Emergence of primate genes by retrotransposon-mediated sequence transduction

Jinchuan Xing, Hui Wang, Victoria P. Belancio, Richard Cordaux, Prescott L. Deininger, Mark A. Batzer

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

Abstract

Gene duplication is one of the most important mechanisms for creating new genes and generating genomic novelty. Retrotransposon-mediated sequence transduction (i.e., the process by which a retrotransposon carries flanking sequence during its mobilization) has been proposed as a gene duplication mechanism. L1 exon shuffling potential has been reported in cell culture assays, and two potential L1-mediated exon shuffling events have been identified in the genome. SVA is the youngest retrotransposon family in primates and is capable of 3′ flanking sequence transduction during retrotransposition. In this study, we examined all of the full-length SVA elements in the human genome to assess the frequency and impact of SVA-mediated 3′ sequence transduction. Our results showed that ≈53 kb of genomic sequences have been duplicated by 143 different SVA-mediated transduction events. In particular, we identified one group of SVA elements that duplicated the entire AMAC gene three times in the human genome through SVA-mediated transduction events, which happened before the divergence of humans and African great apes. In addition to the original AMAC gene, the three transduced AMAC copies contain intact ORFs in the human genome, and at least two are actively transcribed in different human tissues. The duplication of entire genes and the creation of previously undescribed gene families through retrotransposon-mediated sequence transduction represent an important mechanism by which mobile elements impact their host genomes.

Original languageEnglish (US)
Pages (from-to)17608-17613
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume103
Issue number47
DOIs
StatePublished - Nov 21 2006
Externally publishedYes

ASJC Scopus subject areas

  • General

Keywords

  • Gene duplication
  • Mobile element
  • Retrotransposition
  • SVA

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