Repbase Reports
2012, Volume 12, Issue 10
October 31, 2012
Copyright © 2001-2016 - Genetic Information Research Institute
ISSN# 1534-830X
Page 2125

DNA-TA-21-I_NV

Internal portion of the DNA-TA-21_NV transposon - consensus.

Submitted:
22-Mar-2011 		Accepted:
31-Oct-2012
Key Words:
DNA transposon; Transposable Element; nonautonomous; DNA-TA-21_NV; DNA-TA-21-LTR_NV; DNA-TA-21-I_NV
Source:
Nematostella vectensis 		Organism:
Nematostella vectensis 		Taxonomy:
Eukaryota; Metazoa; Cnidaria; Anthozoa; Hexacorallia; Actiniaria; Edwardsiidae; Nematostella
[3] Authors:
Kapitonov,V. and Jurka,J.
Title:
DNA-TA-21_NV - a family of really unusual transposons from the starlet sea anemone genome.
Journal:
Repbase Reports 12(10), 2125-2125 (2012)
Abstract:
Originally, this transposable element was reported under name REP5, composed of the REP5-xLTR_NV and REP5-xI_NV parts [1]. Later on, we renamed these to DNA-TA-21_NV, DNA-TA-21-LTR_NV and DNA-TA-21-I_NV, respectively. The genome contains numerous solo copies of DNA-TA-21-LTR_NV, inserted into CTAG target sites (accompanied by the TA target site duplications). In addition to the solo LTRs, the genome contains many copies of complete DNA-TA-21_NV elements, composed of the internal portion flanked by its two LTRs. Again, the complete elements are also inserted into the CTAG target sites, with the TA TSDs. Finally, the genome contains also structures like LTR-I-LTR-I-LTR. On the one hand, similar structures are typical for LTR retrotransposons. However, DNA-TA-21-I_NV does not have a 3' polypurine tract and 5' primer binding site that are typically present in autonomous and non-autonomous LTR retrotransposons. Moreover, DNA-TA-21-LTR_NV contains 33/32-bp TIRs, analogous to DNA transposons. Also, known LTR retrotransposons do not produce 2-bp target site duplications. Therefore, we classify this transposable element as a DNA transposon. We predict that DNA-TA-21_NV belongs to a novel group of transposons mobilized by autonomous elements with uknown enzymatic activities.
Derived:
[3] (Consensus)
Download Sequence - Format:
IG, EMBL, FASTA
References:
  1. Putnam,N.H., Srivastava,M., Hellsten,U., Dirks,B., Chapman,J., Salamov,A., Terry,A., Shapiro,H. and Lindquist,E. et al.
    Sea anemone genome reveals ancestral eumetazoan gene repertoire and genomic organization.
    Science 317(5834), 86-94 (2007)

  2. Kapitonov,V.V. and Jurka,J.
    Transposable elements in the starlet sea anemone genome.
    Deposited to Repbase as the tmpnemrep.ref file (02-May-2008)

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