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Protein networks as a scaffold for structuring other data Lars Juhl Jensen EMBL Heidelberg
cell cycle regulation
 
Chapter 1
interaction networks
what is an interaction?
functional interactions
physical interactions
yeast two-hybrid
complex pull-down
 
high-throughput
S. cerevisiae
Uetz et al.
Ito et al.
Gavin et al.
Ho et al.
Gavin et al.
Krogan et al.
C. elegans
Li et al.
D. melanogaster
Giot et al.
H. sapiens
Stelzl et al.
Rual et al.
 
yeehaa!
network topology
degree distribution
 
scale-free
 
hubs
essentiality
network robustness
targeted attacks
artefacts
self-activating baits
highly expressed proteins
Han et al.
 
can we trust this data?
the human interactome
(incomplete)
yeast two-hybrid
1936 13 4 4 1385 65 18465 Stelzl  et al. Rual  et al. Small-scale studies
32 0 3 4 18 4 23 Stelzl  et al. Rual  et al. Small-scale studies
62 8 39 Small-scale studies Stelzl  et al. Rual  et al. 852 17 473 432 69 260
3.5% and 21% sensitivity
the yeast interactome
five years ago
yeast two-hybrid
1150 117 117 72 4053 118 4469 Uetz  et al. Ito  et al. Small-scale studies
162 53 34 72 180 29 338 Uetz  et al. Ito  et al. Small-scale studies
511 189 616 Small-scale studies Uetz  et al. Ito  et al. 439 178 759 897 190 1347
19% and 12% sensitivity
three years ago
complex pull-down
14186 784 1178 287 19492 230 3475 Gavin  et al. Ho  et al. Small-scale studies
2341 125 656 287 2725 42 149 Gavin  et al. Ho  et al. Small-scale studies
4431 1465 5041 Small-scale studies Gavin  et al. Ho  et al. 14913 1071 632 8047 517 746
63% and 41% sensitivity
what about accuracy?
 
 
30–50% specificity
what can we do about it?
topology-based scoring
complex pull-down
log[(N 12 · N)/((N 1 +1) · (N 2 +1))]
yeast two-hybrid
-log((N 1 +1) · (N 2 +1))
calibrate against KEGG
 
subcellular localization
 
filtering
high-throughput
 
high-confidence
Chapter 2
expression data
S. cerevisiae
 
synchronized cell culture
microarray time series
 
periodically expressed genes
 
S. cerevisiae
Cho et al.
Spellman et al.
yeehaa!
Zhao et al.
Langmead et al.
Johansson et al.
Wichert et al.
Luan and Li
Lu et al.
Ahdesm äki et al.
Willbrand et al.
Chen et al.
Qiu et al.
Ahnert et al.
Andersson et al.
no benchmarking
reanalysis
benchmarking
 
no progress
no benchmarking
 
Chapter 3
1+2 = 3
expression data
 
protein interactions
 
temporal network
 
benchmarking
 
 
very low error rate
discovery tool
 
30+ uncharacterized proteins
detailed function prediction
novel module
 
global statements
dynamic and static
 
 
CDK–cyclin complexes
 
consistent timing
 
 
pre-replication complex
 
just-in-time assembly
 
how can we test this?
evolutionary conservation
Chapter 4
more expression data
S. cerevisiae
microarray time series
 
periodically expressed genes
 
S. pombe
Rustici et al.
(good job)
Peng et al.
Oliva et al.
no benchmarking
no integration
reanalysis
benchmarking
 
no progress
no benchmarking
no integration
 
H. sapiens
Whitfield et al.
reanalysis
benchmarking
 
A. thaliana
Menges et al.
reanalysis
benchmarking
 
list of genes
peak times
Chapter 5
cross-species comparison
orthology assignment
peak times
not comparable
time warping
 
 
not conserved
individual genes
just-in-time assembly
protein complexes
DNA polymerases
 
pre-replication complex
 
chromatid cohesion
 
reproduces what is known
known differences
timing has changed
identity has changed
self-consistent
make sense
protein complexes
individual genes
broader perspective
protein networks
context
understanding
Acknowledgments Ulrik de Lichtenberg Thomas Skøt Jensen Christian von Mering Søren Brunak Peer Bork

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Protein networks as a scaffold for structuring other data