A new form of macrothrombocytopenia induced by a germ-line mutation in the PRKACG gene

Vladimir T Manchev, Morgane Hilpert, Eliane Berrou, Ziane Elaib, Achille Aouba, Siham Boukour, Sylvie Souquere, Gerard Pierron, Philippe Rameau, Robert Keith Andrews, Francois Lanza, Regis Bobe, William P Vainchenker, Jean Phillppe Rosa, Marijke C Bryckaert, Najet Debili, Remi Favier, Hana Raslova

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43 Citations (Scopus)

Abstract

Macrothrombocytopenias are the most important subgroup of inherited thrombocytopenias. This subgroup is particularly heterogeneous because the affected genes are involved in various functions such as cell signaling, cytoskeleton organization, and gene expression. Herein we describe the clinical and hematological features of a consanguineous family with a severe autosomal recessive macrothrombocytopenia associated with a thrombocytopathy inducing a bleeding tendency in the homozygous mutated patients. Platelet activation and cytoskeleton reorganization were impaired in these homozygous patients. Exome sequencing identified a c.222C>G mutation (missense p.74Ile>Met) in PRKACG, a gene encoding the ?-catalytic subunit of the cyclic adenosine monophosphate-dependent protein kinase, the mutated allele cosegregating with the macrothrombocytopenia. We demonstrate that the p.74Ile>Met PRKACG mutation is associated with a marked defect in proplatelet formation and a low level in filamin A in megakaryocytes (MKs). The defect in proplatelet formation was rescued in vitro by lentiviral vector-mediated overexpression of wild-type PRKACG in patien tMKs. We thus conclude that PRKACG is a new central actor in platelet biogenesis and a new gene involved in inherited thrombocytopenia with giant platelets associated with a thrombocytopathy.
Original languageEnglish
Pages (from-to)2554 - 2563
Number of pages10
JournalBlood
Volume124
Issue number16
DOIs
Publication statusPublished - 2014

Cite this

Manchev, V. T., Hilpert, M., Berrou, E., Elaib, Z., Aouba, A., Boukour, S., Souquere, S., Pierron, G., Rameau, P., Andrews, R. K., Lanza, F., Bobe, R., Vainchenker, W. P., Rosa, J. P., Bryckaert, M. C., Debili, N., Favier, R., & Raslova, H. (2014). A new form of macrothrombocytopenia induced by a germ-line mutation in the PRKACG gene. Blood, 124(16), 2554 - 2563. https://doi.org/10.1182/blood-2014-01-551820