Phylogenetic expression profiling reveals widespread coordinated evolution of gene expression

BioRxiv : the Preprint Server for Biology
Trevor Martin, Hunter B Fraser

Abstract

Phylogenetic profiling, which infers functional relationships between genes based on patterns of gene presence/absence across species, has proven to be highly effective. Here we introduce a complementary approach, phylogenetic expression profiling (PEP), which detects gene sets with correlated expression levels across a phylogeny. Applying PEP to RNA-seq data consisting of 657 samples from 309 diverse unicellular eukaryotes, we found several hundred gene sets evolving in a coordinated fashion. These allowed us to predict a role of the Golgi apparatus in Alzheimer's disease, as well as novel genes related to diabetes pathways. We also detected adaptive evolution of tRNA ligase levels to match genome-wide codon usage. In sum, we found that PEP is an effective method for inferring functional relationships - especially among core cellular components that are never lost, to which phylogenetic profiling cannot be applied - and that many subunits of the most conserved molecular machines are coexpressed across eukaryotes.

Related Concepts

Biochemical Pathway
Unicellular Trichome Branch
Golgi Apparatus
Genome
Genes
Sequence Determinations, RNA
Phylogenetic Analysis
Molecular Profiling
Alzheimer's Disease
Gene Expression

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