Evolutionary Analyses Reveal Independent Origins of Gene Repertoires and Structural Motifs Associated to Fast Inactivation in Calcium-selective TRPV Channels

Overview

Journal Sci Rep

Specialty Science

Date 2020 May 28

PMID 32457384

Citations 11

Authors

Lisandra Flores-Aldama

Michael W Vandewege

Kattina Zavala

Charlotte K Colenso

Wendy Gonzalez

Sebastian E Brauchi

Juan C Opazo

Affiliations

Soon will be listed here.

Abstract

Essential for calcium homeostasis, TRPV5 and TRPV6 are calcium-selective channels belonging to the transient receptor potential (TRP) gene family. In this study, we investigated the evolutionary history of these channels to add an evolutionary context to the already available physiological information. Phylogenetic analyses revealed that paralogs found in mammals, sauropsids, amphibians, and chondrichthyes, are the product of independent duplication events in the ancestor of each group. Within amniotes, we identified a traceable signature of three amino acids located at the amino-terminal intracellular region. The signature correlates with both the duplication events and the phenotype of fast inactivation observed in mammalian TRPV6 channels. Electrophysiological recordings and mutagenesis revealed that the signature sequence modulates the phenotype of fast inactivation in all clades of vertebrates but reptiles. A transcriptome analysis showed a change in tissue expression from gills, in marine vertebrates, to kidneys in terrestrial vertebrates. Our results highlight a cytoplasmatic structural triad composed by the Helix-Loop-Helix domain, the S2-S3 linker, and the TRP domain helix that is important on modulating the activity of calcium-selective TRPV channels.

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