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Published on: November 11, 2014
EDClust: an EM-MM hybrid method for cell clustering in multiple-subject single-cell RNA sequencing
Xin Wei1, Ziyi Li2, Hongkai Ji3
1Department of Biostatistics and Bioinformatics, Emory University, Atlanta, GA 30322, USA.
Motivation:
Single-cell RNA sequencing (scRNA-seq) has revolutionized biological research by enabling the measurement of transcriptomic profiles at the single-cell level. With the increasing application of scRNA-seq in larger-scale studies, the problem of appropriately clustering cells emerges when the scRNA-seq data are from multiple subjects. One challenge is the subject-specific variation; systematic heterogeneity from multiple subjects may have a significant impact on clustering accuracy. Existing methods seeking to address such effects suffer from several limitations.
Results:
We develop a novel statistical method, EDClust, for multi-subject scRNA-seq cell clustering. EDClust models the sequence read counts by a mixture of Dirichlet-multinomial distributions and explicitly accounts for cell-type heterogeneity, subject heterogeneity and clustering uncertainty. An EM-MM hybrid algorithm is derived for maximizing the data likelihood and clustering the cells. We perform a series of simulation studies to evaluate the proposed method and demonstrate the outstanding performance of EDClust. Comprehensive benchmarking on four real scRNA-seq datasets with various tissue types and species demonstrates the substantial accuracy improvement of EDClust compared to existing methods.
Availability And Implementation:
The R package is freely available at https://github.com/weix21/EDClust.
Supplementary Information:
Supplementary data are available at Bioinformatics online.
