Harbinger transposons and an ancient HARBI1 gene derived from a transposase.

Abstract:

:In this study we report main properties of Harbinger DNA transposons identified in protists, plants, insects, worms, and vertebrates. This is the first superfamily of eukaryotic DNA transposons where all autonomous transposons, even those that are hosted by species from different kingdoms, encode two proteins: a superfamily-specific transposase and a DNA-binding protein characterized by the presence of the conserved SANT/myb/trihelix motif. The last motif is known to be important for the DNA binding by different transcription regulators. Therefore, we suggest that this protein is necessary for coordinated expression of the Harbinger transposase. Although mammalian genomes are free of recognizable remnants of Harbingers, we identified a widely expressed HARBI1 gene encoding a 350-aa protein entirely derived from a Harbinger transposase some 450-500 million years ago. The HARBI1 proteins are conserved in humans, rats, mice, cows, pigs, chickens, frogs, and various bony fish, as well as other extremely important proteins, including RAG1 and RAG2. Conserved motifs detected in the Harbinger transposases are also well preserved in the HARBI1 proteins. Therefore, the HARBI1 proteins are expected to be nucleases important for functioning of bony vertebrates. We also found that the protein most similar to HARBI1 is encoded by an autonomous Harbinger 3_DR transposon that was transpositionally active in the zebrafish genome a few million years ago. Nonautonomous transposons derived from Harbinger3_DR are characterized by a striking preference for a 17-bp target site never seen previously in any other DNA transposon. Based on this observation, we suggest that the hypothetical HARBI1 nucleases are also characterized by a strong DNA-target specificity.

journal_name

DNA Cell Biol

journal_title

DNA and cell biology

authors

Kapitonov VV,Jurka J

doi

10.1089/104454904323090949

keywords:

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

311-24

issue

5

eissn

1044-5498

issn

1557-7430

journal_volume

23

pub_type

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