Integrin evolution: Insights from ascidian and teleost fish genomes

TitleIntegrin evolution: Insights from ascidian and teleost fish genomes
Publication TypeJournal Article
Year of Publication2005
Refereed DesignationRefereed
AuthorsHUHTALA, M., HEINO J., CASCIARI D., DELUISE A., & JOHNSON M.
JournalMatrix Biology
Volume24
Issue2
Pagination83 - 95
Date Published04/2005
ISSN0945053X
Abstract

Integrins are a family of αβ heterodimeric receptors essential to cell adhesion in all metazoans. In humans, the family consists of 18 α and 8 β subunits that combine to form 24 dimers. Here, we present phylogenetic reconstructions for the α and β integrin subunits based on sequences from 24 invertebrate and vertebrate species, including the fully sequenced genomes of the ascidian Ciona intestinalis (a urochordate) and the pufferfish Takifugu rubripes (a teleost). Both genomes contain integrin α subunits that have the inserted α I domain. As for the one α I domain containing integrin α subunit discovered earlier from the ascidian Halocynthia roretzi, the Ciona α I domains are missing the distinctive characteristics of mammalian collagen receptors and segregate from all vertebrate α I domain integrins in a phylogenetic tree, forming a new subgroup of α subunits with α I domains. Each of the pufferfish α I domain sequences does have characteristics of the collagen receptor α I domains, but no leukocyte-specific α I domains were found in pufferfish. Comparative protein modeling suggests that several of these fish α I domains are structurally compatible with binding to a GFOGER sequence in a collagen triple helix. © 2005 Elsevier B.V./International Society of Matrix Biology. All rights reserved.

DOI10.1016/j.matbio.2005.01.003
Short TitleMatrix Biology