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Diversity, abundance, and evolutionary dynamics of Pong-like transposable elements in Triticeae.

Abstract：

:Pong-like elements are members of the PIF/Harbinger superfamily of DNA transposons that has been described in many plants, animals, and fungi. Most Pong elements contain two open reading frames (ORFs). One encodes a transposase (ORF2) that catalyzes transposition of Pong and related non-autonomous elements, while the function of the second is unknown. Little is known about the evolutionary history of Pong elements in flowering plants. In this work, we present the first comprehensive analysis of the diversity, abundance, and evolution of the Pong-like transposase gene in the genomes of 21 diploid species from the wheat tribe, Triticeae, and we present the first convincing evidence of horizontal transfer of nuclear-encoded Pong elements in any organism. A phylogenetic analysis of nearly 300 Pong sequences based on a conserved region of the transposase domain revealed a complex evolutionary history of Pong elements that can be best explained by ancestral polymorphism, followed by differential evolutionary success of some transposase lineages, and by occasional horizontal transfer between phylogenetically distant genera. In addition, we used transposon display to estimate the abundance of the transposase gene within Triticeae genomes, and our results revealed varying levels of Pong proliferation, with numbers of transposase copies ranging from 22 to 92. Comparisons of Pong transposase abundance to flow cytometry estimates of genome size revealed that larger Triticeae genome size was not correlated with transposase abundance.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Markova DN,Mason-Gamer RJ

doi

10.1016/j.ympev.2015.07.008

subject

Has Abstract

pub_date

2015-12-01 00:00:00

pages

318-30

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(15)00212-2

journal_volume

93

pub_type

杂志文章

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