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Alternatively spliced platelet-derived growth factor A-chain transcripts are not tumor specific but encode normal
R M Young1, A E Mendoza, T Collins
1Division of Hematology-Oncology, Children's Hospital, Boston, Massachusetts.
Molecular and Cellular Biology
|November 1, 1990
Summary
Two forms of platelet-derived growth factor A-chain proteins are produced via alternative mRNA splicing. Both short and long A-chain transcripts and long A-chain protein are found in normal tissues.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Platelet-derived growth factor (PDGF) is crucial for cell growth and development.
- Alternative mRNA splicing is a key mechanism regulating protein diversity.
Purpose of the Study:
- To investigate the generation and distribution of two distinct platelet-derived growth factor A-chain proteins.
- To confirm the expression of these protein variants in normal tissues.
Main Methods:
- S1 nuclease mapping to analyze RNA transcripts.
- Polymerase chain reaction (PCR) to detect gene expression.
- Immunohistochemical localization to determine protein distribution.
Main Results:
- Two PDGF A-chain proteins, short and long, arise from alternative splicing of exon 6.
- Both short and long A-chain transcripts are expressed across various normal tissues.
- Long A-chain protein exhibits a cellular distribution consistent with PDGF heteroserum.
Conclusions:
- Alternative splicing of the PDGF A-chain gene generates functionally distinct protein isoforms.
- These isoforms are widely expressed in normal tissues, suggesting diverse biological roles.
- The cellular localization of the long A-chain protein supports its involvement in PDGF signaling pathways.