NDLI: Effects of cDNA microarray time-series data size on gene regulatory network inference accuracy

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Effects of cDNA microarray time-series data size on gene regulatory network inference accuracy

Content Provider	ACM Digital Library
Author	Chaitankar, Vijender Zhang, Chaoyang Gong, Ping Ghosh, Preetam Perkins, Edward J.
Abstract	A number of models and algorithms have been proposed in the past for gene regulatory network (GRN) inference; however, none of them address the effects of the size of the time-series microarray expression data in terms of number of time-points. In this paper, we study this problem by analyzing the behavior of two algorithms based on information theory models. These algorithms were implemented on different sizes of data generated by synthetic network generation tools. Experiments show that the performances of these algorithms reach a saturation point after a specific data size, thus giving the biologist an idea about what size of data will give the best inference accuracy. Also, the fact that the accuracy saturates after a specific number of time points (the saturation point being different for different algorithms) suggests that generating time-series data for a lot of time-points will not necessary improve the inference accuracy beyond a certain point. To understand this saturation, we found out that the information theoretic quantity, mutual information, tends to zero as the number of time points increase although the entropy in the network rises to unity. This illustrates the fact that mutual information (MI) might not be the best metric to use for GRN inference algorithms. To modify the MI metric we introduce a new method of computing time lags between any pair of genes and present the time lagged mutual information (TLMI) metric for reverse engineering of GRNs.
Starting Page	410
Ending Page	413
Page Count	4
File Format	PDF
ISBN	9781450304382
DOI	10.1145/1854776.1854842
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-08-02
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Gene regulatory networks Information theory
Content Type	Text
Resource Type	Article

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