Consulta: subjectFacets:"Geographic isolation"
Registros recuperados: 2
Data/hora: 11/06/2024 12:00:55

Inbreeding levels in Northeast Brazil: strategies for the prospecting of new genetic disorders
Provedor de dados: Genetics and Molecular Biology
Autores: Santos,Silvana; Kok,Fernando; Weller,Mathias; Paiva,Francisco Rennan Lopes de; Otto,Paulo A.
A new autosomal recessive genetic condition, the SPOAN syndrome (an acronym for spastic paraplegia, optic atrophy and neuropathy syndrome), was recently discovered in an isolated region of the State of Rio Grande do Norte in Northeast Brazil, in a population that was identified by the IBGE (Brazilian Institute of Geography and Statistics) as belonging to the Brazilian communities with the highest rates of "deficiencies" (Neri, 2003), a term used to describe diseases, malformations, and handicaps in general. This prompted us to conduct a study of consanguinity levels in five of its municipal districts by directly interviewing their inhabitants. Information on 7,639 couples (corresponding to about 40% of the whole population of the studied districts) was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inbreeding levels; Genetic drift; Geographic isolation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200003

Karyotypic diversity between allopatric populations of the group Hoplias malabaricus (Characiformes: Erythrinidae): evolutionary and biogeographic considerations
Provedor de dados: Neotropical Ichthyology
Autores: Blanco,Daniel Rodrigues; Lui,Roberto Laridondo; Bertollo,Luiz Antonio Carlos; Margarido,Vladimir Pavan; Moreira Filho,Orlando.
Three populations of the group Hoplias malabaricus from the hydrographic basins of the São Francisco, Araguaia/Tocantins and Xingu Rivers in Brazil were analyzed using classic cytogenetic methods (Giemsa staining, C-banding and Ag-NORs) and molecular methods (fluorescent in situ hybridization with 18S rDNA, 5S rDNA and 5SHindIII satellite DNA probes). The chromosome markers allowed the characterization of these populations as belonging to karyomorph A and the detection of inter-population divergences. These differences likely stem from different evolutionary histories resulting from geographic isolation between populations associated to the dispersive mode of these organisms, reinforcing genetic diversity in the group Hoplias malabaricus.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetics; Trahira; Karyomorph A; FISH; Geographic isolation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000200015