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      Genetic structure of sigmodontine rodents (Cricetidae) along an altitudinal gradient of the Atlantic Rain Forest in southern Brazil

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          Abstract

          The population genetic structure of two sympatric species of sigmodontine rodents (Oligoryzomys nigripes and Euryoryzomys russatus) was examined for mitochondrial DNA (mtDNA) sequence haplotypes of the control region. Samples were taken from three localities in the Atlantic Rain Forest in southern Brazil, along an altitudinal gradient with different types of habitat. In both species there was no genetic structure throughout their distribution, although levels of genetic variability and gene flow were high.

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          DAPI: a DNA-specific fluorescent probe.

          J Kapuscinski (1995)
          DAPI (4',6-diamidino-2-phenylindole) is a DNA-specific probe which forms a fluorescent complex by attaching in the minor grove of A-T rich sequences of DNA. It also forms nonfluorescent intercalative complexes with double-stranded nucleic acids. The physicochemical properties of the dye and its complexes with nucleic acids and history of the development of this dye as a biological stain are described. The application of DAPI as a DNA-specific probe for flow cytometry, chromosome staining, DNA visualization and quantitation in histochemistry and biochemistry is reviewed. The mechanisms of DAPI-nucleic acid complex formation including minor groove binding, intercalation and condensation are discussed.
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            Phylogeny of Neotropical oryzomyine rodents (Muridae: Sigmodontinae) based on the nuclear IRBP exon.

            Marcelo Weksler (2003)
            Sigmodontine rodents are the most diverse family-level mammalian clade in the Neotropical region, with about 70 genera and 320 recognized species. Partial sequences (1266 bp) from the first exon of the nuclear gene encoding the Interphotoreceptor Retinoid Binding Protein (IRBP) were used to infer the phylogenetic relationships among 44 species representing all 16 currently recognized genera of the largest sigmodontine tribe, the Oryzomyini. Monophyly of the tribe was assessed relative to 15 non-oryzomyine sigmodontine taxa representing all major sigmodontine lineages. Twelve taxa from seven muroid subfamilies were used as outgroups. The resulting matrix included 71 taxa and 386 parsimony-informative characters. Phylogenetic analysis of this matrix resulted in 16 equally parsimonious cladograms, which contained the following well-supported groups: (i). a monophyletic Oryzomyini, (ii). a clade containing all oryzomyines except Scolomys and Zygodontomys, (iii). a clade containing Oecomys, Handleyomys, and several species of forest-dwelling Oryzomys, and (iv). a clade containing the remaining oryzomyine taxa. The last clade is composed of two large subclades, each with lower nodal support, containing the following taxa: (i). Microryzomys, Oligoryzomys, Neacomys, and Oryzomys balneator; (ii). Holochilus, Lundomys, Pseudoryzomys, Nectomys, Amphinectomys, Sigmodontomys, and several species of open-vegetation or semiaquatic Oryzomys. Regarding relationships among non-oryzomyine taxa, sigmodontines, neotomines, and tylomyines do not form a monophyletic group; a clade containing Rheomys and Sigmodon is basal relative to all other sigmodontines; and the remaining sigmodontines are grouped in three clades: the first containing Thomasomyini, Akodontini, and Reithrodon; the second containing Abrothrichini, and Phyllotini, plus Wiedomys, Juliomys, Irenomys, and Delomys; and the third containing the oryzomyines. No conflict is observed between IRBP results and previous robust hypotheses from mitochondrial data, while a single case of incongruence is present between the IRBP topology and robust hypothesis from morphological studies.
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              Small mammals inventories in an easthern brazilian park

              JR STALLINGS, J.R. STALLINGS, Stallings J. R. … (1989)
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                Author and article information

                Contributors
                Gislene L. Gonçalves: Role: ND
                Jorge R. Marinho: Role: ND
                Thales R.O. Freitas: Role: ND
                Journal
                Journal ID (publisher): gmb
                Title: Genetics and Molecular Biology
                Abbreviated Title: Genet. Mol. Biol.
                Publisher: Sociedade Brasileira de Genética (Ribeirão Preto )
                ISSN: 1678-4685
                Publication date (Print): 2009
                Volume: 32
                Issue: 4
                Pages: 882-885
                Affiliations
                [1 ] Universidade Federal do Rio Grande do Sul Brazil
                [2 ] Universidade Federal do Rio Grande do Sul Brazil
                Article
                Publisher ID: S1415-47572009000400034
                SO-VID: 493a98a3-0830-40f4-9deb-a0db3125e74d
                License:

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1415-4757&lng=en
                Categories
                Subject: BIOCHEMISTRY & MOLECULAR BIOLOGY
                Subject: GENETICS & HEREDITY

                ScienceOpen disciplines: Molecular biology,Genetics
                Keywords: Euryoryzomys russatus,gene flow,mismatch distribution,Oligoryzomys nigripes,population expansion
                Data availability:
                ScienceOpen disciplines: Molecular biology, Genetics
                Keywords: Euryoryzomys russatus, gene flow, mismatch distribution, Oligoryzomys nigripes, population expansion

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