Deciphering the associations between gene expression and copy number alteration using a sparse double Laplacian shrinkage approach

Xingjie Shi, Qing Zhao, Jian Huang, Yang Xie, Shuangge Ma

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Motivation: Both gene expression levels (GEs) and copy number alterations (CNAs) have important biological implications. GEs are partly regulated by CNAs, and much effort has been devoted to understanding their relations. The regulation analysis is challenging with one gene expression possibly regulated by multiple CNAs and one CNA potentially regulating the expressions of multiple genes. The correlations among GEs and among CNAs make the analysis even more complicated. The existing methods have limitations and cannot comprehensively describe the regulation. Results: A sparse double Laplacian shrinkage method is developed. It jointly models the effects of multiple CNAs on multiple GEs. Penalization is adopted to achieve sparsity and identify the regulation relationships. Network adjacency is computed to describe the interconnections among GEs and among CNAs. Two Laplacian shrinkage penalties are imposed to accommodate the network adjacency measures. Simulation shows that the proposed method outperforms the competing alternatives with more accurate marker identification. The Cancer Genome Atlas data are analysed to further demonstrate advantages of the proposed method.

Original languageEnglish (US)
Pages (from-to)3977-3983
Number of pages7
JournalBioinformatics
Volume31
Issue number24
DOIs
StatePublished - Jul 3 2015

Fingerprint

Gene Dosage
Shrinkage
Gene expression
Gene Expression
Genes
Adjacency
Atlases
Genome
Penalization
Atlas
Sparsity
Interconnection
Penalty
Cancer
Neoplasms
Gene
Alternatives
Demonstrate

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Computational Theory and Mathematics
  • Computer Science Applications
  • Computational Mathematics
  • Statistics and Probability

Cite this

Deciphering the associations between gene expression and copy number alteration using a sparse double Laplacian shrinkage approach. / Shi, Xingjie; Zhao, Qing; Huang, Jian; Xie, Yang; Ma, Shuangge.

In: Bioinformatics, Vol. 31, No. 24, 03.07.2015, p. 3977-3983.

Research output: Contribution to journalArticle

Shi, Xingjie ; Zhao, Qing ; Huang, Jian ; Xie, Yang ; Ma, Shuangge. / Deciphering the associations between gene expression and copy number alteration using a sparse double Laplacian shrinkage approach. In: Bioinformatics. 2015 ; Vol. 31, No. 24. pp. 3977-3983.
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