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Phylogenetic analysis of the Argonaute protein family in platyhelminths.

Abstract：

:Argonaute proteins (AGOs) are mediators of gene silencing via recruitment of small regulatory RNAs to induce translational regression or degradation of targeted molecules. Platyhelminths have been reported to express microRNAs but the diversity of AGOs in the phylum has not been explored. Phylogenetic relationships of members of this protein family were studied using data from six platyhelminth genomes. Phylogenetic analysis showed that all cestode and trematode AGOs, along with some triclad planarian AGOs, were grouped into the Ago subfamily and its novel sister clade, here referred to as Cluster 1. These were very distant from Piwi and Class 3 subfamilies. By contrast, a number of planarian Piwi-like AGOs formed a novel sister clade to the Piwi subfamily. Extensive sequence searching revealed the presence of an additional locus for AGO2 in the cestode Echinococcus granulosus and exon expansion in this species and E. multilocularis. The current study suggests the absence of the Piwi subfamily and Class 3 AGOs in cestodes and trematodes and the Piwi-like AGO expansion in a free-living triclad planarian and the occurrence of exon expansion prior to or during the evolution of the most-recent common ancestor of the Echinococcus species studied.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Zheng Y

doi

10.1016/j.ympev.2012.11.014

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

1050-4

issue

3

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(12)00463-0

journal_volume

66

pub_type

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