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The Xenopus FcR family demonstrates continually high diversification of paired receptors in vertebrate evolution.

Abstract：

BACKGROUND:Recent studies have revealed an unexpected diversity of domain architecture among FcR-like receptors that presumably fulfill regulatory functions in the immune system. Different species of mammals, as well as chicken and catfish have been found to possess strikingly different sets of these receptors. To better understand the evolutionary history of paired receptors, we extended the study of FcR-like genes in amphibian representatives Xenopus tropicalis and Xenopus laevis. RESULTS:The diploid genome of X. tropicalis contains at least 75 genes encoding paired FcR-related receptors designated XFLs. The allotetraploid X. laevis displays many similar genes primarily expressed in lymphoid tissues. Up to 35 domain architectures generated by combinatorial joining of six Ig-domain subtypes and two subtypes of the transmembrane regions were found in XFLs. None of these variants are shared by FcR-related proteins from other studied species. Putative activating XFLs associate with the FcRgamma subunit, and their transmembrane domains are highly similar to those of activating mammalian KIR-related receptors. This argues in favor of a common origin for the FcR and the KIR families. Phylogenetic analysis shows that the entire repertoires of the Xenopus and mammalian FcR-related proteins have emerged after the amphibian-amniotes split. CONCLUSION:FcR- and KIR-related receptors evolved through continual species-specific diversification, most likely by extensive domain shuffling and birth-and-death processes. This mode of evolution raises the possibility that the ancestral function of these paired receptors was a direct interaction with pathogens and that many physiological functions found in the mammalian receptors were secondary acquisitions or specializations.

journal_name

BMC Evol Biol

journal_title

BMC evolutionary biology

authors

Guselnikov SV,Ramanayake T,Erilova AY,Mechetina LV,Najakshin AM,Robert J,Taranin AV

doi

10.1186/1471-2148-8-148

subject

Has Abstract

pub_date

2008-05-16 00:00:00

pages

148

issn

1471-2148

pii

1471-2148-8-148

journal_volume

8

pub_type

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