The tubulin code in platelet biogenesis
Quentin Kimmerlin1, Catherine Strassel1, Anita Eckly1
1Université de Strasbourg, INSERM, EFS Grand-Est, BPPS UMR-S1255, FMTS, Strasbourg, France.
Abstract:
Blood platelets are small non-nucleated cellular fragments that prevent and stop hemorrhages. They are produced in the bone marrow by megakaryocytes through megakaryopoiesis. This intricate process involves profound microtubule rearrangements culminating in the formation of a unique circular sub-membranous microtubule array, the marginal band, which supports the typical disc-shaped morphology of platelets. Mechanistically, these processes are thought to be controlled by a specific tubulin code. In this review, we summarize the current knowledge on the key isotypes, notably β1-, α4A- and α8-tubulin, and putative post-translational modifications, involved in platelet and marginal band formation. Additionally, we provide a provisional list of microtubule-associated proteins (MAPs) involved in these processes and a survey of tubulin variants identified in patients presenting defective platelet production. A comprehensive characterization of the platelet tubulin code and the identification of essential MAPs may be expected in the near future to shed new light on a very specialized microtubule assembly process with applications in platelet diseases and transfusion.
Insights
Platelet formation relies on a specific tubulin code and microtubule-associated proteins (MAPs) for their shape and function. Understanding these elements aids in treating platelet production disorders and transfusion medicine.
Area of Science:
- Cell Biology
- Hematology
- Biochemistry
Background:
- Blood platelets are crucial for hemostasis, preventing and stopping hemorrhages.
- Platelet production (megakaryopoiesis) involves complex microtubule rearrangements.
- The marginal band, a microtubule array, dictates platelet disc shape.
Purpose of the Study:
- To review current knowledge on the "tubulin code" in platelet formation.
- To identify key tubulin isotypes and modifications involved in marginal band formation.
- To survey microtubule-associated proteins (MAPs) and tubulin variants in platelet disorders.
Main Methods:
- Literature review of tubulin isotypes (β1-, α4A-, α8-tubulin).
- Analysis of post-translational modifications of tubulin.
- Compilation of microtubule-associated proteins (MAPs).
- Survey of tubulin variants in patients with defective platelet production.
Main Results:
- Key tubulin isotypes and their modifications are critical for platelet and marginal band formation.
- A provisional list of essential MAPs involved in these processes is provided.
- Tubulin variants are associated with defective platelet production.
Conclusions:
- Characterizing the platelet tubulin code and essential MAPs is crucial for understanding specialized microtubule assembly.
- This knowledge has potential applications in platelet diseases and transfusion medicine.
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