Homologous Transposition
Mostrando 1-12 de 137 artigos, teses e dissertações.
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1. Cytogenetic analysis of Astyanax laticeps (Cope, 1894) (Ostariophysi: Characidae) from the laguna dos Patos system
O gênero Astyanax é destacado entre os Characiformes, pelo grande número de espécies encontradas e a ampla distribuição geográfica. Neste trabalho, foram analisados citogeneticamente espécimes de Astyanax laticeps do sistema da laguna do Patos. O número diplóide observado foi de 2n = 50 cromossomos distribuídos em 6m+16sm+16st+12a (NF= 88), sem di
Publicado em: 2010
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2. Estudo da Atividade Tóxica para Aedes aegypti das proteínas Cry4Aa e Cry4Ba de Bacillus thuringiensis expressas em baculovírus recombinantes
The cry4Aa and cry4Ba genes from Brazilian strains of Bacillus thuringiensis, S-1806 and S-1989, respectively, were amplified by PCR, cloned into a plasmid cloning vector and sequenced. Sequence analysis of the cry4Aa gene showed high identity to previous known cry genes and it was cloned into both pSynXIVVI+X3 and pFastBac1 transfer vectors for expression a
Publicado em: 2007
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3. Intermolecular Transposition of Is10 Causes Coupled Homologous Recombination at the Transposition Site
Interplasmid and chromosome to plasmid transposition of IS10 were studied by assaying inactivation of the phage 434 cI gene, carried on a low copy number plasmid. This was detected by the activity of the tet gene expressed from the phage 434 P(R) promoter. Each interplasmid transposition resulted in the fusion of the donor and acceptor plasmids into cointegr
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4. Tn7 Transposition Creates a Hotspot for Homologous Recombination at the Transposon Donor Site
Homologous recombination at the bacterial transposon Tn7 donor site is stimulated 10-fold when Tn7 is activated to transpose at high frequency in RecD(-) Escherichia coli, where recombination is focused near the ends of double-chain breaks. This is observed as an increase in recombination between two lacZ heteroalleles when one copy of lacZ carries within it
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5. Structural and functional analyses of the fosfomycin resistance transposon Tn2921.
The fosfomycin resistance transposon Tn2921 is flanked by directly repeated sequences homologous to the Tn10-related insertion sequence IS10. The nonrepeated DNA sequences of Tn2921 can be deleted without affecting the transposition ability of the element, showing that at least one of the direct repeats is an active insertion sequence. Transposition of Tn292
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6. Cointegrate formation by Tn5, but not transposition, is dependent on recA.
We have studied the effect of the recA-dependent homologous recombination system of Escherichia coli on both Tn5-mediated cointegrate formation and Tn5 transposition. We demonstrate here that, whereas transposition of Tn5 is independent of the recA gene product (as has been shown by other workers), Tn5-mediated cointegrate formation is strongly dependent on
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7. The C-terminal portion of RAG2 protects against transposition in vitro
The assembly of antigen receptor genes by V(D)J recombination is initiated by the RAG1/RAG2 protein complex, which introduces double-strand breaks between recombination signal sequences and their coding DNA. Truncated forms of RAG1 and RAG2 are functional in vivo and have been used to study V(D)J cleavage, hybrid joint formation and transposition in vitro. H
Oxford University Press.
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8. Germinal Excisions of the Maize Transposon Activator Do Not Stimulate Meiotic Recombination or Homology-Dependent Repair at the Bz Locus
Double-strand breaks have been implicated both in the initiation of meiotic recombination in yeast and as intermediates in the transposition process of nonreplicative transposons. Some transposons of this class, notably P of Drosophila and Tc1 of Caenorhabditis elegans, promote a form of homology-dependent premeiotic gene conversion upon excision. In this wo
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9. Evolution of homologous sequences on the human X and Y chromosomes, outside of the meiotic pairing segment.
A sequence isolated from the long arm of the human Y chromosome detects a highly homologous locus on the X. This homology extends over at least 50 kb of DNA and is postulated to be the result of a transposition event between the X and Y chromosomes during recent human evolution, since homologous sequences are shown to be present on the X chromosome alone in
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10. Identification of a transposon Tn7-dependent DNA-binding activity that recognizes the ends of Tn7.
The bacterial transposon Tn7 is distinguished by its capacity for high-frequency transposition to a specific site in the Escherichia coli chromosome. tnsB is one of the five Tn7-encoded transposition genes. We have identified in vitro a tnsB-dependent DNA binding activity that interacts specifically with cis-acting transposition sequences at the Tn7 termini.
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11. The presence of conjugative transposon Tn916 in the recipient strain does not impede transfer of a second copy of the element.
Transfer of the conjugative transposon Tn916 from the chromosome of Bacillus subtilis to a transposon-free Streptococcus pyogenes strain occurs at the same frequency as transfer to a Tn916-containing recipient. This rules out a model for conjugal transfer of Tn916 in which a copy of the element in the recipient represses transposition of a copy introduced by
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12. Spontaneous deletion of citrate-utilizing ability promoted by insertion sequences.
The citrate utilization (Cit+) transposon Tn3411 was shown to be flanked by directly repeated sequences (IS3411L and IS3411R) by restriction enzyme analysis and electron microscope observation. Cit- deletion mutants were frequently found to be generated in pBR322::Tn3411 by intramolecular recombination between the two copies of IS3411. The flanking IS3411 el