Cooperative exonization of MaLR and AluJo elements contributed an alternative promoter and novel splice variants of RNF19

Gene. 2008 Nov 15;424(1-2):63-70. doi: 10.1016/j.gene.2008.07.030. Epub 2008 Aug 5.

Abstract

The RNF19 protein, which contains RING-finger and IBR motifs, acts as an E3 ubiquitin ligase localized to Lewy bodies. RNF19 is located on human chromosome 8q22.2, has a 4.4-kb transcript, and is ubiquitously expressed in various tissues. Here, we identified an alternative RNF19 promoter region and alternative RNF19 transcripts derived from MaLR (mammalian apparent LTR-retrotransposon) and AluJo elements. Comparative analyses indicated human-specific expression of the MaLR- and AluJo-related transcripts. From the expression analysis of 72 tissue samples including human normal, tumor, and primate tissues, three different isoforms (V1, V2, and V3) of MaLR-derived transcripts were identified. Quantitative RT-PCR analysis showed a dominant expression pattern of the V2 MaLR-derived transcript. A reporter gene assay for MaLR element promoter activity indicated that pGL2-RNF19/MaLR in the forward orientation is capable of driving luciferase gene expression in Cos7 and HCT116 cells. These findings suggest that RNF19 has acquired a new promoter and alternative exons via continuous retrotransposition events of MaLR and AluJo elements during mammalian and primate evolution, respectively.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alternative Splicing / genetics*
  • Alu Elements / genetics
  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • COS Cells
  • Cell Line, Tumor
  • Chlorocebus aethiops
  • Chromosome Mapping
  • Chromosomes, Human, Pair 8
  • Colonic Neoplasms
  • DNA / genetics
  • DNA / isolation & purification
  • DNA Primers
  • Genetic Variation*
  • Humans
  • Molecular Sequence Data
  • Promoter Regions, Genetic / genetics*
  • RNA / genetics
  • RNA / isolation & purification
  • Reverse Transcriptase Polymerase Chain Reaction
  • Transcription, Genetic
  • Ubiquitin-Protein Ligases / genetics*

Substances

  • DNA Primers
  • RNA
  • DNA
  • RNF19A protein, human
  • Ubiquitin-Protein Ligases