V3 Loop Sequence Space Analysis Kasia Bo ek bozek@mpi-inf.mpg.de - - PowerPoint PPT Presentation

v3 loop sequence space analysis
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V3 Loop Sequence Space Analysis Kasia Bo ek bozek@mpi-inf.mpg.de - - PowerPoint PPT Presentation

V3 Loop Sequence Space Analysis Kasia Bo ek bozek@mpi-inf.mpg.de MPI Saarbrcken AREVIR meeting, Bonn 11.04.2008 V3 loop highly variable genome sequence related to coreceptor usage CCR5-CXCR4 coreceptor switch related to rapid disease


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V3 Loop Sequence Space Analysis

Kasia Bożek bozek@mpi-inf.mpg.de MPI Saarbrücken

AREVIR meeting, Bonn 11.04.2008

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highly variable genome sequence related to coreceptor usage CCR5-CXCR4 coreceptor switch related to rapid disease progression importance of coreceptor prediction

Kasia Bożek AREVIR meeting Bonn 11.04.2008

V3 loop

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Coreceptor prediction

in-silico phenotypic assays

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

V3 loop sequence space analysis

selection of sequences for experimental imaging of the HIV cell entry understanding of the distribution of V3 loop sequences in their sequence space

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Approach

2 datasets of sequences from Los Alamos NSI/ SI CCR5/ CXCR4/ R5X4 different distance measures Hamming distance BLOSUM matrix amino acid size and charge mutations on significant positions hierarchical clustering phylogenetical analysis using Splitstree

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

NSI vs. NSI SI vs. SI NSI vs. SI Distance distribution

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R5 vs. R5 X4 vs. X4 R5X4 vs. R5X4

Kasia Bożek AREVIR meeting Bonn 11.04.2008

Distance distribution

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Sequence clustering

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Sequence clustering

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Sequence clustering

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Sequence clustering

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

NSI R5 SI X4 R5X4

Sequence clustering

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Phylogenetical analysis

evolution - not always is a branching tree-like process different phylogenetical signals in real data not always fitting into a unique tree Splitstree Splitstree – a tree-like network visualizing conflicting phylogenies

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Phylogenetical analysis

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

split

Phylogenetical analysis

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

SI NSI

Phylogenetical analysis

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Phylogenetical analysis

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Phylogenetical analysis

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Difficult sequences

unexpected placement of some sequences on the tree bad annotation? difficult cases?

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Difficult sequences

unexpected placement of some sequences on the tree bad annotation? difficult cases?

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Difficult sequences

unexpected placement of some sequences on the tree bad annotation? difficult cases?

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Difficult sequences

unexpected placement of some sequences on the tree bad annotation? difficult cases?

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Difficult sequences

unexpected placement of some sequences on the tree bad annotation? difficult cases?

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Difficult sequences

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

selection pressures on the R5 viruses high variability of X4 emergence of X4 and CD4+ T-cell count depletion cause or result of the disease progression?

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

immune system fail precedes the coreceptor switch coreceptor switch anticipates the disease 2 possible scenarios:

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

immune system fail precedes the coreceptor switch coreceptor switch anticipates the disease 2 possible scenarios:

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

immune system fail precedes the coreceptor switch coreceptor switch anticipates the disease highly mutated viruses only in cases of low CD4+ cell count 2 possible scenarios:

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

immune system fail precedes the coreceptor switch coreceptor switch anticipates the disease highly mutated viruses only in cases of low CD4+ cell count 2 possible scenarios:

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

immune system fail precedes the coreceptor switch coreceptor switch anticipates the disease highly mutated viruses only in cases of low CD4+ cell count mutated viruses within all levels of CD4+ cell count 2 possible scenarios:

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Disease and space position

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Kasia Bożek AREVIR meeting Bonn 11.04.2008

Conclusions

conservation of CCR5 V3 loop sequences highly variable CXCR4 viruses association to the immune escape scenario

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Conclusion

Alexander Thielen Oliver Sander André Altmann Thomas Lengauer

Acknowledgements

Rolf Kaiser Saleta Sierra Aragon