A refinement of the split decomposition of a tridiagonal pair

The split decomposition of a tridiagonal pair

Linear Algebra and its Applications ◽

10.1016/j.laa.2007.01.028 ◽

2007 ◽

Vol 424 (2-3) ◽

pp. 339-345 ◽

Cited By ~ 15

Author(s):

Kazumasa Nomura ◽

Paul Terwilliger

Keyword(s):

Split Decomposition ◽

Tridiagonal Pair

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Molecular analysis of the dengue virus type 1 and 2 in Brazil based on sequences of the genomic envelope-nonstructural protein 1 junction region

Revista do Instituto de Medicina Tropical de São Paulo ◽

10.1590/s0036-46652004000300005 ◽

2004 ◽

Vol 46 (3) ◽

pp. 145-152 ◽

Cited By ~ 5

Author(s):

Cecília Luiza S. Santos ◽

Maria Anice M. Sallum ◽

Peter G. Foster ◽

Iray Maria Rocco

Keyword(s):

Sequence Data ◽

Nonstructural Protein ◽

Phylogenetic Analyses ◽

Decomposition Analysis ◽

Structural Protein ◽

Network Graph ◽

Junction Region ◽

Split Decomposition ◽

Genotype Iii ◽

Nonstructural Protein 1

The genomic sequences of the Envelope-Non-Structural protein 1 junction region (E/NS1) of 84 DEN-1 and 22 DEN-2 isolates from Brazil were determined. Most of these strains were isolated in the period from 1995 to 2001 in endemic and regions of recent dengue transmission in São Paulo State. Sequence data for DEN-1 and DEN-2 utilized in phylogenetic and split decomposition analyses also include sequences deposited in GenBank from different regions of Brazil and of the world. Phylogenetic analyses were done using both maximum likelihood and Bayesian approaches. Results for both DEN-1 and DEN-2 data are ambiguous, and support for most tree bipartitions are generally poor, suggesting that E/NS1 region does not contain enough information for recovering phylogenetic relationships among DEN-1 and DEN-2 sequences used in this study. The network graph generated in the split decomposition analysis of DEN-1 does not show evidence of grouping sequences according to country, region and clades. While the network for DEN-2 also shows ambiguities among DEN-2 sequences, it suggests that Brazilian sequences may belong to distinct subtypes of genotype III.

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