PDGFRA: Function, Mutation and Therapy
PDGFRA is a gene and receptor protein that plays a key role in cell growth and differentiation, and is mutated in certain cancers such as GIST.
Things worth knowing about "PDGFRA"
PDGFRA is a gene and receptor protein that plays a key role in cell growth and differentiation, and is mutated in certain cancers such as GIST.
What is PDGFRA?
PDGFRA (Platelet-derived Growth Factor Receptor Alpha) is a protein encoded by the PDGFRA gene. It is a receptor tyrosine kinase located on the surface of cells, where it receives signals from the surrounding environment and transmits them into the cell interior. These signals regulate essential cellular processes including cell growth, division, survival, and differentiation.
Biological Function
PDGFRA belongs to the family of receptor tyrosine kinases. It binds specific growth factors of the PDGF family (Platelet-derived Growth Factors), particularly PDGF-AA, PDGF-AB, and PDGF-BB. Upon ligand binding, the receptor activates itself through phosphorylation and triggers a downstream signalling cascade inside the cell.
- Regulation of cell proliferation (cell division)
- Promotion of cell migration
- Support of cell differentiation
- Involvement in embryonic development and tissue repair
Clinical Significance: PDGFRA Mutations and Cancer
Mutations in the PDGFRA gene can render the receptor permanently active even in the absence of a bound growth factor. This leads to uncontrolled cell proliferation and can contribute to the development of cancer. PDGFRA mutations are particularly relevant in the following conditions:
- Gastrointestinal Stromal Tumours (GIST): Approximately 5–10% of all GISTs harbour PDGFRA gene mutations, with the D842V point mutation in exon 18 being the most common.
- Acute Myeloid Leukaemia (AML) and other haematological neoplasms
- Glioblastoma: Amplifications and mutations of the PDGFRA gene have been detected in certain brain tumours.
- Myeloproliferative Neoplasms featuring the FIP1L1-PDGFRA gene fusion, which results in a constitutively active tyrosine kinase
Diagnosis
Determining the PDGFRA mutation status is an important component of molecular pathological diagnostics for tumours such as GIST. It is typically performed using:
- Sequencing (e.g., Sanger sequencing or Next Generation Sequencing, NGS) of tumour tissue
- Fluorescence In Situ Hybridisation (FISH) to detect gene amplifications or fusions
- Immunohistochemistry (IHC) for protein expression analysis
The mutation status has direct therapeutic consequences, as it determines the selection of the most appropriate targeted therapy.
Therapeutic Relevance: Targeted Therapies
Since PDGFRA is a tyrosine kinase, its activity can be inhibited by tyrosine kinase inhibitors (TKIs). Depending on the type of mutation, tumours respond differently to various agents:
- Imatinib (Gleevec/Glivec): The first approved TKI for GIST; effective against many KIT and certain PDGFRA mutations, but not the D842V mutation.
- Avapritinib (Ayvakit): Specifically approved for PDGFRA exon 18 mutations, including D842V; demonstrates high efficacy against this previously difficult-to-treat mutation.
- Sunitinib and Regorafenib: Further TKIs used in imatinib-resistant GIST.
Importance for Precision Medicine
Analysis of the PDGFRA gene is a prime example of precision medicine (also called personalised medicine): by precisely characterising the mutation present, the most appropriate therapy can be selected. This improves treatment outcomes and avoids unnecessary side effects from unsuitable medications.
References
- Heinrich MC et al. - Avapritinib in metastatic PDGFRA D842V-mutant gastrointestinal stromal tumours. Nature Medicine, 2020.
- Corless CL, Barnett CM, Heinrich MC - Gastrointestinal stromal tumours: origin and molecular oncology. Nature Reviews Cancer, 2011.
- National Cancer Institute (NCI) - PDGFRA Gene Entry. NCI Thesaurus, 2024. Available at: https://www.cancer.gov
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