
Título: | Thaptomys Thomas 1915 (Rodentia, Sigmodontinae, Akodontini) with karyotypes 2n = 50, FN = 48, and 2n = 52, FN = 52: two monophyletic lineages recovered by molecular phylogeny
Autores: | Ventura,Karen; Silva,Maria José de Jesus; Yonenaga-Yassuda,Yatiyo.
Data: | 2010-01-01
Ano: | 2010
Palavras-chave: | Atlantic Rainforest; Cytochrome b; Endemism; Molecular phylogeny; Thaptomys.
Resumo: | A novel karyotype with 2n = 50, FN = 48, was described for specimens of Thaptomys collected at Una, State of Bahia, Brazil, which are morphologically indistinguishable from Thaptomys nigrita, 2n = 52, FN = 52, found in other localities. It was hence proposed that the 2n = 50 karyotype could belong to a distinct species, cryptic of Thaptomys nigrita, once chromosomal rearrangements observed, along with the geographic distance, might represent a reproductive barrier between both forms. Phylogenetic analyses using maximum parsimony and maximum likelihood based on partial cytochrome b sequences with 1077 bp were performed, attempting to establish the relationships among the individuals with distinct karyotypes along the geographic distribution of the genus; the sample comprised 18 karyotyped specimens of Thaptomys, encompassing 15 haplotypes, from eight different localities of the Atlantic Rainforest. The intra-generic relationships corroborated the distinct diploid numbers, once both phylogenetic reconstructions recovered two monophyletic lineages, a northeastern clade grouping the 2n = 50 and a southeastern clade with three subclades, grouping the 2n = 52 karyotype. The sequence divergence observed between their individuals ranged from 1.9% to 3.5%.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200010
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572010005000053
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.33 n.2 2010
Fonte: | info:eu-repo/semantics/openAccess