Motivation: Alzheimer’s Disease (AD) is a highly prevalent, neurodegenerative
disease which causes gradual cognitive decline. As documented in the literature, evi-
dence has recently mounted for the role of metabolic dysfunction in AD. Metabolomic
data has therefore been increasingly used in AD studies. Metabolomic disease studies
often suffer from small sample sizes and inflated false discovery rates. It is therefore
of great importance to identify algorithms best suited for the inference of metabolic
networks from small cohort disease studies. For future benchmarking, and for the
development of new metabolic network inference methods, it is similarly important
to identify appropriate performance measures for small sample sizes.
Results: The performances of 13 different network inference algorithms, includ-
ing correlation-based, regression-based, information theoretic, and hybrid methods,
were assessed through benchmarking and structural network analyses. Benchmark-
ing was performed on simulated data with known structures across six sample sizes
using three different summative performance measures: area under the Receiver Op-
erating Characteristic Curve, area under the Precision Recall Curve, and Matthews
Correlation Coefficient. Structural analyses (commonly applied in disease studies),
including betweenness, closeness, and eigenvector centrality were applied to simu-
lated data. Differential network analysis was additionally applied to experimental
AD data. Based on the performance measure benchmarking and network analysis
results, I identified Probabilistic Context Likelihood Relatedness of Correlation with
Biweight Midcorrelation (PCLRCb) (a novel variation of the PCLRC algorithm)
to be best suited for the prediction of metabolic networks from small-cohort disease
studies. Additionally, I identified Matthews Correlation Coefficient as the best mea-
sure with which to evaluate the performance of metabolic network inference methods
across small sample sizes. / Graduate
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/13964 |
| Date | 24 May 2022 |
| Creators | Greenyer, Haley |
| Contributors | Jabbari, Hosna, Stege, Ulrike |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
| Rights | Available to the World Wide Web |
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