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[Expression of a splice-variant of the mts1 gene in normal and tumorous human tissue]
N S Ambartsumian1, S V Tarabykina, M S Grigorian
1Danish Society for Cancer Research, Copenhagen, Denmark.
Abstract:
Data on cloning of cDNA corresponding to human mts1 gene transcripts are presented. By comparing nucleotide sequences of the genomic DNA clone and cDNA of mts1, it was shown that human osteosarcoma OHS cells contain two alternative splice variants of mts1 transcripts. Alternative splicing occurs in the 5'-untranslated region of the mts1 pre-mRNA. Both splice variants, hu-mts1 and hu-mts1(var), demonstrate similar stability in the cells, and each contains one open reading frame for the MTS1 protein. However, the two types of transcripts are translated with different effectiveness. The level of transcription of mts1 splice variants in different normal and neoplastic tissues and cell lines varies significantly. The role of alternative splicing as the mechanism responsible for posttranscriptional regulation of mts1 gene expression is discussed.
Insights
Human osteosarcoma cells exhibit two alternative splice variants of the mts1 gene, differing in translation efficiency. Alternative splicing in the 5'-untranslated region regulates mts1 gene expression post-transcriptionally.
Area of Science:
- Molecular Biology
- Genetics
- Gene Expression Regulation
Context:
- The mts1 gene, also known as S100A4, plays a role in cell proliferation, differentiation, and metastasis.
- Alternative splicing is a key mechanism for generating protein diversity from a single gene.
- Understanding gene regulation is crucial for comprehending cellular processes and disease development.
Purpose:
- To investigate the alternative splicing of human mts1 gene transcripts.
- To analyze the structural and functional differences between mts1 splice variants.
- To explore the role of alternative splicing in regulating mts1 gene expression.
Summary:
- Cloning and sequencing of human mts1 gene transcripts revealed two alternative splice variants, hu-mts1 and hu-mts1(var), in osteosarcoma cells.
- These variants differ in their 5 -untranslated regions but share similar stability and an open reading frame for the MTS1 protein.
- Differential translation effectiveness of these variants suggests a post-transcriptional regulatory mechanism for mts1 gene expression.
Impact:
- Identifies alternative splicing as a significant regulatory mechanism for the human mts1 gene.
- Provides insights into the molecular basis of mts1 gene expression variability in normal and neoplastic tissues.
- Contributes to the understanding of gene regulation in cancer biology and may inform therapeutic strategies.