Phylogenetic inference identifies two eumetazoan TRPM clades and an 8th family of TRP channel, TRP soromelastatin (TRPS)

Author:

Himmel Nathaniel J.ORCID,Gray Thomas R.ORCID,Cox Daniel N.ORCID

Abstract

AbstractTRP melastatins (TRPMs) are most well-known as cold and menthol sensors, but are in fact broadly critical for life, from ion homeostasis to reproduction. Yet the evolutionary relationship between TRPM channels remains largely unresolved, particularly with respect to the placement of several highly divergent members. To characterize the evolution of TRPM and like channels, we performed a large-scale phylogenetic analysis of >1,300 TRPM-like sequences from 14 phyla (Annelida, Arthropoda, Brachiopoda, Chordata, Cnidaria, Echinodermata, Hemichordata, Mollusca, Nematoda, Nemertea, Phoronida, Priapulida, Tardigrada, and Xenacoelomorpha), including sequences from a variety of recently sequenced genomes that fill what would otherwise be substantial taxonomic gaps. These findings suggest: (1) The previously recognized TRPM family is in fact two distinct families, including canonical TRPM channels, and an 8th major, previously undescribed family of animal TRP channel, TRP soromelastatin (TRPS); (2) two TRPM clades predate the last bilaterian-cnidarian ancestor; and (3) the vertebrate-centric trend of categorizing TRPM channels as 1-8 is inappropriate for most phyla, including other chordates.

Publisher

Cold Spring Harbor Laboratory

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