Transcriptional and translational downregulation of H-REV107, a class II tumour suppressor gene located on human chromosome 11q11-12.
The H-rev107 tumour suppressor was isolated as a gene specifically expressed in rat fibroblasts resistant toward malignant transformation by the activated HRAS gene (Sers et al., 1997; Hajnal et al., 1994). Here we describe the human homologue of the rat H-rev107 gene. The predicted rat and human proteins are highly conserved exhibiting an overall amino acid identity of 83%. The H-REV107-1 gene is ubiquitously expressed with the exception of haematopoetic cells and tissues. In contrast, H-REV107-1 mRNA was found only in eight of 27 cell lines derived from mammary carcinoma, lung carcinoma, gastric carcinoma, kidney carcinoma, melanoma, neuroblastoma and other tumours. The H-REV107-1 protein was not detectable in any of these tumour cells. Loss of H-REV107-1 expression was not restricted to cultured human tumour cell lines, but also found in primary squamous cell carcinomas. Gross structural aberrations of the H-REV107-1 gene were absent in tumorigenic cell lines. Thus, the block to H-REV107-1 expression is achieved both at the level of transcription and translation. By fluorescence in situ hybridisation the human H-REV107-1 gene was localised to chromosome 11q11-12.
Husmann
K
K
Department of Pathology, University of Zürich, Switzerland.
Sers
C
C
Fietze
E
E
Mincheva
A
A
Lichter
P
P
Schäfer
R
R
D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D002874:Chromosome Mapping; D002880:Chromosomes, Human, Pair 11; D015536:Down-Regulation; D015972:Gene Expression Regulation, Neoplastic; D016147:Genes, Tumor Suppressor; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D005810:Multigene Family; D054512:Phospholipases A2, Calcium-Independent; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics*; D051381:Rats; D017421:Sequence Analysis; D017386:Sequence Homology, Amino Acid; D014018:Tissue Distribution; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured; D025521:Tumor Suppressor Proteins
D047908:Intracellular Signaling Peptides and Proteins; D011506:Proteins; D025521:Tumor Suppressor Proteins; C490065:PLAAT3 protein, human; D054512:Phospholipases A2, Calcium-Independent; C085466:Plaat3 protein, rat