A comparison of genomic structures and expression patterns of two closely related flanking genes in a critical lung cancer region at 3p21.3

T Timmer, P Terpstra, Anke van den Berg, PMJF Veldhuis, A Ter Elst, G Voutsinas, MMF Hulsbeek, TG Draaijers, MWG Looman, K Kok, SL Naylor, CHCM Buys*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

45 Citations (Scopus)

Abstract

In the search for a tumour suppressor gene in the 3P21.3 region we isolated two genes, RBM5 and RBM6. Gene RBM5 maps to the region which is homozygously deleted in the small cell lung cancer cell line GLC20; RBM6 crosses the telomeric breakpoint of this deletion, Sequence comparison revealed that at the amino acid level both genes show 30% identity, They contain two zinc finger motifs, a bipartite nuclear signal and two RNA binding motifs, suggesting that the proteins for which RBM5 and RBM6 are coding have a DNA/RNA binding function and are located in the nucleus. Northern and Southern analysis did not reveal any abnormalities. By SSCP analysis of 16 lung cancer cell lines we found only in RBM5 a single presumably neutral mutation, By RT-PCR we demonstrated the existence of two alternative splice variants of RBM6, one including and one excluding exon 5, in both normal lung tissue and lung cancer cell lines, Exclusion of exon 5 results in a frameshift which would cause a truncated protein of 520 amino acids instead of 1123 amino acids. In normal lung tissue, the relative amount of the shorter transcript was much greater than that in the lung tumour cell lines, which raises the question whether some tumour suppressor function may be attributed to the derived shorter protein.

Original languageEnglish
Pages (from-to)478-486
Number of pages9
JournalEuropean Journal of Human Genetics
Volume7
Issue number4
Publication statusPublished - 1999

Keywords

  • DNA RNA binding proteins
  • 3p21 genes
  • alternative splicing
  • lung cancer
  • tumour suppressor
  • POLYMERASE CHAIN-REACTION
  • RNA-BINDING PROTEIN
  • HOMOZYGOUS DELETION
  • CHROMOSOME 3P21.3
  • LOCUS
  • IDENTIFICATION
  • DEFINITION
  • SEQUENCES
  • MAP

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