PIGY, a new plant envelope-class LTR retrotransposon
Language English Country Germany Media print-electronic
Document type Comparative Study, Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- DNA Primers MeSH
- Phylogeny * MeSH
- Genes, env genetics MeSH
- Pisum sativum genetics virology MeSH
- In Situ Hybridization, Fluorescence MeSH
- Terminal Repeat Sequences genetics MeSH
- Evolution, Molecular MeSH
- Molecular Sequence Data MeSH
- Base Pairing MeSH
- Reverse Transcriptase Polymerase Chain Reaction MeSH
- Retroelements genetics MeSH
- RNA Viruses genetics MeSH
- Amino Acid Sequence MeSH
- Base Sequence MeSH
- Sequence Analysis, DNA MeSH
- Sequence Alignment MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Comparative Study MeSH
- Names of Substances
- DNA Primers MeSH
- Retroelements MeSH
Plant LTR retrotransposons of the envelope class define a new branch in the Metaviridae family. They differ from other LTR retrotransposons mainly by the presence of an additional ORF downstream of the gag-pol region which has been hypothesized to be equivalent to the envelope gene of retroviruses. Here we present a newly identified element from pea (Pisum sativum), named PIGY, that has all the features characteristic of this group of LTR retrotransposons. In addition to the potential coding sequence downstream of the gag-pol region, PIGY has a primer binding site complementary to tRNA(asp) and a polypurine tract with a TGGGG motif and is of large size (13,645 bp). The relationship between PIGY and other retrotransposons of the env-class was confirmed by a phylogenetic analysis of their reverse transcriptase domains. One distinctive feature of PIGY is that its env-like region is actually composed of two similar ORFs, each of which encodes a protein with similarity to the Athila envelope-like protein. PIGY is present in the pea genome in 1-5x10(3) copies and is transcriptionally active, suggesting that some of these elements may still be capable of active transposition. Another new env-class retrotransposon similar to PIGY was also identified among genomic sequences of Medicago truncatula.
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